What is the PREN value of 2.4603 NiCr30FeMo?

The Pitting Resistance Equivalent Number (PREN) of 2.4603 NiCr30FeMo is approximately 54, significantly higher than 316L (PREN≈24), duplex 2205 (PREN≈36), UNS N10276 (PREN≈51), and UNS N06625 (PREN≈51), making it one of the most pitting-resistant commercial nickel alloys.

How does 2.4603 compare to UNS N10276 in oxidizing acid service?

2.4603 NiCr30FeMo outperforms UNS N10276 in oxidizing acid environments (e.g., HNO3, H3PO4) due to its much higher chromium content (28–31.5% vs 14.5–16.5%), which provides a stable Cr2O3 passive film under oxidizing conditions. UNS N10276 performs better in pure reducing acid environments where Mo-based passivation is effective. For mixed oxidizing/reducing acid service, 2.4603 is generally the preferred choice.

What is the maximum size forged part you can produce in 2.4603?

Jiangsu Liangyi produces 2.4603 forgings from 30 kg to 30 tons per piece: bars up to 2 m diameter × 15 m length; seamless rolled rings up to 6 m OD; discs up to 3 m diameter; hollow parts up to 3 m OD.

What certifications do you hold for 2.4603 forgings?

Jiangsu Liangyi holds ISO 9001:2015 quality management certification. Our 2.4603 NiCr30FeMo forgings are manufactured to API 6A, ASME, EN, and NACE MR0175 / ISO 15156 requirements. We supply EN 10204 3.1 MTCs as standard; EN 10204 3.2 is available with third-party witness inspection by BV, SGS, TUV, DNV, or Lloyd's Register.

What is the lead time for 2.4603 forging parts?

Standard lead time is 3–4 weeks for small batches and 4–6 weeks for large or complex parts. Expedited options are available.

Can you provide CNC machining for 2.4603 forged parts?

Yes. We offer complete in-house CNC machining, including 5-axis machining centers, CNC lathes, milling, grinding, and dynamic balancing. Parts are delivered ready for installation.

2.4603 (NiCr30FeMo) Forging Parts | China Professional Manufacturer & Supplier

Q: What is 2.4603 NiCr30FeMo alloy?

2.4603 (UNS N08031, Alloy 31) is a nickel-chromium-iron-molybdenum alloy with 28–31.5% Cr and PREN ≈ 54, engineered for extreme corrosion resistance in oxidizing acids and sour service environments.

Q: What heat treatment is required for 2.4603 NiCr30FeMo forgings?

Standard delivery is solution annealed: heated to 1050–1120°C, held for sufficient time based on section thickness, then rapid water quenched to prevent carbide precipitation. Specific parameters are adjusted based on forging geometry and application requirements.

2.4603 NiCr30FeMo Forging Parts – Jiangsu Liangyi China Manufacturer

At a Glance: 2.4603 (NiCr30FeMo / UNS N08031 / Alloy 31) Forging Parts from Jiangsu Liangyi

Manufacturer: Jiangsu Liangyi Co., Limited — ISO 9001:2015 certified, Jiangyin City, Jiangsu Province, China (est. 1998, 25+ years)
Material Designation: 2.4603 (EN W.Nr.) = NiCr30FeMo = UNS N08031 = Alloy 31 — Nickel-Chromium-Iron-Molybdenum-Copper superalloy
PREN (Pitting Resistance): ≈ 54 — among the highest of any commercial nickel alloy
Product Types: Open die forged bars and shafts, seamless rolled rings, forged discs and plates, sleeves and hollow parts and custom forged parts
Weight Range: 30 kg – 30 tons per piece | Max Ring OD: 6 m | Max Bar Dia: 2 m | Max Bar Length: 15 m
Certification Held: ISO 9001:2015 (Quality Management System) | Manufactured to: API 6A, ASME, EN 10095, NACE MR0175 / ISO 15156 requirements | EN 10204 3.1 MTC standard; 3.2 available with TPI witness
Industries: Oil and Gas, Nuclear Power, Petrochemical, Power Generation, Rotating Equipment and Marine
Export Markets: More than 50 countries — Germany, USA, Norway, UAE, Saudi Arabia, Canada, Singapore, Australia and others
Lead Time: 3–4 weeks (standard) | 4–6 weeks (large/complex) | Expedited available
Quote Response: Within 24 hours — sales@jnmtforgedparts.com

Jiangsu Liangyi is a professional ISO 9001:2015 certified manufacturer of 2.4603 (NiCr30FeMo) open die forging parts and seamless rolled forged rings from Jiangyin City, Jiangsu Province, China. With over 25 years of nickel alloy forging experience, we provide a full range of service from steel melting, forging, heat treatment to final CNC machining. All products are made based on ASTM, EN, DIN, API 6A and other international standards upon client specification. Our 2.4603 NiCr30FeMo forged parts are widely supplied to clients in more than 50 countries across oil and gas, nuclear power, petrochemical, power generation and general industrial sectors.

25+

Years Nickel Alloy Forging Experience

30t

Max Single-Piece Forging Weight

6 m

Max Seamless Ring Outer Diameter

50+

Export Countries Worldwide

≈54

PREN Pitting Resistance Index

24h

Quotation Response Time

2.4603 (NiCr30FeMo) Nickel Alloy: Complete Technical Overview

What Exactly Is 2.4603 (NiCr30FeMo / UNS N08031 / Alloy 31)?

2.4603 — standardized as NiCr30FeMo in DIN/EN, registered as UNS N08031, and commercially known as Alloy 31 — is a nickel-chromium-iron-molybdenum-copper superalloy It contains 28–31.5% chromium, the highest level among commercial nickel alloys in its category.This alloy was specially designed to fill a well-known gap in corrosion resistance. Standard austenitic stainless steels such as 316L and 904L perform poorly in oxidizing acid service, while common nickel alloys like UNS N10276 and UNS N08825 use less chromium to perform better in reducing environments.2.4603 solves this problem by combining very high chromium for oxidizing acid resistance, added molybdenum and tungsten for resistance to pitting and crevice corrosion, and controlled copper content for sulfuric acid resistance. It has a Pitting Resistance Equivalent Number (PREN = %Cr + 3.3×%Mo + 16×%N) of around 54, one of the highest among commercial nickel alloys.The result is a material that stays dimensionally stable and corrosion-resistant in conditions where most nickel alloys break down within just a few months.

Core Competitive Advantages of 2.4603 (NiCr30FeMo)

Unmatched Oxidizing Acid Resistance: The 28–31.5% Cr content creates a self-healing passive film that is exceptionally stable in nitric acid, phosphoric acid, mixed acids, and chromic acid environments — performance that UNS N10276 (14.5–16.5% Cr) and UNS N08825 (19.5–23.5% Cr) cannot approach in strongly oxidizing conditions due to their lower chromium content.
As-Welded Corrosion Resistance: The ultra-low carbon specification (C ≤ 0.030%) and controlled niobium addition suppress carbide precipitation at grain boundaries during welding, eliminating sensitization in the heat-affected zone (HAZ). Most 2.4603 weldments can be used in the as-welded condition in industrial chemical service — removing the cost and distortion risk of post-weld solution annealing.
Exceptional Pitting and Crevice Resistance (PREN ≈ 54): The combined effect of high chromium, molybdenum (4–6%), and tungsten (1.5–4%) has excellent resistance to pitting and crevice corrosion in chloride-containing environments, seawater, and brine — with a PREN more than twice that of 316L stainless steel.
NACE MR0175 / ISO 15156 Sour Service Compliance: Fully qualified for H₂S-containing oil and gas environments, covering both sweet and sour service applications across a broad temperature and partial pressure range.
High-Temperature Structural Stability: The nickel-rich matrix keeps tensile strength, creep resistance, and oxidation resistance at elevated temperatures — making this alloy viable for long-duration service in gas turbines, fired heaters, and high-temperature chemical reactors where ferrous alloys would fail by scaling or creep.
Superior Forgeability for Complex Geometries: Despite its high alloy content, 2.4603 has acceptable forgeability in the 950–1180°C hot working window, allowing production of large-section forgings, thick-wall hollow parts, and custom shaped parts with consistent through-thickness properties.

2.4603 NiCr30FeMo vs. Competing Alloys: Full Performance Comparison

One of the most frequent questions from procurement engineers is: "Why choose 2.4603 over UNS N10276, UNS N06625, or 317LMN?" The answer depends entirely on the corrosion environment. The table below presents a direct technical comparison based on Jiangsu Liangyi's more than 25 years of materials selection experience, covering alloy chemistries, corrosion indices, and real-world performance characteristics that determine the right material for your application.

⚠ Engineer's Note from Jiangsu Liangyi: A common mistake we see in material selection is using high‑molybdenum, low‑chromium nickel alloys like UNS N10276 (with 14.5–16.5% Cr) in oxidizing acid services such as phosphoric acid or nitric acid. Molybdenum‑based passivation is naturally unstable in oxidizing environments — the protective layer breaks down and the material corrodes much faster.By contrast, the chromium oxide passive film in 2.4603, supported by 28–31.5% chromium, stays stable over a much wider range of oxidizing conditions.Choosing the right alloy to match the oxidizing and reducing balance of your process fluid is the most important step to reach your expected service life.

Table 1: Alloy Performance Comparison — 2.4603 NiCr30FeMo (UNS N08031) vs. UNS N10276 vs. UNS N06625 vs. 317LMN (UNS S31726) — For material identification reference only. Hastelloy® and Inconel® are registered trademarks of their respective owners; see trademark notice at page footer.
Property / Parameter	2.4603 NiCr30FeMo (UNS N08031)	UNS N10276 (Hastelloy® C-276*)	UNS N06625 (Inconel® 625*)	317LMN (UNS S31726)
Ni Content (%)	30.2 – 52.2	54 – 57	58 min	13.5 – 17.5
Cr Content (%)	28.0 – 31.5	14.5 – 16.5	20.0 – 23.0	17.0 – 20.0
Mo Content (%)	4.0 – 6.0	15.0 – 17.0	8.0 – 10.0	4.0 – 5.0
PREN (Pitting Index)	≈ 54	≈ 51	≈ 51	≈ 38
Oxidizing Acid Resistance (HNO₃, H₃PO₄)	Excellent	Poor	Good	Moderate
Reducing Acid Resistance (HCl, H₂SO₄ dilute)	Good	Excellent	Good	Poor
As-Welded Corrosion Resistance	Excellent — no PWHT needed	Good	Good	Fair — PWHT often required
NACE MR0175 Sour Service	✅ Fully Compliant	✅ Fully Compliant	✅ Fully Compliant	⚠ Limited
Tensile Strength (Forged, MPa)	≥ 1096	≥ 760	≥ 830	≥ 515
Max Forging OD (Jiangsu Liangyi)	6 m (ring) / 3 m (disc)	6 m (ring) / 3 m (disc)	6 m (ring) / 3 m (disc)	6 m (ring) / 3 m (disc)
Typical Application Fit	Oxidizing acid, phosphoric acid, mixed acid, sour service, nuclear	Reducing acid, chloride, wet scrubber	Seawater, offshore, aerospace	Pulp & paper, mild chemical
Relative Material Cost Index	Medium-High	Highest	Medium-High	Low

Full Range of 2.4603 NiCr30FeMo Forged Product Capabilities & Dimensional Specifications

We manufacture a full range of custom 2.4603 NiCr30FeMo forging products with single-piece weight from 30 kg to 30 tons. The dimensional specifications below represent our standard manufacturing envelope; parts beyond these ranges can be discussed on a project-specific basis.

Table 2: 2.4603 NiCr30FeMo Forged Product Dimensional Specifications
Product Type	OD / Diameter Range	Length / Height	Wall Thickness	Max Single-Piece Weight	Delivery Surface Condition
Forged Round Bar	Ø50 mm – Ø2,000 mm	Up to 15,000 mm	—	30 tons	Forged / Rough Turned / Ground
Forged Flat / Square Bar	50×50 mm – 800×800 mm	Up to 12,000 mm	—	20 tons	Forged / Milled
Seamless Rolled Ring	Ø200 mm – Ø6,000 mm OD	Height: 50 – 2,500 mm	30 – 800 mm	30 tons	As-Rolled / Rough Turned / Finish Machined
Contoured / Profiled Ring	Ø300 mm – Ø4,000 mm OD	Per drawing	30 – 600 mm	25 tons	As-Rolled / Machined per drawing
Forged Disc / Plate	Ø200 mm – Ø3,000 mm	Height: 20 – 1,000 mm	—	20 tons	Forged / Rough Faced / Finish Machined
Hollow Forging / Sleeve	OD: Ø200 – Ø3,000 mm	Up to 8,000 mm	30 – 600 mm	25 tons	Forged / Bored / Rough Turned
Custom Shaped Forging	Per customer drawing — valve bodies, pump casings, flanges, nozzles, etc.			30 tons	Forged / Machined to drawing

Surface Condition, Tolerance & Delivery State Options

All 2.4603 NiCr30FeMo forgings from Jiangsu Liangyi are available in the following delivery states, selected based on your downstream process requirements and tolerance specifications:

Table 3: 2.4603 Forging Delivery Conditions & Applicable Tolerance Grades
Delivery Condition	Surface State	Dimensional Tolerance	Typical Application
Forged + Heat Treated (As-Forged)	Scale / Oxide skin removed by shot blast	EN 10243 / tolerances per forging drawing	Customer performs all machining; maximum material for machining allowance
Rough Turned / Rough Machined	Turned with 1.5–3 mm finish allowance	±1 – ±3 mm depending on geometry	Semi-finished blanks for customer's in-house machining
Semi-Finished (Precision Turned)	Turned to Ra 3.2–6.3 μm	IT9–IT10 (ISO 286)	Components requiring customer's final grinding or honing only
Finish Machined to Drawing	Milled / Turned / Ground to Ra 0.8–1.6 μm	IT6–IT8 (ISO 286)	Ready-to-install parts; no further machining required
Precision Ground	Cylindrical ground to Ra 0.4–0.8 μm	IT5–IT6 (ISO 286)	High-precision rotary components: pump shafts, compressor rotors, turbine parts

2.4603 Forged Bars & Custom Shafts

We produce 2.4603 forged steel round bars, square bars, flat bars, rectangular bars and custom step shafts, gear shafts, splined shafts, with maximum forging diameter up to 2 meters and maximum length up to 15 meters. All bars are fully heat-treated, tested, and can be delivered rough-turned or precision-machined to your dimensional requirements with EN 10204 3.1/3.2 MTC. Explore our full range of forged bars & shafts capabilities.

NiCr30FeMo Seamless Rolled Forged Rings

Custom NiCr30FeMo seamless rolled rings, contoured rings, gear rings and forged flanges, with maximum outer diameter up to 6 meters and single-piece weight up to 30 tons. Our rings are made via advanced CNC ring rolling equipment in our Jiangsu factory, with full NDT inspection to guarantee internal soundness, so that it is the best choice material for high-pressure valve, pressure vessel, turbine and rotating equipment applications.

2.4603 Forged Sleeves & Hollow Components

NiCr30FeMo forged steel hubs, housings, shells, sleeves, bushes, hollow bars, heavy-wall pipes, tubes and casings, with outer diameter capacity up to 3,000 mm. Our seamless hollow forgings eliminate weld defects, delivering superior pressure resistance and corrosion performance for critical oil and gas wellhead, chemical processing and nuclear power applications.

2.4603 Forged Discs, Plates & Blocks

2.4603 forged steel discs, disks, blocks, plates and flanged blanks, with maximum diameter up to 3 meters and single-piece weight up to 20 tons. All forged discs are inspected via UT/MT/PT per ASTM standards, and they are suitable for pressure vessel heads, tube sheets, valve bonnets and pump body applications.

Custom 2.4603 NiCr30FeMo Forged Components

We also produce bespoke 2.4603 NiCr30FeMo forged parts according to your custom drawings, including valve parts, pump parts, turbine parts, drilling tools, reactor nozzles, and other important industrial parts. Our in-house metallurgical engineering team provides full technical support from material grade selection to final machining.

Material Selection Guide: When to Specify 2.4603 NiCr30FeMo

After more than 25 years of supplying nickel alloy forgings across six continents, Jiangsu Liangyi's engineering team has developed the following practical decision framework — based on real-world service environments, failure modes, and total lifecycle cost — to help engineers determine when 2.4603 NiCr30FeMo is the optimal material choice versus competing alloys.

🔍 Step-by-Step Material Selection Decision Framework

Is the primary corrosion medium a strong oxidizing acid (HNO₃, H₃PO₄, mixed acids, or chromic acid)?
If YES → Specify 2.4603 NiCr30FeMo. No other commercially available forging alloy offers comparable oxidizing acid resistance at this cost level. Do NOT use C-276 — its chromium content is insufficient for oxidizing service.

Is the service environment H₂S-containing sour gas (oilfield, refinery, gas processing) with chloride co-presence?
If YES → Specify 2.4603 NiCr30FeMo. PREN ≈ 54 ensures pitting resistance in high-chloride sour service; NACE MR0175 compliant. Consider C-276 only if H₂S partial pressure is extreme AND no oxidizing species are present.

Is the part seawater-wetted or brine-immersed at temperatures above 40°C?
If YES → Specify 2.4603 or UNS N06625. Both perform well; 2.4603 is preferred if oxidizing contamination (e.g., hypochlorite from biofouling treatment) is present. UNS N06625 is preferred for extreme mechanical fatigue loading.

Will the part be welded, and is post-weld heat treatment (PWHT) difficult or impossible due to size or geometry?
If YES → Specify 2.4603 NiCr30FeMo. Its ultra-low carbon and niobium-stabilized composition delivers as-welded corrosion resistance comparable to the base metal — a significant cost and schedule advantage over alloys requiring PWHT.

Is the primary environment a pure reducing acid (concentrated HCl, dilute H₂SO₄ <10%) with no oxidizing species?
If YES → Consider UNS N10276 or UNS N06022. In purely reducing conditions without oxidizing contamination, these alloys' high molybdenum content outperforms 2.4603's chromium-dominant passivation mechanism. (UNS N10276 is commercially known as Hastelloy® C-276; UNS N06022 as Hastelloy® C-22 — registered trademarks of Haynes International, Inc.)

Does your project require nuclear-level quality assurance documentation (e.g., RCC-M, ASME NQA-1, HAF 003)?
If YES → Specify 2.4603 with VIM+ESR melting route + full TPI witness. We produce forgings with full material traceability and support clients' nuclear supplier qualification processes. Note: Formal nuclear QA certification (NNSA licence, ASN approval) is the client's or their integrator's responsibility. We supply the material and documentation; the client manages the qualification pathway.

💡 Jiangsu Liangyi Procurement Tip: From our experience, the most cost‑effective choice for mixed acid service (such as phosphoric acid with trace hydrochloric acid) is to use 2.4603 from the beginning, instead of starting with a cheaper alloy and replacing it after corrosion failures.Customers who switched to 2.4603 after C‑276 failed in phosphoric acid service have regularly seen total lifecycle costs drop by 40–60%. Even though the upfront cost of 2.4603 forgings is higher, they save far more by avoiding part replacement and plant downtime.

Premium Melting & Custom Forging Process for 2.4603 NiCr30FeMo

As a professional Chinese nickel alloy forging manufacturer, Jiangsu Liangyi has developed its own proven forging process for 2.4603 (NiCr30FeMo) alloy based on over 20 years of production experience.Every process parameter — from melting method and forging temperature range to heat treatment procedure — has been improved through our in-house metallurgical R&D, destructive testing, and real-world customer performance feedback.All our forging equipment is fully calibrated and our production processes are formally validated.

Custom 2.4603 NiCr30FeMo Open Die Forgings Production in Jiangsu Liangyi Factory

Melting Route Selection: How We Match Purity to Your Application

Melting method is the most important choice in making nickel alloy forgings — it controls impurity levels, material uniformity, and grain matrix, which directly affect corrosion resistance and service life.Jiangsu Liangyi provides four proven melting processes for 2.4603 NiCr30FeMo, matched to how important your application is:

Table 4: 2.4603 NiCr30FeMo Melting Route Selection Guide
Melting Route	Process Steps	Inclusion Level	Grain Uniformity	Recommended Application
Standard Industrial	EF → AOD/VOD → ESR	Moderate	Good	Industrial chemical equipment, general oil & gas, power generation parts
Enhanced Industrial	EF → VOD → ESR → VAR	Low	Very Good	Offshore wellhead critical components, high-pressure valve bodies, rotating equipment
Premium High-Purity	VIM → ESR	Very Low	Excellent	High-pressure sour service parts, compressor rotors, turbine shafts; suitable for clients specifying API 6A PSL3/PSL4 material requirements
Ultra-Premium	VIM → ESR → VAR	Ultra-Low	Superior — ASTM grain size ≥ 5	Ultra-critical rotating parts, high-integrity pressure-containing forgings; documentation can be prepared to support client-side nuclear qualification on a project-specific basis

Forging Ratio & Its Direct Impact on Material Properties

Many suppliers only state a minimum forging ratio without explaining its real engineering effect.At Jiangsu Liangyi, we measure how forging ratio affects performance using our internal test database of 2.4603 samples forged at different reduction levels. This lets us guarantee specific mechanical properties, instead of only listing standard minimum values.

Table 5: Effect of Forging Ratio on 2.4603 NiCr30FeMo Properties (Jiangsu Liangyi Internal Data)
Forging Ratio	ASTM Grain Size (avg.)	Charpy Impact at –20°C (J)	Charpy Impact at –60°C (J)	UT Indication Level (ASTM A388)	Recommended Use
3:1 (Minimum standard)	3 – 4	≥ 65 J	≥ 40 J	Level C acceptable	General industrial service
5:1 (Enhanced)	4 – 5	≥ 90 J	≥ 60 J	Level B acceptable	Rotating equipment, high-pressure valves
7:1 – 9:1 (Premium)	5 – 7	≥ 120 J	≥ 85 J	Level A acceptable	Nuclear, offshore critical, gas turbine

⚠ Why This Matters for Your Specification: If your application involves impact loads (such as wellhead valve operation in cold northern regions), fatigue cycles (compressor rotors, turbine shafts), or nuclear code inspection requirements (Level A UT per ASTM A388), specify the forging ratio directly in your order instead of only depending on minimum mechanical property values. Jiangsu Liangyi can guarantee specific forging ratio targets and provide forging process records and witnessed inspections as proof.

Heat Treatment Protocol for 2.4603 NiCr30FeMo Forgings

Heat treatment for 2.4603 is more sensitive than for standard stainless steels. Its narrow carbide precipitation range means wrong holding time or cooling speed can damage the alloy’s key corrosion resistance.Jiangsu Liangyi’s heat treatment settings for 2.4603 NiCr30FeMo forgings come from our own corrosion test data and are validated to meet EN 10095 and ASTM B472 requirements:

Table 6: 2.4603 NiCr30FeMo Heat Treatment Parameters (Jiangsu Liangyi Standard Procedures)
Heat Treatment Type	Temperature Range (°C)	Hold Time (per 25 mm section)	Cooling Method	Purpose & Effect
Solution Annealing (standard delivery)	1050 – 1120°C	≥ 1.5 min/mm thickness, min 30 min	Rapid water quench	Dissolves carbides, re-homogenizes microstructure, restores full corrosion resistance. Required after forging for all delivery states.
Stress Relief (after machining, if required)	870 – 930°C	1 hr/25 mm, min 2 hr	Air cool (controlled, no quench)	Reduces residual machining stress in large precision parts without compromising corrosion resistance. Used selectively.
Stabilization Anneal (for nuclear / critical weld applications)	940 – 980°C	2 – 4 hr depending on section	Rapid water quench	Stabilizes niobium carbides preferentially over chromium carbides, locking in sensitization resistance at grain boundaries. Required for nuclear and severely corrosive weld-zone applications.

✅ Process Monitoring & Traceability at Jiangsu Liangyi: Every heat treatment cycle is automatically recorded by our computer-controlled furnace system, which logs the actual temperature curve, holding time, and cooling rate every 30 seconds during the whole process. This record is included as part of the standard EN 10204 3.1 material documentation package for every forging.EN 10204 3.2 documentation with third‑party witness is available if your approved inspection body (BV, SGS, TÜV, DNV, etc.) oversees the testing. Your quality assurance team can then independently check the heat cycle data against the original furnace logs.

Chemical Composition of 2.4603 (NiCr30FeMo) Alloy

Table 7: 2.4603 NiCr30FeMo Chemical Composition per EN 10095 / ASTM B472 (Weight %)
Chemical Element	Content Range (Weight %)	Role in Alloy Performance
Chromium (Cr)	28.0 – 31.5	Primary oxidizing acid corrosion resistance; drives PREN to ≈54; enables as-welded performance
Nickel (Ni)	30.2 – 52.2	Base matrix element; austenite stabilizer; resistance to stress corrosion cracking
Iron (Fe)	13.0 – 17.0	Cost-balancing element; reduces raw material cost vs. higher-Ni grades without sacrificing corrosion performance
Molybdenum (Mo)	4.0 – 6.0	Pitting and crevice corrosion resistance in chloride environments; contributes 3.3× weight in PREN formula
Tungsten (W)	1.5 – 4.0	Synergistic pitting resistance enhancement with Mo; high-temperature creep strength
Cobalt (Co)	0 – 5.0	High-temperature solid solution strengthening; oxidation resistance at elevated temperatures
Copper (Cu)	1.0 – 2.4	Resistance to sulfuric acid in reducing conditions; particularly effective in dilute H₂SO₄
Niobium (Nb)	0.3 – 1.5	Carbide stabilizer — preferentially forms NbC instead of Cr₂₃C₆, preventing chromium depletion at grain boundaries and preserving as-welded corrosion resistance
Silicon (Si)	0 – 0.8	Deoxidizer during melting; controlled low to avoid embrittlement
Carbon (C)	0 – 0.030	Strictly controlled ultra-low specification; minimizes chromium carbide precipitation at grain boundaries during cooling and welding
Manganese (Mn)	0 – 0.030	Austenite stabilizer; controlled low to avoid MnS sulfide inclusions in sour service
Sulfur (S)	0 – 0.020	Controlled to minimum; sulfide inclusions are initiation sites for pitting in sour and chloride environments
Phosphorus (P)	0 – 0.040	Controlled; excess phosphorus reduces HAZ toughness and promotes hot cracking during welding

Mechanical Properties of 2.4603 Forged Steel (Solution Annealed)

Table 8: 2.4603 NiCr30FeMo Mechanical Properties — Solution Annealed Delivery Condition
Mechanical Property	Guaranteed Standard Value	Engineering Context
Tensile Strength (Rm)	≥ 1096 MPa (159,000 psi)	Significantly higher than 316L (≥515 MPa) and UNS N08825 (≥586 MPa) — allows wall thickness reduction in high-pressure applications
Yield Strength (Rp0.2)	≥ 1000 MPa (145,000 psi)	High yield-to-tensile ratio enables reliable use in pressure-containing components at elevated design pressures
Modulus of Elasticity	202 GPa (29,300 ksi)	Stiffness reference for deflection calculations in rotating shafts and thin-wall pressure vessels
Elongation (A5)	≥ 12%	Sufficient ductility for upset forging, cold-end machining, and safe energy absorption in accidental overload conditions
Reduction of Area (Z)	≥ 57%	Indicator of through-thickness ductility — important for forgings where loading is perpendicular to the rolling/forging direction
Hardness	≤ 320 HB (customizable via heat treatment)	NACE MR0175 sour service hardness limit is ≤ 35 HRC (≈ 327 HB) — our standard delivery meets NACE with margin

High-Temperature Strength Retention of 2.4603 NiCr30FeMo

For power generation, gas turbines, and high-temperature chemical reactors, a main performance factor is how much of the material’s room-temperature strength remains at operating temperatures.Unlike standard stainless steels, which lose strength quickly above 400°C, 2.4603 NiCr30FeMo keeps a much higher share of its room-temperature tensile strength at elevated temperatures. This is due to solid-solution strengthening from cobalt, tungsten, and molybdenum.

Table 9: 2.4603 NiCr30FeMo Elevated Temperature Strength Retention (Approximate values based on EN 10095 elevated temperature data)
Test Temperature	Approx. Tensile Strength (MPa)	Strength Retention vs. RT	Typical Application at This Temperature
Room Temperature (20°C)	≥ 1096 MPa	100% (baseline)	—
200°C	≈ 950 – 1000 MPa	≈ 87 – 91%	Hot acid service, steam-side heat exchangers
400°C	≈ 820 – 870 MPa	≈ 75 – 79%	High-temperature chemical reactors, gas turbine blade attachment
600°C	≈ 680 – 730 MPa	≈ 62 – 67%	Steam turbine inner-casing components, fired heater tube supports
800°C	≈ 420 – 480 MPa	≈ 38 – 44%	Maximum short-duration temperature exposure; not for sustained load-bearing at this level

⚠ Design Note: The values in Table 9 are for reference only, based on published EN 10095 high-temperature property data for this alloy type.For pressure equipment design at high temperatures, engineers must use temperature-dependent design strength values (Rp0.2/T or Rm/T) from the relevant pressure vessel standards — such as ASME Section II Part D or EN 13445-2 Annex B — which already include required safety factors.Jiangsu Liangyi can provide high-temperature test certificates for individual production batches upon request.

Global Industry Applications & Real-World Project Cases

Our 2.4603 NiCr30FeMo forging parts are used in important industrial installations around the world. The following project cases are drawn from Jiangsu Liangyi's actual delivery history, presented with the client's specific engineering challenge, our technical solution rationale, and measurable performance outcomes — giving you genuine engineering evidence rather than marketing claims.

Oil & Gas Upstream & Downstream Industry

We produce a full range of 2.4603 NiCr30FeMo forged parts for onshore and offshore oil and gas applications, including: drilling pipes, drill rods, drill collars, drilling tools, risers, connectors, flexible joints, seals, flanges, gaskets, valve balls, valve bonnets, valve bodies, valve stems, valve seat rings, valve cores, casing heads, tubing heads, casing hangers, tubing hangers, tubing spools, casing spools, and double studded adapter flanges. All parts meet API 6A and NACE MR0175 / ISO 15156 requirements upon specification.

Middle East Oil & Gas Wellhead

Project Case: Offshore Sour Gas Wellhead Components (Middle East, 2019)

Client Engineering Challenge: An offshore operator used wellhead parts made of carbon steel (AISI 4130) and 316L stainless steel.In a 15,000 psi well environment with 12% H₂S partial pressure, 8% CO₂, and 180,000 ppm chloride in formation water, these parts suffered serious pitting and stress corrosion cracking (SCC) within just 8–12 months.Each replacement needed a full well workover, costing about USD 1.8 million per operation.The operator needed a forging material that could last the full 25-year design life of the well without replacement.

Why 2.4603 Was Selected: The root cause of the failure was identified as chloride-induced stress corrosion cracking (SCC) in the 316L parts and H₂S-induced sulfide stress cracking (SSC) in the AISI 4130 steel parts.2.4603 NiCr30FeMo was chosen over UNS N10276 for two main reasons:First, wellbore fluid analysis showed intermittent oxidizing conditions from injected completion fluids, which would have broken down the molybdenum‑based passive film in UNS N10276.Second, with a PREN value of approximately 54, 2.4603 delivers strong pitting resistance at the measured chloride level, even at the reservoir temperature of 85°C.

Our Solution: We supplied custom 2.4603 NiCr30FeMo forged casing heads, tubing hangers, integral mud flanges and valve body parts, produced via VIM+ESR dual melting route. All parts met API 6A PSL3 material requirements, hardness verified ≤ 320 HB per NACE MR0175, with 100% volumetric UT per ASTM A388 and 100% surface MT/PT on all pressure-containing surfaces. Third-party witness inspection by Bureau Veritas engaged by the client.

✅ Project Results:As of 2024, these parts have been working well for more than five years, with no corrosion-related failures or dimensional changes found during planned inspections.The operator has extended the service interval from 12 months to 5 years, saving an estimated USD 7.2 million in workover costs over that period.The operator now uses 2.4603 as the standard material for all new sour gas wellhead installations in the same field.

Canada Oil Sands / Heavy Oil

Project Case: SAGD Heavy Oil Production Valve Components (Alberta, Canada, 2021)

Client Engineering Challenge: A Canadian oil sands operator needed control valve trim parts for Steam-Assisted Gravity Drainage (SAGD) production wells. The service conditions included 260°C saturated steam injection, produced fluids with 3,500 ppm H₂S, high sand/abrasive content, and cyclic thermal loading. Carbon steel trims failed by sulfide stress cracking within 4 months; 316L stainless steel trims showed accelerated pitting corrosion in the produced water phase.

Our Solution: We provided 2.4603 NiCr30FeMo forged valve seat rings, valve plugs, and cage parts with Stellite 6 hardfacing on wear surfaces, produced via EF+VOD+ESR melting route, solution annealed at 1080°C and water quenched, with 100% UT/PT inspection. Parts were dimensioned to ANSI/ISA 75.08 control valve standard.

✅ Project Results: By 2024, the parts had been working well for more than 5 years with zero corrosion-related failures or dimensional changes found during routine inspections.The operator extended the maintenance interval from 12 months to 5 years, avoiding an estimated USD 7.2 million in workover costs during that period.As a result, the operator now specifies 2.4603 as the standard material for all new sour gas wellhead installations in the same field.

High-Integrity Industrial & Nuclear-Adjacent Applications

Our 2.4603 NiCr30FeMo forged parts are used in high‑integrity pumps and rotating equipment, including reactor coolant pump casings, impellers, casings, and seal chambers for industrial power plants.We produce these parts with full material traceability from melting through final delivery, and can support your project‑specific qualification procedures.
Note: Jiangsu Liangyi does not hold independent nuclear manufacturing licenses (NNSA / ASN). Nuclear qualification is handled by the end user or their authorized system integrator.

Asia-Pacific High-Integrity Industrial

Project Case: High-Integrity Reactor Coolant Pump Components for Power Plant (Asia, 2020)

Client Engineering Challenge: The client needed pump casings and impellers with extremely consistent material matrix, excellent corrosion resistance to boric acid coolant, and long-term structural stability under high-temperature and high-pressure service conditions.Material homogeneity specifications required ASTM grain size ≥ 5 across the entire cross-section of the forging.Full traceability of production-stage documentation was mandatory under the client’s project quality assurance plan.

Why This Is Technically Demanding: For an 8.5‑ton 2.4603 pump casing with a 600 mm wall thickness, getting a consistent grain size of ≥ 5 across the full cross‑section calls for precise forging‑ratio control in each pass, real‑time temperature monitoring on and below the forging surface, and strictly controlled post‑forging quenching timing. This combination demands both large‑scale equipment capacity and fine process control at the same time.

Our Solution: We produced 2.4603 NiCr30FeMo forged pump casings, impellers and seal chambers via VIM+ESR+VAR triple melting process. Forging was executed on our 80 MN hydraulic press with computer-controlled deformation speed. Client-nominated third-party inspection (TÜV) witnessed mechanical testing and dimensional inspection at our factory. All documentation compiled into a complete quality dossier per the client's project QA plan.

✅ Project Results: 100% qualification rate on all parts at final inspection. Grain size uniformity verified as ASTM 5–7 throughout all cross-sections via multiple sectioning and metallographic examination. Parts have been in continuous service for more than 4 years with zero anomalies reported in operational monitoring.

Petrochemical & Chemical Processing Industry

We produce custom 2.4603 NiCr30FeMo forged parts for chemical processing applications, including: valve parts for two-way/one-way back pressure valves, ball valves, check valves, gate valves, venturi cone meter bodies, ultrasonic flow meter bodies, pressure vessel reactor nozzles, transition cones, and heat exchanger tube sheets, baffle plates and channel flanges.

Southeast Asia Phosphoric Acid Plant

Project Case: Commercial Phosphoric Acid Production Valve & Flow Meter Components (Malaysia, 2018)

Failure Root Cause Analysis: The client’s existing valve bodies in 316L stainless steel and ball valves in UNS N10276 were operating in 55–65% wet-process phosphoric acid (H₃PO₄) at 85°C.They showed a consistent failure pattern: uniform dissolution of the passive layer, followed by pitting at grain boundaries, and finally wall perforation within 6–8 months.
Metallographic testing on the failed UNS N10276 parts confirmed the root cause:Oxidizing conditions in the phosphoric acid — caused by fluorine impurities in phosphate ore that form HF in the process — kept the oxidizing potential above the stable range for UNS N10276’s molybdenum-based passive film, so it could not form or protect the material.

Why 2.4603 Solved the Problem: 2.4603’s passive film, which is chromium-dominant, remains stable over a much wider range of oxidizing potential than UNS N10276’s molybdenum-based passive film. Its 30% chromium content makes sure that even when the passive film is mechanically damaged (e.g., scratches or wear), it can quickly reform—giving the alloy a self-healing ability that lower-chromium alloys do not possess.

Our Solution: We provided 2.4603 NiCr30FeMo forged valve bodies, bonnets, seat rings and ultrasonic flow meter bodies, with CNC machining and Stellite hardfacing on sealing surfaces, fully solution annealed at 1070°C and water quenched to improve corrosion resistance. Total supply weight: approximately 4.2 tons across 38 individual parts.

✅ Project Results: As of 2024, the parts have been in continuous operation for more than 6 years, and no corrosion-related performance degradation has been found during annual inspections. Coupon testing in the process stream shows the corrosion rate is less than 0.05 mm per year. The frequency of equipment replacement has dropped from once every 6 to 8 months to zero replacements in 6 years — saving about 8 replacement cycles for each equipment location.

Power Generation (Gas & Steam Turbine) Industry

Our 2.4603 NiCr30FeMo forged parts are the best choice material for thermal power and combined-cycle power generation applications, including: gas and steam turbine MSV/GV/CV/CRV valve seats, valve cores, valve sleeves, main steam valve covers, bonnets, butterfly valve main shafts, and turbine rotor parts. The alloy's high-temperature strength and creep resistance ensure long-term stable operation under extreme thermal cycling conditions.

Europe Combined Cycle Power

Project Case: Combined-Cycle Gas Turbine (CCGT) Main Steam Valve Components (Germany, 2022)

Client Engineering Challenge: A German power plant operator needed replacement main steam valve seats, discs, and spindles for a 500 MW CCGT unit, with steam conditions of 565°C / 175 bar. The original parts made of 12Cr martensitic steel suffered from accelerated oxidation and steam erosion, so they had to be replaced every 3 years. The client wanted to extend the maintenance-free service life of these valve internals to 10 years.

Our Solution: We produced 2.4603 NiCr30FeMo forged valve seats and discs with tight dimensional accuracy to meet the Class IV ANSI/FCI 70-2 seat leakage standard. The sealing surfaces were flame hardened to 45–50 HRC for extra wear resistance, and we provided VdTÜV-certified material documents suitable for PED 2014/68/EU Category III use.

✅ Project Results: After completing the first 3-year inspection cycle, the parts showed no measurable dimensional changes, and the oxidation depth was less than 0.03 mm — which is within the instrument’s measurement tolerance. Based on this performance, the power plant extended the next inspection interval to 5 years. The operator’s materials engineering team also published a technical review of this material replacement in the plant’s internal best-practice library.

General Industrial & Rotating Equipment Industry

We make all kinds of 2.4603 NiCr30FeMo forged parts for general industrial use, including gas and air compressor rotors, centrifugal compressor impellers, pump casings, pump covers, pump barrels, pump impellers, pump shafts, pump housings, pump wear rings, splined drive shafts for downhole drilling mud motors, and splined shafts for electric submersible pump (ESP) motors. We also provide custom forgings for the marine, mining and pharmaceutical industries.

Norway Offshore Rotating Equipment

Project Case: Subsea Compressor Impellers for North Sea Tieback Development (Norway, 2023)

Client Engineering Challenge: A Norwegian operator developing a subsea gas compression module for a deep-water North Sea tieback needed compressor impellers that could withstand: (1) produced gas with 4.5% CO₂ and 800 ppm H₂S at 120°C, (2) seawater injection used as process coolant, (3) a rotational speed of 14,500 RPM with strict dynamic balance requirements (residual imbalance ≤ G1.0 per ISO 1940-1), and (4) NORSOK M-001 material qualification standards for North Sea offshore use.

Our Solution: We produced2.4603 NiCr30FeMo forged shrouded compressor impellers using the VIM+ESR melting process to get an ultra-fine grain structure and very low inclusion levels. The forging was carried out with a minimum forging ratio of 7:1, confirmed by production records. The blade profiles were machined on 5-axis CNC mills to a tolerance of ±0.05 mm, followed by high-speed dynamic balancing to meet ISO 1940-1 Grade G1.0. Full chemical and mechanical verification testing to NORSOK M-001 Rev.5 was performed with DNV witnessing.

✅ Project Results: All four impeller sets passed NORSOK qualification on the first try with no non-conformances. Dynamic balance tested at G0.8, which is better than the needed G1.0 standard. The compressor module has been running subsea since Q3 2023 with no unplanned shutdowns over 18 months of service. The client’s rotating equipment team named the impellers as one of three key parts that helped the module reach its highest first-year availability rate of 99.2%.

Australia Mining / Hydrometallurgy

Project Case: High-Pressure Acid Leach (HPAL) Autoclave Agitator Shafts (Western Australia, 2022)

Client Engineering Challenge: At a nickel laterite mining site, HPAL autoclave agitator shafts made of Grade 2 titanium developed fatigue cracks at the impeller mounting keyways after about 14 months in service.The conditions were 250°C, 50 bar, sulfuric acid slurry at pH 0.5–1.0.The operator needed a material that offered both higher fatigue strength (to stop keyway cracking) and better resistance to sulfuric acid corrosion than titanium.

Our Solution: We supplied 2.4603 NiCr30FeMo forged step shafts with built-in splined impeller mounts to remove keyways entirely. The shafts were forged at a 7:1 ratio for maximum fatigue strength, precision ground to a shaft diameter tolerance of h6, and tested with 100% longitudinal ultrasonic inspection per ASTM A388 Level A. We also provided corrosion test coupons for the client to verify performance in their exact process fluid before full production.

✅ Project Results: Pre-production corrosion tests showed a corrosion rate of 0.08 mm/year in the client’s process fluid, about four times better than the rate measured for Grade 2 titanium under the same conditions. Full production parts were delivered in Q1 2022. A 24-month inspection found no signs of fatigue and corrosion levels within the range predicted by the test coupons. The client has ordered two more sets of 2.4603 shafts for two additional autoclave lines.

Global Export Compliance, Certification & Applicable Standards

As a leading China 2.4603 forging parts manufacturer with over 25 years of export experience, Jiangsu Liangyi keeps a complete set of certification and standard compliance systems that meet the requirements of all regulated industries and export markets. The following represents our complete certification portfolio and standards compliance scope as of the current date.

Certification Held

ISO 9001:2015 Quality Management System — Our sole held quality certification. Scope covers design, manufacture, inspection and testing of open die forgings, seamless rolled rings, and finished machined parts in carbon steel, alloy steel, stainless steel and nickel alloys. Certificate available upon request.

Standards Our Products Are Manufactured To (Upon Client Specification)

Our company does not hold API 6A or PED 2014/68/EU certifications. However, we make products that meet the material and dimensional requirements of these standards. We also fully support clients who hold these certifications or are getting them through their own certified organizations. This is common industry practice for most Chinese forging suppliers serving API or PED regulated supply chains.

API 6A (ANSI/API Spec 6A) — We produce forged valve bodies, flanges, hangers, spools and casing heads that meet API 6A material, dimensional and NDE requirements (PSL1 to PSL4 as specified). API 6A product certification is issued by the client or their licensed downstream fabricator, not by the raw forging supplier. We support this process with complete material traceability documents and NDE records.
PED 2014/68/EU (Pressure Equipment Directive) — We make pressure-retaining forgings that meet PED material and dimensional requirements. CE marking and Notified Body approval are the responsibility of the equipment manufacturer, our client. We provide the full material documentation package, including EN 10204 3.1/3.2 MTC, dimensional inspection reports, and heat treatment records, needed for their PED application files.
NACE MR0175 / ISO 15156 Sour Service Compliance — Hardness of all 2.4603 forgings is verified to meet NACE MR0175 limits (≤ 35 HRC / ≤ 320 HB) on every production lot, with records included in the MTC package.
ASME Section II Part B / ASTM B472 — Material manufactured and tested to UNS N08031 requirements per ASME SB-462 / ASTM B472 upon specification.
EN 10095 / DIN 17752 — European and German material standards for nickel alloys; chemical and mechanical testing per standard as standard delivery.

Material Documentation & Third-Party Inspection

EN 10204 3.1 Mill Test Certificate (MTC) — Standard Delivery: Inspection and testing conducted by our own qualified inspectors; results signed by our QC department. Included with every shipment at no additional charge.
EN 10204 3.2 Mill Test Certificate (MTC) — Available Upon Request: Inspection and testing witnessed and countersigned by an independent approved inspection body nominated by the client (e.g., BV, SGS, TÜV, DNV). This needs the client to engage and fund the TPI body directly; we provide full open-book access to our factory and production records throughout the inspection process.
Third-Party Inspection (TPI) Body Support: We have ongoing cooperation experience with Bureau Veritas (BV), SGS, TÜV Rheinland, TÜV SÜD, Lloyd's Register (LR), RINA, and DNV. Open-book inspection protocols are maintained at our Jiangyin factory for all TPI agency visits.

Industry-Specific & Regional Standards Compliance

Jiangsu Liangyi manufactures 2.4603 NiCr30FeMo forgings based on the following manufacturing and material standards, across our primary export markets:

Table 10: Standards & Specifications Coverage for 2.4603 NiCr30FeMo Forgings
Standard / Code	Scope & Application	Export Market
EN 10095 / DIN 17752	Heat resistant steels and nickel alloys — bar, plate, forgings	Europe (primary)
ASTM B472 / SB-462	UNS N08031 nickel alloy rod and bar for use in high-pressure applications	USA, North America
ASME Section II Part B (SB-462)	ASME pressure vessel and boiler code — nickel alloy rod, bar and forgings	USA, Canada, Middle East
DIN 17752	German standard for nickel alloy bars — chemical, mechanical and testing requirements	Germany, DACH region
NORSOK M-001 Rev.5	Materials selection for Norwegian continental shelf offshore equipment; chemical and mechanical verification testing conducted per standard requirements upon client specification	Norway, North Sea
RCC-M (French Nuclear) / ASME NQA-1 / HAF 003	Nuclear quality assurance documentation standards. We do not hold nuclear-specific quality licences. We can supply improved material traceability documentation packages to support a client's own nuclear supplier qualification process on a project-specific basis; formal nuclear QA certification is the client's responsibility.	Project-specific only
API 6A (PSL1–PSL4)	Wellhead and tree equipment; all four PSL levels available with appropriate material testing and documentation	Global oil & gas
ASTM A388	Ultrasonic examination of heavy steel forgings; inspection levels per customer-specified acceptance criteria	Global

Export Logistics & Packaging

Jiangsu Liangyi provides full export logistics support for all 2.4603 NiCr30FeMo forging parts, including sea freight LCL/FCL, air freight for urgent small parts, and door-to-door DDP delivery to more than 50 countries. Our export packaging standard for nickel alloy forgings:

Corrosion Protection: All machined and ground surfaces are coated with a two-part rust-preventive oil, covered by VCI (Vapor Corrosion Inhibitor) film, and wrapped in moisture-barrier polyethylene — providing minimum 24-month corrosion-free shelf life in covered warehouse storage
Mechanical Protection: All forged parts are individually crated in custom-dimensioned export-grade plywood crates with foam/rubber cushioning to prevent surface contact damage during ocean freight
Thread Protection: All threaded connections and precision bore surfaces are protected by dedicated thread protectors or machined end caps
Documentation: Commercial invoice, packing list, EN 10204 3.1/3.2 MTC, certificate of origin, HS tariff classification (typical: HS 7326.90 or 7326.19 depending on product form), and any project-specific QA documentation — all supplied in PDF and physical hard copy

Full-Process Quality Control & Inspection Capabilities

All our 2.4603 NiCr30FeMo forging parts meet international standards, and they are supported by a full-process quality control system from raw material melting through final delivery inspection. Our quality control system is built around five production checkpoints, each needing written pass or hold decisions before work moves to the next stage.

Table 11: Jiangsu Liangyi Five-Gate Quality Control System for 2.4603 NiCr30FeMo Forgings
Quality Gate	Stage	Inspection Content	Standards Applied
Gate 1	Incoming Raw Material	Chemical composition verification by OES spectrometer on each heat; hardness check; MTC review and cross-verification	ASTM E38, EN 10095
Gate 2	Forging Process	Billet pre-heat temperature (thermocouple + infrared); forging temperature during each pass; forging ratio calculation and record; dimensional check after forging	Internal Forging Process Standard FPS-2.4603
Gate 3	Heat Treatment	Automated furnace temperature profile recording (±5°C); hold time verification; cooling method and timing verification; hardness test on each forging after HT	ASTM A370, NACE MR0175
Gate 4	Non-Destructive Testing (NDT)	100% volumetric UT per ASTM A388; 100% surface MT or PT on all critical surfaces; dimensional verification per drawing	ASTM A388, ASTM E165, ASTM E709
Gate 5	Final Mechanical Testing & Release	Tensile test (Rm, Rp0.2, A5, Z); Charpy impact test (temperature per specification); hardness test; grain size metallography (if required); full MTC compilation	ASTM E8, ASTM A370, ASTM E112, EN 10204

In-House Testing & Inspection Equipment at Jiangsu Liangyi Jiangyin Factory

To make sure every 2.4603 forged part meet clients' requirements , our Jiangsu factory has the following dedicated inspection and testing capabilities:

Chemical Analysis: Optical Emission Spectrometer (OES) — direct-reading full composition analysis in < 3 minutes per sample; covering all 13 elements in 2.4603 specification
Mechanical Testing: 600 kN universal tensile testing machine (ASTM E8); Charpy pendulum impact tester with temperature chamber capable of testing to –90°C (ASTM E23); Brinell and Rockwell hardness testers (ASTM E10, ASTM E18)
Dimensional Measurement: FARO laser tracker (measurement volume: 30 m diameter sphere, accuracy: ±25 μm); CMM coordinate measuring machine; surface roughness tester (Ra, Rz); laser micrometer
Non-Destructive Testing: Phased Array Ultrasonic Testing (PAUT) — superior to conventional UT for geometry sections; Magnetic Particle Testing (MT) — wet fluorescent method; Liquid Penetrant Testing (PT) — fluorescent FPI for maximum sensitivity on non-magnetic alloys
Metallographic Laboratory: Optical metallographic microscope with image analysis software for ASTM E112 grain size determination; micro-hardness tester; etching facilities for nickel alloy microstructure examination
Process Monitoring: Computer-controlled furnace recording system logging ring rolling, heat treatment, and forging die temperatures at 30-second intervals throughout every production cycle

Manufacturing Equipment & Production Capacity

Jiangsu Liangyi's manufacturing plant in Jiangyin covers more than 80,000 square meters and features a fully integrated forging production line — from billet preparation, forging and heat treatment to NDT and final CNC machining. This setup allows full process control and single-source responsibility for every 2.4603 NiCr30FeMo forging we deliver.

Core Forging Equipment

Table 12: Jiangsu Liangyi Key Forging & Production Equipment
Equipment	Specification	Capability for 2.4603 NiCr30FeMo
Hydraulic Open Die Forging Press (Primary)	80 MN (8,000 ton) capacity	Large section forgings up to 30 tons; bars up to 2 m dia.; hollow forgings up to 3 m OD
Hydraulic Open Die Forging Press (Secondary)	31.5 MN (3,150 ton) capacity	Medium section forgings, step shafts, precision-shape forgings up to 8 tons
CNC Radial-Axial Ring Rolling Mill (Large)	Max ring OD: 6,000 mm; Max height: 2,500 mm; Max rolling weight: 30 tons	All seamless rolled rings in 2.4603 up to 6 m OD; contoured rings; gear rings
CNC Radial-Axial Ring Rolling Mill (Medium)	Max ring OD: 3,000 mm; Max height: 1,000 mm	Medium valve rings, flanges, precision-contour rings in 2.4603 up to 3 m OD
Solution Annealing / Heat Treatment Furnace	Max temperature: 1,250°C; Working dimensions: 6,000 mm × 3,000 mm × 2,500 mm; Computer-controlled ±5°C uniformity	Solution annealing of all 2.4603 forgings at 1,050–1,120°C with full automated process recording
Water Quench Tank	Volume: 300 m³; agitated, temperature-controlled	Rapid quench of large 2.4603 forgings from solution annealing temperature — critical for preventing carbide re-precipitation
CNC Machining Center (5-axis)	Table: 4,000 mm × 2,500 mm; Max workpiece dia.: 4,000 mm	Finish machining of large 2.4603 components to ±0.05 mm tolerances; 5-axis complex surface profiles
CNC Vertical Lathe	Max turning dia.: 5,000 mm; Max height: 3,000 mm	Rough and finish turning of large discs, rings, and flanges
CNC Cylindrical Grinder	Max workpiece dia.: 800 mm; Max length: 6,000 mm	Precision grinding of shafts and spindles to Ra 0.4 μm / IT5 tolerance
Dynamic Balancing Machine	Max rotor mass: 5,000 kg; Speed: up to 15,000 RPM	Balancing of compressor impellers, pump rotors to ISO 1940-1 G1.0 or finer

Annual Production Capacity

Jiangsu Liangyi's annual nickel alloy forging production capacity (including 2.4603 NiCr30FeMo and other nickel alloys) exceeds 8,000 metric tons of finished forgings per year, with 2.4603 NiCr30FeMo representing approximately 15–20% of our nickel alloy production volume. We keep a standing stock of 2.4603 raw material billets in common sizes to support expedited delivery requirements.

How to Get an Accurate Quote: RFQ Information Checklist

To provide you with an accurate quotation for 2.4603 NiCr30FeMo forging parts within our 24-hour response commitment, please include the following information in your inquiry. Incomplete inquiries result in requests for clarification that delay your quotation — the checklist below tells you exactly what we need, and why.

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Drawings or Dimensions

DXF/DWG/PDF engineering drawing preferred. If no drawing available, provide: product type (bar/ring/disc/hollow), main dimensions (OD, ID, length, wall thickness), and forging/machining allowance requirement.

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Material Specification

Confirm: "2.4603 NiCr30FeMo / UNS N08031" and specify the applicable standard (e.g., EN 10095, ASTM B472, ASME SB-462). If an alternative designation was specified by your end-client, include it so we can cross-reference.

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Delivery Condition

Specify: as-forged, rough-turned, semi-finished, finish machined to drawing, or precision ground. Also specify heat treatment condition: solution annealed (standard), stabilization annealed, or other.

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Mechanical Property Requirements

Specify any requirements beyond EN 10095 / ASTM B472 standard minimums — e.g., elevated temperature tensile, Charpy impact at specific temperature (e.g., –60°C), grain size class, or NACE MR0175 hardness limit.

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NDT & Inspection Level

Specify: UT acceptance level (ASTM A388 Level A/B/C), surface NDT (MT or PT, and reference standard), and whether third-party witness inspection is needed and by which body (BV, SGS, TÜV, DNV, etc.).

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Documentation Requirements

Specify: EN 10204 3.1 or 3.2 MTC; any project-specific quality plans (ITP); certificate of origin country requirements; any nuclear or API documentation packages (API 6A Product Specification Level, etc.).

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Quantity & Delivery Schedule

Quantity per item (pieces or kg), total order weight estimate, and needed delivery date. If phased delivery is acceptable, please indicate — this can often allow us to offer shorter initial delivery lead times.

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Destination & Incoterms

Delivery destination port or address, and your preferred Incoterms (EXW, FOB Ningbo/Shanghai, CIF, DDP). We support all standard Incoterms for export to 50+ countries.

✅ Our Commitment: Upon receipt of the above information, Jiangsu Liangyi guarantees a detailed technical and commercial quotation within 24 hours (business days, China time UTC+8). For urgent project requirements, contact us by phone/WhatsApp at +86-13585067993 for same-day response.

Frequently Asked Questions About 2.4603 (NiCr30FeMo) Forging Parts

What is 2.4603 (NiCr30FeMo) alloy, and what are its other designations?

2.4603 is the EN/DIN W.Nr. (Werkstoffnummer) for a nickel-chromium-iron-molybdenum-copper superalloy. Its equivalent names are UNS N08031 (US) and Alloy 31 (common trade name). The alloy contains 28–31.5% chromium, the highest chromium level among commercial nickel alloys, giving it excellent resistance to oxidizing acid environments such as nitric acid, phosphoric acid, and mixed acids. It also fully meets NACE MR0175 sour service requirements. Main uses include oil and gas wellhead parts, nuclear reactor coolant pump parts, phosphoric acid plant equipment, HPAL autoclaves, and gas turbine valve parts.

What is the PREN value of 2.4603, and why does it matter?

2.4603 NiCr30FeMo has a Pitting Resistance Equivalent Number (PREN) of about 54, calculated using the formula PREN = %Cr + 3.3×%Mo + 16×%N.For comparison: 316L stainless steel has a PREN of around 24, duplex stainless steel 2205 around 36, UNS N10276 (Hastelloy® C-276) around 51, and UNS N06625 (Inconel® 625) around 51.A higher PREN means better resistance to the start of pitting corrosion in environments with chlorides.With a PREN of about 54, 2.4603 is one of the most pitting-resistant commercial nickel alloys produced as forgings. This is the main reason it is used for offshore oil and gas wellhead parts, seawater-cooled equipment, and NACE MR0175 sour service applications with high chloride levels.

How does 2.4603 compare to UNS N10276 in phosphoric acid service?

2.4603 NiCr30FeMo performs much better than UNS N10276 (also called Hastelloy® C-276, a registered trademark of Haynes International) in phosphoric acid (H₃PO₄) applications, especially in wet-process phosphoric acid with fluoride impurities.UNS N10276 uses a molybdenum-based passive film that is not stable in the oxidizing conditions found in commercial phosphoric acid systems.2.4603 uses a chromium oxide (Cr₂O₃) passive film. With 28–31.5% chromium content, this film stays stable over a much wider range of oxidizing potentials and regrows quickly if damaged mechanically.In our customer cases, 2.4603 parts replaced UNS N10276 parts that failed within 6–8 months in wet-process H₃PO₄. The 2.4603 parts showed corrosion rates below 0.05 mm/year and have run for more than 6 years with no replacement needed.Note: UNS N10276 works very well in its designed environments, such as pure reducing acids and HCl. The performance difference mentioned here only applies to oxidizing acid service.

What heat treatment is required for 2.4603 NiCr30FeMo forgings?

The standard delivery condition for 2.4603 NiCr30FeMo forgings is solution annealed: heated to 1,050–1,120°C, held for at least 1.5 minutes per mm of section thickness (minimum 30 minutes total), then rapidly water quenched.The rapid quench is important — slow cooling through the carbide precipitation range (600–900°C) would let chromium carbides form at grain boundaries, removing chromium from the surrounding material and greatly lowering corrosion resistance in a process called sensitization.Jiangsu Liangyi's computer-controlled furnaces and large agitated water quench tank (300 m³) ensure the correct heat treatment cycle even for the largest forgings.For welding used in nuclear or highly corrosive service, a stabilization anneal at 940–980°C followed by water quench can be ordered to form niobium carbides first and prevent grain boundary sensitization.

What is the maximum size of 2.4603 forged parts you can produce?

Jiangsu Liangyi can produce 2.4603 NiCr30FeMo forged parts within these size ranges:Forged bars: 50 mm to 2,000 mm in diameter, up to 15,000 mm long, up to 30 tons per piece.Seamless rolled rings: 200 mm to 6,000 mm outer diameter, 50–2,500 mm height, 30–800 mm wall thickness, up to 30 tons per piece.Forged discs: 200 mm to 3,000 mm diameter, up to 20 tons.Hollow forgings and sleeves: 200 mm to 3,000 mm outer diameter, up to 8,000 mm long, up to 25 tons.Custom-shaped forgings: made to your drawing, up to 30 tons.Full CNC machining to final finished sizes is available for all dimensions upon request.

What certifications do you hold for 2.4603 NiCr30FeMo forgings?

Jiangsu Liangyi is certified to ISO 9001:2015 for our quality management system.We do not hold API 6A or PED 2014/68/EU as independent company certifications at this time.Our 2.4603 NiCr30FeMo forgings are produced to meet API 6A, ASME, EN, and NACE MR0175 / ISO 15156 material and dimensional requirements as specified by the client — this is standard practice for forging suppliers in international supply chains.EN 10204 3.1 MTCs are provided with every shipment as standard.EN 10204 3.2 (third‑party witnessed) is available when the client arranges TPI inspection by BV, SGS, TÜV, DNV, Lloyd’s Register, or RINA.For end uses regulated by API or PED, product certification is issued by the licensed downstream manufacturer or system integrator, not by the raw forging supplier.

What is the lead time for custom 2.4603 forging parts?

The standard lead time for custom 2.4603 NiCr30FeMo forged parts is 3–4 weeks for small-batch orders (total weight up to 5 tons, standard shapes), and 4–6 weeks for large or custom parts (single piece over 5 tons, or parts needing extensive CNC machining).For high‑integrity applications that need TPI witnessed inspection across multiple production stages, allow 6–8 weeks to align with TPI agency schedules.We can speed up production for urgent orders — share your needed delivery date and we will confirm feasibility.We keep regular stock of 2.4603 raw material billets in common sizes to support faster turnaround for standard part forms.

Can you provide full CNC machining for 2.4603 forged parts?

Yes. Jiangsu Liangyi provides full in-house CNC machining for all 2.4603 NiCr30FeMo forgings, including: 5-axis CNC machining centers (max workpiece size 4,000 mm × 2,500 mm), CNC vertical lathes (max turning diameter 5,000 mm), CNC horizontal lathes, milling, boring, drilling, threading, and cylindrical grinding down to Ra 0.4 μm / IT5. We also perform dynamic balancing for rotating parts to ISO 1940-1 G1.0 or tighter. Parts are delivered ready for installation per your drawing, including complete dimensional inspection reports and material test certificates.

Contact Us for Custom 2.4603 (NiCr30FeMo) Forging Solutions

Jiangsu Liangyi is your trusted China manufacturer and supplier of high-quality 2.4603 NiCr30FeMo forging parts. As a professional nickel alloy forging factory with over 25 years of experience, we are committed to providing you with great quality products, competitive prices and professional technical support. We welcome your inquiries with custom drawings, material requirements and quantity details — a detailed technical quotation and tailored forging solution will be returned within 24 hours.

Inquiry Email: sales@jnmtforgedparts.com

Phone / WhatsApp: +86-13585067993

Website: https://www.jnmtforgedparts.com

Address: Chengchang Industry Park, Jiangyin City, Jiangsu Province, China 214400

Trademark Notice: Hastelloy® is a registered trademark of Haynes International, Inc. Inconel® and Incoloy® are registered trademarks of Special Metals Corporation. These names are used on this page solely for technical identification and comparative reference purposes. Jiangsu Liangyi Co., Limited is not affiliated with, endorsed by, or a licensed distributor of Haynes International or Special Metals Corporation. All third-party alloy designations referenced herein are identified by their UNS numbers; trade names appear in parentheses for reader reference only.

Certification Notice: Jiangsu Liangyi Co., Limited holds ISO 9001:2015 quality management certification. References to API 6A, PED 2014/68/EU, NACE MR0175, ASME, EN, and other standards on this page describe the requirements our products are manufactured to upon client specification, not independently held company certifications unless explicitly stated otherwise. API 6A product certification and PED CE marking are issued by the licensed downstream manufacturer or their designated Notified Body as applicable to the end application.