What is the maximum size for Hastelloy G30 forgings from Jiangyin China?

Jiangsu Liangyi Co., Limited manufactures: forged bars up to 2000mm diameter × 15m length; seamless rolled rings up to 6m outer diameter, 30 tons; forged discs/tube sheets up to 4000mm diameter; hollow forgings up to 3000mm OD; single-piece weight from 30kg to 35 tons.

What is the delivery time for Hastelloy G30 forgings from China?

Standard delivery: 25–45 working days. Shipping from Shanghai Port: 15–30 days to North America, Europe, Middle East, Southeast Asia. Expedited production available for urgent requirements.

Hastelloy G30 (Alloy G-30, UNS N06030) Forging Parts — Complete Technical Guide & Custom Manufacturing | Jiangyin, China

Q: What is Hastelloy G30 (UNS N06030)?

Hastelloy G30 (UNS N06030, Alloy G-30) is an advanced nickel-chromium-iron-molybdenum-copper super alloy with 28–31.5% chromium, designed for superior resistance in oxidizing acid environments especially phosphoric acid with fluoride and chloride impurities. Key properties: UTS ≥ 586 MPa, yield ≥ 241 MPa, elongation ≥ 30%, density 8.22 g/cm³, max service temp 427°C (800°F). Offers 30–40% better pitting/crevice corrosion resistance than Alloy G-3.

Q: What is the corrosion rate of Hastelloy G30 in phosphoric acid?

In 85% phosphoric acid (H₃PO₄) at 80°C, Hastelloy G30 shows a corrosion rate of approximately 0.02–0.05 mm/year. In 65% phosphoric acid at 60°C, the rate is typically below 0.03 mm/year. These values are 30–40% lower than Alloy G-3 under identical conditions, and approximately 5–8× lower than 316L stainless steel. In wet-process phosphoric acid containing fluoride (0.1–0.5% F⁻) and chloride (200–1000 ppm Cl⁻) impurities, G30 maintains corrosion rates below 0.1 mm/year at temperatures up to 85°C.

Q: What is the recommended welding procedure for Hastelloy G30?

Recommended welding method for Hastelloy G30 is GTAW (TIG) as primary method. Filler metal: ERNiCrMo-11 (AWS A5.14) or equivalent Hastelloy G30 matching filler. Preheat: Not required (room temperature is acceptable). Interpass temperature: Maximum 120°C (250°F). Post-weld heat treatment: Generally NOT required — G30 can be used in the as-welded condition for most chemical process applications due to its exceptional HAZ sensitization resistance. Shielding gas: 100% Argon (min 99.99% purity). PWHT (if specified): Solution anneal at 1120–1175°C, water quench.

Q: What is the heat treatment specification for Hastelloy G30 forgings?

Standard heat treatment for Hastelloy G30 (UNS N06030) forgings is solution annealing: heating to 1120–1175°C (2050–2150°F), holding for adequate time (minimum 1 hour per 25mm thickness), followed by rapid water quench or forced air cooling. This dissolves carbides and restores maximum corrosion resistance. No precipitation hardening heat treatment is available for G30. All heat treatment cycles at our Jiangyin factory are computer-controlled with ±5°C accuracy and full digital recording.

Q: What certifications do your Hastelloy G30 forgings have?

Our Jiangyin factory holds ISO 9001:2015 quality management system certification. Products are manufactured to comply with NACE MR0175 / ISO 15156 material requirements for sour service. We provide EN 10204 3.1 mill test certificates as standard. Third-party inspection by SGS, BV, DNV, or your nominated inspector is available on request.

Q: How does Hastelloy G30 compare to Alloy 625 and Alloy 825?

vs. Alloy 625 (N06625): G30 has superior resistance in oxidizing acids (especially phosphoric acid), while 625 is better in reducing acids (HCl) and high-temperature applications above 427°C. 625 is more expensive. vs. Alloy 825 (N08825): G30 offers significantly better oxidizing acid resistance due to higher Cr content (28–31.5% vs 19.5–23.5% for 825) and better SCC resistance in chloride environments. 825 is a lower-cost option for moderate service conditions only.

✓ ISO 9001:2015 Certified ✓ In-House Testing Lab ✓ NACE MR0175 ✓ EN 10204 3.1/3.2 ✓ 3rd Party Inspection Available ✓ ASME Standard Compliance

Jiangsu Liangyi Co., Limited (JNMT Forged Parts) is an ISO 9001:2015 certified open die forging and seamless ring rolling manufacturer in Jiangyin City, Jiangsu Province, China, with more than 25 years of specialized nickel alloy expertise. We have supplied Hastelloy G30 (Alloy G-30, UNS N06030) forging parts to over 120 clients in more than 50 countries around the world, including many Fortune 500-level industrial companies. This page provides the complete technical data sheet — chemical composition, mechanical and physical properties, corrosion rate data, welding procedure, heat treatment specification, SCC resistance, material comparisons, and ordering guide.

We provide a full range of service from premium steel melting (VIM+ESR+VAR or VIM+VAR) , open die forging, seamless ring rolling, controlled heat treatment (±5°C), CNC machining (±0.02 mm) to third-party audited inspection. We provide custom Hastelloy G30 forged parts range from 30 kg to 35 tons,and they are all made based on clients' drawings. Request a Custom Quote Jump to Technical Data

25+

Years Nickel Alloy Expertise

120+

Global Clients, 50+ Countries

30+

Major Industrial Clients Served Globally

80,000 m²

Production Base in Jiangyin

35 t

Max Single-Piece Weight

6 m

Max Ring Outer Diameter

Custom Hastelloy G30 (Alloy G-30, UNS N06030) forged round bars and flat bars — up to 2000mm diameter manufactured in Jiangyin, China

Full Range of Custom Hastelloy G30 (Alloy G-30, UNS N06030) Forged Products

We produce a full portfolio of UNS N06030 Alloy G-30 forged parts for extreme applications in highly corrosive, high-pressure, and high-temperature environments. Every product is made based on customer drawings with full material traceability from melt heat to finished product.

Forged Bars & Rods

We provide Hastelloy G30 forged round bars, square bars, flat bars, rectangular bars, step shafts, and splined shafts , with the max diameter 2000 mm and max length 15 m. They are used for rotating equipment, structural parts and CNC machining stock. Get a Quote

Seamless Rolled Forged Rings

We provide Alloy G-30 seamless rolled rings, contoured forged rings, gear rings, and valve seat rings , with the max outer diameter 6 m and max weight 30 t. They are used for pressure vessels, turbines, and rotating machinery. Get a Quote

Hollow Forgings & Sleeves

We provide UNS N06030 forged hubs, housings, shells, sleeves, bushings, casings and heavy-wall cylinders ,with the max OD 3000 mm. They are used for fluid control systems and pressure applications. Get a Quote

Forged Discs, Plates & Tube Sheets

We provide Hastelloy G30 forged discs, blocks, plates, and tube sheets ,with the max diameter 4000 mm and max thickness 500 mm. They are the best choice material for heat exchangers, pressure vessels, and boiler parts. Get a Quote

Valve & Pump Forged Components

We provide alloy G-30 forged valve bodies, balls, stems, bonnets, seat rings, pump casings, impellers, shafts, and wear rings . They all fully meet API 6D, API 6A, and NACE MR0175 / ISO 15156. Get a Quote

Custom Machined Forgings to Drawing

UNS N06030 custom forgings are made based on client drawings with dimensional tolerance ±0.02 mm, full NDT (UT/MT/PT/LP), and EN 10204 3.1 / 3.2 MTC. Get a Custom Quote

Material Overview & Key Advantages of Hastelloy G30 (Alloy G-30, UNS N06030)

Hastelloy G30 (UNS N06030, also known as Alloy G-30) is an advanced nickel-chromium-iron-molybdenum-copper superalloy designed as a major improvement over the traditional Alloy G-3.Its typical composition is: nickel (balance), chromium 28–31.5%, iron 13–17%, molybdenum 4–6%, copper 1–2.4%, tungsten 1.5–4%, and niobium + tantalum 0.3–1.5%.It has the highest chromium content among all G-series alloys, so that it has excellent performance in commercial phosphoric acid and mixed oxidizing acid environments containing fluoride and chloride impurities.

Key Differentiating Advantages of Hastelloy G30 Forgings from Jiangyin, ChinaSuperior Weldability — No Post-Weld Heat Treatment Needed: Excellent resistance to grain boundary carbide precipitation in the weld heat-affected zone (HAZ) due to low carbon (≤0.03%) and Nb+Ta stabilization. G30 can be used in the as-welded condition for most chemical process applications — deleting costly PWHT. This is an important advantage over Hastelloy C276 and 316L SS.
Best-in-Class Phosphoric Acid Resistance: In commercial wet-process phosphoric acid (H₃PO₄) containing fluoride (F⁻) and chloride (Cl⁻) impurities, G30 shows corrosion rates 30–40% lower than Alloy G-3 and 5–8× lower than 316L stainless steel. So that G30 is the best choice material for phosphoric acid heat exchangers, tube sheets, and piping systems around the world.
Wide Operating Temperature Range:It has great mechanical properties and resistance to corrosion from cryogenic temperatures (–196°C) to 427°C (800°F), which is the full range of temperatures that chemical processing, oil and gas, and nuclear power can work in.
Stable Mechanical Performance: We get a fine-grained internal structure through forging and controlled heat treatment, making sure every production batch has consistent tensile strength, yield strength, and ductility . 
Premium Melt Quality: VIM+ESR+VAR (triple melting) for nuclear/aerospace applications, or VIM+VAR (double melting) for oil and gas, chemical, and power generation — ensuring ultra-low inclusion content (≤Class 1 per ASTM E45) and optimal mechanical homogeneity.

Chemical Composition of Hastelloy G30 (UNS N06030) — Per ASTM Standard

Table 1: Hastelloy G30 (Alloy G-30, UNS N06030) Chemical Composition (Weight %)
Element	Content Range (wt.%)	Role in Corrosion Performance
Nickel (Ni)	Balance (~40–47%)	Base matrix; ductility, SCC resistance, acid resistance foundation
Chromium (Cr)	28.00 – 31.50	Primary oxidizing acid resistance; pitting & crevice corrosion protection (highest in G-family)
Iron (Fe)	13.00 – 17.00	Cost balance; structural support; reduces raw material cost vs. high-Ni alloys
Molybdenum (Mo)	4.00 – 6.00	Reducing acid resistance; chloride pitting & crevice corrosion protection
Copper (Cu)	1.00 – 2.40	Resistance to H₂SO₄ and HF; synergistic with Cr in oxidizing environments
Tungsten (W)	1.50 – 4.00	Enhances pitting & crevice corrosion resistance; Mo synergy in mixed acid environments
Cobalt (Co)	5.00% max	High-temperature strength; controlled for nuclear applications
Manganese (Mn)	1.50% max	Deoxidation; hot workability during forging
Niobium + Tantalum (Nb+Ta)	0.30 – 1.50	Carbide stabilization; prevents sensitization in weld HAZ (key to PWHT-free welding)
Carbon (C)	0.03% max	Limits Cr₂₃C₆ carbide precipitation; critical for HAZ sensitization resistance
Phosphorus (P)	0.04% max	Minimizes hot cracking during welding and hot forming
Silicon (Si)	0.80% max	Deoxidation; controlled to avoid embrittlement
Sulfur (S)	0.02% max	Minimizes hot shortness; critical for forgeability and ductility

Mechanical Properties of Hastelloy G30 Forgings (Annealed Delivery Condition)

Table 2: Hastelloy G30 (UNS N06030) Minimum Mechanical Properties — Annealed Condition
Property	Min. Value (Imperial)	Min. Value (Metric)	Test Standard
Ultimate Tensile Strength (UTS)	85 KSI	586 MPa	ASTM E8
Yield Strength (0.2% Offset)	35 KSI	241 MPa	ASTM E8
Elongation in 2 in (50 mm)	30%	30%	ASTM E8
Reduction in Area	—	≥ 40% (typical)	ASTM E8
Hardness (Brinell)	—	≤ 241 HB (typical)	ASTM E10
Charpy Impact (–196°C / –320°F)	—	≥ 60 J typical	ASTM E23

✅ Note on Hardness Customization

Hardness of Hastelloy G30 forgings can be adjusted through controlled heat treatment parameters at our Jiangyin facility. For NACE MR0175 / ISO 15156 sour service compliance, hardness is controlled to ≤ 22 HRC (≤ 237 HB). Please specify your hardness requirement in your inquiry.

Physical Properties of Hastelloy G30 (UNS N06030)

The following physical properties are essential for equipment design engineers working with Alloy G-30 (UNS N06030) in heat exchanger design, piping thermal stress analysis, and structural calculations:

Table 3: Physical Properties of Hastelloy G30 (Alloy G-30, UNS N06030)
Property	Value	Unit	Condition
Density	8.22	g/cm³ (0.297 lb/in³)	Room temperature
Melting Range	1315 – 1355	°C (2400–2470°F)	—
Thermal Conductivity	11.3	W/(m·K)	24°C (75°F)
Thermal Conductivity	15.9	W/(m·K)	300°C (572°F)
Specific Heat Capacity	452	J/(kg·K)	24°C (75°F)
Thermal Expansion Coefficient	13.1	μm/(m·°C) [μin/(in·°F): 7.3]	24–100°C (75–212°F)
Thermal Expansion Coefficient	13.9	μm/(m·°C)	24–300°C (75–572°F)
Thermal Expansion Coefficient	14.5	μm/(m·°C)	24–427°C (75–800°F)
Elastic Modulus (Young's Modulus)	196	GPa (28.4 × 10⁶ psi)	Room temperature
Shear Modulus	76	GPa	Room temperature
Poisson's Ratio	0.29	—	Room temperature
Electrical Resistivity	1.17	μΩ·m (46.1 μΩ·in)	Room temperature
Magnetic Permeability	< 1.005	μr	Room temperature (essentially non-magnetic)

Corrosion Rate Data — Hastelloy G30 (UNS N06030) in Phosphoric, Nitric & Sulfuric Acid

The following corrosion rate data for Hastelloy G30 (Alloy G-30, UNS N06030) are derived from published ASTM immersion testing results and field performance data from commercial chemical processing plants. All corrosion rates are expressed in mm/year (millimeters per year). Results are for annealed, polished specimens unless otherwise noted.

ℹ️ Corrosion Rate Classification Used in This Table

Excellent: < 0.1 mm/year — Recommended for long-term service | Acceptable: 0.1–0.5 mm/year — Suitable with periodic inspection | Not Recommended: > 0.5 mm/year

6.1 Phosphoric Acid (H₃PO₄) — Pure & Commercial Grade (with F⁻/Cl⁻ Impurities)

Table 4: Corrosion Rate of Hastelloy G30 (UNS N06030) in Phosphoric Acid — mm/year
H₃PO₄ Concentration	Temperature	Hastelloy G30 (N06030)	Alloy G-3 (N06985)	316L SS (S31603)	Hastelloy C276 (N10276)
50% H₃PO₄ (pure)	25°C (77°F)	< 0.02	< 0.03	0.18	0.12
	60°C (140°F)	0.03	0.04	0.35	0.28
	Boiling (~148°C)	0.08	0.13	1.2	0.45
70% H₃PO₄ (pure)	25°C (77°F)	< 0.02	0.03	0.22	0.15
	60°C (140°F)	0.04	0.06	0.48	0.32
	Boiling (~162°C)	0.09	0.14	1.8	0.50
85% H₃PO₄ (pure)	25°C (77°F)	< 0.02	0.03	0.30	0.18
	80°C (176°F)	0.02–0.05	0.07–0.10	0.55	0.38
	Boiling (~175°C)	0.07	0.12	2.1	0.60
Wet-process H₃PO₄ (68–72%) +0.3% F⁻ + 500 ppm Cl⁻	80°C (176°F)	0.04–0.08	0.12–0.18	1.5–3.0	0.35–0.55
Wet-process H₃PO₄ (85%) +0.5% F⁻ + 1000 ppm Cl⁻	85°C (185°F)	0.05–0.09	0.18–0.28	2.5–5.0	0.40–0.65

✅ Key Finding: Wet-Process Phosphoric Acid with Fluoride/Chloride

In wet-process phosphoric acid containing 0.3–0.5% F⁻ and 500–1000 ppm Cl⁻ impurities at 80–85°C, Hastelloy G30 shows corrosion rates 3–6× lower than Alloy G-3 and 20–40× lower than 316L stainless steel. This makes G30 the industry benchmark material for phosphoric acid heat exchanger tube sheets and process piping.

6.2 Nitric Acid (HNO₃)

Table 5: Corrosion Rate of Hastelloy G30 (UNS N06030) in Nitric Acid (HNO₃) — mm/year
HNO₃ Concentration	Temperature	Hastelloy G30 (N06030)	Alloy G-3 (N06985)	316L SS (S31603)	C276 (N10276)
10% HNO₃	Boiling (~101°C)	< 0.05	0.06	0.05	0.22
30% HNO₃	Boiling (~107°C)	< 0.05	0.07	0.08	0.35
50% HNO₃	Boiling (~115°C)	0.04–0.08	0.12	0.10	0.85
65% HNO₃	Boiling (~121°C)	0.08–0.15	0.22	0.18	1.8
Mixed acid (HNO₃ + HF)	60°C (140°F)	0.05–0.10	0.18	0.85	0.95

Hastelloy G30 performs exceptionally well in nitric acid thanks to its high chromium content of 28–31.5%, which forms a stable, self-repairing passive Cr₂O₃ film even in strongly oxidizing environments.By contrast, C276 performs much worse in HNO₃ because of its lower chromium content of 14.5–16.5%.

6.3 Sulfuric Acid (H₂SO₄)

Table 6: Corrosion Rate of Hastelloy G30 (UNS N06030) in Sulfuric Acid (H₂SO₄) — mm/year
H₂SO₄ Concentration	Temperature	Hastelloy G30 (N06030)	Alloy G-3	316L SS	C276
10% H₂SO₄	25°C (77°F)	0.05	0.06	0.25	0.03
10% H₂SO₄	Boiling (~102°C)	0.08	0.12	1.8	0.06
30% H₂SO₄	25°C (77°F)	0.07	0.09	0.65	0.04
50% H₂SO₄	25°C (77°F)	0.15	0.22	2.5	0.06
70% H₂SO₄	25°C (77°F)	0.28	0.38	5.0+	0.12
H₂SO₄ + HNO₃ mixed acid	60°C (140°F)	0.06–0.12	0.18	1.5	0.25

⚠️ Note on High-Concentration Sulfuric Acid

For H₂SO₄ concentrations above 50% at elevated temperatures, Hastelloy C276 or Alloy B-3 (UNS N10675) may be a better choice due to their higher molybdenum content. G30 is optimized for oxidizing acid environments and mixed acid systems — not for high-concentration pure reducing acids. Contact our technical team for application-specific material selection advice.

Stress Corrosion Cracking (SCC) Resistance of Hastelloy G30 (UNS N06030)

Stress corrosion cracking (SCC) is an important failure mode for nickel alloys in corrosive environments under tensile stress. The following data characterizes Hastelloy G30's SCC resistance in key service environments:

Table 7: SCC Resistance of Hastelloy G30 (UNS N06030) vs. Key Alloys
Environment	Hastelloy G30 (N06030)	316L SS (S31603)	Alloy G-3 (N06985)
Boiling 42% MgCl₂ (polythionic acid SCC test)	No cracking (passed)	Rapid cracking (< 24h)	No cracking
H₂S (sour gas) — NACE TM0177 Method A (0.1 bar H₂S, pH 3.5)	Passed (≤ 22 HRC hardness)	Failed (sensitized)	Passed
Chloride SCC (200°C NaCl brine, stressed to 80% yield)	No cracking after 1000h	Cracking within 200h	No cracking after 500h
Wet H₂S + CO₂ + Chloride (NACE MR0175 sour service)	Fully compliant at ≤ 22 HRC	Not compliant	Compliant
Polythionic acid (PTA) SCC in refinery service	Resistant (as-welded)	Susceptible (sensitized weld)	Resistant

NACE MR0175 / ISO 15156 Compliance for Hastelloy G30 Forgings

For sour service (H₂S-containing) applications in oil and gas, Hastelloy G30 (UNS N06030) forgings meet NACE MR0175 / ISO 15156 Part 3 when the following conditions are met:

Hardness: ≤ 35 HRC (maximum — our standard delivery is ≤ 22 HRC for full NACE compliance)
Heat treatment: Solution annealed condition (1120–1175°C, water quench)
Cold work: Less than 10% cold reduction after final heat treatment
Material certification: EN 10204 3.1 MTC with hardness test results per ASTM E18/E10

✅ NACE Hardness Test Reporting Available

We provide all Hastelloy G30 forgings for sour service applications with individual Brinell or Rockwell hardness test reports, included as part of the EN 10204 3.1 MTC package. NACE hardness mapping (multiple test locations per piece) is also available on request.

Welding Procedure & Filler Metal Guide for Hastelloy G30 (UNS N06030)

One of the best things about Hastelloy G30 is how easy it is to weld. G30 is different from many other nickel alloys in that it can be used in the as-welded state for most chemical process applications without needing post-weld heat treatment (PWHT).

This is due to its low carbon content (≤0.03%) and the Nb+Ta addition that stabilizes carbides and prevents sensitization in the weld heat-affected zone (HAZ).

8.1 Recommended Welding Methods

Table 8: Recommended Welding Methods for Hastelloy G30 (UNS N06030)
Welding Method	Application	Recommended Filler Metal	AWS/ISO Classification
GTAW (TIG) — Primary Method	Precision welds, thin-wall, root passes, tube-to-tubesheet	Hastelloy G30 matching filler wire	AWS A5.14: ERNiCrMo-11
GMAW (MIG)	Thicker sections, production welding, less critical joints	Hastelloy G30 matching filler wire	AWS A5.14: ERNiCrMo-11
SMAW (Stick)	Field welding, repair welding	Hastelloy G30 matching electrode	AWS A5.11: ENiCrMo-11
SAW (Submerged Arc)	Heavy cladding, weld overlay on tube sheets	Hastelloy G30 wire + neutral flux	ERNiCrMo-11 + appropriate flux

8.2 Welding Parameters & Critical Controls

Table 9: Hastelloy G30 Welding Parameters
Parameter	Specification	Reason
Preheat Temperature	Not required (room temperature acceptable)	G30 has no hydrogen embrittlement susceptibility; low-carbon content
Interpass Temperature	Maximum 120°C (250°F)	Prevents sigma phase formation; maintains corrosion resistance
Shielding Gas (GTAW)	100% Argon (≥ 99.99% purity), 15–20 L/min	Prevents oxidation; no N₂ or CO₂ additions
Back Purge Gas	100% Argon (≥ 99.99% purity)	Prevents root oxidation in pipe/tube welds
Heat Input	Low to medium: 0.5–1.5 kJ/mm	Minimizes HAZ width; prevents grain growth
Post-Weld Heat Treatment (PWHT)	Generally NOT required for most chemical process applications	Nb+Ta stabilization prevents HAZ sensitization; as-welded condition acceptable per NACE SP0472
PWHT (if specified for ultra-critical service)	Solution anneal at 1120–1175°C (2050–2150°F), water quench	Fully restores maximum corrosion resistance for the most demanding applications
Pre-weld cleaning	Degrease with acetone; mechanically clean within 25 mm of weld zone; use dedicated stainless steel brushes (never carbon steel)	Prevents iron contamination; eliminates chloride residues

⚠️ Critical: Avoid These Welding Mistakes with Hastelloy G30

Never use carbon steel tools (brushes, grinding discs) on G30 — iron contamination causes severe localized corrosion in service.
Do not exceed 120°C interpass temperature — high heat input makes sigma phase form and makes the HAZ less resistant to corrosion.
Do not use nitrogen or CO₂ in shielding gas — because they make nickel alloy welds more porous and cause nitriding.
Do not use 309L or 312 filler metals — Always use ERNiCrMo-11 filler for G30. Using different filler metals will make the weld zone less resistant to corrosion.

Heat Treatment Specification for Hastelloy G30 (UNS N06030) Forgings

Correct heat treatment is essential to get maximum corrosion resistance and improved mechanical properties for Hastelloy G30 forged parts. All heat treatment at our Jiangyin factory is performed in computer-controlled gas or electric furnaces with ±5°C temperature accuracy and full digital cycle recording for 100% traceability.

Table 10: Heat Treatment Specification for Hastelloy G30 (UNS N06030) Forgings
Heat Treatment Type	Temperature	Hold Time	Cooling Method	Resulting Condition
Solution Annealing (Standard)	1120–1175°C (2050–2150°F)	Min. 1h per 25mm thickness (max 30min minimum for thin sections)	Rapid water quench (agitated; < 3 min transfer time from furnace to water)	Maximum corrosion resistance; fully recrystallized, fine-grained microstructure; all carbides in solid solution
Solution Annealing + Air Cool (for large forgings)	1120–1175°C (2050–2150°F)	Min. 1h per 25mm thickness	Rapid forced air cooling (for sections where water quench causes distortion)	Good corrosion resistance; some risk of minor carbide precipitation in very heavy sections — clarify with engineering team
Stress Relief (if required)	870–900°C (1600–1650°F)	1–4 hours depending on section thickness	Slow furnace cool or air cool	Reduced residual stress; Note: this cycle may slightly reduce corrosion resistance — generally NOT recommended as substitute for full solution anneal
Precipitation Hardening	Not applicable — Hastelloy G30 is a solid-solution strengthened alloy with no precipitation hardening capability

Hot Forming (Forging) Temperature Range

Table 11: Hastelloy G30 Hot Forging Temperature Parameters
Parameter	Specification
Forging Start Temperature	1175–1230°C (2150–2250°F) — Never exceed 1260°C to prevent incipient melting of grain boundaries
Minimum Forging Temperature	980°C (1800°F) — Reheat immediately if temperature drops below this threshold
Heating Rate	Slow and uniform to prevent thermal cracking — maximum 150°C/hr below 650°C; then can be increased to 200°C/hr
Atmosphere	Slightly reducing or neutral (low sulfur content) — avoid high-sulfur fuels as sulfur causes severe hot cracking in nickel alloys
Post-Forge Cooling	Air cool to <100°C before solution annealing
Total Reduction Required	Minimum 40% total reduction from billet to achieve full recrystallization and uniform fine-grained microstructure
Post-Forge Heat Treatment	Solution anneal at 1120–1175°C + water quench mandatory for all finished forgings

Machining Guide for Hastelloy G30 (UNS N06030) Forgings

Hastelloy G30 is more difficult to machine than carbon steel or 316L stainless steel due to its high work-hardening rate, high hot strength, and tendency to generate built-up edge on cutting tools. However, with the correct tooling and cutting parameters, excellent surface finish and tight tolerances (±0.02 mm) can be achieved. Our Jiangyin CNC machining center is optimized for nickel alloy machining.

10.1 Key Machining Characteristics

High work-hardening rate: G30 work-hardens rapidly during cutting. Never dwell the tool in the cut — keep constant feed rate and depth of cut to stay below the work-hardened surface layer.
High cutting forces: Cutting forces are approximately 2–3 times higher than for 304 stainless steel. Use rigid, vibration-free fixturing and heavy-duty machine tools.
Heat generation: G30 has low thermal conductivity — heat concentrates at the cutting edge rather than dissipating into the workpiece. Use ample high-pressure coolant (minimum 70 bar).
Built-up edge (BUE): Tendency to weld to cutting tool at low speeds. Use sharp, coated carbide or ceramic inserts at recommended speeds.

Table 12: Recommended Machining Parameters for Hastelloy G30 (UNS N06030)
Operation	Tool Material	Cutting Speed (m/min)	Feed Rate (mm/rev)	Depth of Cut (mm)	Coolant
Rough Turning	Carbide (PVD TiAlN coated), CNMG/DNMG inserts	30–50	0.20–0.35	3–6	Flood (high pressure, soluble oil)
Finish Turning	Carbide (PVD TiAlN coated), CCMT/DCMT inserts	50–80	0.05–0.15	0.5–2	Flood (high pressure)
Drilling	Solid carbide drill, 130° point angle, TiAlN coated	15–25	0.05–0.12	—	High-pressure through-spindle coolant (70+ bar)
Milling (Face)	Carbide inserts, positive rake angle	25–40	0.08–0.15 per tooth	2–4	Flood
Milling (End)	Solid carbide, AlTiN coated, 4-flute	20–35	0.05–0.10 per tooth	1–3 radial	Flood or MQL
Threading	Carbide tap or thread mill, TiAlN coated	5–10	Per pitch	—	Flood + sulphurized cutting oil
Grinding	Cubic Boron Nitride (CBN) or aluminum oxide wheel	Wheel: 25–35 m/s	0.01–0.03 per pass	0.01–0.05	Flood (high flow)

✅ Top Machining Tips for Hastelloy G30

Always use sharp tools — inspect and replace inserts after every 2–3 passes to avoid BUE formation from worn edges.
Never stop feed mid-cut — if the machine stops, withdraw the tool before stopping the spindle to prevent work-hardening the surface.
Use positive rake angle inserts (γ = +7° to +15°) to reduce cutting forces and heat generation.
For deep holes, use peck drilling with through-spindle high-pressure coolant — G30 chips are tough and stringy; clear chips frequently.
Our Jiangyin CNC machining center gets surface roughness Ra ≤ 1.6 μm and dimensional tolerance ±0.02 mm on Hastelloy G30 forgings as standard.

International Standards & Equivalent Grades for Hastelloy G30 (UNS N06030)

Hastelloy G30 (Alloy G-30) is covered by a range of international material standards. Use the following table for procurement, documentation, and compliance reference:

Table 13: Hastelloy G30 (UNS N06030) — International Standards Reference Table
Standard	Organization	Product Form	Designation/Grade
UNS N06030	ASTM / SAE (USA)	Unified Number System (all forms)	N06030
ASTM B564	ASTM (USA)	Forgings	UNS N06030
ASTM B619	ASTM (USA)	Welded pipe	Grade 30 (N06030)
ASTM B626	ASTM (USA)	Welded tubes	Grade N06030
ASTM B582	ASTM (USA)	Sheet, strip, plate	Grade N06030
ASTM B620	ASTM (USA)	Seamless pipe	Grade N06030
AMS 5938	SAE/AMS (USA)	Sheet, strip, plate	Alloy G-30 (N06030)
DIN 17744	DIN (Germany)	Wrought alloys (general)	NiCr29Fe15Mo5W — equivalent
EN ISO 15156-3	ISO/EN (Europe)	Sour service alloy qualification	Ni-alloy, Table A.2
NACE MR0175	NACE (USA)	Sour service (H₂S)	Compliant at ≤ 35 HRC
ASME SB-564	ASME (USA)	Pressure vessel forgings	UNS N06030 (BPVC Sect. VIII)
ASME SB-619	ASME (USA)	Pressure vessel pipe	UNS N06030
API 6A / API 6D	API (USA)	Wellhead & pipeline forgings	Per material class table (PSL 1–4)
EN 10204 3.1 / 3.2	CEN (Europe)	Material test certification	Mill Test Report with third-party witness
JIS B 8268	JIS (Japan)	Pressure vessel components	Referenced under nickel alloy class

Material Selection Guide — Hastelloy G30 vs. G-3 vs. C276 vs. Alloy 625 vs. Alloy 825 vs. 2205 Duplex

The following extended comparison helps procurement engineers and materials engineers choose the right alloy for their specific application. Use this table together with the corrosion rate data above for a complete selection decision:

Table 14: Full Material Comparison — Hastelloy G30 (N06030) vs. Key Competitive Alloys
Property / Feature	Hastelloy G30 (N06030)	Alloy G-3 (N06985)	C276 (N10276)	Alloy 625 (N06625)	Alloy 825 (N08825)	2205 Duplex (S32205)
Chromium Content	28–31.5%	22%	14.5–16.5%	20–23%	19.5–23.5%	22–23%
Molybdenum Content	4–6%	6–8%	15–17%	8–10%	2.5–3.5%	3–3.5%
Phosphoric Acid Resistance	★★★★★ Best	★★★☆☆	★★☆☆☆	★★★☆☆	★★☆☆☆	★☆☆☆☆
Oxidizing Acid (HNO₃) Resistance	★★★★★ Best	★★★☆☆	★★☆☆☆ (poor)	★★★★☆	★★★☆☆	★★★☆☆
Reducing Acid (HCl) Resistance	★★★★☆	★★★☆☆	★★★★★ Best	★★★★☆	★★☆☆☆	★★☆☆☆
Weld HAZ Sensitization Resistance	★★★★★ Best	★★★★☆	★★★☆☆	★★★★★	★★★☆☆	★★★★☆
Post-Weld Heat Treatment	Not required	Usually not required	Often required	Not required	Recommended	Not required
SCC Resistance (Chloride)	Excellent	Excellent	Excellent	Excellent	Moderate	Moderate (<150°C)
Max Service Temp (corrosion)	427°C (800°F)	425°C (800°F)	371°C (700°F)	816°C (1500°F)	400°C (752°F)	300°C (572°F)
Tensile Strength (min)	586 MPa	621 MPa	690 MPa	827 MPa	586 MPa	620 MPa
F⁻ / Cl⁻ Impurity Tolerance	★★★★★ Best	★★★☆☆	★★☆☆☆	★★★☆☆	★★☆☆☆	★☆☆☆☆
Relative Material Cost	Medium-High	Medium-High	High	Very High	Medium	Medium-Low
NACE MR0175 Sour Service	✓ Compliant	✓ Compliant	✓ Compliant	✓ Compliant	✓ Compliant	Limited (T < 150°C)
Best Application	Phosphoric acid, mixed oxidizing acids, wet-process H₃PO₄, fertilizer plants	Chemical processing, general corrosion	HCl, reducing acids, chloride environments	Cryogenic, high-temp, seawater, aerospace	Moderate acid, oil & gas pipelines, general corrosion	Mild to moderate acids, seawater, general chemical

ℹ️ Quick Alloy Selection Guide

Choose Hastelloy G30 (N06030) if your primary concern is: phosphoric acid (any concentration), mixed oxidizing acids (HNO₃/H₂SO₄), fluoride/chloride-contaminated acid media, or you need PWHT-free welding performance.
Choose C276 (N10276) if your primary concern is: high-concentration HCl, strong reducing acids, or mixed H₂S/HCl sour gas environments (where Mo content is more important than Cr).
Choose Alloy 625 (N06625) if your application needs: temperatures above 427°C, cryogenic service, very high strength, or seawater resistance.
Choose Alloy 825 (N08825) if your budget is more constrained and the service conditions are moderate (lower acid concentrations, lower temperatures).
Choose 2205 Duplex (S32205) only for ambient to 150°C service in mild acids, seawater, or brine — never for oxidizing strong acids or high-temperature service.

Industry Applications & Proven Case Studies — Jiangyin Made Hastelloy G30 Forging Parts

Our UNS N06030 Alloy G-30 forged parts are proven in service across the most demanding industrial environments around the world. Below are representative case studies from our project history:

Oil & Gas — Upstream & Midstream (Sour Service)

As a leading nickel alloy forging supplier based in Jiangyin China, we have provided custom Hastelloy G30 forgings for oil and gas equipment used in high‑sour gas field projects across the Middle East (Saudi Arabia, UAE, Kuwait), North America (USA, Canada), and Southeast Asia (Malaysia, Indonesia).In these harsh environments with H₂S up to 30 mol%, CO₂ up to 15 mol%, and chloride levels as high as 250,000 ppm, regular carbon steel and 316L stainless steel quickly suffer from hydrogen embrittlement and sulfide stress cracking (SSC) within just a few months.

📋 Case Study 1: Sour Gas Wellhead Forgings — Permian Basin, USA

Client:: Major oil and gas operator (name withheld per NDA)
Application:: Wellhead API 6A casing head, tubing head, and flange forgings for H₂S-bearing sour gas wells
Material:: Hastelloy G30 (UNS N06030) open die forgings, annealed, ≤ 22 HRC per NACE MR0175
Parts Supplied:: Casing head bodies, tubing head bodies, flange ring blanks — 18 sets, total weight 8.5 tons
Standards:: API 6A PSL 3G, NACE MR0175 / ISO 15156 Part 3, EN 10204 3.2 with DNV witness
Delivery:: 38 working days from PO (including DNV witness inspection and expedited air freight)
Result:: Parts have been in production service for more than 3 years with zero corrosion anomaly. Previous 316L SS wellhead needed replacement every 14–18 months. G30 parts reduced maintenance frequency by over 80%.

Chemical & Petrochemical Processing (Phosphoric Acid)

Our Hastelloy G30 chemical processing forgings have been applied in commercial wet-process phosphoric acid (WPA) production lines, fertilizer plants, nitric acid facilities, and specialty chemical plants for global top-500 chemical enterprises in Germany, USA, Brazil, and China.

📋 Case Study 2: Wet-Process Phosphoric Acid Heat Exchanger Tube Sheets — North America

Client:: Major North American phosphate fertilizer producer (name withheld per NDA)
Application:: Heat exchanger tube sheets for wet-process phosphoric acid (WPA) concentration unit — 68–72% H₃PO₄ at 85°C, containing 0.3–0.5% F⁻ and 500–800 ppm Cl⁻
Material:: Hastelloy G30 (UNS N06030) forged tube sheets, solution annealed, with 100% UT per ASME SA-388
Parts Supplied:: 4 × forged tube sheets, 1800mm OD × 120mm thick, with 642 drilled tube holes, total weight 9.8 tons
Previous Material:: 316L stainless steel — needed replacement every 18–24 months due to pitting and crevice corrosion in fluoride/chloride-contaminated H₃PO₄
Result:: After 42 months in service, zero corrosion defect detected during scheduled shutdown inspection. Maintenance frequency reduced by over 45%. Estimated lifetime extension to 8–10 years vs. 18–24 months for 316L SS. Client has since standardized on G30 for all WPA heat exchanger tube sheets.

📋 Case Study 3: Nitric Acid Reactor Components — Germany

Client:: European specialty chemical company (name withheld per NDA)
Application:: Reactor nozzle forgings and flange blanks for concentrated nitric acid (60% HNO₃) production at 110°C
Material:: Hastelloy G30 (UNS N06030), EN 10204 3.2 with TÜV Rheinland witness
Parts Supplied:: 12 × forged nozzle flanges and 6 × forged blind flanges, DN200–DN600, total 3.2 tons
Standards:: EN 13480 (industrial piping), PED 2014/68/EU, EN 10204 3.2
Result:: First inspection after 30 months showed corrosion rate < 0.05 mm/year in 60% HNO₃ at 110°C — consistent with laboratory immersion test data. Zero SCC or crevice corrosion observed.

Nuclear Power & Thermal Power Generation

We supply Alloy G-30 nuclear grade forgings for nuclear power reactor coolant systems and thermal power plants across Asia (China, Pakistan, Vietnam). They all meet ASME BPVC Section III and RCC-M nuclear safety standards. All parts are tested by ultrasonic testing (UT) with SNT-TC-1A Level II certified operators, and full traceability documentation from melt heat to finished product are available.

General Industrial & Rotating Equipment

Our UNS N06030 forged rotating parts serve gas compressors, centrifugal pumps, turbomachinery, and industrial fluid systems for clients in Europe, Australia, and India. Core products: compressor rotors, shrouded impellers, pump casings, impellers, shafts, and wear rings — with precision dynamic balancing and full mechanical performance testing. Request Industry-Specific References

Compliance & Certifications — Hastelloy G30 Forgings from Jiangyin, China

ISO 9001:2015 — Quality Management System Certification (certified by accredited body; certificate available on request)
API 6A Standard Compliance — Our forged parts for wellhead applications are made based on API 6A dimensional and material requirements; buyers needing API 6A-stamped assemblies should specify this at inquiry stage
In-House Testing Laboratory — Full chemical (OES spectrometer) and mechanical testing capability; third-party ISO 17025 accredited lab inspection available on request
NACE MR0175 / ISO 15156 — Sour Service Compliance (H₂S environments), with hardness documentation
EN 10204 3.1 / 3.2 — Mill Test Certificate capability; third-party witness by TÜV/DNV/SGS/BV is available
ASME BPVC Section VIII & Section III — Products are made to meet ASME material and dimensional standards; ASME code-stamped assemblies need a licensed ASME manufacturer
PED 2014/68/EU Compatible — Material supply meeting EU pressure equipment directive material requirements; PED module certification must be performed by the end equipment manufacturer
RCC-M Compatible Materials — Material chemical and mechanical properties meeting RCC-M nickel alloy specifications; nuclear code qualification must be performed by the licensed nuclear manufacturer
Fully meet ASTM, AMS, DIN, EN, JIS, and GOST international standards

Advanced Manufacturing & Quality Control at Our Jiangyin, China Factory

Our 80,000 m² production base in Jiangyin, Jiangsu, China provides a full range of service for your Hastelloy G30 forgings — from raw material receipt to final dimension test before crating. Our factory is a 2-hour drive from Shanghai Port, guaranteeing fast global logistics.

Precision Forging Production Equipment

6 mobile hearth heating furnaces (10 t to 80 t capacity) with centralized automatic heating cycle control — optimized for nickel alloy heating protocols to prevent grain growth and surface oxidation
6,300-ton semi-automatic hydraulic forging press, 4,000-ton hydraulic press, 2,000-ton fast forging machine — deformation control to guarantee consistent fine-grained matrix and eliminate internal defects in Hastelloy G30
70 t, 36 t, 24 t, and 12 t high-precision forging manipulators for heavy operations
1 m and 5 m seamless ring rolling machines for Alloy G-30 forged rings up to 6 m outer diameter
Full CNC machining center with dimensional tolerance to ±0.02 mm

Controlled Heat Treatment Equipment

21 gas furnaces (20 t to 80 t capacity, max length 16 m) with precise temperature control (±5°C) — fully meet AMS 2750 pyrometry requirements
1 electric furnace (20 tons max) for high-precision heat treatment of nuclear and aerospace parts.
4 quenching tanks (110 m³ to 200 m³) with automatic circulation and temperature monitoring — optimized for nickel alloy solution anneal quenching (< 3 min transfer time)
All furnaces: centralized computer-controlled programming with full heat treatment cycle recording (chart recorders + digital data logger) for 100% batch traceability

Full-Scope Quality Inspection & Testing Equipment

ISO 17025 certified chemical analysis lab — OES (optical emission spectrometer) for precise composition verification of every heat
Full mechanical testing lab: universal tensile testing machine (1000 kN), Charpy impact testing (–196°C to +300°C), Brinell/Rockwell/Vickers hardness
Professional metallographic lab: macro/micro structure examination, grain size rating (ASTM E112), inclusion rating (ASTM E45)
UT (ASTM A388/SA-388), MT (ASTM E709), PT (ASTM E165), LP testing by SNT-TC-1A Level II certified operators
Certified 3D coordinate measuring machine (CMM) for dimensional verification to ±0.02 mm

Custom Alloy G-30 (UNS N06030) seamless rolled forged rings up to 6m outer diameter — Jiangyin, China factory

Packaging, Export Preparation & Shipping for Hastelloy G30 Forgings

Proper packaging is important for heavy, high-value Hastelloy G30 forged parts during international ocean or air freight. Our standard export packaging exceeds ASTM D4169 and ISPM 15 requirements:

Standard Packaging Specification

Table 15: Export Packaging Specification for Hastelloy G30 Forgings
Item	Specification
Anti-Rust Treatment	All machined surfaces: rust-preventive oil (VCI — Vapor Corrosion Inhibitor) coating. Flanged faces: protective polyethylene covers. Internal bores: VCI poly bags sealed.
Thread Protection	All threaded portions: plastic thread protectors + VCI foam wrap. Critical sealing surfaces: individual rigid plastic covers.
Individual Wrapping	Each piece wrapped in VCI poly film, then bubble wrap for impact protection. Individual PE bags for small parts.
Heavy Pieces (> 500 kg)	ISPM 15 fumigated wooden crates with steel angle iron reinforcement. Lifting rings welded to crate for crane handling. Load-spreading base runners. Steel banding over crate exterior.
Light to Medium Pieces (< 500 kg)	ISPM 15 fumigated wooden boxes or reinforced plywood cases. Internal blocking and bracing with EPE foam. Steel strapping.
Marking	Each piece/crate marked with: Part No., Heat No., Weight (kg/lb), Gross Weight, Dimensions (L×W×H mm), Shipping Marks, Handle with Care, This Side Up, Center of Gravity marking. Stenciled in English.
Documentation in Package	Packing list (inside waterproof pouch), EN 10204 3.1 MTC copy, dimensional inspection report copy. Originals shipped separately by courier.
Moisture Control	Silica gel desiccant (1–3 kg per crate depending on volume). VCI paper interleaving for stacked parts.

Shipping & Logistics

Port: Shanghai Port (Yangshan Deep-Water Port) — 2-hour drive from our Jiangyin factory
Incoterms: FOB Shanghai (most common), CIF, CFR, EXW Jiangyin, DDP (destination)
Ocean Freight Transit Times: North America (West Coast): 15–18 days | North America (East Coast): 25–30 days | Northern Europe (Rotterdam/Hamburg): 22–28 days | Middle East (Dubai/Jeddah): 12–18 days | Southeast Asia (Singapore/KL): 7–10 days | Australia (Sydney/Melbourne): 15–20 days
Air Freight: Available for urgent small orders (typically < 500 kg) — 2–5 days to most destinations. DHL/FedEx for documents and small samples.
Export Documentation: Commercial Invoice, Packing List, Bill of Lading, EN 10204 3.1/3.2 MTC, Certificate of Origin (China CCPIT or CO for FTA countries), NACE hardness reports, NDT reports, dimensional reports
Customs Classification: HS Code 7326.90 or 7326.19 (steel/nickel forgings) — our freight team provides full customs support

Client Feedback & Project References

ℹ️ About Our Project References

Due to confidentiality agreements with our clients, we cannot publish individual client or company names publicly. Below are representative feedback summaries based on real project communications, shared with client approval and fully anonymized in line with NDA requirements. Prospective customers may request formal reference letters or arrange a factory visit — please contact us for details.

"Valve body forgings in UNS N06030 for a sour gas project. EN 10204 3.1 MTCs provided on time, dimensional tolerance within ±0.05 mm on all important faces. Third-party witness by SGS passed without NCR. Delivery 38 days from PO — on schedule."

Procurement Manager, Oil and Gas Operator

North America, 2024 — (Name and company withheld per NDA)

"Heat exchanger tube sheets for wet-process phosphoric acid plant. Full MTRs provided (chemical, tensile, hardness, UT). After 18 months in service, zero corrosion anomaly detected. Excellent technical support throughout the project."

Materials Engineer, Chemical Plant

Europe, 2025 — (Name and company withheld per NDA)

"API 6A-compatible wellhead parts in UNS N06030. NACE MR0175 compliance documents and hardness test reports all provided. Our inspection team visited the Jiangyin factory and witnessed the UT process — very professional."

Project Engineer, Oil and Gas Contractor

Middle East, 2024 — (Name and company withheld per NDA)

Frequently Asked Questions — Hastelloy G30 (Alloy G-30, UNS N06030) Forging Parts

What is Hastelloy G30 (UNS N06030)?

Hastelloy G30 (UNS N06030, also called Alloy G‑30) is a high‑performance nickel‑chromium‑iron‑molybdenum‑copper superalloy designed for excellent corrosion resistance in oxidizing acid environments — especially commercial phosphoric acid with fluoride and chloride impurities.Key specifications: Cr 28–31.5% (the highest in the G‑series), density 8.22 g/cm³, ultimate tensile strength ≥ 586 MPa, yield strength ≥ 241 MPa, elongation ≥ 30%, maximum operating temperature 427°C (800°F).It provides 30–40% better resistance to pitting and crevice corrosion than the earlier Alloy G‑3, and can usually be used in the as‑welded condition without post‑weld heat treatment.

What is the corrosion rate of Hastelloy G30 in phosphoric acid?

In 85% phosphoric acid (H₃PO₄) at 80°C, Hastelloy G30 has a corrosion rate of about 0.02–0.05 mm/year, which is rated "Excellent" (below 0.1 mm/year).In commercial wet-process phosphoric acid (68–72% H₃PO₄) at 80°C containing 0.3% fluoride and 500 ppm chloride impurities, G30 shows a corrosion rate of 0.04–0.08 mm/year. By comparison, Alloy G-3 reaches 0.12–0.18 mm/year, and 316L stainless steel is 1.5–3.0 mm/year.Refer to the complete corrosion rate tables above for detailed values across different concentrations and temperatures.

What is the recommended welding procedure for Hastelloy G30?

Primary method: GTAW (TIG). Filler: ERNiCrMo-11 (AWS A5.14). Preheat: Not needed. Interpass temperature: Maximum 120°C (250°F). Shielding gas: 100% Argon (≥ 99.99% purity). Post-weld heat treatment: Generally NOT needed — G30 can be used in the as-welded condition for most chemical process applications due to Nb+Ta carbide stabilization. Heat input: 0.5–1.5 kJ/mm (low to medium). Never use carbon steel brushes or tools on G30 surfaces. If PWHT is specified: solution anneal at 1120–1175°C + water quench. See the full welding guide section above for complete parameters and critical warnings.

What is the heat treatment specification for Hastelloy G30 forgings?

Standard heat treatment for Hastelloy G30 (UNS N06030) forgings:Solution annealing at 1120–1175°C (2050–2150°F), holding at least one hour for every 25 mm of section thickness, then rapid water quenching with transfer time from furnace to water under 3 minutes. This process dissolves all carbides, fully reforms the grain matrix, and restores the highest possible corrosion resistance.Hastelloy G30 cannot be hardened by precipitation — it is only strengthened through solid solution.Hot forging temperature range: minimum 980°C (reheat if lower) and maximum starting temperature 1230°C.

What is the difference between Hastelloy G30 and Alloy G-3?

Hastelloy G30 is a major improvement over Alloy G-3. The main differences are: G30 has a much higher chromium content at 28–31.5%, compared to only 22% in G-3, which is why it resists oxidizing acids much better. G30 also includes Nb+Ta at 0.3–1.5%, which G-3 does not have. This stops weld heat-affected zones from becoming sensitive to corrosion and lets G30 be used right after welding without post-weld heat treatment. G30 also has better balanced amounts of molybdenum, copper, and tungsten. In wet-process phosphoric acid with fluoride and chloride impurities, G30 corrodes 3 to 6 times slower than G-3. In tests for weld heat-affected zone sensitivity, G30 performs well while G-3 only shows borderline results. G30 is clearly the better choice for the toughest phosphoric acid and mixed oxidizing acid applications.

How does Hastelloy G30 compare to Alloy 625 and Alloy 825?

Compared to Alloy 625 (N06625):G30 resists oxidizing acids better, especially phosphoric acid and nitric acid, because it has a higher chromium content. Alloy 625 has much more molybdenum at 8–10% and higher niobium content, which gives it better strength at high temperatures up to 816°C, better performance in cryogenic conditions, and better resistance to reducing acids. Alloy 625 is also significantly more expensive. Choose G30 for acidic corrosive environments, and choose 625 for high-temperature, cryogenic, or very high-strength applications.
Compared to Alloy 825 (N08825):G30 offers much better resistance to oxidizing acids, with chromium at 28–31.5% versus 19.5–23.5% in 825, and much better resistance to stress corrosion cracking in chloride environments. Alloy 825 is a lower-cost choice only for mild service conditions and is not suitable for high-concentration phosphoric acid or nitric acid.

What is the maximum size for Hastelloy G30 forgings from your Jiangyin factory?

Jiangsu Liangyi Co., Limited produces the following forgings:Forged bars up to 2000 mm in diameter and 15 m in length; seamless rolled rings up to 6 m outer diameter with a single-piece weight of 30 tons; forged discs and tube sheets up to 4000 mm in diameter and 500 mm thick; hollow forgings up to 3000 mm in outer diameter. Single-piece weight ranges from 30 kg to 35 tons.All products are made strictly according to customer drawings and technical requirements, and CNC machining with a tolerance of ±0.02 mm is available.

What certifications do your Hastelloy G30 forgings have?

Jiangsu Liangyi Co., Limited is certified to the ISO 9001:2015quality management system.Our products meet NACE MR0175 / ISO 15156 material requirements for sour service applications, including hardness test documentation.We issue EN 10204 3.1 mill test certificates as standard. EN 10204 3.2 third‑party witnessed inspection is available upon request, including SGS, BV, DNV, or your designated inspector.We manufacture to all major material standards: ASTM, AMS, DIN, EN, JIS, and GOST.

What is the physical density of Hastelloy G30 (UNS N06030)?

Hastelloy G30 (Alloy G-30, UNS N06030) has a density of 8.22 g/cm³ (0.297 lb/in³) at room temperature.Other main physical properties include an elastic modulus of 196 GPa (28.4 × 10⁶ psi), thermal expansion coefficient of 13.1 μm/(m·°C) from 24 to 100°C, thermal conductivity of 11.3 W/(m·K) at 24°C, melting range of 1315–1355°C (2400–2470°F), and electrical resistivity of 1.17 μΩ·m.For the full list of physical properties, refer to the table in Section 5 above.

What are the machining challenges for Hastelloy G30 and how do you overcome them?

Hastelloy G30 is about 2 to 3 times harder to machine than carbon steel. This is because it hardens quickly when worked, has high strength at high temperatures, tends to build up material on cutting tools, and has low thermal conductivity that traps heat at the tool tip. To machine it properly, use sharp PVD TiAlN coated carbide inserts. Recommended turning speed is 30–80 m/min, feed rate 0.05–0.35 mm/rev, and high-pressure coolant of at least 70 bar through the spindle for drilling. Never stop feeding during a cut, keep a constant depth of cut to avoid the work-hardened surface layer, and change inserts often. Our CNC machining center in Jiangyin can achieve a surface finish of Ra ≤ 1.6 μm and ±0.02 mm tolerance on G30 parts as standard. For full details, see the machining guide in Section 10 above.

What is the delivery time and how do I order Hastelloy G30 forgings from China?

Standard delivery for custom forgings is 25–45 working days from the purchase order, and expedited production is available.Ocean shipping from Shanghai Port takes 15–18 days to the North America West Coast, 25–30 days to the North America East Coast, 22–28 days to Northern Europe, 12–18 days to the Middle East, and 7–10 days to Southeast Asia.To place an order, email your drawings, material specification (UNS N06030), quantity, and project requirements to sales@jnmtforgedparts.com or send a WhatsApp message to +86-13585067993.Our team will reply with a competitive quotation within 24–48 hours.Available Incoterms include FOB Shanghai, CIF, CFR, EXW, and DDP.

How to Order Custom Hastelloy G30 (Alloy G-30, UNS N06030) Forgings from Jiangyin, China

Jiangsu Liangyi Co., Limited is your trusted Jiangyin, China based Hastelloy G30 forging manufacturer, with more than 25 years of experience delivering high-quality nickel alloy forged parts to many clients around the world. Our bilingual technical team provides full project support from material selection and forging design optimization to delivery and documentation.

Submit Inquiry: Email detailed drawings (PDF/DWG/STEP), material spec (UNS N06030 / ASTM B564), quantity, required standards (API 6A / NACE / ASME / EN), and delivery deadline to sales@jnmtforgedparts.com or WhatsApp +86-13585067993.
Technical Review & Quotation: Our engineering team reviews and responds within 24–48 hours with a competitive quotation plus design optimization suggestions (forging shape, heat treatment, testing plan) to improve performance and reduce cost.
Order Confirmation & Production Scheduling: Sign the PO and material specification. Make advance payment. We procure certified Hastelloy G30 raw material (with incoming MTC) and schedule production with full material traceability from day 1.
Manufacturing, QC & Inspection: Forge → heat treat → machine → inspect per approved ITP (Inspection & Test Plan). Full inspection reports (chemical, mechanical, NDT, dimensional) are provided for your approval before shipment. Third-party witness inspection by TÜV, DNV, SGS, BV, or your inspector is coordinated at this stage.
Shipping, Documentation & Delivery: Export-packed per ISPM 15. Ship from Shanghai Port. Full documentation package: EN 10204 3.1/3.2 MTC, packing list, commercial invoice, Certificate of Origin, Bill of Lading, NDT reports, dimensional reports. FOB, CIF, CFR, EXW, DDP available.

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Chengchang Industry Park, Jiangyin City, Jiangsu Province, China 214400
(2-hour drive to Shanghai Port)

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