Hastelloy C22 (Alloy C-22, UNS N06022) Forging Parts | China Professional Manufacturer
What is Hastelloy C22 (UNS N06022)?
Hastelloy C22 (trade designation by Haynes International, Inc.; UNS N06022; EN 2.4602) is a nickel-chromium-molybdenum-tungsten alloy that resists both oxidizing and reducing corrosive materials very well. It contains 20–22.5% Cr, 12.5–14.5% Mo, and 2.5–3.5% W, which gives it a Pitting Resistance Equivalent Number (PREN) value of about 65 — one of the highest among commercial nickel alloy. Its very low carbon content of no more than 0.015% greatly reduces carbide formation during welding, so it resists welding-related damage much better than Hastelloy C276. Hastelloy C22 fully meet NACE MR0175 / ISO 15156 standards for sour service and ASTM B564 standards for forgings.
| UNS / EN designation | N06022 / 2.4602 | Density | 8.69 g/cm³ |
| Ni content | Balance (~56%) | Melting range | 1,357–1,399 °C |
| Cr content | 20.0–22.5% | PREN value | ~65 (highest in class) |
| Mo content | 12.5–14.5% | Min. yield strength | 310 MPa (45 ksi) |
| W content | 2.5–3.5% | Min. tensile strength | 690 MPa (100 ksi) |
| Max C content | 0.015% | Min. elongation | 45% |
| Heat treatment | Solution anneal 1,105–1,135 °C + water quench | Hardness (typical) | ≤ 100 HRB |
| Key standards | ASTM B564, NACE MR0175/ISO 15156, EN 10204 | Max forging weight | 30 tons (single piece) |
About Hastelloy C22 (UNS N06022) Forgings
Jiangsu Liangyi Co., Limited is a professional ISO 9001:2015 certified manufacturer of high-performance Hastelloy C22 (also known as Alloy C-22, UNS N06022) open die forging parts and seamless rolled forged rings, located in Jiangyin, Jiangsu Province — China’s core forging industry belt. Hastelloy C22 is a registered trademark of Haynes International, Inc.; we produce forged parts from this alloy based on ASTM, AMS, API 6A, NACE MR0175, EN, DIN and other international standards. With over 25 years of nickel alloy forging experience, we provide a full range of service for custom Hastelloy C22 forged products , from premium steel melting, forging, standardized heat treatment to final CNC machining, strictly based on your drawings and technical requirements.
Our Hastelloy C22 forging parts are exported to more than 50 countries across North America, Europe, the Middle East, Southeast Asia, Australia and South America, they are used for oil and gas, nuclear power, chemical processing, power generation, marine and offshore and other extreme industries that demand excellent corrosion resistance and high structural reliability.
Need custom Hastelloy C22 (Alloy C-22, UNS N06022) forging parts? Send your drawings and specifications for a free quotation within 24 hours!
Contact Us NowFull Range of Hastelloy C22 Forged Product Shapes & Specifications
We manufacture a complete portfolio of Hastelloy C22 (Alloy C-22, UNS N06022) forged steel products in all kinds of custom shapes and sizes, with single-piece weight ranging from 30 kg to 30 tons. Our core product range includes, but is not limited to:
Product Shape & Size Capability Summary Table
The table below shows our real in-house production capacity as of 2026, confirmed by finished customer orders. Unlike the general specifications shown by trading companies, all size limits listed have been reached in actual production with complete quality records.
| Product Shape | Max. Outer Diameter / Cross-Section | Max. Length / Height | Max. Single-Piece Weight | Typical Tolerance |
|---|---|---|---|---|
| Round Bar / Rod | Ø 2,000 mm | 15,000 mm | 15 tons | ± 2 mm (rough); ± 0.05 mm (CNC) |
| Seamless Rolled Ring | Ø 6,000 mm | Height 1,500 mm | 30 tons | ± 3 mm OD/ID; ± 2 mm height |
| Forged Disc / Plate | Ø 3,000 mm | Thickness 800 mm | 20 tons | ± 3 mm (rough); ± 0.1 mm (CNC) |
| Hollow Forging / Sleeve | OD Ø 3,000 mm | Length 8,000 mm | 18 tons | Wall thickness ± 5% or ± 3 mm |
| Square / Flat Bar | Max. 800 × 800 mm | 8,000 mm | 8 tons | ± 2 mm |
| Step Shaft / Gear Shaft | Max. step Ø 1,500 mm | 10,000 mm | 12 tons | ± 0.05 mm (CNC finished) |
| Custom Complex Shape | Per drawing | Per drawing | 30 tons | Per drawing requirement |
Hastelloy C22 Forged Bars & Rods
We provide custom Hastelloy C22 forged round bars, square bars, flat bars, rectangular bars, step rods and gear shafts. All bars are 100% UT inspected and supplied with EN 10204 3.1/3.2 certification as standard. They are the best choice material for valve stems, pump shafts, drilling tools and mechanical parts. Explore our full range of forged bars.
Hastelloy C22 Seamless Rolled Forged Rings
We provide custom Hastelloy Alloy C22 seamless rolled rings and open die forged rings. We produce gear rings, flange blanks, valve body rings, bearing races and contoured rolled rings. All products fully meet API 6A and ASME standards. Learn more about our seamless rolled rings manufacturing capabilities.
Hastelloy C22 Hollow Forgings & Sleeves
We provide alloy C-22 forged hubs, housings, shells, sleeves, bushes, casings and heavy-wall hollow bars, with outer diameter up to 3,000 mm. Our seamless hollow forgings delete weld defects and deliver consistent grain matrix throughout the wall thickness — an important advantage for high-pressure cylinders and wellhead equipment.
Hastelloy C22 Forged Discs, Plates & Blocks
We provide UNS N06022 forged discs, disks, blocks, plates, flanged blanks and boss blanks. All products are checked by non-destructive testing (UT/MT/PT) before delivery, and the are widely used for pressure vessel heads, tube sheets, valve bonnets and flange blanks.
Custom Engineered Hastelloy C22 Forgings
We produce custom Hastelloy C22 forged parts strictly based on your custom drawings, including valve parts, pump parts, turbine parts, wellhead equipment and heat exchanger parts. Our in-house engineering team provides full technical support from material chosen to final machining.
Why Choose Hastelloy C22 (UNS N06022) Forgings?
Hastelloy C22 (also called Alloy C-22, UNS N06022) is a flexible austenitic nickel‑chromium‑molybdenum‑tungsten superalloy. It is widely known as the “all‑around corrosion‑resistant alloy” for the toughest industrial settings. Its special chemical mix gives it better performance than regular stainless steel and other nickel alloys.
- Full-Spectrum Corrosion Resistance: Balanced chromium (20.0–22.5%), molybdenum (12.5–14.5%) and tungsten (2.5–3.5%) delivers excellent resistance to both oxidizing and reducing media, outperforming Hastelloy C276 in oxidizing environments and Alloy 625 in reducing corrosive conditions.
- Superior Localized Corrosion Resistance:It has improved resistance to pitting, crevice corrosion and stress corrosion cracking (SCC), even in chloride-rich, sour service and wet chlorine environments, deleting premature failure in important applications.
- Wide Chemical Compatibility: It has excellent resistance to oxidizing acid chlorides, wet chlorine, formic acid, acetic acid, ferric and cupric chlorides, sea water, brine, and mixed organic/inorganic chemical solutions.
- Excellent Thermal Stability: It has excellent resistance to sensitization during welding and heat treatment, and keeps corrosion resistance in the weld heat-affected zone (HAZ), so that it is the best choice material for fabricated parts and welded assemblies.
- High Mechanical Performance: It can keep excellent strength and toughness even at both cryogenic and elevated temperatures up to 1,093 °C, suitable for extreme temperature fluctuation applications in power generation and aerospace.
Hastelloy C22 Physical Properties
The physical property data below for Hastelloy C22 (UNS N06022) comes from measurements by our in-house metallurgical lab and has been verified with ASTM B574 mill test records from our production batches.Engineers often ignore physical properties when first choosing materials, but these values directly influence thermal design, pipe expansion calculations, and electrical grounding requirements for equipment.
| Property | Value | Unit | Notes |
|---|---|---|---|
| Density | 8.69 | g/cm³ | Used for weight estimation of forged blanks |
| Melting Range | 1,357 – 1,399 | °C | Solidus to liquidus; governs VIM/VAR melting parameters |
| Specific Heat Capacity | 414 | J/(kg·K) | At 20 °C |
| Thermal Conductivity | 11.1 | W/(m·K) | At 100 °C; increases to ~16.3 at 500 °C |
| Mean Coeff. of Thermal Expansion | 12.4 | 10&sup6; /°C | 20–100 °C; critical for flange assembly gap calculations |
| Mean CTE at 20–500 °C | 13.8 | 10&sup6; /°C | For high-temperature piping expansion joint design |
| Electrical Resistivity | 1.14 | μΩ·m | At 20 °C |
| Young’s Modulus (Modulus of Elasticity) | 211 | GPa | At room temperature |
| Poisson’s Ratio | 0.30 | — | Standard value for FEA structural analysis |
| Magnetic Permeability | < 1.002 | μr | Essentially non-magnetic; suitable for MRI-adjacent equipment |
Jiangsu Liangyi Engineer Note: One property our clients often underestimate is the relatively low thermal conductivity of Hastelloy C22, compared to carbon steel at around 50 W/m·K. In heat exchanger tube sheet designs, this difference means thinner sheet layouts or corrugated surface treatments are needed to make up for it. Our engineering team can advise on this balance when we prepare your quotation.
Hastelloy C22 High-Temperature Mechanical Properties
Room-temperature mechanical properties are not enough for parts used at high temperatures.The table below shows the mechanical properties of Hastelloy C22 (UNS N06022) over the full operating temperature range used in oil & gas, chemical, and power generation applications.These values apply to material in the solution‑annealed condition according to ASTM B564 and match test records from our production batches.
| Test Temperature | 0.2% Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|
| Room Temperature (20 °C) | ≥ 310 | ≥ 690 | ≥ 45 | ≥ 50 |
| 100 °C | ~280 | ~660 | ~46 | ~52 |
| 200 °C | ~260 | ~630 | ~43 | ~52 |
| 300 °C | ~240 | ~600 | ~42 | ~50 |
| 400 °C | ~225 | ~570 | ~40 | ~49 |
| 500 °C | ~215 | ~545 | ~38 | ~47 |
| 600 °C | ~205 | ~520 | ~36 | ~45 |
| 700 °C | ~195 | ~490 | ~34 | ~42 |
| 800 °C | ~170 | ~420 | ~30 | ~38 |
Application Note from Our Metallurgical Lab: Based on our production experience with Hastelloy C22 forgings used in sour gas wellhead equipment, the most critical design margin choices are made for the 300–500 °C temperature range.At these temperatures, C22 keeps about 70% of its room-temperature yield strength, a clear advantage over 316L stainless steel, which falls below 40% of its room-temperature yield strength at 500 °C.
Hastelloy C22 vs Competing Nickel Alloys: Core Advantages
| Alloy Grade | Core Advantages of Hastelloy C22 | Key Application Difference |
|---|---|---|
| Hastelloy C276 | Better oxidizing media resistance, superior resistance to sensitization during welding | Ideal for mixed oxidizing/reducing environments with frequent welding requirements |
| Inconel 625 | Better overall corrosion resistance, superior pitting/crevice corrosion resistance in chloride-rich environments | Preferred for harsh corrosive chemical processing and sour oil & gas applications |
| Hastelloy B2 | Excellent oxidizing media resistance, no risk of SCC in oxidizing environments | Suitable for mixed acid environments where B2 would suffer rapid corrosion |
| 316L Stainless Steel | Far superior corrosion resistance in all harsh environments, 10+ times longer service life | Replaces 316L in applications where stainless steel fails prematurely due to corrosion |
Explore our full range of nickel alloy forging materials to find the perfect grade for your project.
Hastelloy C22 Material Specifications & Standards
All our Hastelloy C22 (Alloy C-22, UNS N06022) forging parts are made of premium raw material, strictly following international material standards. All parts can be traced from melting to final delivery.
Melting Process Standard
All our Hastelloy C22 forgings use premium double or triple melted alloy via vacuum induction melting (VIM) + vacuum arc remelting (VAR) / electroslag remelting (ESR), guaranteeing ultra-high material purity, consistent chemical composition and mechanical performance, deleting inclusions and segregation that could cause premature failure.
Chemical Composition (ASTM B564 / B574 Standard)
| Element | Content Range (Wt %) | Element | Content Range (Wt %) |
|---|---|---|---|
| Nickel (Ni) | Balance | Cobalt (Co) | 2.5 Max. |
| Chromium (Cr) | 20.0 – 22.5 | Vanadium (V) | 0.35 Max. |
| Molybdenum (Mo) | 12.5 – 14.5 | Carbon (C) | 0.015 Max. |
| Iron (Fe) | 2.0 – 6.0 | Manganese (Mn) | 0.50 Max. |
| Tungsten (W) | 2.5 – 3.5 | Silicon (Si) | 0.08 Max. |
| Phosphorus (P) | 0.02 Max. | Sulfur (S) | 0.02 Max. |
Corrosion Resistance Performance & PREN Analysis
The corrosion resistance of Hastelloy C22 (UNS N06022) is not just a qualitative property; it can be measured and compared to other nickel alloys using standardized corrosion testing methods. The data below is based on tests that follow the ASTM G28 (boiling ferric sulfate-sulfuric acid) and ASTM G48 (pitting and crevice corrosion resistance) methods that we often use in our client qualification reports.
| Alloy | UNS No. | Corrosion Rate (mm/yr) | PREN* (Approx.) | Critical Pitting Temp. °C (ASTM G48C) |
|---|---|---|---|---|
| Hastelloy C22 | N06022 | < 0.10 | ~65 | > 85 |
| Hastelloy C276 | N10276 | 0.20 – 0.30 | ~69 | > 60 |
| Inconel 625 | N06625 | 0.30 – 0.50 | ~51 | ~55 |
| Hastelloy C2000 | N06200 | < 0.10 | ~57 | ~80 |
| 316L Stainless Steel | S31603 | > 20 | ~23 | ~15 |
*PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3×%Mo + 16×%N. A higher PREN indicates greater resistance to pitting initiation in chloride environments.
What This Data Means for Your Project: Based on our experience supplying C22 forgings to chlor‑alkali plants and offshore desalination facilities, customers who switched from C276 to C22 for oxidizing chloride service reported an average 30–40% lower annual corrosion rate.However, in applications using only strong reducing acids such as pure hydrochloric acid with no oxidizing impurities, C276 may still perform better than C22.Our technical team can analyze your process fluid composition and recommend the most cost‑effective alloy for your needs.
Heat Treatment Standard & Mechanical Properties
Our Hastelloy C22 forgings are given standardized solution annealing at 1,105–1,135 °C, with holding time precisely tailored to product thickness, followed by rapid quenching via water, compressed air or inert gas. The mechanical properties of delivery condition meet or exceed the following ASTM standards:
- Minimum 0.2% Offset Yield Strength: is 310 MPa
- Minimum Ultimate Tensile Strength: 690 MPa
- Minimum Elongation (in 2 in.): 45%
- Hardness: ≤ 100 HRB (typical delivery condition)
International Standards & Compliance
All our Hastelloy C22 forging parts can be made based on the following international standards, with full certification support:
- ASTM B564 / B574 / B366: Standard Specification is for Nickel Alloy Forgings, Bars and Fittings
- ASME BPVC Section VIII: Boiler and Pressure Vessel Code
- API 6A / 6D: Specification for Wellhead and Christmas Tree Equipment, Pipeline Valves
- NACE MR0175 / ISO 15156: Sour Service Oilfield Equipment Standard
- EN 10204: Metallic Products – Inspection Documents Types 3.1 / 3.2
- DIN, JIS, AMS, RCC-M (Nuclear Industry) and other custom standards
Hastelloy C22 Forging Process & Our Technical Expertise
Hastelloy C22 is a high-alloy nickel superalloy with strict forging process requirements, as improper forging can lead to grain coarsening, residual stress, reduced corrosion resistance and premature parts failure. With over 25 years of nickel alloy forging experience, we have mastered the exclusive forging process for Hastelloy C22, making sure every part has improved performance and long lifetime.
Our Full In-House Hastelloy C22 Forging Process
- Premium Raw Material Melting: VIM+VAR/ESR double/triple melting to guarantee material purity and uniform composition, with full chemical composition inspection before forging.
- Precision Billet Heating: Strict temperature control at 1,175–1,205 °C in electric heating furnaces, with consistent heating and holding time tailored to billet size, avoiding overheating or underheating.
- Controlled Open Die Forging: Forged on our 2,000T–6,300T hydraulic forging presses, with deformation rate control (minimum 3:1 forging ratio) to break down cast matrix, refine grain size and guarantee consistent material flow. Our advanced forging equipment enables us to handle parts up to 30 tons.
- Seamless Ring Rolling: For ring parts, we use our 1M–5M CNC seamless rolling machines to get consistent wall thickness, precise dimensions and consistent circumferential grain matrix.
- Standardized Solution Annealing: Precise temperature control at 1,105–1,135 °C, with full solution treatment followed by rapid quenching to restore corrosion resistance and optimize mechanical properties.
- Precision CNC Machining: In-house 3–5 axis CNC machining centers to get tight dimensional tolerances, with surface finish up to Ra 0.8 µm as needed.
- Full-Process Quality Inspection: All parts are checked by non-destructive testing, chemical composition verification, mechanical property testing and dimensional inspection before delivery.
Our Core Technical Advantages for Hastelloy C22 Forgings
- Provide a full range of service from melting to final inspection, no outsourcing, guaranteeing full quality control and short lead time
- Exclusive forging process parameters for Hastelloy C22, refined grain size, no internal defects, improved corrosion resistance and mechanical performance
- In-house metallurgical lab and engineering team provide full technical support for material selection, forging process design and failure analysis
- Ability to manufacture ultra-large and custom-shaped Hastelloy C22 forgings up to 30 tons, with tight dimensional tolerances
- Provide full certification , including EN 10204 3.2 third-party inspection from TUV, BV, DNV, ABS and other international authorities
Hastelloy C22 Material Selection Guide: When C22 Is — and Is Not — the Right Choice
Choosing the wrong nickel alloy grade is an expensive error our technical team often sees when examining failed parts.Hastelloy C22 is an excellent material, but it is not always the best choice for every corrosive application.This selection guide is based on over 25 years of real project experience and is not found in standard supplier datasheets — it comes from accumulated field feedback from our customers around the world.
Choose Hastelloy C22 When Your Environment Involves:
✓ Mixed Oxidizing & Reducing Media
Process flows that have both oxidizing substances (Fe³+, Cu²+, Cr⁶+, HNO₃) and reducing acids (HCl, H₂SO₄) at the same time or in turns. C22’s balanced mix of chromium, molybdenum and tungsten is specially made to handle both types of corrosion.
Verdict: C22 First Choice
✓ Wet Chlorine & Hypochlorite Environments
Chlor-alkali cells, bleach making, water treatment, and pulp & paper bleaching systems. C22’s higher chromium content gives it a clear advantage over C276 in these oxidizing chloride environments.
Verdict: C22 Preferred over C276
✓ Sour Oil & Gas (NACE MR0175 Service)
Wellheads, valve bodies, tubing hangers and downhole tools used in environments with H₂S and high chloride levels. With a PREN value of about 65 and full NACE compliance, C22 has become the industry standard for these applications.
Verdict: C22 Industry Standard
✓ Fabricated Assemblies with Welding
Parts that need extensive welding such as pressure vessel nozzles, heat exchanger shells and piping spools. C22 is far more resistant to weld sensitization than C276, preserving corrosion resistance in the weld HAZ without mandatory PWHT.
Verdict: C22 Superior to C276
✗ Strongly Reducing Acids Only (Pure HCl)
If your process exclusively involves concentrated, reducing hydrochloric acid without any oxidizing contaminants, Hastelloy B2/B3 (UNS N10665/N10675) has better performance in this narrow niche at a lower alloy cost.
Verdict: Consider B2/B3 Instead
✗ Mildly Corrosive General Service
For equipment handling dilute acids, mild chloride solutions or moderate chemical environments below 60 °C, duplex stainless steels (2205, 2507) or even 316L may provide sufficient protection at significantly lower material cost.
Verdict: Stainless Steel May Suffice
Our Recommendation Process: Before giving a final material recommendation, our team asks clients for three key pieces of information:(1) the full composition of the process fluid, including trace contaminants;(2) the operating temperature range, including any peak temperatures during process upsets;and (3) the required minimum service life.
With just these three details, we can accurately narrow down the best material choice in 90% of cases, without the need for costly corrosion coupon testing.
Hastelloy C22 Weldability, Machinability & Surface Finish Options
Weldability
Hastelloy C22 has excellent weldability compared to other high‑molybdenum nickel alloys, making it highly valuable commercially.Its very low carbon content (≤0.015%) and balanced chromium‑molybdenum‑tungsten composition greatly reduce carbide and intermetallic precipitation during welding, so the heat‑affected zone (HAZ) keeps corrosion resistance nearly as strong as the base metal — a benefit that C276 cannot fully match in multi‑pass welds on heavy sections.
Recommended Welding Practice for Hastelloy C22 Forgings
- Recommended Filler Metal: ERNiCrMo-10 (AWS A5.14) for GTAW/GMAW; ENiCrMo-10 (AWS A5.11) for SMAW. Using matched-composition filler is important — avoid using C276 filler (ERNiCrMo-4) as it introduces compositional dilution that reduces oxidizing media resistance in the weld bead.
- Preheat: Not needed for section thickness ≤ 38 mm. For heavy sections > 100 mm, a moderate warm-up to 50 °C is advisable to remove moisture in the joint.
- Interpass Temperature: Keep below 100 °C to minimize heat accumulation and prevent grain boundary sensitization in multi-pass welds.
- Post-Weld Heat Treatment (PWHT): It is not mandatory for most applications. However, for the most aggressive corrosive services (e.g., nuclear reactor coolant systems), a full solution anneal at 1,105–1,135 °C followed by water quench after welding provides the highest level of corrosion assurance and is recommended by our metallurgical team.
- Shielding Gas: 100% Argon or Argon + 5% Hydrogen for GTAW back-purge; 100% Argon or Ar/He for cover gas. Avoid CO2-containing gas mixtures as they introduce carbon pickup.
Machinability
Hastelloy C22 is an alloy that work-hardens easily, making it much harder to machine than austenitic stainless steels.
Our in-house CNC machining team has optimized toolpaths and cutting parameters through thousands of hours of actual production on C22 forgings — not on bar stock. Forged material behaves very differently under cutting forces because of its fine, consistent grain matrix from controlled forging.Key Machining Parameters (Our In-House Reference)
- Cutting Speed (Turning): 15–30 m/min for roughing; 25–45 m/min for finishing with coated carbide inserts (PVD-TiAlN or TiSiN coating preferred).
- Feed Rate: 0.10–0.25 mm/rev for turning; reduce by 30% for boring operations on thin-wall hollow forgings.
- Depth of Cut: Minimum 0.5 mm to avoid “skating” on the work-hardened surface from the previous pass. Cutting below the work-hardened layer is the single most important machining rule for C22.
- Coolant: High-pressure (70–100 bar) water-soluble oil flood coolant directed at the cutting zone is essential. Dry machining of C22 accelerates tool wear by 5–8 times and risks thermal damage to the part surface.
- Surface Finish Achievable: Ra 12.5 µm (as-forged, shot-blasted); Ra 3.2 µm (rough turning); Ra 1.6 µm (semi-finish); Ra 0.8 µm (finish turning/grinding).
Surface Finish & Post-Processing Options
Based on the needs of the application and the corrosive media that the Hastelloy C22 forged parts will come into contact with, we offer the following surface conditions:
| Surface Condition | Roughness Ra | Typical Application | Available In-House |
|---|---|---|---|
| As-Forged (Scale Removed) | Ra 25–50 µm | Forged blanks for customer further machining | Yes |
| Shot Blasted | Ra 6.3–12.5 µm | Standard delivery for non-sealing surfaces | Yes |
| Rough Machined | Ra 3.2–6.3 µm | Dimensional verification; customer pre-finish | Yes |
| Semi-Finished | Ra 1.6 µm | Bearing surfaces, flange faces | Yes |
| Finish Machined / Ground | Ra 0.8 µm | Valve stems, pump shafts, seal faces | Yes |
| Electropolished | Ra < 0.4 µm | Pharmaceutical, food-grade, ultra-clean process | Subcontracted (QC managed) |
| Passivated (ASTM A967) | Per base machining | Enhanced chloride resistance on machined surfaces | Subcontracted (QC managed) |
Industry Applications & Global Project Cases
Our Hastelloy C22 (Alloy C-22, UNS N06022) forging parts are widely used in important applications across industries that demand excellent corrosion resistance, high pressure tolerance and long lifetime. Below are our main application scenarios and proven project cases around the world.
Oil & Gas Upstream & Midstream Industry
Hastelloy C22 is the best choice material for sour service oil and gas applications. Our forged parts include drill pipes, drill rods, drilling collars, drilling tools, risers, connectors, flexible joints, seals, flanges, gaskets, valve balls, valve bonnets, valve bodies, valve stems, valve seat rings, casing heads, tubing heads, casing hangers, tubing hangers, downhole drilling tool parts, ESP motor shafts and wellhead equipment. All products can be made per API 6A and NACE MR0175 standards for sour service environments.
Project Case: Middle East Large Sour Gas Field Wellhead Equipment Project
Client Challenge: The project needed wellhead parts that could handle high levels of H₂S, CO₂, and chloride ions. These parts had to meet NACE MR0175 and last at least five years.The original parts made of 316L and Inconel 625 broke down in less than a year because they have bad pitting and stress corrosion cracking.
Our Solution: We supplied custom API 6A certified Hastelloy C22 forged casing heads, tubing hangers, gate valve bodies, valve stems and seat rings. We used our own forging and heat treatment process to make these parts so that they are as resistant to corrosion as possible.Before shipping, all parts passed a full NDT inspection and got BV certification from a third party.
Project Outcome: The parts have been working stably for over 4 years, with no corrosion or performance issues, exceeding the client’s service life expectations, and we have become the long-term supplier for the client’s subsequent projects.
Nuclear Power Generation Industry
Our Hastelloy C22 forgings are widely used in nuclear power facilities, including important parts such as reactor coolant pump rotors, impellers, casings, containment seal chambers, and pressure vessel nozzles.All products meet nuclear industry material standards, with strict control over material purity and complete material traceability.
Project Case: European Nuclear Power Plant Reactor Coolant System Upgrade Project
Client Challenge: The nuclear power plant needed to upgrade the parts of its reactor coolant system. This meant that it needed materials that could withstand corrosion in boric acid water environments, had to be certified as nuclear-grade, and had to meet EU RCC-M nuclear safety standards.
Our Solution: We made nuclear-grade Hastelloy C22 forged impellers, pump casings, seal chamber parts, and nozzles from triple-melted raw material that could be traced back to the beginning of the process. We also followed strict nuclear industry standards for inspections.All of the products passed a third-party TÜV inspection and got a nuclear material certification.
Project Outcome: The parts were put in place and worked well. They all met all of the nuclear power plant's safety and performance standards.
Chemical & Petrochemical Processing Industry
Hastelloy C22 is the industry standard for corrosive chemical processing applications. Our forged products include pressure vessel nozzles, heat exchanger tube sheets, baffle plates, channel flanges, boiler shells, reactor parts, venturi cone meter bodies, ultrasonic flow meter bodies, transition cones and piping parts. These products are widely used in chemical plants, petrochemical facilities, fertilizer production, pharmaceuticals, and pulp and paper mills
Project Case: Southeast Asia Large Chlor-Alkali Plant Heat Exchanger Project
Client Challenge: The plant’s heat exchanger tube sheets and flanges were handling wet chlorine and mixed oxidizing acid media, with the original 316L stainless steel components suffering severe corrosion, needing shutdown and replacement every 6 months, resulting in huge production losses.
Our Solution: We made custom Hastelloy C22 forged tube sheets, flanges and nozzles, with full solution annealing and CNC machining,making sure they all had improved corrosion resistance and meet the tight dimensional requirements of the heat exchanger.. All products passed UT inspection per ASTM A388 standard.
Project Outcome: The parts have been in use for more than 24 months without any signs of corrosion. This has extended the equipment's maintenance cycle by four times, which has greatly reduced the client's downtime and maintenance costs.
Power Generation & Turbomachinery Industry
Our Alloy C-22 forged parts are widely used in gas and steam turbine systems, thermal power plants, combined-cycle power plants and renewable energy facilities, including MSV/GV/CV/CRV valve seats, valve cores, valve sleeves, main steam valve bonnets, gas and air compressor rotors, turbo centrifugal compressor impellers, shrouded impellers, turbine main shafts and other important rotating parts.
Project Case: South Korea Combined-Cycle Power Plant Flue Gas Desulfurization & Turbine Component Project
Client Challenge: A big South Korean independent power producer faced rapid corrosion and erosion on Alloy 625 forged impellers and valve bodies in their flue gas desulfurization (FGD) scrubber system.This damage was caused by a mix of dilute H₂SO₄, SO₂, chlorides, and high slurry flow velocities.Parts had to be replaced every 14 months on average, leading to substantial unplanned maintenance costs.Furthermore, the gas turbine main stop valve bonnets handling high-temperature sulfur-containing combustion gas needed an improved alloy solution.
Our Solution: The client's process conditions included fluid pH (1.8–3.5), chloride content (8,000–15,000 ppm), slurry velocity, and operating temperature (55–75 °C). Our engineering team recommended Hastelloy C22 to replace Alloy 625 for the FGD parts and also approved C22 for turbine valve bonnets that work at up to 480 °C.
We made forged C22 slurry pump impellers with a consistent grain matrix that was checked by metallographic cross-section inspection, forged valve bonnets with strict flatness tolerances to make sure they sealed properly, and forged agitator hubs with balanced mass to help control vibrations.All parts were sent in a solution-annealed state and were tested with ultrasonic waves 100% of the time.
Project Outcome: After 30 months of continuous operation, ultrasonic thickness testing showed no measurable corrosion or wall loss on the C22 FGD parts, compared to the 14-month replacement cycle of the original Alloy 625 parts.The client calculated direct maintenance savings of roughly USD 380,000 in the first two years, and later converted their other four FGD units to use C22 forgings in follow-up orders.
Marine & Offshore Industry
Our UNS N06022 forgings are the best choice material for marine and offshore applications, including subsea production systems, offshore platforms, desalination plants, shipboard piping systems and marine exhaust gas scrubbers. They have excellent resistance to sea water corrosion, brine and sour service environments.
Project Case: Norway Offshore Subsea Production System & Open-Loop Marine Scrubber Project
Client Challenge: A Norwegian offshore operator needed to qualify a new material for subsea Christmas tree valve bodies and choke body parts in an ultra‑deepwater (1,800 m) field. The environment featured high H₂S (8 % partial pressure), CO₂ (12 % partial pressure), chloride levels up to 180,000 ppm, combined with extreme external seawater pressure.
Meanwhile, its marine engineering division required large‑diameter forged flange rings for the seawater inlet manifold of an open‑loop exhaust gas cleaning system (scrubber) on a newbuild LNG carrier. During high‑sulfur fuel combustion, seawater pH at the scrubber outlet could drop as low as 2.5.
Our Solution: For the subsea production parts, we produced Hastelloy C22 forged Christmas tree valve bodies and choke bodies certified to NACE MR0175/ISO 15156. Using our proprietary triple-melt VIM+VAR forging process, we got a refined ASTM grain size of 4–6, delivering maximum resistance to sulfide stress corrosion cracking (SSCC) and high low-temperature toughness. Full testing included ASTM G48 Method C (critical pitting temperature > 85 °C) and ASTM G36 stress corrosion cracking tests, with complete documentation provided.
For the marine scrubber flange rings, we manufactured seven large-diameter seamless rolled Hastelloy C22 rings with an outer diameter up to 1,400 mm and wall thickness of 85 mm. All rings were solution annealed, supplied with full dimensional inspection reports, and supported by DNV Type Approval documentation.
Project Outcome: The subsea production system has been installed and operating at the design depth for more than 18 months, with no integrity issues identified during the first scheduled inspection.The marine scrubber flange rings obtained Lloyd’s Register class approval and were fitted on the LNG carrier, which has now completed 12 months of commercial sailing with no corrosion-related maintenance required on the scrubber system.
Looking for a reliable China manufacturer for your Hastelloy C22 forging project? We have more than 25 years of nickel alloy forging experience and global project references!
Get Your Free QuotationQuality Assurance & Inspection Capabilities
As a professional ISO 9001:2015 certified Hastelloy C22 forging manufacturer from Jiangyin, Jiangsu Province, China, we have established a strict full-process quality control system, from raw material incoming inspection to final product delivery, making sure every product meets your requirements and international standards.
Full-Set Inspection Equipment & Capabilities
- Chemical Analysis Lab: In-house direct-reading spectrometer and carbon-sulfur analyzer are used for chemical composition testing of every heat of steel, making sure all parts fully meet material standards.
- Mechanical Property Lab: Use universal tensile testing machine, high-temperature tensile testing machine, impact testing machine, hardness tester and high-temperature creep testing machine, to verify yield strength, tensile strength, elongation, impact toughness and other mechanical properties.
- Metallurgical Lab: In-house metallurgical laboratory has metallographic microscope, for macro-micro structure inspection, grain size analysis and inclusion rating, making sure the material matrix is improved.
- Non-Destructive Testing (NDT): Performs full NDT capabilities including ultrasonic testing (UT), magnetic particle testing (MT), liquid penetrant testing (PT) and radiographic testing (RT) by certified SNT-TA-1A Level II/III operators, to detect internal and surface defects.
- Dimensional Inspection: Use high-precision three-coordinate measuring machine (CMM), height gauge and other certified dimensional control equipment, to make sure all dimensions meet the drawing tolerances.
Certification & Documentation Support
- EN 10204 3.1 Mill Test Certificate (MTC) are supplied as standard for every order
- EN 10204 3.2 Third-Party Inspection Certificate are available from TUV, BV, DNV, ABS, Lloyd’s Register, RINA, RMRS and other international authorities
- Provide full material traceability documentation, heat treatment report, NDT report, chemical composition report and mechanical property report
- We are ISO 9001:2015 certified. API Q1 compliance documentation assistance are available upon request.
Packaging, Lead Time & Global Delivery
We know that for international buyers of industrial forgings, the quality of the packaging, the dependability of the delivery, and the completeness of the paperwork are just as important as the product itself. Based on our standard export procedures that have been fine-tuned over more than 25 years of shipping around the world, here is a clear picture of how we handle every shipment of Hastelloy C22 forging parts from our Jiangyin facility to your destination.
Standard Export Packaging for Hastelloy C22 Forgings
Improper packaging is the leading cause of surface damage and corrosion initiation on high-value nickel alloy forgings during ocean freight. Our packaging process follows a seven-step protocol developed specifically for corrosion-sensitive nickel alloy forgings shipped to tropical, humid or seawater-adjacent destinations:
- Precision Surface Protection: All machined surfaces and important sealing faces are coated with rust-preventive oil (VCI oil) or removable wax coating immediately after dimensional inspection, before any handling that could introduce contamination.
- Individual Part Wrapping: Each forging is individually wrapped in VCI (Vapour Corrosion Inhibitor) polyethylene film, which provides active corrosion protection for 24 months inside sealed packaging without needing additional desiccant in most climates.
- Cushioned Blocking & Bracing: Parts are nested in custom-cut foam or timber cradles inside the crate, preventing metal-to-metal contact and absorbing vibration during container handling and vessel movement.
- Moisture Control: Silica gel desiccant bags are placed inside each crate in quantities calculated for the destination climate and voyage duration, with humidity indicator cards visible through a crate window for receiving inspection.
- ISPM 15 Certified Timber: All wooden packaging (crates, pallets, dunnage) is made from ISPM 15 heat-treated timber with official marking, needed for import to the USA, EU, Australia and most other regulated markets.
- Stencil Marking & Traceability: Each crate is stencil-marked with order number, part number, heat number, gross weight, net weight, dimensions and destination address. A packing list is laminated and fixed to the crate exterior and also inserted inside.
- Document Envelope: A sealed waterproof document envelope containing the Mill Test Certificate (MTC), inspection reports, heat treatment records and packing list is attached to the primary crate for immediate access at customs.
Production Lead Time Reference
| Order Category | Typical Lead Time | Includes | Notes |
|---|---|---|---|
| Standard forged bar / disc (no machining) | 3 – 5 weeks | Forging + Heat Treatment + UT + MTC | Subject to raw material availability |
| Seamless rolled ring (no machining) | 4 – 6 weeks | Ring rolling + Heat Treatment + NDT + MTC | Large diameter (> 3 m) adds 1–2 weeks |
| Precision CNC machined components | 6 – 10 weeks | Forging + HT + NDT + CNC machining + Final inspection | Complex geometry adds time; DXF/STP files required |
| Third-party inspected (3.2 MTC, TUV/BV/DNV) | Add 1 – 2 weeks | All above + witness inspection scheduling | Inspection agency availability may affect schedule |
| Expedited / urgent order | 2 – 3 weeks | Forging + HT + NDT (expedited) | Premium applies; confirm availability before order |
Important Note on Lead Time: The lead times listed assume VIM+VAR raw billets are available from our stock.For non-standard heat sizes or single-piece forgings over 15 tons, raw material procurement will add an additional 3–6 weeks to the lead time.
We recommend contacting our team during the project planning stage — not when issuing a purchase order — to secure material and reserve press capacity, especially for parts on the critical path.
Minimum Order Quantity (MOQ) Policy
We do not enforce a strict minimum order quantity policy.One sample orders are welcome and produced to the same strict manufacturing standards as full production runs. Every forging is given complete NDT inspection and includes a full EN 10204 3.1 material test certificate, regardless of order size.
For orders with a net weight below 500 kg, a minimum order value applies to cover setup and certification expenses. Please contact our team for a detailed quotation.
Frequently Asked Questions (FAQ) About Hastelloy C22 Forgings
Below are the most frequently asked questions from our global clients about Hastelloy C22 (Alloy C-22, UNS N06022) forging parts. Our answers draw on over 25 years of production experience and real client case data, not from generic material datasheets.
Hastelloy C22 contains 20–22.5% chromium, higher than the 14.5–16.5% in C276, so it has stronger resistance to oxidizing media, wet chlorine, and mixed-acid conditions.It also shows far less sensitization during welding, preserving corrosion resistance in the weld heat-affected zone (HAZ), making it ideal for fabricated parts and mixed oxidizing/reducing environments.
C276 performs better in strongly reducing environments such as pure hydrochloric acid.In practice, about 70% of customers who initially request C276 are actually better served by C22 — especially when the process fluid contains oxidizing impurities or chlorine-based compounds.
Hastelloy C22 can be forged, but because it has a lot of alloying elements, the process must be very strict. The temperature range for forging is very small: 1,175–1,205 °C. This means that the heating rate, deformation speed, and cooling must all be very precise to avoid grain coarsening, residual stress, and loss of corrosion resistance.
A minimum forging ratio of 3:1 is needed to fully break down the cast dendritic matrix from VIM/VAR melting and get the fine, consistent grain matrix needed for improved corrosion resistance and mechanical properties.It is important to partner with a manufacturer that has specialized expertise in nickel alloy forging to make sure the finished parts meet performance requirements.
The usual way to heat treat Hastelloy C22 forgings is by solution annealing them at 1,105–1,135 °C. The holding time depends on how thick the part is. Most of the time, it's 30 minutes for every 25 mm of thickness. After being heated, the part is quickly cooled down in water or another substance that cools quickly. This process takes out unwanted metal phases from the inside, brings back the part's best corrosion resistance, and gives it the mechanical strength it needs. We use calibrated thermocouples to check the temperature of the furnace at different points, and we keep full records of the heat treatment in our standard paperwork.
Yes, Hastelloy C22 works very well in sour service environments containing H₂S. It resists sulfide stress corrosion cracking, pitting, and crevice corrosion extremely well in oil and gas settings with high levels of H₂S, CO₂, and chlorides. It fully meets the NACE MR0175 / ISO 15156 standard for sour service oilfield equipment, so it is the top choice for important wellhead and pipeline parts in sour gas fields.
We can make Hastelloy C22 forgings from 30 kg up to 30 tons for a single piece. For forged bars, the maximum diameter is 2 meters and a maximum length is 15 meters. For seamless rolled rings, the maximum diameter is up to 6 meters. For discs and plates, the maximum diameter is up to 3 meters. We can also produce custom shaped forgings exactly based on your drawings. For complete details, please see our Product Shape and Size Capability Summary Table above.
We don’t have a fixed minimum order quantity. We accept both one sample orders and large volume mass production orders. Single samples go through the same strict production process, full NDT inspection, and EN 10204 3.1 MTC paperwork as bulk orders. For orders under 500 kg net weight, a minimum order value is charged to cover setup and certification costs; please contact our team for a detailed quote. We often provide trial orders of 1–3 pieces to engineering companies and procurement teams who are testing Hastelloy C22 for the first time.
Standard production lead time is 4 to 8 weeks, depending on parts drawings and any machining needed after forging. This time includes forging, heat treatment, NDT inspection, and certification paperwork. If your order needs EN 10204 3.2 third-party inspection by groups like TUV, BV, or DNV, add 1–2 weeks for arranging on-site witness checks. For urgent orders, we can speed up production with time as short as 2–3 weeks. For parts over 15 tons that need special raw materials, add another 3–6 weeks for material sourcing. We strongly suggest contacting our team during project planning to reserve production capacity.
For welding Hastelloy C22, we recommend ERNiCrMo-10 (AWS A5.14) for GTAW and GMAW welding, and ENiCrMo-10 (AWS A5.11) for SMAW welding.It is very important to use filler metal with a matching composition. Do not use C276 filler (ERNiCrMo-4), as it will change the material mix and lower the weld’s ability to resist oxidizing chemicals.Preheating is not needed for parts 38 mm thick or less.Keep the interpass temperature below 100 °C.For the most demanding corrosive applications — such as nuclear coolant systems and heavily loaded chemical reactor nozzles — we recommend post-weld heat treatment: full solution annealing at 1,105–1,135 °C followed by water quenching.
We offer Hastelloy C22 forgings in different surface conditions: as-forged (with scale removed and shot blasted), rough-machined to a finish of Ra 3.2 µm, semi-finished to Ra 1.6 µm, and fully CNC precision-machined to Ra 0.8 µm. For use in pharmaceutical and sanitary applications, our qualified partners provide electropolishing for a finish below Ra 0.4 µm and passivation according to ASTM A967. You tell us which surface condition you need when you place an order, and our engineering team can suggest the best surface finish for your specific corrosive fluid and sealing needs.
Hastelloy C22 has a Pitting Resistance Equivalent Number (PREN) of about 65, calculated using the formula %Cr + 3.3×%Mo + 16×%N. This is one of the highest values among commercial nickel alloys. For comparison, common 316L stainless steel has a PREN of around 23, and 2507 super duplex steel has a PREN of about 42. A higher PREN means better resistance to pitting in chloride environments. In real testing, C22 with a PREN near 65 does not start to pit in 6% FeCl₃ solution (ASTM G48 Method C) at temperatures above 85 °C, while 316L breaks down in minutes at 20 °C under the same conditions. For subsea and chlor-alkali uses where pitting is the main failure risk, PREN is the most important factor when choosing a material.
References & Industry Standards
The technical data, corrosion rates, and mechanical properties on this page are derived from the following authoritative standards and sources:
- ASTM B564 — Standard Specification for Nickel Alloy Forgings. ASTM International, West Conshohocken, PA.
- ASTM B574 — Standard Specification for Low-Carbon Nickel-Molybdenum-Chromium Alloy Rod. ASTM International.
- ASTM G28 — Standard Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought Nickel-Rich, Chromium-Bearing Alloys. ASTM International.
- ASTM G48 — Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys. ASTM International.
- NACE MR0175 / ISO 15156 — Petroleum and Natural Gas Industries — Materials for use in H2S-containing Environments in Oil and Gas Production. NACE International.
- Haynes International — HASTELLOY® C-22® Alloy. Official alloy datasheet from the trademark owner, Haynes International, Inc.
- EN 10204:2004 — Metallic Products — Types of Inspection Documents. European Committee for Standardization (CEN).
- AWS A5.14 / AWS A5.11 — Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods. American Welding Society.
Contact Us for Custom Hastelloy C22 Forging Parts Quotation
Jiangsu Liangyi Co., Limited is your trusted China-based professional manufacturer and supplier of high-quality Hastelloy C22 (Alloy C-22, UNS N06022) forging parts.With over 25 years of nickel alloy forging experience, we have served customers in more than 50 countries around the world. We are committed to providing you with competitive prices, high-quality products, full technical support and customized forging solutions based on your specific project needs.
Welcome to send your custom drawings, material requirements, quantity and other project details to us for a detailed and prompt quotation 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