Hastelloy C-22 (UNS N06022 / Alloy C22) – Supplier of Round Bars, Seamless Tubes & Plates | Shanghai Hangbo Alloy Group

By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | Est. 2012 | Shanghai, China

Quick Answer: What Is Hastelloy C-22?

Hastelloy C-22 (UNS N06022 / W.Nr. 2.4602), also known as Alloy C22, is a versatile austenitic nickel-chromium-molybdenum-tungsten superalloy with enhanced resistance to pitting, crevice corrosion, and stress-corrosion cracking compared to other Ni-Cr-Mo alloys like C-276. It provides exceptional protection in both oxidizing and reducing environments, making it the premier choice for the most aggressive chemical processing, pharmaceutical, and pollution control systems. Shanghai Hangbo Alloy Group supplies Hastelloy C-22 in precision round bars, seamless tubes, and plates with full EN 10204 3.1 material traceability.

Key Properties at a Glance

Product Overview

Hastelloy C-22 (UNS N06022) represents the "optimized" generation of the Ni-Cr-Mo alloy family. Developed to surpass the performance of Alloy C-276 and Alloy 625, C-22 features a higher chromium content (22%) which provides significantly better resistance to oxidizing media, such as nitric acid and ferric chlorides. Simultaneously, its high molybdenum (13%) and tungsten (3%) levels ensure stability in reducing environments. Its superior thermal stability prevents the formation of grain-boundary precipitates during welding, allowing components to be used in the as-welded state even in severe services.

Top three properties:

1. Widest Corrosion Range: Superior resistance to a vast spectrum of chemical media, from highly oxidizing to strongly reducing.
2. Improved Pitting Resistance: Higher PREN than C-276 ensures absolute stability in hot chloride solutions.
3. Exceptional Weldability: Resists sensitization and intergranular attack in the heat-affected zone (HAZ).

Shanghai Hangbo Alloy Group Co., Ltd. (est. 2012) is a specialized manufacturer and global distributor of Hastelloy C-22. From our facility in Shanghai, China, we operate an ISO 9001:2015 certified supply chain serving critical infrastructure in over 32 countries. We provide Hastelloy C-22 as round bars, seamless tubes, and plates, ensuring zero-defect quality for high-purity pharmaceutical water systems and aggressive chemical scrubbers.

Related grades: Hastelloy C-276 · Hastelloy C-2000 · Inconel 625 · Monel 400

Executive Standards

Chemical Composition (wt.% per ASTM B574)

100% OES verified on every heat at Shanghai Hangbo Alloy Group.

Mechanical & Physical Properties

Room-Temperature Properties (Annealed)

High-Temperature Strength Retention

Heat Treatment

Hastelloy C-22 is utilized in the solution-annealed condition to achieve its maximum metallurgical stability and corrosion performance.

• Solution Annealing Temperature: 1121°C – 1149°C (2050°F – 2100°F).
• Soaking Time: 30 to 60 minutes per inch of section thickness.
• Cooling Method: Rapid air cool or water quench. Rapid cooling is mandatory to prevent the precipitation of intermetallic mu-phases and carbides that can compromise ductility and corrosion resistance.
• Microstructural Effect: The process results in a fully austenitic grain structure with all alloying elements (Mo, W, Cr) held in solid solution.
• Grain Size Control: Shanghai Hangbo maintains an ASTM grain size of No. 5 or finer, ensuring optimal mechanical toughness and uniform corrosion response.

How Shanghai Hangbo Produces Hastelloy C-22

1. Round Bars & Forgings

1. Clean Melting: Vacuum Induction Melting (VIM) followed by Electroslag Remelting (ESR) to ensure ultra-low carbon (≤0.01%) and nitrogen levels.
2. Precision Forging: Hot forging in the 1000–1200°C window to homogenize the structure and refine grains.
3. Annealing: Solution annealing at 1125°C followed by immediate water quenching.
4. Finishing: Centerless grinding to h9/h11 tolerances; Ra ≤ 0.8 µm surface finish.

2. Seamless Tubes & Pipes

1. Billet Extrusion: High-purity ESR billets extruded at 1100°C into mother tubes.
2. Cold Reduction: Precision cold drawing or pilgering to reach final dimensions (OD 6mm–219mm).
3. Hydrogen Annealing: Solution annealing in a protective hydrogen atmosphere for a bright, passive surface.
4. NDT Verification: 100% Eddy Current and Hydrostatic testing to ensure pressure-tight integrity.

3. Plates, Sheets & Strips

1. Rolling: Hot rolling of slabs followed by precision cold rolling for smooth surface finish.
2. Pickling: Solution annealing followed by chemical pickling to ensure a clean, oxide-free passive layer.
3. Flatness Control: Levelling to ≤ 3 mm/m flatness for critical reactor vessels.
4. Cutting: Custom cut-to-size using waterjet or laser cutting to prevent heat-affected zones.

Industry Applications

Quality Assurance: 7-Stage Zero-Defect Inspection

1. OES/PMI Verification: 100% verification of chemical composition per heat number.
2. Hardness Testing: Verification of solution-annealed state (≤ 100 HRB) across the section.
3. UT (Ultrasonic Testing): Per ASTM A388 or AMS 2630 to ensure zero internal voids or inclusions.
4. Corrosion Resistance Test: Periodic G48 pitting or intergranular corrosion verification.
5. Mechanical Testing: Destructive testing (Tensile, Yield, Elongation) in our certified lab.
6. Grain Size Inspection: Per ASTM E112 to ensure No. 5 or finer.
7. Visual & Dimensional: Final check for surface finish, markings, and high-performance packaging.

Deliverables: ISO 9001:2015 certificate, EN 10204 3.1 MTC, and SGS/BV/TÜV reports on request.

Frequently Asked Questions

Q1: What is Hastelloy C-22 used for?

Hastelloy C-22 (Alloy C22) is primarily used for severely corrosive environments in chemical processing, pharmaceuticals, waste treatment, and offshore oil & gas where resistance to both oxidizing and reducing media is required.

Q2: What is the density of Hastelloy C-22?

The density of Hastelloy C-22 is 8.69 g/cm³ (0.314 lb/in³).

Q3: What is the maximum service temperature of Hastelloy C-22?

For pressure vessel applications, it is typically used up to 675°C (1250°F). It maintains oxidation resistance up to 1040°C.

Q4: What is the melting point of Hastelloy C-22?

Hastelloy C-22 has a melting range of 1357°C to 1399°C (2475°F to 2550°F).

Q5: What is the tensile strength of Hastelloy C-22?

In the solution-annealed condition, Hastelloy C-22 provides a minimum room-temperature tensile strength of ≥ 690 MPa (100 ksi).

Q6: What is the yield strength of Hastelloy C-22?

The yield strength (0.2% offset) of annealed Hastelloy C-22 is typically ≥ 310 MPa (45 ksi) at room temperature.

Q7: What is the elongation of Hastelloy C-22?

Hastelloy C-22 offers exceptional ductility, with a typical elongation of ≥ 45% in the annealed condition.

Q8: What are the full mechanical properties of Hastelloy C-22?

Hastelloy C-22 is characterized by high tensile strength (690 MPa), good yield strength (310 MPa), and very high elongation (45%), combined with the highest versatile corrosion resistance in its class.

Q9: What heat treatment does Hastelloy C-22 require?

It requires solution annealing at 1121°C – 1149°C followed by a rapid water quench or air cool to prevent secondary phase precipitation.

Q10: What is the solution annealing temperature for Hastelloy C-22?

The standard solution annealing temperature is between 1121°C and 1149°C.

Q11: How does Hastelloy C-22 compare to Hastelloy C-276?

Hastelloy C-22 has a higher chromium content than C-276, providing better resistance to oxidizing environments like nitric acid and ferric chlorides. It is generally considered the more versatile "upgrade" to C-276.

Q12: What is the price of Hastelloy C-22 per kg?

Pricing is influenced by the current molybdenum (13%) and nickel market prices. Please contact Shanghai Hangbo Alloy Group at specialalloy001@gmail.com or hangbo@nickel-alloy.com for a real-time quote.

Q13: Is Hastelloy C-22 weldable?

Yes, Hastelloy C-22 has excellent weldability. Its thermal stability prevents the formation of grain-boundary precipitates during welding. Matching filler wire (Alloy 22) is recommended.

Q14: What product forms does Shanghai Hangbo supply?

We supply Hastelloy C-22 in round bars (6mm–400mm), seamless tubes, plates, sheets, and wire.

Q15: Does Shanghai Hangbo ship internationally?

Yes. We export to over 32 countries with full customs support and door-to-door delivery options (DDP/DAP).

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Shanghai Hangbo Alloy Group Co., Ltd. — Your Premier Source for Advanced Corrosion-Resistant Superalloys.