In industries such as chemical processing, marine engineering, pollution control, and aerospace, selecting the right corrosion-resistant material is crucial for performance, safety, and cost-efficiency. One common question that arises when specifying materials is: Is Alloy 22 Hastelloy?
The answer is yes—Alloy 22 is a Hastelloy, developed by Haynes International, and it is one of the most corrosion-resistant metal alloys available today. This article explores what Hastelloy C-22 (also known as Alloy 22) is, how it compares to other Hastelloy grades, and why it’s preferred in some of the world’s harshest environments.
What Is Hastelloy?
Hastelloy is a registered trademark for a family of corrosion-resistant metal alloys primarily based on nickel. These alloys are engineered for high-performance in aggressive chemical environments and include several series such as:
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Hastelloy C series – for both oxidizing and reducing conditions
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Hastelloy B series – optimized for reducing acid environments
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Hastelloy X, N, and G series – specialized for high-temperature and nuclear applications
Alloy 22, also known as Hastelloy C-22, is one of the most versatile members of the Hastelloy family and is widely used for its superior resistance to pitting, crevice corrosion, and stress corrosion cracking.
Is Alloy 22 Hastelloy? Yes.
Alloy 22 = Hastelloy C-22
The terms Alloy 22 and Hastelloy C-22 refer to the same material. Developed by Haynes International, C-22 is part of the Hastelloy C family, which also includes C-276, C-4, and others. It is distinguished by its enhanced resistance to oxidizing agents and its excellent performance in mixed acid environments.
Trade Names for Alloy 22:
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Hastelloy C-22 (by Haynes International)
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N06022 (UNS designation)
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2.4602 (EN / DIN designation)
Chemical Composition of Hastelloy C-22 (Alloy 22)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 20.0 – 22.5 |
| Molybdenum (Mo) | 12.5 – 14.5 |
| Iron (Fe) | 2.0 – 6.0 |
| Tungsten (W) | 2.5 – 3.5 |
| Cobalt (Co) | ≤ 2.5 |
| Carbon (C) | ≤ 0.015 |
The combination of Cr, Mo, and W provides Alloy 22 with exceptional corrosion resistance to a wide range of media including chlorides, acids, and oxidizers.
Key Features of Alloy 22 (Hastelloy C-22)
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Exceptional Corrosion Resistance
Withstands oxidizing and reducing environments, including wet chlorine, nitric acid, and ferric/ cupric chlorides. -
Pitting and Crevice Corrosion Resistance
One of the highest resistance ratings among all commercially available alloys. -
Stress Corrosion Cracking Resistance
Effective in chloride-bearing solutions and under mechanical stress. -
Weldability
C-22 can be welded using conventional methods without losing corrosion resistance in heat-affected zones. -
Thermal Stability
Maintains mechanical integrity at elevated temperatures.
Applications of Hastelloy C-22 (Alloy 22)
Due to its unmatched corrosion resistance, Alloy 22 is commonly used in:
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Chemical processing equipment
Reactors, heat exchangers, evaporators, storage tanks -
Pharmaceutical and food industry
Clean-in-place systems, high-purity water systems -
Marine and offshore engineering
Desalination plants, marine exhaust systems -
Air pollution control systems
Flue gas scrubbers, stack liners, ducting -
Waste treatment plants
Incineration systems, leachate recovery, acid recovery units -
Nuclear power
Fuel recycling, nuclear waste handling equipment
Comparison: Alloy 22 vs Other Alloys
| Property | Alloy 22 (C-22) | C-276 | Stainless Steel 316L |
|---|---|---|---|
| Base | Nickel | Nickel | Iron |
| Cr content | 22% | 16% | 16% |
| Mo content | 13% | 16% | 2% |
| Chloride resistance | Excellent | Very Good | Fair |
| Oxidizer resistance | Excellent | Good | Poor |
| Weldability | Excellent | Good | Good |
| Cost | High | High | Low |
Conclusion: Alloy 22 offers better resistance to oxidizers and chlorides than C-276 and is far superior to stainless steels in harsh conditions.
Why Choose Alloy 22 Over Other Hastelloy Grades?
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C-276 is excellent in reducing environments but can be vulnerable to strong oxidizers.
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C-22 adds higher Cr content, making it superior in mixed acid and oxidizing environments.
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B-series alloys (e.g., B-2, B-3) are great in hydrochloric acid but not resistant to oxidizing agents.
If your process involves both oxidizing and reducing chemicals, Alloy 22 (Hastelloy C-22) is the most versatile and reliable choice.
Sourcing Hastelloy C-22 From sasaalloy
When sourcing high-performance alloys like Hastelloy C-22, material traceability, certifications, and delivery speed matter. At sasaalloy, we provide:
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Certified Alloy 22 / Hastelloy C-22 round bars, plates, tubes, and fittings
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Cut-to-size services and custom machining
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EN 10204 3.1 / 3.2 material certificates
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Prompt international delivery
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Expert technical support
Whether your application is in chemical processing, marine systems, or high-purity environments, sasaalloy ensures consistent quality and material performance.
Conclusion
Is Alloy 22 Hastelloy?
Yes. Alloy 22 is Hastelloy C-22, a high-performance, nickel-based superalloy developed by Haynes International. It is widely recognized for its outstanding corrosion resistance in both oxidizing and reducing environments, making it a trusted material in the world’s most demanding applications.
If you require a material that can withstand the harshest chemicals and temperatures with ease, Alloy 22 is a top-tier choice. And with experienced suppliers like sasaalloy, you gain access to premium material solutions with global reach and technical excellence.
Post time: Aug-05-2025