Basic Properties
Alloy C22 (UNS N06022) seamless pipe is a nickel-based alloy tube with outstanding resistance to both oxidizing and reducing environments. Its chemical composition includes nickel, chromium, molybdenum, and tungsten, making it one of the most corrosion-resistant materials for critical industries.
- Standards: ASTM B622 / ASME SB622
- Grade: Alloy C22 / Hastelloy C22
- Form: Seamless round pipe
- Manufacturing Process: Cold drawn / cold rolled
- Surface Finish: Pickled, polished, customized finish available
Key Advantages
- Superior Corrosion Resistance – Excellent resistance to oxidizing acids (such as nitric acid) and reducing environments, outperforming many conventional alloys.
- High Pitting and Crevice Corrosion Resistance – Especially resistant to chloride-induced localized corrosion compared to Alloy C276.
- Wide Temperature Range – Maintains mechanical strength and corrosion resistance from room temperature up to 870°C (1600°F).
- Good Weldability and Fabrication – Suitable for all conventional welding methods (TIG, MIG, SMAW) and can be easily processed into various components.
Important Parameters
| Outer Diameter | 6 mm – 114 mm |
| Wall Thickness | 0.8 mm – 20 mm |
| Length | 1 m – 12 m (custom lengths available) |
| Standards | ASTM B622, ASME SB622 |
| Chemical Composition (typical) |
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% |
Applications
Alloy C22 seamless pipe is widely used in industries that require reliable resistance against strong corrosive media:
- Chemical Processing: Reactors, heat exchangers, evaporators
- Pollution Control: Flue gas desulfurization (FGD) systems
- Marine Engineering: Offshore platforms, seawater desalination plants
- Pharmaceutical Industry: High-purity chemical piping systems
- Environmental Protection: Waste treatment and discharge systems
Why Choose Us?
- 20,000㎡ Manufacturing Facility with an annual production capacity of 3,000+ tons of stainless steel and nickel alloy products.
- Advanced Equipment – Cold drawing machines, bright annealing furnaces, eddy current & ultrasonic testing for defect-free pipes.
- Strict Quality Control – ISO9001 certified, each product delivered with EN10204 3.1/3.2 test certificates.
- Customization Services – Non-standard sizes, surface finishes, and cut-to-length supply available.
- Global Export Experience – Widely supplied to Europe, America, the Middle East, and Southeast Asia for chemical, energy, and pharmaceutical projects.
Frequently Asked Questions
Q1.What is the difference between Alloy C22 and Alloy C276?
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A1: Alloy C22 contains higher chromium (20–22.5%) than C276, offering better resistance to pitting and crevice corrosion in chloride environments.
Q2: Can Alloy C22 seamless pipes be used at high temperatures?
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A2: Yes. Alloy C22 maintains strength and corrosion resistance up to 870°C (1600°F).
Q3: Do you provide third-party inspection reports?
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A3: Yes. SGS, BV, TUV, or other third-party inspection services are available upon request.
Q4: Do you accept small quantity orders?
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A4: Yes. Standard sizes are available from stock for quick delivery, and we also support small customized orders.
Q5: What is the typical delivery time?
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A5: Standard sizes ship within 7–15 days; customized orders require 20–30 days depending on specifications.
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