An Alloy C22 Pipe, also known as UNS N06022, is one of the grades of Hastelloy seamless pipe. It is a hollow, cylindrical pipe made of an alloy of nickel, chromium, molybdenum, and tungsten. This offers excellent corrosion resistance in a wide range of aggressive media.
ASTM B622 Alloy C22 Seamless Pipe Manufacturer
We, Zhejiang Xintongda Special Steel (XTD), are a leading Alloy C22 pipe supplier and manufacturer. C22 seamless pipe is a cylindrical and hollow pipe made from a nickel-based alloy. It consists of chromium (20 to 22.5 %), molybdenum (12.5 to 14.5 %), tungsten (2.5–3.5%), and balanced nickel. We manufacture this pipe in compliance with the ASTM B622 standard. The pipe is known for its broad-spectrum corrosion resistance. This includes resistance against oxidising and reducing agents, including strong acids, and resistance to localised corrosion. These characteristics make UNS N06022 pipes ideal for harsh chemical and petrochemical applications where standard materials fail. The seamless construction provides uniform strength and integrity. We have an annual supply capacity of 25,000 tons and ISO-certified quality systems. For stock orders, we can deliver these pipes in about a week. For production orders it can take 15 to 60 days.
Key specifications of the Nickel Alloy C22 pipe include:
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Standard
ASTM B622
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OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
Alloy C22 Seamless Pipe Manufacturing Process
The manufacturing process of Alloy C22 pipe begins with a solid billet of nickel-based alloy. Then this billet is heated and pierced to make a hollow shell. Cold drawing or cold rolling is then used to finish the pipe. This is followed by annealing, pickling, and straightening to optimize mechanical properties, corrosion resistance, and dimensional accuracy. Visit this page to learn about the detailed manufacturing process.
What are the key features of Seamless Alloy C22 Pipe?
Seamless alloy C22 pipes have 4 distinct characteristics that make them preferred for demanding applications. These include corrosion and oxidation resistance, excellent mechanical properties, and workability.
- Corrosion Resistance: Alloy C22 has excellent resistance to localised corrosion, like pitting and crevice attack due to its high chromium content (20.00-22.50%). This forms a passive oxide film on its surface. This crucial property allows the pipe to be used safely with strong acids and aggressive halides in chemical processing equipment.
- Oxidation Resistance: The pipe maintains a protective passive oxide layer due to its high chromium content. This prevents it from degrading in oxidising environments. This feature is important for processes that use hot, oxidising solutions or high temperatures like incinerators.
- Mechanical Properties: C22 seamless pipe has high tensile strength and excellent ductility. This pipe maintains its strength even at elevated temperatures in chemical processing environments. These properties ensure the pipe's structural integrity and reliability in high-pressure systems.
- Workability: This pipe is readily weldable and formable due to its excellent ductility. This allows manufacturers to produce complex pipe configurations and bends. This ease of fabrication is important for creating complex piping systems in environments like sour gas production.
C22 Seamless Nickel Alloy Pipe Equivalent Material
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| C22 | N06022 | H06022 | NS3308 | - | - | 2.4602 | - |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
What are the main Industries & Applications for Alloy C22 Pipe?
Alloy C22 pipe is used in 6 important industries. These include:
Chemical Processing
C22 Alloy pipe is preferred for its excellent resistance to general and localised corrosion in aggressive media. It is used in chemical reactors, heat exchangers and distillation columns that handle strong oxidising and reducing acids.
Pharmaceutical Industry
The pipe's high resistance to corrosion ensures the products' purity and prevents contamination during synthesis. It is used in reactors, pipes, and valves that are part of the production process of APIs (Active Pharmaceutical Ingredients).
Paper Production
C22 seamless pipe resists the highly corrosive chemicals, particularly chloride compounds used in the bleaching process. It is used in pulp bleaching equipment and digesters where standard stainless steel would fail rapidly.
Oil Refining and Petrochemical Plants
This pipe is favoured for its resistance to mixed reducing and oxidising environments in process streams. It is used in piping, furnace components and heat exchangers handling sour gas and corrosive hydrocarbons.
Flue Gas Equipment
The pipe is ideal for resisting the formation and attack of sulfuric and hydrochloric acids from hot combustion gases. It is used in flue gas desulfurization (FGD) scrubbers and ductwork in power plants.
Medical Devices and Components
UNS N06022 pipe is preferred for its biocompatibility and high resistance to physiological environments. It is used in surgical instruments, pharmaceutical equipment and certain specialised piping where material integrity is important.
Frequently Asked Questions
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What is an Alloy C22 Pipe?
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What are the chemical and mechanical properties of Alloy C22 pipe?The chemical composition of Alloy C22 pipe has high levels of Nickel (Balance), Chromium (20–22.5%), Molybdenum (about 12.5–14.5%) and Tungsten (about 2.5–3.5%). This makes it very resistant to corrosion. It has a high tensile strength (minimum 690 MPa) and is very ductile.