An Alloy C22 tube, also known as Nicrofer 5621 tube, is a nickel-chromium-molybdenum-tungsten alloy made to resist both oxidising and reducing acids. It is one of the many grades of Alloy seamless tubes.
ASTM B622 Alloy C22 Seamless Tube Manufacturer
We are Xintongda Special Steel (XTD), a trusted manufacturer and supplier of Alloy C22 seamless tubes in China. Alloy C22, also known as Nicrofer 5621, is a high-performance nickel-chromium-molybdenum alloy that can handle corrosive environments like oxidising acids, reducing acids, and other chemicals. It comprises a balanced amount of nickel, 20-22.5% chromium, 12.5-14.5% molybdenum, and various other elements in the remaining proportions. We manufacture these C22 tubes in such a way that they fully comply with the ASTM B622 standard. The Alloy C22 tubes can be easily used for applications like pharmaceuticals, chemical processing, pulp & paper, and oil & gas.
We have an annual supply capacity of 25,000 tons, which helps us to serve all your industrial projects or requirements. We can deliver stock items in a week, but custom production orders usually take 15 to 60 days. We are multiple international certified and have a strict system for checking quality.
Product specifications:
-
Standard
ASTM B622
-
OD Range
6-457 mm
-
Thickness
1-65 mm
-
Length
≤ 22 m
Get a free quote now
Technical Data
Technical Data
Key Steps in Manufacturing Alloy C22 Tube
To make the Alloy C22, we first heat and hot extruded a solid billet to form a rough hollow shell. We then use cold-drawing techniques to reduce the diameter and wall thickness to precise tolerances. The last step is solution annealing, which dissolves precipitates and restores the homogeneous solid solution. Visit this page to get detailed information about the manufacturing process.
What are the Features of Seamless Alloy C22 Tube?
Here are 4 specific features that differentiate alloy C22 from others.
- Corrosion Resistance: Alloy C22 is highly resistant to overall corrosion because it has a high content of nickel (around 56%).
- Pitting & Crevice Resistance: The C22 tube contains high chromium content (20-22.5%), molybdenum (12.5-14.5%), and tungsten (2.5-3.5%), which provides excellent resistance to pitting and crevice attack.
- Weldability: The alloy has a low carbon content, which prevents grain boundary precipitation during welding.
- Resistance to Stress-Corrosion Cracking: The nickel base makes the Alloy C22 tubing highly resistant to chloride-induced stress corrosion cracking.
What is the Equivalent Material for Alloy C22?
The Alloy C22 tube is known by several international designations. The primary Unified Numbering System (UNS) code is N06022, but it is also referenced by its German Werkstoff number as 2.4602.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Alloy 22/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
Alloy C22 Tube Industries
The Alloy C22 tubing is found mainly in 8 industries, such as chemical processing, pharmaceutical industry, paper production, oil refining & petrochemical plants, flue gas equipment, automotive, marine, and pollution & waste.
Chemical Processing
Used in chlorination systems, acid scrubbers, reactors and vessels, and making pesticides, where a lot of different acids are mixed.
Pharmaceutical Industry
Seamless Alloy C22 tubes are used in the production of active pharmaceutical ingredients (APIs) and in hygienic settings to keep products from getting contaminated by metal corrosion.
Paper Production
Used in making cellophane, digesters & pulping, and bleaching systems to keep chlorine dioxide from corroding them.
Oil Refining and Petrochemical Plants
Used in sour gas handling, heat exchangers & pressure vessels, furnace components, and systems regenerating catalysts where corrosive salts are present.
Flue Gas Equipment
Essential for flue gas desulphurisation (FGD) systems, mainly in the scrubber inlet ducting and stack liners.
Automotive
Used in specialized sensor protection tubes and exhaust components testing.
Marine
Used in exhaust systems and waste incineration units on ships.
Pollution & Waste
The Nickel alloy C22 tubing is critical in wastewater treatment plants, incineration scrubbing systems, hazardous waste management plants, and chlorination systems, which deal with industrial runoff containing heavy metals and acids.
Frequently Asked Questions
-
What is a Alloy C22 tube?