Alloy C4 tube, also known as alloy C4, is a high-performance tubular product mainly made up of nickel, chromium, and molybdenum. It is one of the grades of alloy seamless tubes.
ASTM B622 Alloy C4 Seamless Tube Manufacturer in China
We are Xintongda Special Steel (XTD), a trusted manufacturer and supplier of the alloy C4 seamless tubes. This tube is a weld-free high-performance product made of nickel (around 65%), chromium (14-18%), molybdenum (14-17%), and other elements. We make our alloy C4 tubes using new-and-improved technology, and as per the ASTM B622 standard. This tube has exceptional corrosion resistance and thermal stability, which makes it useful for industries that face harsh chemicals and elevated temperatures (up to 1038 °C). The Ni-Cr-Mo tube is also highly resistant to sensitisation at heat-affected zones (HAZ). These characteristics make the alloy C4 tube a suitable choice for chemical, petrochemical, pulp & paper, and other industrial applications that face stress corrosion cracking and elevated temperatures.
At XTD, we have brilliant production and supply facilities, which help us to produce 25,000 tons annually. Our company is also ISO certified with more than four decades of experience. Due to this, we can deliver in-stock orders within a week and production orders in 15-60 days.
Product specifications:
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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
≤ 22 m
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Technical Data
Technical Data
Key Steps in Manufacturing Alloy C4 Tube
We manufacture the UNS N06455 tube by heating and piercing a solid billet of the alloy to form a hollow shell, followed by hot working and cold drawing/ cold rolling to get precise dimensions. After that, we perform solution annealing on that tube to retain its corrosion resistance. Finally, we do acid pickling and straightening before sending it for tests. For detailed information, refer to our manufacturing process page.
What are the Features of Seamless Alloy C4 Tube?
The Alloy C4 tubing has 5 main characteristics which make it stand out: high temperature resistance, mechanical properties, chemical stability, corrosion resistance, and wear resistance.
- High Temperature Resistance: The C4 alloy tube remains stable and resists oxidation at high temperatures up to 1038 °C (1900 oF) due to its high nickel-chromium-molybdenum content.
- Mechanical Properties: This alloy exhibits exceptional mechanical properties, like yield strength, elongation, and tensile strength, achieved through solid solution strengthening that maintains structural integrity.
- Chemical Stability: The alloy C4 tube’s specific chemical composition, combined with low amounts of carbon and iron, results in a chemically stable tube.
- Corrosion Resistance: The nickel (approximately 65%) present in this alloy provides corrosion resistance against chlorides, acids, and alkali solutions. The molybdenum (14-17%) helps resist pitting and crevice corrosion.
- Wear Resistance: The Alloy C4 tube exhibits excellent wear resistance in corrosive and high-temperature environments due to its protective oxide layer and stable microstructure.
What is the Equivalent Standard for Alloy C4?
The Alloy C4 tube is recognised mainly through its standard designation UNS N06455. However, it is also known by many other international designations, like DIN designation 2.4610. The other equivalent designations have been covered in the table given below.
| STANDARD | WERKSTOFF NR. | UNS | AFNOR |
| Alloy C4 | 2.4610 | N06455 | NC 20 FeMo |
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 industries commonly use Alloy C4 tubing?
The ASTM B622 alloy C4 tube finds its application in industries exposed to harsh chemicals, elevated temperatures, etc.
Chemical Processing
Alloy C4 tube is extensively used in components like heat exchangers, evaporators, reaction vessels, and transfer piping.
Pharmaceutical Industry
Used for piping equipment, reactors, storage vessels, etc., as it can handle high temperatures and oxidising acids very well.
Petrochemical
Alloy C4 tubes can be found in applications like condensers, heat exchangers, reactors, and Flue Gas Desulfurisation (FGD).
Aerospace
Used in specific applications like fuel injectors and exhaust systems due to high heat tolerance.
Pulp and Paper Industry
C4 is mainly found in bleaching plants handling chlorine dioxide, hypochlorite, and wet chlorine gas. It is also used in digester components, acid handling and transfer lines, and pollution control equipment.
Frequently Asked Questions
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What is an Alloy C4 tube?