S235j2 Resistance Welded Pipe

In the manufacturing process of S235J2 Resistance Welded Pipe, several key process parameters must be meticulously controlled to ensure the pipe's performance:

Material Selection: The raw material should be of low carbon content, with a chemical composition that meets the EN 10025-2 standard, ensuring the steel's weldability and cold-forming properties .

Welding Process: High-frequency electric resistance welding (HF-ERW) is commonly used, where the steel strip is cold-formed into a cylindrical shape and welded using a high-frequency current. The weld's quality is critical and must be free from defects such as cracks or inclusions .

Post-Weld Heat Treatment (PWHT): This treatment is essential for refining the microstructure, improving toughness, especially for pipes intended to operate in lower temperatures. The PWHT thermal cycles should be carefully controlled to avoid over-tempering or under-tempering, which can affect the pipe's mechanical properties .

Mechanical Properties: The yield strength, tensile strength, and elongation must be within the specified limits as per the standard. For S235J2, the minimum yield strength is 235 MPa, and the pipe should have an impact energy of at least 27 joules at -20°C .

Non-Destructive Testing (NDT): Regular ultrasonic or radiographic testing is conducted to ensure there are no internal defects in the weld or the base material.

FAQ:

1.Q:Are you a factory or trading company?
We are factory and China Top 500 Enterpris
2.Q:Where is your factory located? How can I visit there?
We locate in Tianjin, China, 30 minutes from Beijing by train.
3.Q:Can I get some samples?
Yes,free samples can be provided

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