LSAW Steel Pipe Q235B

Q235B is a low carbon structural steel under the Chinese GB standard system, with a minimum yield strength of 235 MPa and tensile strength ranging from 370 to 500 MPa. The carbon content is typically ≤ 0.22 percent, ensuring good weldability and forming performance during plate rolling and longitudinal welding. At Huayang Steel Pipe, Q235B plates are sourced from certified mills with full mill test certification, and each pipe undergoes ultrasonic testing, X-ray weld inspection, and hydrostatic pressure testing. The LSAW process guarantees uniform weld penetration and dimensional stability, especially for large diameters above 800 mm. With strict control over ovality, straightness, and weld seam reinforcement, Huayang ensures reliable performance in municipal pipelines, steel structure foundations, and water transmission systems.