Gas Transmission LSAW Steel Pipe 630mm

For gas transmission applications, the 630 mm LSAW pipe is commonly produced in API 5L Gr.B or X52 grade, depending on project design pressure. Taking API 5L Gr.B as a reference, the minimum yield strength is 245 MPa, tensile strength ranges from 415–760 MPa, and elongation is typically above 22 percent. For X52, the minimum yield strength reaches 360 MPa, offering improved load-bearing capacity for higher pressure systems.

At Huayang Steel Pipe, the 630 mm specification is formed through JCOE or UOE processes, ensuring precise roundness and uniform weld seam quality. Online ultrasonic testing, X-ray inspection, hydrostatic testing up to 100 percent, and weld seam impact testing are conducted in accordance with API 5L requirements. Dimensional tolerance is strictly controlled, with OD tolerance generally within ±0.75 percent and wall thickness tolerance compliant with standard limits. This makes the product suitable for urban gas networks, cross-country pipelines, and regional transmission projects requiring consistent mechanical performance and welding reliability.