Underground Pile Foundation LSAW Steel Pipe DN1200

For underground pile foundation applications, DN1200 LSAW pipes are typically produced using Q355B or S355J2H structural steel, both offering reliable strength and excellent weldability. Q355B provides a minimum yield strength of approximately 355 MPa, with tensile strength generally ranging from 470 to 630 MPa, enabling the pipe piles to withstand significant axial loads and lateral forces from soil and superstructure weight. The chemical composition is controlled with carbon usually below about 0.20 percent and manganese around 1.60 percent to enhance toughness and reduce cracking risk during welding and installation.

Huayang Steel Pipe manufactures these large-diameter pipes using advanced JCOE forming technology, ensuring precise geometry and uniform wall thickness along the full pipe length. The longitudinal weld seam is completed by double submerged arc welding, providing deep penetration and stable joint strength. Each pipe undergoes ultrasonic testing of the base material, weld seam non-destructive examination, and dimensional inspection. For underground environments, external coatings such as 3PE or bitumen coatings can be applied to improve corrosion resistance and ensure long-term service reliability.