Large Diameter LSAW Carbon Steel Pipe DN1000 ASTM A252 GR.3 For Piling

API 5L X70 PSL2 is a high-strength pipeline steel with a minimum yield strength of approximately 485 MPa and tensile strength typically ranging from about 570 to 760 MPa. The chemical composition is tightly controlled, usually limiting carbon to around 0.20 percent while incorporating manganese levels near 1.60–1.80 percent and microalloying elements such as niobium and vanadium to enhance strength and toughness. PSL2 requirements also include stricter controls on sulfur and phosphorus, mandatory impact testing, and comprehensive non-destructive examination, ensuring high fracture resistance and reliability under demanding service conditions.

Huayang Steel Pipe manufactures DN1200 LSAW pipes using high-quality thermomechanically rolled steel plates, ensuring uniform microstructure and stable mechanical properties. The JCOE forming process provides precise diameter control and even stress distribution along the pipe body. Longitudinal seams are welded using multi-pass submerged arc welding, delivering deep penetration and consistent weld performance. Each pipe undergoes ultrasonic inspection, radiographic weld testing, and hydrostatic pressure testing. For oil and gas transmission, external coatings such as 3PE and internal flow coatings are commonly applied to improve corrosion resistance and enhance pipeline efficiency.