Pakistan State Oil(PSO) Gatti Project LSAW Steel Pipe API 5L PLSL1 X52

API 5L X52 PSL1 is a micro-alloyed carbon steel with a minimum yield strength of 360 MPa, offering higher load-bearing capacity compared with Grade B and X42. Its controlled carbon equivalent ensures good weldability while maintaining sufficient toughness for long-distance oil and gas transportation. For the PSO Gatti project, Huayang applies thermo-mechanically controlled steel plates, strict forming accuracy, and multi-pass submerged arc welding. Each pipe undergoes ultrasonic testing, radiographic inspection of the weld seam, hydrostatic pressure testing, and mechanical property verification. This process guarantees consistent strength, reliable seam integrity, and dimensional stability, making the pipes suitable for long-term, high-reliability operation in Pakistan's energy infrastructure projects.