large diameter welded spiral pipe 1. Grade: Q345B, API X42 - X80, L245, L555, J55, N80 2. Standard: SY/T5037-2000, GB/T Large diameter welded spiral ... /T9711.1-97, API Spec 5LSpecification of SSAW Steel Pipe:1. Outside Diameter: 219~2420mm,2. Wall Thickness: 5-20mm,3. ... are mainly used for oil, natural gas, gas, central heating, water supply, sewage treatment, low-pressure fluid delivery and so on.