... Welding) Specification:Diameter of pipe is 219-3500mm,and wall thickness is 6-28mm. Cangzhou Spiral Steel Pipe Group Co., Ltd ... of our product is from φ219mm to φ3500mm and wall thickness is from 6mm to 28mm. The brand of our product ... the standard of SY/T5037-2000, GB/T9711 and API SPEC 5L, the material can be Q235A/B,Q345B, L245,L360 ...