API 5L Carbon steel welded pipe ERW 1.steel grade: Q195- ... -329mm 3.Standard:ASTM,DIN,JIS,GB 4.best price API 5L Carbon steel welded pipe ERWMaterial:Q195,Q215,Q235,Q345 ... ,Q215,Q235,Q345,ST37,ST37.4,ST52,16Mn Standard:ASTM,API,DIN,JIS,GB/T Outer diameter:DN10-920(2inch-40inch ... in chemical industry, heating, road marking, piling, machine-processing, etc. API 5L/A53 welded steel pipe