... property black steel pipe 1)Application: conveyance of gas, petroleum, liquid, and electricity;2)We have engineering team for pipeline system ... buildingA: Size Range: Round pipe diameter: 4mm-200mm, thickness: 0.5-10mmB: Surface finish: black, blank, bright and ... ,DIN2394, DIN17175, EN10210, EN10305 etcAPI,GB black steel pipe for normal and mechanical sturcture