1.schedule 20 steel pipe 2.high precision 3.fine finish 4.ideal ... engineering team for pipeline system building A: Size Range: Round pipe diameter: 4mm-200mm, thickness: 0.5-10mmB: Surface finish: ... black, blank, bright and galvanized C: Length of each pipe: 500mm-16,000mm D: Steel grade: st35,st35.8, ... st37,st37.4,st45,st52,SAE,grade A,B etc.E: Conforms to international standards, like:Astm A106,179, ...