... (2)iso9001 certificate (3)API 5Land API5CT certificate1> seamless steel pipe Size: OD 1/8 inch --14 inch, wall ... ,wall thickness:15mm to 100mm6> precision cold drawn seamless steel pipe: OD20mm to 203mm,wall thickness:2mm to 30mmthe ... ,40Cr,35CrMo,42CrMo,12CrMoV,10CrMo910, 12Cr1MoV, 15CrMo etc.seamless steel pipe Main materialStandard accordingspecification Alloy pipeCr5Mo.(P5.STFA25.T5)GB5310- ...