... for liquid transportation ,structure, boiler.packagingin bundles, plastic caps, galvanizing, black coating ,or according to customer requirement.ASTMStandardASTM A 106-B ... ,ASTM A 53-B,API 5LMaterial GR.A,GR.B,X42 X46 X52 X56 X60 X65 X70DINStandard DIN1626 ... the production process is made under the ISO9001:2000 strictly. black carbon steel seamless pipe