... tubes 1) Outside diameter: 20 - 1,067mm 2) Thickness: 1 - 80mm 3) Manufacturing standards: GB, DIN, JIS, Detailed Product Description STANDARDGB5310 Seamless ... EquipmentGB9948Seamless steel tube for petroleum cracking TubeASTM A213 Seamless Ferritic and Austenitic Alloy-Steels Boiler, Superheater ... , and Heat-Exchanger TubesASTM A335 Seamless Ferritic Alloy-Steel Pipe for High-Temperature ...