... 80mm 3) Manufacturing standards: GB, DIN, JIS, High Pressure Boiler pipeDetailed Product Description STANDARDGB5310 Seamless Steel Pipe For High Pressure ... petroleum cracking TubeASTM A213 Seamless Ferritic and Austenitic Alloy-Steels Boiler, Superheater, and Heat-Exchanger TubesASTM A335 Seamless Ferritic ... (STBA12/ 13/ 20/ 22)JIS G3467 Steel Tubes for Fired Heater (STF 410/STFA 12/ 22/ 23/ 24/ 25 ...