2022-06-09 ASTM A182 is standard specification for socket weld fittings, threaded fittings and forged steel flanges, the common used grades are F11, F22, F91, F304/304L and F316/316L in various industries. Shanghai Zhucheng Pipe Fittings Manufacturing Co Ltd supplied various pipe fittings & flanges for North American, South American, Europe, Mid East, Southeast Asia, Austiralia and African market.