... HG/T21635,HG/T21631,SY/T050104.Material: Carbon steel flanges ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, ... , F50, F52, F56, F60, F65, F70 Stainless steel flanges ASTM A182 F304/304L, F316/316L, F316H, F310, F321, ... F44 (UNS S31254) Alloy Steel flanges ASTM A182 F1, F5a, F9, F11, F12, F22, F915 ... corrosion and high-temperature resistant with black painting Socket-welding reducing tee