... .Standard:ANSI,ASTM,MSS,JIS,DIN,EN HY carbon steel Welding Neck Flange We started to product flanges from 1986.With ... ,GB etc.2. TypeSlip On Flange, Flat Face Flange, Socket Welding Flange, Blind Flange, Non-standard flange ect.3. Size1/2 ... ,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8 ect.5. Used forpetroleum, chemical, power, gas, water, linepipe, heat exchanger, shipbuilding, construction ...