forged welding neck flanges,St37,DIN,rated pressure10bar 1.Standard:ANSI, DIN,JIS, BS 2.carbon/stainless/ ... forged welding neck flanges,St37,DIN,DN:50-600 mm,rated pressure:10 bar Size1/4''-48'',DN8-DN1200WTSCH5S-XXSStandardANSI B16 ... forged welding neck flanges,St37,DIN,DN:50-600 mm,rated pressure:10 bar