forged welding neck flanges,St37,DIN,rated pressure10bar 1.Standard:ANSI, DIN,JIS, BS ... /Aluminum steel Description of Flange: Production Name forged welding neck flanges,St37,DIN,DN:50-600 mm,rated pressure:10 bar ... Factory in-house or Third Party inpection forged welding neck flanges,St37,DIN,DN:50-600 mm,rated pressure:10 bar ...