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