... alloy/Aluminum steel Description of Flange: Production Name forged welding neck flanges,St37,DIN,DN:50-600 mm,rated pressure:10 ... according to customer's requirementMain Flangeblind raised faced flange,weld neck flange, slip on flange , plate flange , Threaded flange, blind ... flangeInspection Factory in-house or Third Party inpection forged welding neck flanges,St37,DIN,DN:50-600 mm,rated pressure:10 ...