... flange, slip on flange, socket welding flange, blind flange2. Material: Stainless steel, carbon steel,alloy steel---20#, A105, Q235A, 331, 304 ... , AWWA4. Facing:TG,RF,MFM,FM,FF,RJDIN WELDING NECK STAINLESS STELL FLANGE DIN Standard Stainless Steel Flange