... steel and alloy steel excellent quality,competitive price,prompt shipment RING JOINT FLANGE:1)Standard:ANSI B16.5,ASME B16.47,DIN,JIS ... ON FLANGE (SO), WELDING ON FLANGE, BLIND FLANGE, STEEL PIPE FLANGE, WELDING NECK FLANGE (WNF), THREDED FLANGE, RF, MF, FMF, TG, FF, SRF ETC.Ring joint flange,carbon steel ...