... steel and alloy steel excellent quality,competitive price,prompt shipment RING JOINT FLANGE:1)Standard:ANSI B16.5,ASME B16.47,DIN ... (WNF), THREDED FLANGE, RF, MF, FMF, TG, FF, SRF ETC.Ring joint flange,carbon steel flangeAPPLICATION: petroleum, chemical, electrical industry, construction. RJ ...