... steel and alloy steel excellent quality,competitive price,prompt shipment RING JOINT FLANGE:1)Standard:ANSI B16.5,ASME B16.47,DIN ... Cr5Mo 12Cr1MoV 10CrMo910 15CrMo 12Cr2Mo1 A335P22 St45.8/ A10bB ETC. API 5L X42 X52 X60 X70 ETC.SIZE:DN: 1/2 ... (WNF), THREDED FLANGE, RF, MF, FMF, TG, FF, SRF ETC.Ring joint flange,carbon steel flangeAPPLICATION: petroleum, chemical, electrical industry, construction. RJ ...