stainless steel flange,duplex,weld neck flange.. 1.ss 201,301,304,316,etc. 2.all sorts of design 3.ISO,SGS stainless steel flange,duplex,weld neck flange.. Type:Slip On Flange, Welding Neck Flange, Socket Welding Flange, Threaded Flange, Lap Joint Flange, Blind Flange and other kinds of special flanges.Standard:America:ASME B16.5,ASME B16.48,ASME B16.47,API 590China:GB/T9112~GB/T9124-2000,GB/ ...