Forged flange 1.Standard:ANSI B16.5,ANSI B16.47, 2. ... )RST37.2, A105, Q235A, C22.0 (Stainless):304.304L,316 Forged flange 1.product nameforged flange2.standardANSI B16.5,ANSI B16 ... ,slip on flange,socket welding flange,thread flange5.certicificateTUV ISO Forged flange