Carbon Steel;Stainless Steel;Alloy Steel, Forged flange, casting flange 1.FlangeA ,Material:Carbon Steel(10#, 20#,A3,Q235A,20G, ... 16Mn,ASTM A105,A181, A182, A350, A403 etc.);Stainless Steel ... (304 ,304L,316,316L etc.);Alloy Steel(16MnR,Cr5Mo,12Cr1MoV,10CrMo910,15CrMo, ...