Material: Carbon Steel; Stainless Steel; Alloy Steel Forged flanges or casting flanges 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, ...