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 ... etc.);Alloy Steel(16MnR,Cr5Mo,12Cr1MoV,10CrMo910,15CrMo,12Cr2Mo1,A335P22,St45.8/III, A10bB)B,Standard:<1> ANSI 150 300 ... <3>.Slip-on Lap <4>.Joint<5>. Screwed<6>.Blind Plate <7>.Flat Plate <8>. Abnormity Flange D,SPEC: 1/2- 36inch steel flange