... main material for carbon steel, stainless steel and alloy steel bl flangeProfessionally export,designed, produced and sold such as ANSI/ASME ... , such as ASTM A105, A182, A350, A694, ST35.8, ST45.8, ST37.2, C22.8, SS400, SM400B, 20Mn, 20 #, Q235, 16Mn, F304/304L ... , F316/316L, F321, F11/42/46/52/60/65, 15CrMo, 12Cr1MoV such. bl ...