1) Carbon steel flange 2) Stainless steel flange 3) 20#, A105, Q235A, 12Cr1MoV, 16MnR, 15CrMo,321,304,304L ... ,304,304L,316,316LExample:ANSI B16.5 FORGED FLANGESslip-on flanges, welding neck flanges, socket welding flanges, threaded flanges, lap joint flanges, blind flangesDIN2512, ... DIN2636, DIN2637, DIN2638, DIN2641, DIN2642, DIN2652, DIN2653, DIN2655, DIN2656PN-2.5, PN-6, PN-10, PN-25, PN-40, PN-64 ...