... 2500LB, size from DN15 to DN1500Material: Monel, Duplex S.S, Al-alloy, Inconel, 904L, Q235A, 20#, 16Mn,12Cr2Mo, 15Cr5Mo, Cr5Mo, 12Cr1MoV, 0Cr18Ni9 ... and weled neck flange and more as customer requirements. carbon alloy steel a 105n flange weight