Inconel 718 http://en.wikipedia.org/wiki/Inconel Charge C Si Mn Min Max 0.03 0.35 0.35 P 0.015 S 0.015 Cr 18.50 - Mo 3.00 - Charge Min Max Co 1.00 Ti 0.65 1.15 Al 0.2 0.80 Ta 0.05 B 0.006 Bi Se 0.00003 0.0003 Charge Min Max Nb+Ta 5.00 - Fe 17.00 18.00 Nb 4.75 5.50 Ni 50.00 55.00 Cu 0.30 Pb 0.0005 GX4CrNi13-4 http://www.steelnumber.com/en/steel_composition_eu.php?name_id=384 Charge C Si Mn P S Cr Mo 0.025≤1.00 0.50≤0.035 ≤0.025 12.500.350.035 0.80 13.00 0.50 Ni 4.204.80 X3CrNi13-4 http://www.steelnumber.com/en/steel_composition_eu.php?name_id=89 Charge C Si Mn P S Cr Mo Ni Min 0.25 0.50 12.50 0.35 4.20 Max 0.35 .6/.7 0.80 .03/.04 0.015 13.00 0.50 4.80 N 0.020 - C+N 0.055 TStE355 http://www.steel-grades.com/Steel-grades/Carbon-steel/tste-355.html Charge C Si Mn P S Cr Mo Ni Min 0.1 0.9 Max .18 0.5 1.65 0.03 0.025 0.3 0.08 0.2 V 0.1 Nb 0 0.05 Charge Min Max Al 0.02 Ceq 0.45 N 0.005 0.008 Links do not correspond exactly to tested compositions C+N ≤0.055