... 0.06%, C 0.02%max, N 0.02%max, O 0.06%max Mn 0.01%max, Mg 0.06%max, H 0.005%3) Grade 1Spec ... 0.08%, C 0.03%max, N 0.02%max, O 0.08%max Mn 0.01%max, Mg 0.07%max, H 0.005%4) Grade 2Spec ... 0.15%, C 0.03%max, N 0.04%max, O 0.15%max Mn 0.02%max, Mg 0.08%max, H 0.010% 6) Grade 4Spec ... 0.15%, C 0.04%max, N 0.05%max, O 0.20%max Mn 0.03%max, Mg 0.09%max, H 0.012%.7) Grade 5Spec ...