... metal titanium, also used to make titanium steel. Titanium sponge1) TG-TV gradeSpec: Ti 97%min, Fe 2.0%max, Mg 0 ... 1%max, Mn 0.05%max, N 0.1%max2) Grade 0Spec: Ti 99.7%min, Fe 0.06%max, ... 01%max, Mg 0.06%max, H 0.005%3) Grade 1Spec: Ti 99.6%min, Fe 0.10%max, ... 02%max, Mg 0.08%max, H 0.010% 6) Grade 4Spec: Ti 99.1%min, Fe 0.30%max, Si ... 03%max, Mg 0.09%max, H 0.012%.7) Grade 5Spec: Ti 98.5%min, Fe 0.40%max, ...