... Sponge. Usage: main raw material to make metal titanium, also used to make titanium steel. Titanium sponge1) TG-TV gradeSpec: Ti ... 0.05%max, N 0.1%max2) Grade 0Spec: Ti 99.7%min, Fe 0.06%max, Si 0.02 ... 0.06%max, H 0.005%3) Grade 1Spec: Ti 99.6%min, Fe 0.10%max, Si 0.03 ... 0.08%max, H 0.010% 6) Grade 4Spec: Ti 99.1%min, Fe 0.30%max, Si 0.04 ... 0.09%max, H 0.012%.7) Grade 5Spec: Ti 98.5%min, Fe 0.40%max, Si 0.06 ...