Titanium Sponge. Usage: main raw material to make metal titanium, also used to make titanium steel. Titanium sponge1) TG-TV gradeSpec: Ti 97%min, Fe 2 ... .5%max, Si 0.1%max, C 0.1%max, Mn 0.05%max, N 0.1%max2) Grade 0Spec: Ti 99 ... 0.07%max, H 0.005%4) Grade 2Spec: Ti 99.5%min, Fe 0.15%max, Si 0.03%max, Cl ... %max, Mg 0.07%max, H 0.005%5) Grade 3 Spec: Ti 99.3%min, Fe 0.20%max, Si 0 ...