... : main raw material to make metal titanium, also used to make titanium steel. Titanium sponge1) TG-TV gradeSpec: Ti 97%min ... , Fe 2.0%max, Mg 0.5%max, ... 02%max, Mg 0.07%max, H 0.005%5) Grade 3 Spec: Ti 99.3%min, Fe 0.20 ... 0.09%max, H 0.012%.7) Grade 5Spec: Ti 98.5%min, Fe 0.40%max, Si 0. ... under 50mm 100% or as buy's option Titanium Sponge