Titanium, however doesn't stand a chance against bullets fired from high-powered military grade firearms such as those used to penetrate tanks. Titanium can take single hits from high-caliber bullets, but it shatters and becomes penetrable with multiple hits from military-grade, armor piercing bullets.

How thick does titanium need to be to stop a bullet?

Due to the low sectional impact energy, the titanium sheet or plate used to protect against handgun ammunition ( especially for monolithic armor) will typically have a thickness less than one-half the diameter of the projectile (t/D < 0.5).

Would titanium make good body armor?

1: Ti Armor. Titanium has long been recognized as a superior material for many combat systems and components due to an excellent combination of properties. It has a high strength-to-weight ratio, excellent ballistic mass efficiency, and is corrosion resistant.