3. The main production process for titanium metal is known as the Kroll Process. In this process, the main ore, known as rutile, is treated with chlorine gas to produce titanium tetrachloride. This is then purified and reduced to a metallic titanium sponge by reaction with magnesium or sodium. The titanium sponge then undergoes an alloying and melting process.

4. For the most common type of titanium, Ti-6AL-4V, the composition are as follows: Aluminum (5.50%-6.75%) Vanadium (3.50%-4.50%) Carbon (maximum 0.08%) Nitrogen (maximum 0.05%) Oxygen (maximum 0.20%) Hydrogen (maximum 0.0125%) Iron (maximum 0.30%) Yttrium (maximum 0.005%) Others (Total maximum 0.40%) Titanium (remainder)

5. They are usually used for: Aircraft Spacecraft Medical devices and dental implants Premium sports equipment Consumer electronics Turbine Hand tools Discs