Titanium is a metallic chemical element, chemical symbol Ti, atomic number 22, in the periodic table of chemical elements in the fourth period, IVB group. It is a silver-white transition metal characterized by light weight, high strength, metallic luster and resistance to wet chlorine corrosion. But titanium can not be applied to dry chlorine gas, even if the temperature of dry chlorine gas below 0℃, there will be a violent chemical reaction to generate titanium tetrachloride, and then decomposition to generate titanium dichloride, or even combustion. Titanium remains reliable in chlorine only when the water content is above 0.5%. It is considered a rare metal because of its dispersion in nature and its difficulty in extraction. But it is relatively abundant, ranking tenth among all elements. Titanium ore mainly ilmenite and rutile, widely distributed in the earth's crust and lithosphere. Titanium has metallic luster and is malleable. The density is 4.5g/cm3. Melting point is 1668 ℃. The boiling point of 3287 ℃. Common valences are +2, +3 and +4. The ionization energy is 6.82 eV. Titanium is characterized by low density, high mechanical strength and easy processing. The plasticity of titanium depends mainly on its purity. The purer the titanium, the greater the plasticity. Good corrosion resistance, not affected by the atmosphere and seawater. Under normal temperature, it will not be corroded by hydrochloric acid less than 7%, sulfuric acid less than 5%, nitric acid, aqua regia or dilute alkali solution; Only hydrofluoric acid, concentrated hydrochloric acid, concentrated sulfuric acid and so on can act on it.

Features
1. Low density and high specification strength
2. Excellent corrosion resistance
3. Good heat resistance
4. Excellent low temperature resistance
5. Non-magnetic and non-toxic
6. Good thermal performance
7. Low elastic modulus
8. Good toughness and light weight
9. High acid-base resistance
10. Resistance to high temperature, low temperature, etc