Is titanium a rare metal? What are the properties and uses?

Titanium is a transition metal and has been considered a rare metal for some time. Since the 1940s, titanium and its compounds have been widely used in aircraft, rockets, missiles, satellites, spacecraft, ships, military, medical and petrochemical fields. Because titanium has high melting point, hardness, plasticity, low density, corrosion resistance and other advantages; Titanium looks like steel and has a silver - gray light translation. Titanium has great strength, and the tensile strength of titanium alloy is 180kg/mm3. Titanium is characterized by low density (4.51g/cm3), high hardness, high melting point (1675℃), high purity titanium has good plasticity, but becomes brittle and hard in the presence of impurities. At room temperature, titanium does not react with chlorine, dilute sulfuric acid, dilute hydrochloric acid and nitric acid, but can be attacked by hydrofluoric acid, phosphoric acid and molten alkali. Titanium is easily dissolved in H2SO4. The most outstanding property of titanium is its strong corrosion resistance to seawater. Titanium accounts for about 0.42% of the total weight in the earth's crust, ranking seventh in the metal world, with more than 70 kinds of titanium minerals. At present, titanium has been widely used in aircraft, rockets, missiles, satellites, spacecraft, ships, military, light industry, chemical, textile, medical and petrochemical fields.

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