Titanium is a metallic element, Gray, 22, relative atomic mass atomic number 47.87. Can burn under nitrogen, high melting point. Blunt titanium and titanium-based alloy is a new structural materials, mainly for the aerospace industry and the maritime industry. In the crust, titanium reserves second only to iron, aluminum, magnesium, ranking fourth. Because titanium has a high melting point, the proportion of small, high strength, toughness, fatigue resistance, corrosion resistance, low thermal conductivity, good low temperature resistance properties, thermal shock under stress conditions and other characteristics, its commercial value in the twenty 1950s was recognized, is used in aviation, aerospace and other high-tech fields.