The relative density of titanium is 4.506, the melting point is 1668 °C, and the boiling point is 3287 °C. Resistivity 42x10⁻⁸Ω·m (20°C). It is resistant to corrosion because of the dense oxide on the surface, and does not react with oxygen, halogen and water at room temperature, and reacts with oxygen to form titanium dioxide when it is red-hot. It does not react with nitric acid, dilute sulfuric acid and alkali, but is soluble in concentrated sulfuric acid, hydrofluoric acid and aqua regia.
Titanium has plasticity, the elongation of high-purity titanium can reach 50-60%, and the section shrinkage can reach 70-80%, but the strength is low, and it is not suitable as a structural material. The presence of impurities in titanium has a great impact on its mechanical properties, especially interstitial impurities (oxygen, nitrogen, carbon) can greatly improve the strength of titanium and significantly reduce its plasticity. The good mechanical properties of titanium as a structural material are achieved by strictly controlling the appropriate impurity content and adding alloying elements.