Chromium is a silver white glossy metal with a very high hardness, second only to diamonds (10). The melting point of chromium is 1857 ℃ and the boiling point is 2672 ℃. In the air, chromium hardly oxidizes because it can quickly form a dense protective film. The chemical properties of chromium are relatively stable, insoluble in water, but soluble in dilute hydrochloric acid and dilute sulfuric acid. In addition, chromium can also directly combine with some non-metallic elements such as oxygen, nitrogen, carbon, etc.

The main uses of chromium include as an alloying element, such as stainless steel, ferrochrome alloys, etc. These alloys have good high strength, high corrosion resistance, and high temperature stability. In addition, chromium is also commonly used in coating materials, such as chrome plating, to improve the optical properties and corrosion resistance of metals. Chromium can also be used to produce refractory materials and other special materials.