Ferrochromium is a shiny gray metal with a density of 7.2, a melting point of 1857°C, and a boiling point of 2672°C. It is malleable, but when it contains impurities such as oxygen, hydrogen, carbon, and nitrogen, it becomes hard and brittle. The chemical properties of chromium are inactive, and it is stable to oxygen and water vapor at room temperature. Chromium begins to react with oxygen when it is higher than 600 ℃, but when an oxide film is born on the surface, the reaction will be slow. When heated to 1200 ℃, The oxide film is destroyed and the reaction becomes faster again.
At high temperatures, chromium reacts with nitrogen, carbon, and sulfur. Chromium can interact with fluorine at room temperature. Chromium can dissolve in hydrochloric acid, sulfuric acid and perchloric acid, passivate after encountering nitric acid, and no longer react with acid. Chromium can be alloyed with magnesium, titanium, tungsten, zirconium, vanadium, nickel, tantalum, and yttrium. Chromium and its alloys have strong corrosion resistance.
