Chromium 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 becomes hard and brittle with impurities such as oxygen, hydrogen, carbon and nitrogen.
According to different carbon content, ferrochrome can be divided into high carbon ferrochrome including loading grade ferrochrome (C≦10%), medium carbon ferrochrome (C≦ 4.0%), low carbon ferrochrome (C≦ 0.5%), micro-carbon ferrochrome (C≦ 0.15%) etc. Commonly used silicon chromium alloy, ferrochrome nitride and so on. Ferrochrome is mainly used as an alloy additive in steelmaking and used to be added at the late refining stage of steelmaking. Smelting stainless steel and other low carbon steel, the use of low and micro carbon ferrochrome, so refining ferrochrome production was once a relatively large scale development. Due to the improvement of steelmaking process, AOD method (see refining outside the furnace) is now used to produce stainless steel and other steel, with carbon ferrochrome (mainly loading grade ferrochrome) furnace, so only in the late add low, micro carbon ferrochrome adjustment composition.