The addition of chromium to steel can significantly improve the oxidation of main steel and increase the corrosion ability of steel. Chromium is found in many steels with special physical and chemical properties. Chromium in steel is added by ferrochrome. High carbon ferrochrome used as an alloying agent for ball steel (0.5%-1.45%Cr), tool steel, die steel (5%-12%Cr) and high-speed steel (3.8%-4.4%Cr), can improve the hardenability of steel, increase the performance and hardness of steel. Adding chromium to cast iron can improve the hardness, the actual effect is the main performance, containing chromium 0.5% to 1.0% can be the actual effect of its mechanical properties. High carbon ferrochrome and charge grade ferrochrome are widely used as the charge for smelting stainless steel (AOD or VOD method) to reduce the production cost. Medium and low carbon ferrochrome is used in the production of medium and low carbon structural steel, carburized steel, manufacturing gear, high pressure blower blades, valve plates and so on. Micro - carbon ferrochrome is used in the production of stainless steel, acid - resistant steel, heat - resistant steel and electric heating alloy.