High carbon ferrochrome has a carbon content of 4-10%, medium carbon ferrochrome has a carbon content of 0.5-4%, low carbon ferrochrome has a carbon content of 0.15-0.5%, and micro carbon ferrochrome has a carbon content of less than 0.15%.
The smelting methods of micro-carbon ferrochromium include electrosilicothermal method, hot melting method, etc. It is mainly used to improve the oxidation resistance and corrosion resistance of steel, so that the surface of the steel forms a layer of strongly adherent oxide film in the oxidizing atmosphere, and then Oxidation stops or the oxidation rate slows down. Microcarbon ferrochromium is mainly used to produce stainless steel, wear-resistant and heat-resistant steel.
The smelting methods of high carbon ferrochromium include blast furnace method, electric furnace method, plasma furnace method, etc. Blast furnaces can only produce special pig iron containing about 30% chromium. At present, most high-carbon ferrochrome with high chromium content is smelted in submerged arc furnaces using the flux method.
The main uses of high carbon ferrochrome (carbon ferrochrome) are:
1. Used as an alloying agent for circulating pearl steel, tool steel and high-speed steel with high carbon content to improve the hardenability of the steel and increase the wear resistance and hardness of the steel.
2. Used as an additive for cast iron to improve the wearability and hardness of cast iron, and at the same time make cast iron have good heat resistance.
3. Used to produce silicon-chromium alloys, medium, low and micro carbon ferrochromium and chromium-containing raw materials by slag-free method.
4. Used as chromium-containing raw materials for electrolytic production of metallic chromium.
5. Used as raw material for smelting stainless steel by oxygen blowing method. Smelting process of high carbon ferrochrome: The smelting methods of high carbon ferrochrome include blast furnace method, electric furnace method, plasma method, smelting reduction method, etc.