Ferrophosphorus is an iron alloy composed of phosphorus and iron. In addition, it contains impurities such as silicon, manganese, carbon and sulfur. Ferrophosphorus is used as phosphorus additive in iron and steel, alloying additive and deoxidizer in metallurgy. Ferrophosphorus is used as an alloying agent in the steelmaking industry, it can also produce phosphates, and it can also be used as a filler in the production of metal coatings. Phosphorus is a very controversial element. Phosphorus is a harmful component in general steel products. If the phosphorus content in the steel is high, it will cause the cold brittleness of the steel and reduce the plasticity and impact toughness of the steel. But in some special products, the addition of phosphorus can improve the strength, corrosion resistance and machinability of steel, but it also increases the brittleness of steel.
Ferrophosphorus is widely used in rolls, automobile cylinder liners, engine rolls and large castings to improve the corrosion resistance and wear resistance of mechanical parts. Adding phosphorus to cast iron can improve the fluidity of molten iron, thereby improving the performance and surface quality of the casting; gray cast iron contains 0.5% phosphorus, which can improve its tensile strength. Wear-resistant cast iron contains about 0.15% phosphorus, which significantly improves its wear resistance. The train brake shoe contains 0.7% to 1.0% phosphorus and forms a uniform binary phosphorus eutectic structure in the casting and is distributed in a network. Phosphorus eutectic has high hardness, which not only improves its wear resistance, but also improves thermal conductivity and heat resistance. Make the wear surface uniform, and it is not easy to generate sparks when rubbing.