Ferro Phosphorus

Ferrophosphorus is obtained from phosphorus-making electric furnaces. It is a symbiotic compound containing 20-26% phosphorus and 0.1-6% silicon, which can change the corrosion resistance and chipping properties of steel. FeP is used as an alloying agent in the steelmaking industry and can also produce phosphates. There are two varieties of ferro phosphorus alloy produced in my country, FeP1 and FeP2, which contain 15-20% phosphorus.

Phosphorus is a harmful impurity for most steels. But it has its special role in some cases. For example, adding phosphorus to some steel grades can improve the strength, corrosion resistance and machinability of steel, but increase the brittleness of steel. Adding phosphorus to cast iron can improve the fluidity of molten iron, thereby improving the performance and surface quality of castings; gray cast iron contains 0.5% phosphorus, which can improve its tensile strength. Wear-resistant cast iron contains about 0.15% phosphorus, which can significantly improve its wear resistance.

Train brake shoes contain 0.7% to 1.0% phosphorus, forming a uniform binary phosphorus eutectic structure in the casting, and are distributed in a network. Phosphorus eutectic has high hardness, which not only improves its wear resistance, but also improves thermal conductivity and heat resistance. It makes the wear surface uniform and is less likely to produce sparks during friction. Ferrophosphorus containing 20% ​​phosphorus can be ground into ultrafine powder and can replace ultrafine zinc powder as a coating. Ferrophosphorus is also a protective substance against radioactive radiation.