Iron Phosphorus

Phosphorus is the chemical element No. 15, symbol P. In the third period of the periodic table, group VA. Elemental phosphorus has three variants of white phosphorus, red phosphorus and black phosphorus. Among them, white phosphorus or yellow phosphorus is a colorless or light yellow transparent crystalline solid. The density is 1.82g/㎝³. The melting point is 44.1°C, the boiling point is 280°C, and the ignition point is 40°C. Phosphorescence is emitted in the dark. It smells bad. Very toxic. White phosphorus is almost insoluble in water and easily soluble in carbon disulfide solvent. It will become black phosphorus when heated under high pressure, and its density is 2.70g/㎝³, which is slightly metallic. The ionization energy is 10.486 eV. Generally insoluble in common solvents. White phosphorus can be converted into red phosphorus after being placed or heated at 250°C in isolated air for several hours or exposed to light. Red phosphorus is a red-brown powder, non-toxic, density 2.34g/㎝³, melting point 590℃ (under 43atm, melting point is 590℃, sublimation temperature 416℃), boiling point 280℃, ignition point 240℃. not soluble in water. In nature, phosphorus exists in the form of phosphate and is an important element of living bodies.



Phosphorus and iron can form a series of compounds: Fe3P, Fe2P, FeP and FeP2. Iron Phosphorus is mainly composed of Fe2P and Fe3P. Iron Phosphorus containing 18%-25% phosphorus has a melting temperature of 1250-1350℃ and a density of 5.8-6.5 g/cm³. Iron Phosphorus is a common ferroalloy, and most of the production of Iron Phosphorus is currently used in the foundry industry. It’s also known as ferro phosphorus Iron Phosphorus used in casting can improve the flowability of cast iron, thereby improving the quality of castings. Due to the high hardness of the phosphorus eutectic, the brake shoe of the truck contains 0.7%-1.0% phosphorus, which can improve its wear resistance.

Phosphorus can also improve and improve the cutting performance of steel, so Iron Phosphorus is also often used as an additive of phosphorus in the steelmaking industry. In general, phosphorus is a harmful substance to most steels. At that time, in some special steels, it can improve the corrosion resistance of steel. The use of phosphor-containing thin cast steel plates can prevent stickiness between the steel plates. When producing rolls, adding a small amount of phosphorus element can increase its fluidity and avoid surface cracks. When producing high phosphorus wear-resistant cast iron, phosphorus can form a uniform secondary phosphorus eutectic structure in the casting, and it is distributed in a network.