High Level Material Ferro Phosphrus

The phosphorus content in Meishan Iron and Steel's molten iron is high, making it difficult to smelt low-ferro phosphorus. Through comparative analysis of the phosphorus reduction methods used at home and abroad, such as "hot metal pre-dephosphorization outside the furnace", "SRP method" and "converter double slag dephosphorization method", a method suitable for Meishan Iron and Steel's own characteristics was explored - the converter hot metal dephosphorization steelmaking process. By adopting the method of early slag making and mid-slag dumping in smelting, the mass fraction of phosphorus was reduced to ≤0.01%, meeting the requirements for producing low-phosphorus steel.

1.Diamond tools with high iron matrix were prepared by powder metallurgy. The effect of the amount of ferro phosphorus added on the performance of the high iron matrix was investigated by testing the hardness, density, impact toughness and other properties of the material. The effect of the amount of ferrophosphorus added on the microstructural changes of the matrix was revealed by X-ray diffraction patterns and metallographic images. The results show that with the increase of P-Fe content, the relative density of the matrix increases, and the hardness of the matrix increases almost linearly. The hardness of the matrix containing 3% ferrophosphorus is HRB97, while the hardness of the matrix containing 15% ferrophosphorus reaches HRB113. The bending strength and impact toughness of the matrix decrease with the increase of the amount of addition. The increase in brittleness is beneficial to improving the cutting performance of the matrix. The SEM observation results show that with the increase of the amount of P-Fe added, the fracture of the matrix is ​​a transition from brittle fracture to brittle fracture.

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