Low Phosphorus Steels Technology in Converter
The effects of the volume of phosphorus incoming and expenses, the amount of accessories feed to the converter, the remaining slag operation, the end temperature of smelting and carbon content on dephosphorization in the process of converter smelting were analyzed, and the effects of dephosphorization were determined by the analysis of dephosphorization technology factors. The results show that the phosphorization in converter is derived from liquid iron primarily with the ratio of 96%, followed by steel scrap and return mine. The phosphorus expenses is major in slag expenses, the ratio achieves 97.42%. The rate of dephosphorization considerably grows with the increase of slag quantity in converter. The remaining slag operation can make early slag more conducive to dephosphorization to improve dephosphorization rate. The temperature of smelting steel end should control between 1 620~1 640 ℃, and the end carbon content controls between 0.03%~0.05%. Thus phosphorus content can achieve lower than 0.004%.