Effect of magnesium modification on sulfides in Y1Cr13 free-cutting stainless steel
WU Xiang-yu1, HE Yu-dong2, WU Liang-ping1, SHEN Ping1, FU Jian-xun1
1. Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. Sichuan Great Wall Special Steel Co., Ltd., Pangang Group, Mianyang 621000, Sichuan, China
Abstract：In order to study the modification effect of magnesium on sulfides in Y1Cr13 free-cutting stainless steel,the distribution,morphology and precipitation conditions of sulfides in steel before and after adding magnesium are analyzed by metallographic microscope,Image-Pro Plus image analysis software,scanning electron microscope and FactSage thermodynamic software. The results showed that adding a finite amount of magnesium in the Y1Cr13 free-cutting stainless steel can change Al2O3 into fine dispersed Al2O3·MgO,and the typical sulfides MnS in steel will precipitate with it as the core at 1 448 ℃,those formed MnS-Al2O3·MgO composite inclusions have internal soft and external hard structure. This structure makes MnS not easy to deform during rolling,and keeps spherical or ellipsoid shape in rolled products,and with the mass percent of magnesium,the precipitation temperature range of Al2O3·MgO will be larger,the precipitation amount will be more,and the improvement of MnS morphology will be more obvious. The sulfide grade decreased from fine line 5.5 and coarse line 4.5 before modification to fine line 3.5 and coarse line 1.0 after modification,and with the increase of its mass percent,the grade further decreased to fine line 2.5 and coarse line 0.5,and the rolling yield increased from 70% to 90%. Therefore,appropriately increasing the amount of magnesium is beneficial to improve its modification effect.
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2020, Vol. 55 
