Experimental Study on the Effect of Rare Earth on Inclusions in High-sulfur Free-cutting Steel

In order to explore the effect of rare earth on inclusions in high-sulfur free-cutting steel,the high temperature simulation experiments and thermodynamic analysis were carried out in this work.The results showed that the types of inclusions were MnS and CeAlO₃.MnS could precipitate on the surface of CeAlO₃to form complex inclusions,and the proportions of complex inclusions was about 3.01%.When the content of Ce was 0.05%,the main types of inclusions were MnS,Ce₂S₃ and CeAlO₃.MnS could wrap with Ce₂S₃ to form complex inclusions,and its proportions was about 5.11%.With the content of Ce increasing from 0.01%to 0.05%,the typeⅡchain-like MnS in steel significantly reduced,and the size of sulfide decreased.