Sulfur has a unique role in improving steel quality and reducing processing costs.However,MnS is easily rolled into long strips in steel,resulting in anisotropy properties of steel.To reduce this detrimental effect of the long strip MnS,its morphology must be controlled to reduce its aspect ratio.The role of MnS in steel and its damage to steel properties,as well as the methods and effects of MnS morphology control,were reviewed.Currently,the common means of controlling MnS morphology is through the addition of modifiers and adjustment of the temperature and deformation in the hot working process.There are mainly two types of modifiers,one is an alloying element which is easily react with sulfur,such as Ca,Mg,RE,etc.,and the other is an alloying element reacting with manganese,such as Te.In the hot working process,the high temperature and suitable deformation are conducive to the control of MnS morphology.As the total oxygen content in the steel is continuously reduced,the influence of the oxide on the properties of the steel gradually diminishes,and the influence of sulphide is becoming increasingly important.Therefore,the issue of sulfides should be given sufficient attention,especially the influence of sulfide on the properties of ultra-low oxygen steel,which should be further studied.
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