通过对钢轨A类非金属夹杂进行不同深度、不同位置的取样检测,发现钢轨A类非金属夹杂评级结果存在一定偶然性.以U75V为例进一步采用Factsage热力学数值模拟及析出热力学理论对MnS非金属夹杂的析出过程进行分析;结合连铸过程钢液冷却凝固特性及实际统计、检测结果对MnS非金属夹杂的析出进行验证,最终得出MnS析出于钢液近乎完全凝固,且主要由于S、Mn偏析形成微区高溶质浓度而析出.以降低钢液氧、氮含量为基础,降低钢液硫含量、夹杂变性处理及铸坯内部质量优化可以抑制MnS非金属夹杂的析出及轧制形变.
Through measuring type-A non-metallic inclusion of sample taken from different depths and location in the steel rail,we found out that that the result is contingent.In this paper taking U75V steel rail as researching object,the separation of MnS in rail steel had been predicted by Factsage software and thermodynamic calculation,,and verified by combining the solidification characteristic of molten steel in the casting process with results of produce statistics and actual testing.It is found out that MnS separates from the nearly full solidified liquid steel,and mainly caused by segregation of S and Mn while molten steel solidifying.Based on the control of decreasing the content of [O] ％、[N] ％,decreasing the content of [S] ％ and try to make modification for MnS with Ca or Ti and improve the quality of billets,can help to prevent MnS segregation and deformation while subjecting to rolling.
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