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为了研究高碳含硫铝镇静钢中夹杂物的控制策略,利用ASPEX自动扫描电镜研究了钙处理对高碳铝镇静钢中夹杂物形貌、成分等特征的影响。结果表明,钙处理后夹杂物并未由LF精炼结束时的MgO·Al_2O_3转变为低熔点钙铝酸盐,而是转变为x(MgO·Al_2O_3)·(1-x)CaS复杂成分体系,夹杂物中MgO/Al_2O_3的质量比维持在1∶3不变。原因在于,钢液中w([S])/w(T[O])比较高,导致钙主要与硫结合生成CaS,而较少参与MgO·Al_2O_3的改性;精炼渣碱度低使得钙无法还原MgO。在此基础上对钙处理时夹杂物的生成与转变机理进行了讨论。
In order to study the control strategy of inclusions in high carbon and sulfur aluminum killed steel, the influence of calcium treatment on the features of inclusions in high carbon aluminum killed steel was studied by ASPEX automatic scanning electron microscope. The results show that the inclusions did not change from MgO · Al 2 O 3 at the end of LF refining to low melting point calcium aluminate, but transformed to the complex composition system of x (MgO · Al 2 O 3) · (1-x) CaS with inclusion Material mass ratio of MgO / Al_2O_3 maintained at 1: 3 unchanged. The reason is that w ([S]) / w (T [O]) in the molten steel is relatively high, resulting in calcium being mainly combined with sulfur to form CaS and less involved in the modification of MgO · Al 2 O 3; Unable to restore MgO. On this basis, the formation and transformation mechanism of inclusions in calcium treatment are discussed.