In this article, the industrial experiments of calcium treatment on the modification of inclusions in NM500 wear-resistant steel were carried out. There are four types of inclusions, which are Type A of Al2O3 based inclusions, Type C of inclusions containing CaO without S, Type S of inclusions containing S, and Type M of MnS. Three types of CaO·MgO·Al2O3 inclusions after calcium treatment are embedded MgO·Al2O3 + CaO·Al2O3, wrapped MgO·Al2O3 + CaO·Al2O3 and combined CaO·MgO·Al2O3 + MgO. There are four types of CaO·MgO·Al2O3·CaS inclusions of multilayer MgO·Al2O3 + CaO·MgO·Al2O3 + CaS, embedded MgO·Al2O3 + CaO·Al2O3 + CaS, wrapped CaO·MgO·Al2O3 + CaS and composite MgO·Al2O3 + CaO·Al2O3 + CaS·CaO·Al2O3 in the steel after calcium treatment.
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