Abstract：In order to investigate the effect of magnesium treatment on inclusions in 40Cr Al-killed steel, the industrial test of magnesium treatment was carried out in 120 t ladle. The stable region diagram of inclusions under the condition of the composition of molten steel in the test furnace was calculated by using the FactSage thermodynamics software. The modification path of inclusions treated by magnesium is: Al2O3→Al2O3+MgO·Al2O3→MgO·Al2O3→MgO+MgO·Al2O3→ MgO+MgS. The influence of magnesium on the morphology, size, and composition of inclusions in 40Cr Al killed steel was analyzed by means of the metallographic microscope and ASPEX-explorer automatic scanning electron microscope. The results show that after the magnesium treatment, the size and quantity of inclusions in the billet are significantly reduced compared with the sample without magnesium, the size is mainly distributed from 0 to 3 μm, the inclusion density and the ratio of length to width of inclusions are significantly reduced; the ratio of the equivalent diameter of inclusions in steel from 0 to 3 μm is larger than that in the sample without magnesium, indicating that the magnesium treatment has the effect of dispersion and morphology control on inclusions in 40Cr aluminum killed steel. The inclusions in the magnesium treated 40Cr Al-killed steel are mainly MnS wrapped MgO·Al2O3 composite inclusions, while the inclusions in the contrast furnace steel are mainly MnS, Al2O3-MnS, and calcium aluminate inclusions.
焦魁明. 镁处理对40Cr铝镇静钢中夹杂物的影响[J]. 钢铁, 2020, 55(12): 39-45.
JIAO Kui-ming. Effect of magnesium treatment on inclusions in 40Cr Al-killed steel[J]. Iron and Steel, 2020, 55(12): 39-45.
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2020, Vol. 55 
