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下渣对钢中非金属夹杂物的影响实验研究
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Abstract:
电弧炉或转炉等初炼炉下渣后，下渣会对钢的洁净度产生影响。为了探索不同下渣率对钢中夹杂物的影响，采用MoSi2炉开展了5种下渣率、2种精炼渣的渣金平衡实验。结果表明，钢中非金属夹杂物种类主要是MgO？Al2O3和极少量的Ca-Mg-Al-O系夹杂物，夹杂物类型受下渣影响较小。随着下渣率从0增加到8%，复合MgO？Al2O3中w (MgO)随着下渣率的增加而减小，而包裹型夹杂外层MgO？Al2O3中w (MgO)随着下渣率的增加而增加，精炼前后夹杂物的数密度和面积比均增加，钢中尺寸在1 ≤ d < 2 μm区间的夹杂物所占比例逐渐降低。实验结果显示S13渣具有更好的精炼能力。
FeO in Slag carryover from primary smelting furnace such as EAF or BOF would affect the cleanliness of steel during refining. In order to explore the influence of various slag carryover ratios on inclusions in steel during refining process, slag-metal equilibrium experiments under five different slag carryover ratios and two different refining slag were carried out by utilizing MoSi2 furnace. The results showed that the types of inclusions were mainly MgO·Al2O3 and a small number of Ca-Mg-Al-O inclusions, and the types of inclusions were less affected by slag carryover conditions. With the increase of slag carryover ratio from 0 to 8%, the w (MgO) in composite MgO·Al2O3 decreased with the increase of slag carryover ratios, while the w (MgO) in the outer layer MgO·Al2O3 of the inclusion increased with the increase of slag carryover ratios. The number density and area ratio of inclusions increased before and after refining with the increase of slag carryover ratios, meanwhile the proportion of inclusions in the range of 1 ≤ d < 2 μm decreased gradually. S13 slag has the better refining ability.
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