GCr15轴承钢连铸过程MgO·Al2O3夹杂物形成机理

张建斌; 徐建飞; 王昆鹏; 王郢; 杨谱; 陈廷军

doi:10.13228/j.boyuan.issn0449-749x.20220703

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钢铁 ›› 2023, Vol. 58 ›› Issue (5) : 83-91. DOI: 10.13228/j.boyuan.issn0449-749x.20220703

炼钢

GCr15轴承钢连铸过程MgO·Al₂O₃夹杂物形成机理

张建斌, 徐建飞, 王昆鹏, 王郢, 杨谱, 陈廷军

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Formation mechanism of MgO·Al₂O₃ inclusions in GCr15 steel in continuous casting

张建斌, 徐建飞, 王昆鹏, 王郢, 杨谱, 陈廷军

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摘要

为了研究GCr15轴承钢浇铸过程MgO·Al₂O₃夹杂物形成原因,以改善钢的可浇性,对LF结束、RH结束、中间包冲击区、中间包浇铸区进行夹杂物全流程分析。LF结束夹杂物主要为镁铝尖晶石,并含有少量钙铝酸盐夹杂物。RH真空处理后镁铝尖晶石夹杂物被高效化去除,钢液中仅剩少量低熔点和高熔点钙铝酸盐夹杂物,中间包浇铸时可以在钢液中检测到许多MgO·Al₂O₃夹杂物。采用不含氧化镁的中间包覆盖剂和铝质中间包内衬,在不改变连铸其他工艺参数条件下,中间包MgO·Al₂O₃夹杂物数量并没有得到显著降低,中间包钢液中仍然可以检测到许多MgO·Al₂O₃夹杂物,这说明中间包钢-渣-耐火材料间的反应并不是MgO·Al₂O₃夹杂物的生成原因。向铁质提桶取样器中加入成分以SiO₂、Cr₂O₃、Fe₂O₃为主的铬质引流砂,并利用该铁质提桶取样器对RH破空后钢水进行取样,尽管钢水总氧质量分数增加0.000 1%,但可以在所取的钢样中检测到许多MgO·Al₂O₃夹杂物,说明钢液的轻微氧化对MgO·Al₂O₃夹杂物形成具有重要的影响。通过分析中间包覆盖剂成分,发现浇铸过程覆盖剂碱度偏低,Cr₂O₃和FeO含量偏高,且同一炉钢水浇铸后期覆盖剂中Cr₂O₃、FeO含量较浇铸前期有所降低,说明浇铸过程覆盖剂会向钢水传氧,由此造成对钢液的氧化,因此,覆盖剂成分的稳定控制对于轴承钢MgO·Al₂O₃夹杂物的形成具有重要影响。

Abstract

The compositions of inclusions were analyzed in GCr15 steel in LF refining, RH degassing and continuous casting. The inclusions were composed of MgO·Al₂O₃ with a small amount of calcium aluminate after LF refining. Many MgO·Al₂O₃ inclusions were detected in the continuous casting although the inclusions were calcium aluminate after RH degassing. Using Al₂O₃-based tundish working lining and low content of MgO covering flux, and unchanging other parameters of continuous casting, MgO·Al₂O₃ inclusions were also be detected in large numbers in the tundish, indicating the reaction of steel-slag-refractory in the tundish was not the mainly reason for the formation of MgO·Al₂O₃ inclusions. However, many MgO·Al₂O₃ inclusions could be detected when the molten steel without MgO·Al₂O₃ inclusions reacted with the packing sand with high contents of SiO₂, Cr₂O₃ and Fe₂O₃, which means the slight oxidation of molten steel could lead to the formation of MgO·Al₂O₃ inclusions. High contents of FeO and Cr₂O₃were found in the tundish flux and decreased with the casting goes on, indicating the existence of the reactions between Al in the molten steel and FeO, Cr₂O₃in the tundish flux, which leads to the oxidation of molten steel. Therefore, the composition control of tundish flux was important to the formation of MgO·Al₂O₃ inclusions.

关键词

轴承钢 / 连铸 / MgO·Al₂O₃ / 氧化 / 中间包 / 覆盖剂

Key words

GCr15 / continuous casting / MgO·Al₂O₃ / oxidation / tundish / covering flux

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张建斌, 徐建飞, 王昆鹏, 等. GCr15轴承钢连铸过程MgO·Al₂O₃夹杂物形成机理[J]. 钢铁, 2023, 58(5): 83-91 https://doi.org/10.13228/j.boyuan.issn0449-749x.20220703

ZHANG Jian-bin, XU Jian-fei, WANG Kun-peng, et al. Formation mechanism of MgO·Al₂O₃ inclusions in GCr15 steel in continuous casting[J]. Iron and Steel, 2023, 58(5): 83-91 https://doi.org/10.13228/j.boyuan.issn0449-749x.20220703

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