GCr15轴承钢BOF-LF-RH-CC流程夹杂物的生成及演变

doi:10.13228/j.boyuan.issn0449-749x.20220171

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Abstract To study the evolution of inclusions in GCr15 bearing steel, the GCr15 bearing steel produced by BOF-LF-RH-CC process was sampled in various stages in a steel factory. The evolution behavior of inclusions in various processes was systematically analyzed by ASPEX scanning electron microscopy and thermodynamic calculation. The result indicates that due to the strong deoxidation of aluminum after the converter, at the beginning of LF refining, the inclusions in molten steel consists of MgO-Al₂O₃ binary system and CaO-MgO-Al₂O₃ ternary system with high Al₂O₃(w(Al₂O₃)=84%); the account of MgO-Al₂O₃ binary system and CaO-MgO-Al₂O₃ ternary system are 74% and 26% at the end of LF refining. At this moment, the inclusions in the liquid steel have a size distribution from 1 to 6 μm account for 87%. During refining from LF to RH, the total number of inclusions decreased from 198 pcs/(20 mm²) at the end of ladle furnace refining to 103 pcs/(20 mm²) at the end of RH vacuum degassing, a drop of 48%. Among them, MgO-Al₂O₃ binary system were mainly generated during LF refining, and then removed during RH refining, specifically, the number increased from 88 pcs/(20 mm²) at the beginning of LF refining to 139 pcs/(20 mm²) at the end of LF refining, and after the end of RH soft blowing, it was reduced to 4 pcs/(20 mm²); CaO-MgO-Al₂O₃ ternary system were mainly generated during RH refining, and their number increased from 49 pcs/(20 mm²) at the end of ladle furnace refining to 108 pcs/(20 mm²) at the end of RH soft blowing. This shows that RH vacuum refining has a better effect on inclusion removal. Thermodynamic calculations show that the contents of Al_s and Mg in the liquid steel are in the MgO-Al₂O₃ inclusion formation region during the secondary refining process, indicating that MgO-Al₂O₃ inclusions are easier to form; When w([Mg])in the liquid steel is 0.000 3% and w([Ca]) is greater than 0.000 25%, the thermodynamic conditions for the transformation of MgO-Al₂O₃ inclusions into CaO-MgO-Al₂O₃ inclusions are satisfied. When w([Al_s]) is 0.022%, w([Ca])is controlled between 0.000 25% and 0.007 00%,which is more conducive to the formation of liquefied calcium aluminate. During the test, w([Ca]) in the liquid steel was about 0.000 1%-0.000 4%, and the inclusions were mostly converted into CaO-MgO-Al₂O₃ ternary system.

Key words： GCr15 inclusions bearing steel refining evolution

Received: 14 March 2022

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	WANG Kang-hao
	JIANG Min
	LI Kai-lun
	WANG Xin-hua

Cite this article:

WANG Kang-hao,JIANG Min,LI Kai-lun等. Formation and evolution of inclusions in GCr15 bearing steel produced by process of BOF-LF-RH-CC[J]. Iron and Steel, 2022, 57(10): 64-72.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220171 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I10/64

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