电渣重熔过程电源频率对电渣锭洁净度的影响

doi:10.13228/j.boyuan.issn0449-749x.20210735

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Abstract In the process of electroslag remelting, low-frequency power supply can improve power factor, reduce power consumption and realize three-phase balance of power system. However, the influence of power frequency on the metallurgical quality of electroslag ingot, especially the cleanliness, is still lack of sufficient data support. Based on the small-scale low-frequency electroslag remelting experiments in the laboratory, the effects of different power supply frequencies, especially low supply frequencies on the cleanliness of ingot were studied and the effect lows of power frequencies on chemical composition, oxygen and nitrogen content, inclusion distribution in the 304 austenitic stainless steel and GCr15 bearing steel electroslag ingots were analyzed in detail. The results show that compared with power frequency electroslag remelting, when low frequency (2, 1, 0.4, 0.1 Hz) electroslag remelting is adopted for both stainless steel and bearing steel (other experimental parameters such as the composition and weight of slag, smelting current and voltage, remelting atmosphere etc, are exactly the same), the oxygen content in electroslag ingots increases greatly, both between 0.010% and 0.013%. But the frequency variation has little effect on nitrogen content. The content of aluminum in electroslag ingot also increases significantly, while other chemical compositions change little. Correspondingly, the number of inclusions in low frequency electroslag ingot also increases significantly, and the increased inclusions are mainly alumina. However, the inclusions are mainly small inclusions less than 10 μm, the large inclusions increase slightly, but the number is very small. The main reason for increase of oxygen content is that the DC effect of low-frequency power supply causes the electrolysis of alumina in the remelting slag pool (30% Al₂O₃+70% CaF₂ slag system) which leads to the increase of aluminum and oxygen content. The total oxygen content of ESR ingot increases when the aluminum and oxygen formed by alumina electrolysis enter the molten metal pool. With the cooling and solidification of metal pool, oxygen and aluminum form alumina inclusions, which remain in the electroslag ingot. The DC electrolysis effect of low-frequency power supply in industrial production needs to be further analyzed.

Key words： electroslag remelting low frequency oxygen stainless steel bearing steel

Received: 30 November 2021

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	CHANG Li-zhong
	SU Yun-long
	ZHANG Long-fei
	ZHU Chun-li
	XU Tao
	SHI Xiao-fang

Cite this article:

CHANG Li-zhong,SU Yun-long,ZHANG Long-fei等. Influence of power frequency on cleanliness of electroslag ingot during electroslag remelting process[J]. Iron and Steel, 2022, 57(7): 43-53.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210735 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I7/43

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