连铸工艺对轴承钢大方坯凝固结构及其棒材碳化物带影响

doi:10.13228/j.boyuan.issn1006-9356.20220983

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Abstract To control the extremely harmful carbide bandings segregation in as-rolled bearing steel, the effect of casting process parameters on the spot-segregation in the initial solidification structure had been studied. It is realized that the semi-macrosegregation in the as-cast steel equiaxed crystal zone are the source of the band defects in the following rolled products. Accordingly, the spot segregation in bearing steel bloom casting and banded segregation defects in the rolled bar were experimentally studied to reveal the differences in size, quantity, and composition under different casting processes. The morphology and distribution of the spot-segregation in the experimental bloom castings were studied using hot-acid etching, dendritic etching, electron-probe micro-analysis (EMPA), and statistical calculations. It is found that there is different size of spot-segregation in the equiaxed crystal zone of the high-carbon chromium bearing steel bloom, in which severe positive segregation of C and Cr elements is observed. By a set of improved continuous casting processes with higher superheat, turned-off M-EMS and nozzle installation in 45° direction, the equiaxed crystal rate is reduced by 26.80 percent point compared with the original process. The maximum size of spot-segregation in equiaxed crystal zone is reduced from 3.94 mm to 1.45 mm in the control group, and the number of spot-segregation is reduced from 314 to 54. The maximum average bandwidths of the carbide bandings in process 1 and 2 are reduced from 105.75 μm to 57.25 μm and 75.75 μm, respectively. As a result, the qualified rate based on product carbide bandings evaluation is significantly improved.

Key words： bearing steel bloom casting solidification structure spot-segregation carbide bandings

Received: 20 December 2022

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	Articles by authors
	SHEN Tengfei
	ZHANG Zhuang
	NIU Shuai
	JIANG Ye
	WANG Dejiong
	ZHANG Jiaquan

Cite this article:

SHEN Tengfei,ZHANG Zhuang,NIU Shuai等. Effect of casting process on bloom solidification structure of bearing steel and following as-rolled carbide bandings[J]. China Metallurgy, 2023, 33(6): 54-64.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20220983 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I6/54

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