改善齿轮钢SAE8620H碳偏析的连铸工艺研究及应用

doi:10.13228/j.boyuan.issn1005-4006.20220018

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Abstract Carbon macro-segregation of gear steel will aggravate the strip grade and affect the heat treatment deformation of gear. The most fundamental solution is to control the carbon segregation of continuous casting billet. Under the appropriate casting process speed, the technical means of optimizing the mold electromagnetic stirring parameters, dynamic end electromagnetic stirring, controlling the superheat of molten steel and optimizing the secondary cooling water distribution are adopted to improve the carbon segregation index and carbon range of continuous casting billet section. The results show that the selection of suitable continuous casting process parameters and dynamic end-stirring technology can substantially improve the internal quality of the cast billet and reduce the macroscopic carbon segregation of gear steel SAE8620H to the level of nine-point carbon polar difference no more than 0.025% and carbon segregation index 0.95-1.05, and effectively reduce the gear steel strip grade. At the same time, the heat treatment deformation of rolled round steel processed into gears is small and the deformation trend is good,The quality of products has been recognized by customers.

Key words： continuous casting process dynamic final electromagnetic stirring gear steel SAE8620H carbon macro-segregation

Received: 31 January 2022

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	YIN Xiu-gang

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YIN Xiu-gang. Research and application of continuous casting process for improving carbon segregation of gear steel SAE8620H[J]. CONTINUOUS CASTING, 2022, 41(2): 55-60.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220018 OR http://www.chinamet.cn/Jweb_lz/EN/Y2022/V41/I2/55

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