65号高碳钢小方坯重压下高拉速工艺应用

doi:10.13228/j.boyuan.issn1006-9356.20230549

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Abstract The core difficulty in achieving high casting speed in the production of high carbon hard wire steel is the internal quality control of casting billet. The heavy pressing technology of billet is a new technology that can improve the internal quality of hard wire steel produced by billet. In order to study the effect of heavy reduction for high carbon steel billet in the high casting speed production process, Guangxi Iron and Steel Group Co., Ltd. conducted single roll heavy reduction study on No.65 hard wire steel with 165 mm×165 mm cross-section billet. The research results based on a large number of engineering practices and model calculations indicate that the effective reduction range under single roll heavy reduction is between 0.40 and 0.79 for the center solid phase fraction. In the appropriate reduction range, single roll heavy reduction can simultaneously improve center porosity, center shrinkage, and center segregation. Single roll heavy reduction at position with central solid phase fraction less than 0.30 can lead to cracking and negative segregation during reduction, and the improvement effect on shrinkage is also poor. Moreover, after solidification, no ideal effect of "welding" shrinkage is found with single roll reduction of 15 mm. Within the effective reduction range, single roll heavy reduction is carried out, as the reduction amount increasing, the improvement of center segregation and shrinkage of billet becomes more obvious, but the reduction amount is limited by equipment capacity. Through model guidance and production practice, ultimately achieving stable production of high carbon hard wire steel with a cross-sectional area of 165 mm×165 mm at least 2.5 m/min.

Key words： billet high casting speed hard wire steel segregation single roll heavy reduction

Received: 14 September 2023

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	Articles by authors
	LI Jianke
	WU Yifan
	LIANG Richeng
	HE Yangkai
	GAO Wenxing
	QIAN Liang

Cite this article:

LI Jianke,WU Yifan,LIANG Richeng等. Application of high casting speed process under heavy reduction of No.65 high carbon steel billet[J]. China Metallurgy, 2024, 34(1): 90-98.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230549 OR http://www.zgyj.ac.cn/EN/Y2024/V34/I1/90

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