大规格AISI 4130连铸圆坯端面裂纹分析及改进措施

doi:10.13228/j.boyuan.issn1005-4006.20220017

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Abstract Crack formation mechanism and the slow cooling process of the cast billet were systematically studied for the problem of crack defects found on the end face of ø600 mm specifications AISI 4130 continuous cast billet after sawing. The research results show that after slow cooling, there are still large tissue and thermal stresses in the cast billet, and as the sawing progresses, stresses are concentrated, cracking and extending at the weakest point, thus forming stress cracks. By modifying the slow cooling pit, adding insulation caps at both ends of the pit and adjusting the slow cooling process of the continuous casting round billet, the internal stress of the billet was greatly reduced and the product qualification rate was significantly improved.

Key words： AISI 4130 continuous cast billet slow cooling stress cracking continuous casting

Received: 31 January 2022

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	LENG Yong-lei

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LENG Yong-lei. Analysis of endface cracks and improvement measures for large size AISI 4130 continuous casting billets[J]. CONTINUOUS CASTING, 2022, 41(2): 77-82.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220017 OR http://www.chinamet.cn/Jweb_lz/EN/Y2022/V41/I2/77

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