连铸板坯表面横裂纹形成机理及防止措施

特殊钢 ›› 2011, Vol. 32 ›› Issue (1): 19-22.

连铸板坯表面横裂纹形成机理及防止措施

牛山廷, 张兴中, 干勇

钢铁研究总院连铸技术国家工程研究中心，北京100081

收稿日期:2010-07-21 出版日期:2011-02-01 发布日期:2022-09-26
作者简介:牛山廷(1973-) ，男,博士后，山东工业大学毕业，连铸坯缺陷分析及其输送保温过程数值分析。

Formation Mechanism and Countering Measures for Transverse Surface Crack of Continuous Casting Slabs

Niu Shanting, Zhang Xingzhong, Gan Yong

Central Iron and Steel Research Institute, Beijing 100081

Received:2010-07-21 Published:2011-02-01 Online:2022-09-26

摘要/Abstract

摘要： 从第Ⅲ脆性区、振痕以及偏析3个方面分析探讨了连铸板坯表面横裂纹的形成机理,得出仅从第Ⅲ脆性区方面不足以解释裂纹的产生,还要考虑偏析以及引起应力集中的因素(如振痕、夹杂等)。在此基础上简要讨论总结了防止板坯横裂纹产生的措施:如铸坯矫直温度、晶界析出物、二冷区冷却速度和低C钢C%的控制;结晶器振幅、锥度和保护渣的改进,降低钢中S、P含量和提高Mn/S,降低结晶器弯月面的冷却速度和改善结晶器表面光洁度等。

Abstract: The formation mechanism for transverse surface crack of continuous casting slabs is analyzed and delved from three aspects- No3 brittle zone, oscillation mark and segregation. It is obtained that the brittlement of steel at No3 brittle zone is not enough to explain the formation of transverse surface crack, the segregation and the factors leading to stress concentration such as oscillation marks and inclusions are also taken into account. On this studied basis the measures to prevent the transverse surface crack of slab are discussed and simply summarized including controlling casting slab straightening temperature, precipitates at grain boundary, cooling rate at secondary cooling zone and C% in low carbon steel; improving oscillation amplitude and taper of mold, and mold powder； decreasing S and P content in steel, increasing Mn/S, decreasing cooling speed at mold meniscus and improving mold surface roughness factor.

牛山廷, 张兴中, 干勇. 连铸板坯表面横裂纹形成机理及防止措施[J]. 特殊钢, 2011, 32(1): 19-22.

Niu Shanting, Zhang Xingzhong , Gan Yong. Formation Mechanism and Countering Measures for Transverse Surface Crack of Continuous Casting Slabs[J]. Special Steel, 2011, 32(1): 19-22.

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