低碳热轧板卷的表面黑线和翘皮缺陷形成机制

doi:10.13228/j.boyuan.issn1006-9356.20200501

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摘要为提升热轧板卷表面质量,利用金相显微镜、扫描电镜和电子背散射衍射等分析手段研究了翘皮和黑线两种典型缺陷。分析结果表明,热轧板表面黑线或翘皮缺陷微区成分主要由二次脱氧产物、钢包渣、保护渣等物质构成。结合表面缺陷附近的金相组织、夹杂成分和晶粒结构可以得出,热轧板表面缺陷的形成在炼钢过程主要受钢包渣或结晶器保护渣的卷入、铸坯皮下气孔、铸坯表面(边部)裂纹等影响;在轧制过程主要受氧化铁皮轧入、侧压定宽机参数不合理等影响。详细讨论了热轧板表面典型缺陷产生的位置和形成过程并给出建议。

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关键词 ：热轧板, 黑线, 翘皮, 缺陷, 轧制

Abstract：To improve the surface quality of hot rolled steel plates, the upwarping and black line defects were investigated by means of the metallographic microscope, scanning electron microscope and electron backscatter diffraction. The results showed that the micro area of surface upwarping and black line defects on the surface of the hot-rolled plate was mainly composed of secondary oxide particles, steelmaking slag and mould flux and so on. According to the metallographic structure, inclusion compositions and grains texture analysis, it could be concluded that surface defects on hot rolled plates were attributed to the entrapment of ladle slag and mould flux, gas bubbles or cracks of casting slab in the steelmaking process, rolled-in scale and unreasonable rolling parameters of side pressure width setting machine in the rolling process. Finally, the position and formation process of typical surface defects on hot rolled plates were discussed in detail, and suggestions were given.

Key words： hot-rolled plate black line upwarping defect rolling

收稿日期: 2020-08-25

基金资助:国家自然科学基金资助项目(51904086);河北省引进留学人员基金资助项目(C20200310);邯郸市科学技术研究与发展计划资助项目(19422111008-33)

作者简介: 赵烁(1984—), 男, 博士, 副教授; E-mail: zhaos418@hebeu.edu.cn

引用本文:

赵烁, 李祖树, 朱雨逸, 吕静彩. 低碳热轧板卷的表面黑线和翘皮缺陷形成机制[J]. 中国冶金, 2021, 31(4): 37-43. ZHAO Shuo, LI Zu-shu, ZHU Yu-yi, LÜ Jing-cai. Mechanism analysis of surface black line and upwarping defects on low carbon hot-rolled plate[J]. China Metallurgy, 2021, 31(4): 37-43.

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http://www.zgyj.ac.cn/CN/10.13228/j.boyuan.issn1006-9356.20200501 或 http://www.zgyj.ac.cn/CN/Y2021/V31/I4/37

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