Genetic analysis and control of the surface white sliver defect on the cold-rolled non-oriented silicon steel
GONG Jian1,2，WANG Xian-hui2，LI Xian-hao2，ZHU Jiang-bo2，ZHAO Yan-yu2，BAO Yan-ping1
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing， 100083， China 2. Qian’an Iron and Steel Company， Shougang Co.， Ltd.， Qian’an 064404， Hebei， China）
Abstract：A kind of white sliver defect appeared on the cold-rolled sheet surface of non-oriented electrical steel was systematically investigated in this paper， by performing the scanning electron microscopy (SEM) observation， slab scarfing examination， slab surface pickling treatment and the stopper blowing-argon experiment. The results show that the white sliver defect is originated from mold slag entrapment， which is related to the activation degree of the molten steel flow and the melting status of the powder. By appropriately increasing the blowing argon flow rate of the stopper， increasing the casting speed and optimizing the physical properties of the mold powder， the occurrence of white sliver defect rate on the cold-rolled sheet surface is reduced from 88% to 8%.
龚 坚，王现辉，黎先浩，朱江波，赵艳宇，包燕平. 冷轧无取向硅钢表面白线缺陷成因分析与控制[J]. 钢铁, 2016, 51(1): 46-51.
GONG Jian，，WANG Xian-hui，LI Xian-hao，ZHU Jiang-bo，ZHAO Yan-yu，BAO Yan-ping. Genetic analysis and control of the surface white sliver defect on the cold-rolled non-oriented silicon steel. Iron and Steel, 2016, 51(1): 46-51.
何忠治，电工钢[M]，北京： 冶金工业出版社，1997. HE Zhong-zhi, Electrical Steel[M]. Beijing: Metallurgical Industry Press, 1997.
[1]
何忠治，电工钢[M]，北京： 冶金工业出版社，1997. HE Zhong-zhi, Electrical Steel[M]. Beijing: Metallurgical Industry Press, 1997.
[2]
黄璞，毛炯辉，陈卓，杨贤诚，我国冷轧无取向硅钢生产与技术水平的研究， 第七届中国钢铁年会论文集，中国金属学会，北京： 冶金工业出版社，2009.HUANG Pu, MAO Jiong-hui, CHEN Zhuo et al. Research on the cold-rolled non-oriented silicon steel production and technical level of China. 2009CSM annual meeting proceedings, Beijing: Metallurgical Industry Press, 2009.
[2]
黄璞，毛炯辉，陈卓，杨贤诚，我国冷轧无取向硅钢生产与技术水平的研究， 第七届中国钢铁年会论文集，中国金属学会，北京： 冶金工业出版社，2009.HUANG Pu, MAO Jiong-hui, CHEN Zhuo et al. Research on the cold-rolled non-oriented silicon steel production and technical level of China. 2009CSM annual meeting proceedings, Beijing: Metallurgical Industry Press, 2009.
[3]
王畅，于洋，徐海卫等，连退板表面白线缺陷成因和控制措施[J]. 轧钢，2014,31（10）：55.WANG Chang, YU Yang, XU Hai-wei et al. Analysis of the formation reasons and control measures of white line defect on continuous annealing strip [J]. Steel Rolling, 2014,31（10）：55.
[3]
王畅，于洋，徐海卫等，连退板表面白线缺陷成因和控制措施[J]. 轧钢，2014,31（10）：55.WANG Chang, YU Yang, XU Hai-wei et al. Analysis of the formation reasons and control measures of white line defect on continuous annealing strip [J]. Steel Rolling, 2014,31（10）：55.
[4]
彭其春，赵金涛，田俊等. 武钢冷轧板表面黑线缺陷分析[J]. 中国冶金，2010，20（1）21.PENG Qi-chun, ZHAO Jin-tao, TIAN Jun et al. Analysis of surface black line defect in cold-rolled sheet at WISCO[J], China Metallurgy , 2010,20(1)21.
[4]
彭其春，赵金涛，田俊等. 武钢冷轧板表面黑线缺陷分析[J]. 中国冶金，2010，20（1）21.PENG Qi-chun, ZHAO Jin-tao, TIAN Jun et al. Analysis of surface black line defect in cold-rolled sheet at WISCO[J], China Metallurgy , 2010,20(1)21.
[5]
齐海峰，唐广波，王晓春等.无取向电工钢线状表面缺陷分析[J]. 钢铁钒钛，2012，33（4）96.QI Hai-feng, TANG Guang-bo, WANG Xiao-chun et al. Study on surface linear defects of non-oriented electrical steel strip[J], Iron Steel Vanadium Titanium, 2012,33(4)96.
[5]
齐海峰，唐广波，王晓春等.无取向电工钢线状表面缺陷分析[J]. 钢铁钒钛，2012，33（4）96.QI Hai-feng, TANG Guang-bo, WANG Xiao-chun et al. Study on surface linear defects of non-oriented electrical steel strip[J], Iron Steel Vanadium Titanium, 2012,33(4)96.
[6]
彭其春，田俊，尹会芳等. 冷轧板表面线状缺陷成因分析与探讨[J]. 武汉科技大学学报，2009,32（2）15.PENG Qi-chun，TIAN Jun，YIN Hui-fang et al. Cold rolled plate surface linear defect cause analysis and discussion [J]. Journal of Wuhan University of Science and Technology, 2009,32(2)15.
[6]
彭其春，田俊，尹会芳等. 冷轧板表面线状缺陷成因分析与探讨[J]. 武汉科技大学学报，2009,32（2）15.PENG Qi-chun，TIAN Jun，YIN Hui-fang et al. Cold rolled plate surface linear defect cause analysis and discussion [J]. Journal of Wuhan University of Science and Technology, 2009,32(2)15.
[7]
孙彬，曹光明，贾涛等. 热轧高强钢氧化铁皮演变规律的研究[J]. 钢铁，2010,45（11）53. SUN Bin, CAO Guang-ming, JIA Tao et al. Study on evolution law of oxide scale of hot-rolled high strength steel [J]. Iron and Steel, 2010，45（11）54.
[7]
孙彬，曹光明，贾涛等. 热轧高强钢氧化铁皮演变规律的研究[J]. 钢铁，2010,45（11）53. SUN Bin, CAO Guang-ming, JIA Tao et al. Study on evolution law of oxide scale of hot-rolled high strength steel [J]. Iron and Steel, 2010，45（11）54.
[8]
CUI Heng, WU Hua-jie, YUE Feng et al. Surface Defects of Cold-Rolled Ti-IF Steel Sheets due to Non-Metallic Inclusions [J]. Journal of Iron and Steel Research (International), 2011,18(supplement 2)335.
[8]
CUI Heng, WU Hua-jie, YUE Feng et al. Surface Defects of Cold-Rolled Ti-IF Steel Sheets due to Non-Metallic Inclusions [J]. Journal of Iron and Steel Research (International), 2011,18(supplement 2)335.
[9]
ZHANG Qiao-ying, WANG Xin-hua, ZHANG Jiong-ming. Influence of casting speed variation during continuous casting on non-metallic inclusions in IF steel slabs[C], Asia Steel International Conference, 2006, 198.
[9]
ZHANG Qiao-ying, WANG Xin-hua, ZHANG Jiong-ming. Influence of casting speed variation during continuous casting on non-metallic inclusions in IF steel slabs[C], Asia Steel International Conference, 2006, 198.
[10]
LU Qiao-tong, YANG Rong-guang, WANG Xin-hua et al. Water modeling of mold powder entrapment in slab continuous casting mold [J]. Journal of University of Science and Technology Beijing, 2007,14(5)399.
[10]
LU Qiao-tong, YANG Rong-guang, WANG Xin-hua et al. Water modeling of mold powder entrapment in slab continuous casting mold [J]. Journal of University of Science and Technology Beijing, 2007,14(5)399.
[11]
孙云虎，罗传清，王延峰等.低碳钢板坯表面夹渣的研究与控制[J]. 炼钢，2013,29（5）30. SUN Yun-hu, LUO Chuan-qing, WANG Yan-feng et al. Research and control of surface inclusion in low-carbon steel slab [J], Steelmaking, 2013,29（5）30.
[11]
孙云虎，罗传清，王延峰等.低碳钢板坯表面夹渣的研究与控制[J]. 炼钢，2013,29（5）30. SUN Yun-hu, LUO Chuan-qing, WANG Yan-feng et al. Research and control of surface inclusion in low-carbon steel slab [J], Steelmaking, 2013,29（5）30.
[12]
曾亚南，孙彦辉，艾西等.结晶器保护渣对300mm×360mm低碳连铸坯表面质量影响和成分优化[J]. 特殊钢，2014，35（4）24.ZENG Ya-nan, SUN Yan-hui, AI Xi et al. Effect of mold powder on surface quality of 300mm×360mm casting bloom of low carbon steel and ingredient optimization [J]. Special Steel, 2014，35（4）24.
[12]
曾亚南，孙彦辉，艾西等.结晶器保护渣对300mm×360mm低碳连铸坯表面质量影响和成分优化[J]. 特殊钢，2014，35（4）24.ZENG Ya-nan, SUN Yan-hui, AI Xi et al. Effect of mold powder on surface quality of 300mm×360mm casting bloom of low carbon steel and ingredient optimization [J]. Special Steel, 2014，35（4）24.
[13]
赵和明，中薄板坯高速浇铸亚包晶钢控制纵裂纹和凹陷的研究，北京：北京科技大学博士学位论文，2006.4.ZHAO He-ming. Study on controlling longitudinal crack and depression of hypo-peritectic steel for medium thickness slab caster. PhD thesis, University of Science and Technology Beijing.
[13]
赵和明，中薄板坯高速浇铸亚包晶钢控制纵裂纹和凹陷的研究，北京：北京科技大学博士学位论文，2006.4.ZHAO He-ming. Study on controlling longitudinal crack and depression of hypo-peritectic steel for medium thickness slab caster. PhD thesis, University of Science and Technology Beijing.
2016, Vol. 51 
