| CSP热轧板卷边部裂纹成因及控制 |
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| 引用本文： | 焦国华,吴光亮,孙彦辉,成小军,周春泉.CSP热轧板卷边部裂纹成因及控制[J].钢铁,2006,41(6):27-31. |
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| 作者姓名： | 焦国华 吴光亮 孙彦辉 成小军 周春泉 |
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| 作者单位： | 涟源钢铁集团公司炼钢厂,湖南,娄底,417009;涟源钢铁集团公司炼钢厂,湖南,娄底,417009;钢铁研究总院冶金工艺研究所,北京,100081;北京科技大学冶金与生态工程学院,北京,100083 |
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| 摘 要： | 为了抑制CSP热轧板卷边部裂纹,对CSP热轧板卷边部裂纹的成因进行了研究.CSP热轧板卷边部裂纹缺陷主要有3类:边部横裂纹、边部纵裂纹、边部烂边或掉块等.板卷产生边部裂纹的主要原因是:连铸坯表面边部横裂纹(包括深的振痕)和边部的细小纵裂纹,在加热和轧制过程中不断扩展;钢液在凝固以及铸坯在冷却、均热、轧制、层流冷却和卷取等过程中的热应力、机械应力以及相变应力等作用力超过钢的塑性变形抗力.抑制CSP热轧板卷产生边部裂纹的主要措施是:控制好合适的钢水成分;制定有效的工艺参数,如结晶器热流密度、结晶器振动参数、二冷冷却强度等.工业试验结果表明,CSP热轧板卷边部裂纹率由7.93%降低到1.81%.
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| 关 键 词： | 热轧板卷 边部裂纹 裂纹指数 |
| 文章编号： | 0449-749X（2006）06-0027-05 |
| 修稿时间： | 2005-09-02 |
Reason and Control of Edge Cracking of CSP Hot-Rolled Strip |
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| JIAO Guo-hua,WU Guang-liang,SUN Yan-hui,CHENG Xiao-jun,ZHOU Chun-quan.Reason and Control of Edge Cracking of CSP Hot-Rolled Strip[J].Iron & Steel,2006,41(6):27-31. |
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| Authors: | JIAO Guo-hua WU Guang-liang SUN Yan-hui CHENG Xiao-jun ZHOU Chun-quan |
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| Affiliation: | 1. Steelmaking Plant, Lianyuan Iron and Steel Group Co. , Loudi 417009, Hunan, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. Metallurgical Department, Central Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | The edge cracking of hot-rolled strip was investigated.The results showed that edge cracks can be divided in three types,namely, horizontal crack,vertical crack and edge concave.The main reasons of the edge cracking are: expanding of horizontal cracks(including deep oscillation imprint) and fine vertical cracks of cast blank during reheating and hot rolling;cracking due to thermal and mechanical stress caused in solidification,soaking,hot rolling,laminar cooling and coiling.The main measures of control are: reasonable control of steel composition;determination and maintenance of processing parameters,such as density of heat flow,oscillation parameter,and intensity of secondary cooling.The results of industrial test showed that the edge crack index was decreased from 7.93% to 1.81% by implementation of above mentioned measures. |
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| Keywords: | hot-rolled coil edge crack crack index |
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