横折缺陷机理模型及控制方法.pdfVIP

横折缺陷机理模型及控制方法 1 1 1 2 王丰祥 郭宏伟 邓天勇 宋振官 （1. 济钢热连轧厂，济南 250101 ，2. 济钢用户技术中心，济南 250101 ） 1 摘 要 针对济钢热轧中厚规格高强钢产品出现的横折缺陷，建立了横折缺陷机理模型，提出了相应的解 决措施。结果表明，横折缺陷随着屈服强度的降低和产品厚度的增大而增加；反向卷取比正向卷取容易产 生横折缺陷；增加平整工序和减少板形缺陷有利于减少横折缺陷的产生；横折模型计算结果与实测结果吻 合，具有较高精度。 关键词 分卷卷取 横折 屈服 Cross Breaks Defect Theory Model and Its Control Methods Wang Fengxiang1 Guo Hongwei1 Deng Tianyong1 Song Zhenguan2 (1. Process Technology Department, Hot Tandem Rolling Factory, Jinan Iron and Steel Co., Ltd., Jinan, 250101; 2. User Technology Center, Hot Tandem Rolling Factory, Jinan Iron and Steel Co., Ltd., Jinan, 250101) Abstract Cross brakes defect theory model is built and corresponding solving measures are brought forward in allusion to the cross breaks defects in high-strength medium-thickness products of Hot Tandem Rolling Factory, Jinan Iron and Steel Co., Ltd. The result indicates: cross breaks defects increases with the decrement of yield strength and the increment of the product thickness; cross breaks defects are more prone to appear in inverse coiling than that in forward coiling; it is propitious to decrease cross breaks defects by adding leveling working procedure and decreasing shape defects; the calculation result of the cross breaks model inosculates well with the measurement result and the model has high precision. Key words division coiler coiling, cross breaks, yield 1 引言 横折是热一种在轧板卷开卷过程中常见缺陷，在板卷的某个部位出现垂直于轧向的条状折痕，严重时贯 穿整个板宽，通过肉眼能够明显观察到条状凹凸状，且用手触摸有很明显的凹凸感，折印宽度在20~200mm 不等。横折大多出现在带钢的头尾部，短则十几米，长则几十米，严重时整支带钢表面都产生[1] 。国内很多 专家学者对此进行了深入研究。攀钢研究院王丹等[2]对热轧板横折缺陷的成因进行了分析，认为横折缺陷不 是板形引起的，而是由低碳钢普遍存在的屈服平台引起的。攀钢热轧板厂的朱涛