金属热处理 ›› 2021, Vol. 46 ›› Issue (5): 262-266.DOI: 10.13251/j.issn.0254-6051.2021.05.046

• 测试与分析 • 上一篇    下一篇

65Mn宽钢带冷轧边裂原因分析及预防

金亚军, 王闯, 窦晓尧, 黄爱军, 黄永恒   

  1. 浙江龙盛薄板有限公司, 浙江 绍兴 312369
  • 收稿日期:2020-10-26 出版日期:2021-05-25 发布日期:2021-07-21
  • 作者简介:金亚军(1992—),男,工程师,硕士,主要研究方向为高强钢强韧化,E-mail:jinyjustb@163.com。

Cause analysis and prevention of edge cracks in cold-rolled 65Mn wide steel strip

Jin Yajun, Wang Chuang, Dou Xiaoyao, Huang Aijun, Huang Yongheng   

  1. Zhejiang Lonsen Steel Strip Co., Ltd., Shaoxing Zhejiang 312369, China
  • Received:2020-10-26 Online:2021-05-25 Published:2021-07-21

摘要: 利用金相观察、硬度检测等手段对65Mn宽钢带冷轧过程出现的边裂问题进行了原因分析和研究。结果表明:65Mn钢热轧原料组织为铁素体+珠光体,但由于在热轧水冷过程中边部冷却速度比中间快,珠光体组织片层相对更细。在两相区球化退火过程中,边部较细的珠光体组织更容易被脆性较大的粗珠光体组织所取代。在相对较大的冷轧压下率条件下,造成边部出现裂口。将一次退火工艺由两相区球化退火优化调整为亚温球化退火后,65Mn钢带边部组织球化率显著提高,基本避免了边裂情况的产生,并为实际工业生产提供了积极的指导作用。

关键词: 65Mn钢, 冷轧, 边裂, 球化退火

Abstract: Causes of edge cracks in cold-rolled 65Mn wide steel strip were studied by metallographic observation and hardness test. The results show that the microstructure of the hot-rolled steel strip is ferrite and pearlite, the pearlitic structure in the edge region is relatively thinner than that in the middle region due to faster water-cooling rate. During the intercritical spheroidizing annealing process, these finer pearlites become brittle coarse pearlite more easily, and under the condition of relatively large cold rolling reduction, the edge cracks appear. By substituting the intercritical spheroidizing annealing to subcritical spheroidizing annealing, the microstructure spheroidization rate at the edge of the 65Mn steel strip is significantly increased, and basically avoiding the occurrence of edge cracks, so that providing positive guidance for the industrial production.

Key words: 65Mn steel, cold rolling, edge crack, spheroidizing annealing

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