金属热处理 ›› 2023, Vol. 48 ›› Issue (8): 272-275.DOI: 10.13251/j.issn.0254-6051.2023.08.044

• 失效分析 • 上一篇    下一篇

ER70S-6钢盘条冷拔断裂原因分析及工艺优化措施

范振霞1,2,3, 张育明1,2,3, 董庆1,2,3, 赵昊乾1,2,3, 李亚硕1,2,3, 魏巧灵1,2   

  1. 1.河北邢钢科技有限公司, 河北 邢台 054799;
    2.邢台钢铁有限责任公司, 河北 邢台 054027;
    3.河北省线材工程技术创新中心, 河北 邢台 054027
  • 收稿日期:2023-03-06 修回日期:2023-06-28 出版日期:2023-08-25 发布日期:2023-10-10
  • 作者简介:范振霞(1986—),女,高级工程师,硕士,主要研究方向为金属材料,E-mail: fzx202306@126.com
  • 基金资助:
    河北省省级科技计划(205676134H)

Cause analysis on cold drawing fracture of ER70S-6 steel coil and process optimization measures

Fan Zhenxia1,2,3, Zhang Yuming1,2,3, Dong Qing1,2,3, Zhao Haoqian1,2,3, Li Yashuo 1,2,3, Wei Qiaoling1,2   

  1. 1. Hebei Xinggang Technology Co., Ltd., Xingtai Hebei 054799, China;
    2. Xingtai Iron and Steel Co., Ltd., Xingtai Hebei 054027, China;
    3. Hebei Wire Engineering Technology Innovation Center, Xingtai Hebei 054027, China
  • Received:2023-03-06 Revised:2023-06-28 Online:2023-08-25 Published:2023-10-10

摘要: ER70S-6钢ø6.5 mm热轧盘条在冷拔中断裂,采用化学成分、力学性能以及显微组织检验测试了该批次盘条。结果表明,盘条中心存在马氏体组织、边部存在贝氏体组织是造成拉拔断裂的原因。通过进精轧温度由960 ℃降至920 ℃以及保温罩长度增加5 m,可有效减少心部马氏体的产生,避免边部贝氏体的产生,从而消除冷拔断裂现象。

关键词: ER70S-6钢盘条, 冷拔断裂, 马氏体, 贝氏体

Abstract: ER70S-6 steel ø6.5 mm hot-rolled coil fractured during cold drawing, and the batch of coils was tested by means of chemical composition, mechanical properties, and microstructure inspection. The results show that the martensite in the core and bainite at the edge of the coil are the causes of drawing fracture. The production of martensite in the core and bainite at the edge can be effectively reduced by reducing the entering temperature of finishing rolling from 960 ℃ to 920 ℃ and increasing the length of insulation cover by 5 m.

Key words: ER70S-6 steel coil, cold drawing fracture, martensite, bainite

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