金属热处理 ›› 2024, Vol. 49 ›› Issue (4): 34-37.DOI: 10.13251/j.issn.0254-6051.2024.04.006

• 材料研究 • 上一篇    下一篇

合金化镀锌双相钢DP980的研制开发

张亮1, 黄学启1, 刘李斌2, 李振1, 谢春乾2, 史昌1, 刘兴全1   

  1. 1.北京首钢股份有限公司, 北京 100041;
    2.首钢集团有限公司技术研究院, 北京 100043
  • 收稿日期:2023-10-17 修回日期:2024-02-26 出版日期:2024-04-25 发布日期:2024-05-27
  • 作者简介:张 亮(1980—),男,博士,主要研究方向为汽车钢产品开发与金属材料腐蚀,E-mail:zhangliang@shougang.com.cn

Research and development of galvannealing dual-phase steel DP980

Zhang Liang1, Huang Xueqi1, Liu Libin2, Li Zhen1, Xie Chunqian2, Shi Chang1, Liu Xingquan1   

  1. 1. Beijing Shougang Co., Ltd., Beijing 100041, China;
    2. Shougang Research Institute of Technology, Beijing 100043, China
  • Received:2023-10-17 Revised:2024-02-26 Online:2024-04-25 Published:2024-05-27

摘要: 在实验室试验研究的基础上,依托工业连续热镀锌(CGL)生产线成功开发了合金化镀锌双相钢DP980-GA产品。产品基体的微观组织由铁素体、马氏体及很少量的贝氏体组成;镀层相结构由靠近基体的厚度0.6 μm薄层Γ相、主体δ相和表层少量ζ相构成,镀层Fe含量适中,控制在10.5%左右。产品的力学性能表现出较低的屈强比(0.624)、良好的伸长率以及较好的扩孔率。量产产品已批量应用于A柱内板等零件,其屈服强度、抗拉强度、伸长率等指标具备良好的过程能力。

关键词: 合金化镀锌, DP980双相钢, 微观组织, 镀层相结构

Abstract: On the basis of laboratory test and research, galvannealed dual-phase steel DP980-GA was successfully developed relying on industrial continuous galvanizing line (CGL). The results show that microstructure of the steel substrate is composed of ferrite, martensite and a small amount of bainite. The phase structure of the coating is composed of thin Γ layer with 0.6 μm thickness near the substrate, principal phase δ and a small amount of ζ phase, where the Fe content in the coating is around 10.5%. The mechanical properties of the DP980-GA steel product show low yield ratio (0.624), good elongation and hole expansion ratio. The industrial mass produced products were applied to parts such as A pillar inner, of which the process capacity of yield strength, tensile strength and elongation is controlled stably.

Key words: galvannealing, DP980 dual-phase steel, microstructure, coating phase structure

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