ISSN：1003-8620

CN：42-1243/TF

主管：中信泰富特钢集团股份有限公司

主办：大冶特殊钢有限公司

特殊钢 ›› 2017, Vol. 38 ›› Issue (5): 61-64.

所属专题： 钢板

• 组织和性能 • 上一篇    下一篇

卷取后冷却工艺对700 MPa微合金钢带材组织和性能的影响

董方1, 武利平1, 宿成2, 闫瑞军1, 沈国慧3, 刘月1   

  1. 1. 内蒙古科技大学材料与冶金学院，包头 014010；
    2. 包钢(集团)公司研发销售部，包头 014010；
    3. 北京科技大学冶金与生态工程学院，北京 100083;
  • 收稿日期:2017-04-06 出版日期:2017-10-01 发布日期:2022-07-18
  • 作者简介:董方(1964-)，男，硕士(1995年北京科技大学)，教授，1987年东北大学(本科)毕业,钢铁冶金新工艺技术研究。

Effect of Cooling Process after Coiling on Structure and Properties of 700 MPa Microalloying Steel Strip

Dong Fang1 , Wu Liping1 , Su Cheng2 , Yan Ruijun1 , Shen Guohui3 , Liu Yue1   

  1. 1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010；
    2. Research and Sales Department, Baotou Iron and Steel Group Co, Baotou 014010；
    3. School of Metallurgy and Ecological Engineering, University of Science and Technology, Beijing 100083;
  • Received:2017-04-06 Published:2017-10-01 Online:2022-07-18

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摘要： 700 MPa微合金钢（/%:0.05C,0.18Si,1.80Mn,0.010P,0.003S,0.15Mo,0.10Ti,0.75Nb,0.035V,0.030Al,0.0020Ca）的冶炼工艺为240 t BOF-LF-2150 mm板坯连铸。通过利用金相显微镜、扫描电镜、能谱仪和拉力试验机试验了700 MPa级微合金高强钢轧后,10 mm钢带从600℃卷取时直接取样经3.7 h冷却至室温（25℃）的空冷工艺,和钢带600℃卷取后并堆放在一起经36.2 h缓慢冷却到室温（25℃）的缓冷工艺的组织和性能。结果得出缓冷工艺下,钢带的贝氏体较少,屈服强度高（732~740 MPa）、抗拉强度低（793~799 MPa）、伸长率大（21.0%~23.0%）;空冷工艺下,钢带的贝氏体较多,屈服强度低（647~654 MPa）、抗拉强度高（811~831 MPa）、伸长率较小（15.0%~17.0%）。综合分析,采用缓冷工艺钢带的力学性能要优于空冷钢带的力学性能。

关键词: Ti-Nb-V微合金高强钢, 钢带, 卷取, 空冷工艺, 缓冷工艺, 组织, 力学性能

Abstract: The steelmaking process of 700 MPa microalloying steel (/% : 0.05C, 0.18Si, 1.80Mn, 0.010P, 0.003S, 0.15Mo, 0.l0Ti, 0.075Nb, 0.035V, 0.030Al, 0.0020Ca) is 240 t BOF-LF-2150 mm slab casting. The structure and mechanical properties of hot-rolled 10 mm strip of 700 MPa microalloying high strength steel air-cooling processcoiling at 600℃. and direct sampling air-cooling for 3.7 h to ambient (25℃ ) and slow-cooling process-coiling at 600℃ and coils stacked slow-cooling for 36.2 h to ambient (25℃)are observed and tested by using optical microscope, scanning electron microscope, energy spectrometer and tensile tester. Results are obtained that with slow-cooling process the amount of bainite in steel strip is relatively less, the steel strip has higher yield strength (732~740 MPa) , lower tensile strength (793~799 MPa) and larger elongation (21.0% 〜23.0% ) ； and with air-cooling process the amount of bainite in steel strip is rather more, the steel strip has lower yield strength (647〜654 MPa) , higher tensile strength (811〜831 MPa) and rather lower elongation (15.0%~17.0% ). Comprehensive consideration, the mechanical properties of steel strip with slow-cooling process are better than that with air-cooling process.

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