金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 230-233.DOI: 10.13251/j.issn.0254-6051.2022.05.040

• 工艺研究 • 上一篇    下一篇

终冷温度对Q345R钢组织及性能的影响

张德勇1,2, 冯仰峰1, 李维娟2, 李伟1, 许继勇1, 祁敏翔1   

  1. 1.日钢营口中板有限公司 辽宁省中厚板专业技术创新中心, 辽宁 营口 115000;
    2.辽宁科技大学 材料与冶金学院, 辽宁 鞍山 114000
  • 收稿日期:2021-12-16 修回日期:2022-03-04 出版日期:2022-05-25 发布日期:2022-06-16
  • 作者简介:张德勇(1989—),男,工程师,硕士,主要研究方向为中厚板产品开发及科研管理,E-mail: 457952249@qq.com

Effect of final cooling temperature on microstructure and properties of Q345R steel

Zhang Deyong1,2, Feng Yangfeng1, Li Weijuan2, Li Wei1, Xu Jiyong1, Qi Minxiang1   

  1. 1. Liaoning Province Medium and Heavy Plate Professional Technology Innovation Center, Rigang Yingkou Medium Plate Co., Ltd., Yingkou Liaoning 115000, China;
    2. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114000, China
  • Received:2021-12-16 Revised:2022-03-04 Online:2022-05-25 Published:2022-06-16

摘要: 对压力容器用钢Q345R开展终冷试验,研究终冷温度对轧态及正火态钢板力学性能与显微组织的影响。结果表明,在不同终冷温度下,轧态及正火态Q345R钢的力学性能均满足标准要求,但轧后直接空冷时,性能余量较小,在终冷温度为650 ℃时,力学性能较好;随着终冷温度的升高,钢板的屈服强度、抗拉强度、冲击性能均有下降的趋势,组织逐渐变粗大;轧态及正火态试样的微观组织均为典型的铁素体+珠光体,与热轧态钢板相比,正火态钢板的屈服强度和抗拉强度均明显降低,但冲击性能显著提高,且正火后组织有所细化。

关键词: 终冷温度, Q345R钢, 热处理, 力学性能, 显微组织

Abstract: Final cooling test was carried out on the pressure vessel steel Q345R, and the effect of final cooling temperature on mechanical properties and microstructure of the as-rolled and normalized steel plate was studied. The results show that the mechanical properties of the as-rolled and normalized Q345R steel at different final cooling temperatures meet the standard requirements, but when directy air cooled after rolling, the performance margin is small. When the final cooling temperature is 650 ℃, the mechanical properties are relatively better. With the increase of final cooling temperature, the yield strength, tensile strength, and impact property of the steel plate have a downward trend, and the microstructure gradually becomes coarser. The microstructure of the as-rolled and normalized specimens are all typical ferrite+pearlite, and after normalization of the steel plate, the yield strength and tensile strength are significantly lower than that of the hot-rolled steel plate, while the impact property is significantly improved, and the microstructure becomes finer.

Key words: final cooling temperature, Q345R steel, heat treatment, mechanical properties, microstructure

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