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 ›› 2014, Vol. 35 ›› Issue (3): 49-52.

• 组织和性能 • 上一篇    下一篇

Ti微合金化Q345D钢中厚板的组织和力学性能

周家林1,黄高1,向上1,潘成刚1,赖春明1,胡唐国2   

  1. 1武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081 ;
    2武汉钢铁股份有限公司,武汉430083
  • 收稿日期:2013-12-06 出版日期:2014-06-01 发布日期:2022-08-30
  • 作者简介:周家林(1966-),男,硕士,副教授,1988年武汉钢铁学院 (本科)毕业,材料成型过程中的数值模拟及新产品和新技 术开发研究。

Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel

Zhou Jialin1, Huang Gao1, Xiang Shang1, Pan Chenggang1, Lai Chumning1 ,Hu Tangguo2   

  1. 1 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081 ;
    2 Wuhan Iron and Steel Group Co Ltd, Wuhan 430083
  • Received:2013-12-06 Published:2014-06-01 Online:2022-08-30

摘要: 研究了铁水脱硫处理-150 t转炉-RH-保护浇铸-控轧控冷工艺生产的Ti微合金化Q345D钢(/%:0.15C,0.27Si,1.36Mn,0.019Ti,0.011P,0.003S,0.026Als)30 mm×2500 mm中板的力学性能、组织和析出物。结果表明,Ti微合金化Q345D钢的抗拉强度≥525 MPa,屈服强度≥390 MPa,延伸率≥29%, -40℃冲击功125 J;该钢组织为珠光体+铁素体+少量索氏体,晶粒度为12~14级;钢中夹杂物主要为MnS和Ti4C2S2,钢中析出物为50~250 nm弥散分布的TiN;钢的强度增加主要是TiN细晶强化作用引起的。

关键词: Q345D钢 , 中厚板, Ti微合金化, TiN析出物 , 细晶强化

Abstract: The mechanical properties, structure and precipitates of medium plate 30 mm X 2 500 mm of Ti micro alloyed Q345D steel (/%: 0. 15C, 0.27Si, 1. 36Mn, 0. 019Ti, 0. 011P, 0. 003S, 0. 026Als) produced by hot metal desulphurizing-150 t converter-RH-shielding casting-control rolling and cooling process have been studied. Results show that of Ti microalloying Q345D steel the tensile strength is m525 MPa, yield strength N390 MPa, elongation >29% and the -40 ℃. impact energy is 125 J; the structure of steel consists of pearlite, ferrite and minor sorbite with grain size grade 12~14; the main inclusions in steel are MnS and Ti4C2S2, the precipitates in steel are dispersive-distributed 50 ~250 nm TiN; and the increment of strength of steel is mainly caused by fine-grain strengthening of TiN.