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 ›› 2009, Vol. 30 ›› Issue (5): 63-64.

• 组织和性能 • 上一篇    下一篇

Cr对0.035C-0.12Nb X80管线钢相变和组织的影响

牛延龙1,2,孙新军2,刘清友2, 孙力军1   

  1. 1. 昆明理工大学材料与冶金工程学院,昆明 650093;
    2. 钢铁研究总院结构材料研究所,北京 100081;
  • 收稿日期:2009-03-09 出版日期:2009-10-01 发布日期:2022-11-18
  • 作者简介:牛延龙(1982-),男,硕士,从事铌微合金钢研究。
  • 基金资助:
    国家科技支撑计划资助项目(No.2006BAE03A15)

Effect of Cr on Phase Transformation and Structure of 0.035C-0.12Nb X80 Pipeline Steel

Niu Yanlong1,2 , Sun Xinjun2 , Liu Qingyou2 , Sun Lijun1   

  1. 1. Faculty of Material Science and Metallurgy Engineering,Kunming University of Science and Technology,Kunming 650093;
    2. Institute for Structural Materials Central Iron and Steel Research Institute,Beijing 100081;
  • Received:2009-03-09 Published:2009-10-01 Online:2022-11-18

摘要: 通过Formastor-FⅡ热膨胀仪测定了50 kg真空感应炉冶炼的X80管线钢(%:0.034~0.036C、1.79~1.80Mn、0.26~0.62Cr、0.12Nb、0.01Ti、0.0037~0.0038N)铸坯在0.5~50℃/s冷却速率下奥氏体连续冷却的相变点,并观察其显微组织。结果表明,在同一冷却速率下,随钢中Cr含量增加,过冷奥氏体连续冷却贝氏体相变点降低,组织中更易生成板条状贝氏体,显微硬度明显提高。

关键词: X80管线钢, Cr, 贝氏体相变, 组织

Abstract: Transformation point of continuous cooling austenite at cooling rate 0.5~50 ℃/s in cast billet of X80 pipeline steel (%:0.034~0.036C,1.79~1.80Mn,0.26~0.62Cr,0.12Nb,0.01Ti,0.0037~0.0038N) melted by 50 kg vacuum induction furnace was determined by Formaster-F Ⅱ dilatometer,and structure of steel was observed. Results showed that at same cooling rate,with increasing Cr content in steel the overcooling austenite continuous cooling trans- formation point to bainite decreased,the lath bainite easily formed in structure,and the microhardness obviously increased.

Key words: X80 Pipeline Steel, Cr, Bainite Transformation, Structure