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 (2): 54-56.

• 组织和性能 • 上一篇    下一篇

V-Nb微合金化热轧带肋高强度钢筋HRB600的连续冷却转变曲线

徐志东,范植金,徐志,刘文艳   

  1. 武汉钢铁(集团)研究院,武汉 430080
  • 收稿日期:2013-09-22 出版日期:2014-04-01 发布日期:2022-09-14
  • 作者简介:徐志东(1985-),男,助理工程师,硕士研究生(武汉科技大学),2009年武汉科技大学(本科)毕业,棒材品种开发。

Continuous Cooling Transformation Curves of V-Nb Microalloying High Strength Steel HRB600 Hot-Rolling Reinforcing Bars

Xu Zhidong , Fan Zhijin , Xu Zhi , Liu Wenyan   

  1. Research and Development Institute, Wuhan Iron and Steel (Group) Co Ltd, Wuhan 430080
  • Received:2013-09-22 Published:2014-04-01 Online:2022-09-14

摘要: 试验用600 MPa级高强度钢(/%:0.23C,0.67Si,1.35Mn,0.028P,0.023S,0.131V,0.033Nb),由25kg真空感应炉冶炼,并热轧成16 mm×180 mm扁材。利用膨胀法结合金相分析及硬度在Thermecmastor-Z热模拟试验机上测定了HRB600钢在冷却速率0.1~100℃/s下的连续冷却转变膨胀曲线,获得了该钢的连续冷却转变曲线(CCT曲线)并研究了该钢转变后的组织。结果表明,850℃奥氏体时,冷却速率小于3℃/s时试验V-Nb微合金化高强度钢HRB600的组织为先共析铁素体+珠光体,当冷却速率为5℃/s时,出现少量马氏体,影响钢筋的焊接性能,当冷却速率达100℃/s时可获得马氏体组织。

关键词: V-Nb微合金化, HRB600热轧带肋高强度钢筋, 连续冷却转变(CCT)曲线, 组织

Abstract: The test 600 MPa grade high strength steel (/% : 0.23C, 0.67Si, 1.35Mn, 0.028P, 0.023S, 0.131V, 0.033Nb) is melted by a 25 kg vacuum induction furnace and hot-rolled to 16 mm x 180 mm slab product. With dilatometric test combined with structure metalloscopy and microhardness test the continuous cooling transformation expansion curves of steel HRB600 at cooling rate 0.1-100 ℃/s have been measured by hot simulation testing machine Thermecmastor-Z to got the continuous cooling transformation (CCT) curves of the steel and the transformed structure of steel is studied. Results show that with austenizing at 850 ℃,as cooling rate less than 3 °C/s the structure of tested V-Nb microalloying high strength steel HRB600 is proeutecloid ferrite + pearlite; with cooling rate 5 ℃/s the minor martensite occurs in structure to effect the welding behavior of steel ; and with cooling rate up to 100 ℃/s the martensite structure is obtained in steel.

Key words: V-Nb Microalloying, HRB600 Hot-Rolled High Strength Reinforcing Bar, Continuous Cooling Transformation ( CCT) Curves, Structure