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 ›› 2012, Vol. 33 ›› Issue (3): 57-60.

• 组织和性能 • 上一篇    下一篇

终轧温度和冷却速度对Q550D钢组织和力学性能的影响

高兵,赵亚娟   

  1. 南京钢铁联合有限公司技术质量部,南京210035
  • 收稿日期:2011-11-07 出版日期:2012-06-01 发布日期:2022-10-14
  • 作者简介:高兵( 1969-),男,1995年江苏冶金职工大学毕业,理化室主任,物理检验与分析。

Effect of Finishing Temperature and Cooling Rate on Structure and Mechanical Properties of Steel Q550D

Gao Bing , Zhao Yajuan   

  1. Quality and Technology Department, Nanjing Iron and Steel United Co Ltd, Nanjing 210035
  • Received:2011-11-07 Published:2012-06-01 Online:2022-10-14

摘要: 通过Gleeble-3800热模拟试验机,研究了终轧温度(800~950℃)和冷却速度(2~20℃/s)对Q550D微合金钢板(/%:0.06C、0.20Si、1.60Mn、0.010P、0 001S、0.10Mo、0.06Nb、0.01V、0.02Ti)的组织和力学性能的影响。结果表明,随着终轧温度的降低和轧后冷却速度的增加,粒状贝氏体逐渐减少,板条贝氏体逐渐增多,钢的屈服和抗拉强度提高的趋势比较明显,-20℃韧性得到改善,但伸长率呈下降趋势;在终轧温度为850℃、冷却速度为15~20℃/s时,Q550D钢具有较好的综合强韧性,即抗拉强度约为750 MPa,屈服强度650 MPa,伸长率39%,-20℃冲击功65 J。

关键词: Q550D微合金钢, 热模拟, 终轧温度, 冷却速度, 组织, 力学性能

Abstract: The effect of finishing temperature (800 ~850 °C ) and cooling rate (2 〜20 ℃/s) on structure and mechanical properties of microalloying steel Q55OD plate (/% : 0. 06C, 0. 20Si, I. 60Mn, 0. 010P, 0. 001S, 0. 10Mo, 0. 06Nb, 0. 01V, 0. 02Ti) has been studied by using thermo-mechanical simulator Gleeble-3800. Results show that with decreasing finishing temperature and increasing cooling rate after rolling, the granular bainite in steel gradually decreases, and the lath bainite gradually increases, as a results the yield and tensile strength of steel increasing trend is obvious and the - 20 ℃ toughness is improved but the elongation of steel is decreasing trend ; with finishing temperature 850 °C and cooling rate 15 - 20 ℃/s the steel Q550D has better strength-toughness comprehensive properties, i. e. tensile strength is about 750 MPa, yield strength 650 MPa, elongation 39% and -20 ℃ impact energy 65 J.

Key words: Microalloying Steel Q55OD, Thermal Simulation, Finishing Temperature, Cooling Rate, Structure, Mechanical Properties