谢保盛,蔡庆伍,余伟,刘涛,李晓林

• 1:北京科技大学高效轧制国家工程研究中心

摘要(Abstract)：

利用Q345D连铸坯料(0.16C,0.26Si,1.40Mn,Nb+Ti<0.040)制备Q420E钢,采用不同冷却速率和终冷温度的快冷工艺进行了厚30 mmQ420E钢高强度板试验,研究了冷却速率和终冷温度对其强度及韧性的影响。结果表明,随着冷却速率的增大和终冷温度的降低,铁素体晶粒尺寸减小,钢板强度和韧性提高,伸长率下降;当终冷温度控制在480~520℃之间,冷却速度控制在8~15℃/s之间时,组织为铁素体+珠光体+贝氏体组织,心部铁素体晶粒尺寸为7.2μm,钢板综合性能达到国标Q420E级别的要求,成功实现采用Q345D轧制30 mm厚的Q420E钢板的低成本生产,并为更高级别钢种的性能提升提供了依据,但轧制过程中部分钢板出现了心部偏析,以及快冷工艺对于钢板焊接性能的影响,仍然需要做进一步研究。

关键词(KeyWords)： Q345D;快速冷却;冷却速率;终冷温度;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 谢保盛,蔡庆伍,余伟,刘涛,李晓林

DOI: 10.13289/j.issn.1009-6264.2014.03.018

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