在Q345B钢的基础上,将锰的质量分数降至0．8％,并添加质量分数为0．05％的钛设计了钛微合金化 Q345B钢；将该钢分别在820,850,880℃下进行终轧,研究了终轧温度对其显微组织和力学性能的影响.结果表明：随着终轧温度升高,试验钢的屈服强度和伸长率均表现为先升高后降低的趋势,在850℃达到最大,分别为490 MPa和34．0％；抗拉强度则随终轧温度升高而逐渐降低,这主要是由铁素体晶粒尺寸随终轧温度升高而不断长大导致的；当终轧温度为850℃时试验钢可获得最佳的综合力学性能.
Q345B Ti-microalloyed steel containing 0.8wt% Mn and 0.05wt% Ti were designed on the base of Q345B steel,and then the steel was final-rolled at 820,850,880 ℃,and the effects of final-rolling temperature on microstructure and mechanical properties were studied.The results show that yield strength and elongation of the tested steel increased first and then decreased with the increase of final rolling temperature, when the final temperature was 850 ℃,yield strength and elongation up to the maximum,and they were 490 MPa and 34.0%, respectively.However,tensile strength gradually decreased with the increase of final rolling temperature,this due to the growing ferrite grains.The optimal mechanical properties were obtained for the tested steel at final rolling temperature of 850 ℃.
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