通过实验室轧制试验，研究不同锰质量分数（0.6%～1.0%）、终轧温度对低成本中钛（质量分数0.04%～0.05%）Q345B钢微观组织和力学性能的影响，同时采用透射电镜观察钢中钛的析出规律。结果表明：锰质量分数为0.8%、终轧温度为850℃时，试验钢的屈服强度为491 MPa，抗拉强度为625 MPa，伸长率为33.6%，在满足力学性能条件下能最大限度地降低成本，而钛的析出主要以球形纳米尺寸TiC粒子为主，有少量方形大尺寸TiN粒子。
Influences of different manganese content (0.6%-1.0%) and finishing rolling temperature on the microstructure and mechanical properties of low cost middle titanium (0.04%-0.05%) Q345B Steels were studied by laboratory rolling ex-periments, combining TEM observing the rule of Ti precipitation in the steel. The results indicate that when the manganese content was 0.8%and the finish rolling temperature was 850℃, the yield strength of the experimental steel was 491 MPa, the tensile strength was 625 MPa and the elongation was 33.6%. It can reduce the cost to maximum under the condition of meeting mechanical properties. The precipitation of Ti is mainly spherical nanometer size TiC particles, with a small amount of square large TiN particles.
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