锰含量和终轧温度对低成本中钛Q345B钢组织性能的影响  

Effects of Manganese Content and Finishing Rolling Temperature on the Microstructure and Mechanical Properties of Low Cost Middle Titanium Q345B Steel

作　　者：杨财水 罗许[1,2] 李俊洪[2] 康永林[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]攀钢集团研究院有限公司,四川攀枝花617000

出　　处：《钢铁》2014年第11期59-63,共5页Iron and Steel

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA031601);"十二五"国家科技支撑计划资助项目(2012BAF04B01)

摘　　要：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.

关 键 词：锰含量 终轧温度 微观组织 力学性能 析出 

分 类 号：TG335[金属学及工艺—金属压力加工] TG142.1[一般工业技术—材料科学与工程]