武钢CSP生产的含Ti集装箱钢SPA-H的性能优化研究

通过光学显微镜、透射电镜、力学性能测试以及生产数据统计分析等手段分析了CSP工艺生产加Ti集装箱钢SPA-H时,成分及工艺对钢的显微组织及力学性能的影响。研究结果表明,钢中w（Ti）为0.02%～0.04%时,成品带钢晶粒尺寸可细化约1μm,且可观察到大量细小弥散的第二相析出物,可提高抗拉强度约30MPa左右;C、Ti的增加可提高钢的抗拉强度,且Ti的作用更加明显;S、N的存在会降低钢的抗拉强度,且N的作用更加明显;均热温度和终轧温度的适当提高,可提高钢的抗拉强度,而卷取温度对钢强度的影响则不明显。

Manufacturing technology of SPA-H steel microalloyed with Ti by CSP process in WISCO

Optical microscope,transmission electronic microscopy,mechanical tester and statistical analysis were employed to analyze the effect of composition and processing of Ti microalloyed SPA-H steel by CSP process on its microstructure and mechanical properties.The results showed that Ti addition about 0.02 %～0.04 % can make the crystal size of container sheet be refined about 1 μm,and a mass of secondary phase precipitation can be observed,the tensile strength can be increased about 30 MPa;With the increase of carbon content and titanium content,the tensile strength of the steel increases,and titanium plays a significant role;With the increase of sulfur content and nitrogen content,the tensile strength of the steel decreases,and nitrogen plays a significant role;The tensile strength of the steel was also improved with the increase of reheating temperature and finish roiling temperature,while coiling temperature had little effect.