二次冷轧压下率对镀锡板组织性能的影响

 为了开发高硬度二次冷轧镀锡板,采用硬度计、拉伸试验机、光学显微镜和X射线衍射仪研究了二次冷轧压下率对氮强化镀锡板组织性能的影响规律。结果表明,随着二次冷轧压下率提高,试验钢的硬度和强度提高,各向异性增加,伸长率降低,当二次冷轧压下率为44%时可达到DR-9M的技术要求。同时采用高碳和氮强化成分体系配合低温退火不利于有利织构{111}的形成,织构取向密度的峰值出现在{001}<110>~{114}<110>、{223}<110>~{445}<110>和{554}<225>,冲压成形时易在45°方向上产生制耳。

Effect of secondary cold rolling reduction rate on microstructure and properties of tinplate

In order to develop high-hardness secondary cold-rolled tinplate, effects of the secondary cold rolling reduction on the microstructure and properties of the tinplate were studied by the hardness tester,tensile tester,optical microscope and X-ray diffractometer. The results showed that as the secondary cold rolling reduction rate increasing,the hardness and strength of the test steel increased,the anisotropy increases,and the elongation decreased. When the secondary cold rolling reduction rate was 44%,the DR-9M can be achieved. At the same time, the use of high carbon and nitrogen fortification system combined with low temperature annealing is not conducive to the formation of favorable texture {111}. The peak of texture orientation density appears in {001}<110>~{114}<110>,{223}<110 >~{445}<110> and {554}<225>,it is easy to produce ears in the 45° direction during stamping deformation.