高强度建筑钢屈强比的研究

Study on Tensile Ratio of High Strength Construction Steel

通过分析生产实际的数据和应用金相、扫描电子显微镜观察,对热轧态高层建筑钢板的屈强比的影响因素进行了分析,结果表明:随着钢板厚度的增加,屈服强度下降,抗拉强度有少许的上升,屈强比有明显的下降;随着C含量的增加,抗拉强度比屈服强度的上升快,钢板的屈强比减小,随着Mn、Si含量的增加,屈服强度、抗拉强度和屈强比增加;随着开轧温度、开冷温度的提高,屈服强度和屈强比均有明显的下降,而抗拉强度下降的幅度小;晶粒细化对屈服强度的提高比对抗拉强度的明显,并能显著的提高屈强比。

The influencing factors of the tensile ratio of hot-rolled steel plate for high-rise buildings were studied by analyzing practical production data and by metallographic microscope and a scanning electron microscope. The results show that along with an increas- ing thickness of steel plate, the yield strength decreases, the tensile strength rises slightly, and the tensile ratio remarkably declines; the ten- sile strength rises faster than the yield strength with an increase of carbon content, the tensile ratio reduces; the yield strength, tensile strength and tensile ratio rise with the increasing of Manganese and Silicon content ; As the roiling temperature and initial cooling temperature raise, the yield strength and tensile ratio drop obviously, while the tensile strength has a small fall. In addition, the increase of the yield strength is more obvious than that of the tensile strength because of the grain refining, and the tensile ratio can be also significantly improved.