中文摘要：

为探索满足高强PC钢棒对强度、屈强比和延伸性等力学性能指标的要求，系统研究了合金元素碳、硅、钒等含量对高强Pc钢棒热处理后力学性能的影响。结果表明，当碳含量达到0．17％时，淬火后抗拉强度开始显著提高；硅元素含量的提高有利于提高钢棒的延性，但屈强比也随之提高；钒元素的存在会有利于强度和塑性的整体提高，但也使钢棒屈强比提高。

英文摘要：

In order to fulfill the requirements of strength, yield ratio and extension of high strength PC steel bar, effects of alloy elements content such as carbon, silicon, vanadium on mechanical properties of PC steel bar after heat treatment were studied. The results show that when the carbon content reaches 0.17%, the tensile strength begins to significantly improve after quenching. Increase of the silicon content is beneficial for improving the ductility of steel bar. However, the yield ratio would be increased. The yield ratio should be increased with existence of vanadium, but it is beneficial for improving the overall strength and plasticity of the steel bar.