对不同合金成分20MnSi钢进行控轧控冷和不同温度自回火处理后，分别采用光学显微镜和多功能材料试验机研究了不同自回火温度下不同硅、锰含量20MnSi钢筋的显微组织及力学性能。试验结果表明：随着自回火温度的升高，钢筋的表层显微组织逐渐得到改善，并最终得到珠光体组织，使20MnSi钢筋的强度与韧性得到良好配合； 20MnSi钢筋的淬透性随钢筋中Si、Mn元素含量的提高而提高，从而显著增强钢筋的力学性能。采用控轧控冷工艺，在标准范围内适当提高硅、锰含量，并在轧后进行高温自回火，可在不额外加入Nb、V等微合金元素的基础上进行HRB400钢筋的生产。
The microstructure and mechanical properties of 20MnSi steel with different Si, Mn content and selftempering temperature were analyzed. The results indicate that the outside structure of 20MnSi steel is refined as selftempering temperature increases, which make the strength and ductility of 20MnSi steel wellmatched; the quenching degree of 20MnSi steel increases as the content of Si and Mn rises, which enhances the mechanical properties of 20MnSi steel dramatically. In such a way, it might be expected to manufacture HRB400 barl through TMCP, proper Si, Mn content and high selftempering temperature without adding micro alloying elements such as Nb and V.
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