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讨论了C-Mn-Si低合金钢控轧控冷生产HRB400的工艺流程、化学成分、力学性能、金相组织与强化机制,提出了合理的C、Mn控制目标。同时对实验中出现的问题进行了分析,提出了解决问题的措施。实验结果表明:C-Mn-Si低合金钢控轧控冷生产HRB400金相组织为F+P,钢筋心部和边缘的晶粒度为8.5级和9.5级,比热轧钢筋分别提高1.0～2.0级,力学性能符合HRB400的要求。
The technological process, chemical composition, mechanical properties, microstructure and strengthening mechanism of HRB400 controlled by C-Mn-Si low alloy steel are discussed. The reasonable C and Mn control objectives are proposed. At the same time, the problems appearing in the experiment are analyzed, and the solutions to the problems are put forward. The experimental results show that the microstructure of HRB400 produced by controlled rolling and controlled cooling of C-Mn-Si low alloy steel is F + P, the grain size of core and edge of steel rebar is 8.5 and 9.5, respectively, 2.0, mechanical properties in line with the requirements of HRB400.