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为降低Q345C钢中的Mn含量,拟通过加大控冷过程中的水量,实现晶粒的细化来提高钢的强度。为此,计算了不同化学成分Q345C钢的CCT曲线,为制定冷却工艺提供参考;并用经验公式对钢的强度进行了估算。同时对试验钢(Mn质量分数从1.4%降至1.2%)进行了控轧控冷试验,终冷温度从630℃降至580℃,并对其组织性能进行了分析。结果表明:试验钢组织为铁素体+珠光体+少量贝氏体,强度满足标准要求。
In order to reduce the content of Mn in Q345C steel, it is proposed to increase the strength of the steel by increasing the amount of water in the process of cooling and controlling the grain refinement. Therefore, the CCT curves of Q345C steel with different chemical compositions were calculated, which provided a reference for the development of cooling technology. The strength of steel was estimated by empirical formula. At the same time, the controlled rolling and controlled cooling tests were carried out on the test steel (Mn content decreased from 1.4% to 1.2%). The final cooling temperature was decreased from 630 ℃ to 580 ℃. The microstructure and properties were also analyzed. The results show that the microstructure of the test steel is ferrite + pearlite + a small amount of bainite, and the strength meets the standard requirements.