通过实验室热轧试验研究了控轧控冷工艺参数(开轧温度、终轧温度、卷取温度以及卷取后冷却速率)对冶金锯片用65Mn热轧带钢组织、硬度和抗拉强度的影响, 并得到了最佳的控轧控冷工艺参数。结果表明: 在较高的开轧温度和终轧温度、较高的卷取温度和较低的卷取后冷却速率下, 65Mn钢的原始奥氏体晶粒尺寸和珠光体片层间距均较大, 抗拉强度和硬度较低, 其中卷取后冷却速率对组织和力学性能的影响最为显著; 最佳的控轧控冷工艺参数为开轧温度(1 180±10) ℃、终轧温度(910±10) ℃、卷取温度(710±10) ℃、卷取后平均冷速小于0.05 ℃·min-1。

The effects of controlled rolling and controlled cooling technological parameters(start rolling temperature, finish rolling temperature, coiling temperature and cooling rate after coiling) on microstructure and mechanical properties of 65Mn hot rolled strip were studied, and the best controlled rolling and controlled cooling technological parameters were obtained. The results show that, under the conditions of higher start rolling temperature, higher finish rolling temperature, higher coiling temperature and lower cooling rate after coiling, the original austenite grain size and pearlite interlamellar spacing of 65Mn steel were larger, and the tensile strength and hardness were lower. The cooling rate after cooling had the most obvious effects on microstructure and mechanical properties. The best controlled rolling and controlled cooling technological parameters as follows, start rolling temperature was (1 180±10) ℃, finish rolling temperature was (910±10) ℃, coiling temperature was (710±10) ℃ and cooling rate after coiling was less then 0.05 ℃·min-1.