以工业生产的、采用层流冷却和超快速冷却的含钛IF热轧板为试验材料, 在实验室研究了热轧冷却方式和冷轧压下率对退火后试验钢组织和力学性能影响。结果表明: 当冷轧压下率为65%和75%时, 与层流冷却相比, 超快速冷却试验钢的Rp0.2约低10 MPa左右, n值高0.02, r值稍高; 当冷轧压率在55%~85%时, 试验钢的Rp0.2为100～120 MPa; 最佳工艺为热轧后采用超快速冷却, PY400温度约为780 ℃、冷轧压下率为65%～75%、退火温度为730 ℃; 在此最佳工艺下, 试验钢具有较低的屈服强度和优良的冲压成型性能。

Taking industrial Ti-IF steel sheets prepared under laminar cooling and ultra-fast cooling conditions as tested materials, and the effects of cooling methods after hot-rolling and cold rolling reduction ratio on microstructure and mechanical properties were studied. The results show that when the cold rolling reduction ratio was 65% and 75%, comparing with the laminar cooling, the Rp0.2of the steel under ultra-fast cooling was overall low around 10 MPa, the n value was high 0.02 and the r value slightly higher. When the cold reduction ratio was 55%-85%, the Rp0.2 was 100-120 MPa. The optimal processes were ultra-fast cooling after hot rolling, PY400 temperature of 780 ℃, cold reduction ratio of 65%-75% and the annealing temperature of 730 ℃. At the optimum processes, the tested steel had a lower yield strength and good stamping performance.