Abstract: The production process of Φ30 mm tested cold-heading steel SWRCH22A (/%：0.18C, 0.04Si, 0.87Mn, 0.013P, 0.010S, 0.039Al) is 100 t BOF- LF-150 mm x 150 mm billet casting-rolling. The test of double passes reduction of steel SWRCH22A with strain rate 1  s^-1, deformation 0.25 and time interval 0.5~15 s at 900 °C and 1000 °C has been carried out by using Gleeble-3500 thermal  simulator to get stress-strain curves of steel. The effect of deformation temperature and time interval on static recrystallization behavior of cold-heading steel SWRCH22A is analyzed and the static recrystallization percentage in steel with different deformation conditions is calculated by using stress compensation method. According to the experimental data, the calculated static recrystallization activation energy Q_rex of steel SWRCH22A is 249 287 J/mol. And the static recrystallization kinetic model is obtained by reference of semi-empirical formulas. The model calculated values are in agreement with the test results.

Key words: Cold-Heading Steel SWRCH22A, Double Passes Reduction, Static Recrystallization, Kinetic Model

摘要： Φ30 mm试验冷镦钢SWRCH22A（/%:0.18C,0.04Si,0.87Mn,0.013P,0.010S,0.039Al）的生产工艺为100 t BOF-LF-150mm×150 mm坯连铸-轧制。用Gleeble-3500热模拟试验机,在900℃和1000℃对SWRCH22A钢以变形速率1 s^-1、变形量0.25,时间间隔0.5~15 s进行双道次压缩变形试验,得出应力-应变曲线。分析了变形温度和间隔时间对冷镦钢SWRCH22A静态再结晶行为的影响,采用应力补偿法计算了不同变形条件下的静态再结晶百分数。根据试验数据,计算出SWRCH22A钢的静态再结晶激活能为Q_rex=249 287 J/mol。参考半经验公式,得到了静态再结晶动力学模型。模型计算与试验结果吻合。

关键词: 冷镦钢SWRCH22A, 双道次压缩, 静态再结晶, 动力学模型