高强度镀锌用冷轧薄板再结晶温度及性能研究

Study on Recrystallization Temperature and Properties of Cold Rolled Sheet for High Strength Galvanizing

在连续退火模拟试验机上对低碳冷轧钢板进行退火,研究在不同化学成分、不同退火温度和退火时间下显微组织的演化过程,并分析了退火工艺对钢板硬度和拉伸性能的影响。结果表明,随着C、Mn含量的增加,溶质原子拖曳和第二相析出阻碍了晶粒长大,钢板的再结晶温度升高;增加退火时间,再结晶速度降低,再结晶温度略有下降。根据试验结果进行工业试制,高强度镀锌钢卷力学性能达到标准要求。

The low carbon cold rolled steel plates were annealed on a continuous annealing simulator. The microstructure evolution under different chemical composition, annealing temperature and annealing time was studied. The effects of annealing process on the hardness and tensile properties of the steel plate were analyzed. The results show that, with the increase of C, Mn content, the solute atom drag and second phase precipitation hinder grain growth, and the recrystallization temperature of steel plate increases. With the increase of annealing time, the recrystallization rate decreases and the recrystallization temperature decreases slightly. According to the test results, the mechanical properties of high strength galvanized steel coils meet the standard requirements.