高强度热镀锌结构钢SGC570的退火工艺

针对高强度热镀锌结构钢SGC570产品的技术要求,选择C-Mn化学成分体系、热连轧+冷轧+连续退火热镀锌的工艺路线对其连续退火工艺进行了研究。实验室通过热模拟退火试验、拉伸试验、硬度试验和显微组织观察等手段,得出高强度热镀锌结构钢SGC570产品的再结晶温度为550 ℃,为了提升屈服强度,选择在530~540 ℃之间进行不完全再结晶退火;在工业化小批量试制阶段,通过分析退火温度与产品组织性能的关系对连续退火工艺进行了研究,总结出工业化生产最佳退火温度为530 ℃。

Annealing process of high-strength hot-dip galvanized structural steel SGC570

In accordance with the technical requirements of high-strength hot-dip galvanized structural steel SGC570, a process route of C-Mn chemical composition system, hot continuous rolling+cold rolling+continuous annealing hot-dip galvanizing was selected to study its continuous annealing process. Through thermal simulated annealing experiment, tensile test, hardness test, microstructure observation, it is found that the recrystallization temperature of high-strength hot-dip galvanized structural steel SGC570 product is 550 ℃. In order to improve the yield strength, incomplete annealing process is performed between 530-540 ℃. In the industrial small batch trial production stage, the continuous annealing process is studied by analyzing the relationship between annealing temperature and product microstructure and properties, and it is concluded that the best annealing temperature for industrial production is 530 ℃.