退火工艺对冷轧低碳热镀锌钢板组织均匀性的影响

通过模拟退火试验及工业试制,研究了退火工艺对冷轧低碳热镀锌钢板组织均匀性的影响,探讨了钢板出现混晶组织的原因,并制定了解决方案。结果表明:加热速率偏低是造成混晶组织的主要原因,随着加热速率的升高,组织细化且均匀性改善;在较低加热速率下,延长均热时间和提高退火温度在一定程度上加剧了组织的不均匀性。针对镀锌机组降速生产引起混晶的问题,结合模拟退火试验结果,降低退火温度可以改善降速导致的混晶问题,制定了降速生产的退火工艺并应用于实际生产。

Effect of annealing process on microstructure uniformity of cold-rolled low-carbon steel plate for hot dip galvanizing

Effect of annealing process on the microstructure uniformity of cold-rolled low-carbon steel plate for hot dip galvanizing was studied by simulated annealing experiment and industrial trial production. The causes of mixed grain microstructure in the steel were analyzed and the solution was developed. The results show that lower heating rate is the main reason for the mixed grain microstructure. With the increase of heating rate, the microstructure becomes finer and more uniform. At lower heating rate, both extending the soaking time and raise the annealing temperature aggravate the inhomogeneity of microstructure. Aiming at the problem of the mixed grain resulted from the rate decline during the galvanizing unit production and combined with the simulated annealing test results, it is found that lowering the annealing temperature can improve such mixed grain problem, and based on which the annealing process for the rate reducing production is formulated and applied to the actual production.