镀锌/连退两用机组的退火周期与常规的连续退火机组明显不同,不仅退火周期较短、一次冷却速度低,而且无缓冷段.根据其工艺特点,以工业生产的热轧高温卷取低碳钢轧硬卷为试验材料,研究了退火温度和时间以及过时效对低碳钢和微碳钢组织和性能的影响.试验结果表明,不管是低碳钢还是微碳试验钢,退火后晶粒尺寸均较细,即使退火温度达到810℃,铁素体晶粒度仍在10.5级左右;经400℃×240 s过时效处理后,低碳钢的强度有所降低(10 MPa左右),延伸率有所提高,最高增加值为4.5％,微碳钢只有当退火温度达到810℃时,强度才有所降低(10MPa左右),即过时效的作用不明显.通过采用微硼处理,优化连退和在线平整工艺,在热镀锌/连退两用机组上生产出了力学性能优良的产品.
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