冷轧板冲压橘皮缺陷分析

Analysis of Orange Peel Defects in Cold Rolled Sheet

由于St13冷轧板冲压后表面出现橘皮缺陷,严重影响使用性能,对钢板生产工艺过程参数和缺陷板取样进行分析,结果表明,化学成分符合要求,退火工艺参数正常,但缺陷试样组织存在一定混晶现象,试样拉伸试验存在微小屈服平台,说明热轧工艺波动和冷轧平整力不足是导致橘皮缺陷产生的主要原因,通过加强热轧工艺控制,优化平整工艺参数,消除了屈服平台和冲压橘皮缺陷。

Because orange peel defects appeared in the surface of Stl3 cold-rolled sheet after deep punching, seriously affecting the use performance, the process parameters and the samples from the sheet with defects were analyzed. The results showed that the chemical composition met the requirement and the annealing parameters were regular, but mixed grain phenomenon in the microstructure of the sample and a smell yield point jog existed in the tension test of the simple. The fluctuation of hot rolling process and small rolling force in leveling process are main reasons caused the orange peel defects. Through strengthening process control in hot rolling and optimizing leveling parameter, the yield point jog and orange peel defect were eliminated.