热轧高强钢氧化铁皮演变规律的研究

Study on Evolution Law of Oxide Scale of Hot-Rolled High Strength Steel

对HY490钢在精轧工艺下氧化铁皮的厚度演变进行了数值模拟。通过热轧试验验证了数值模拟结果,并对热轧试验氧化铁皮的结构进行了检测。采用冷弯试验测定了2种工艺条件下带钢表面氧化铁皮的粘附性。结果表明:数值模拟结果与现场实测值相符。此模拟方法解决了精轧过程中无法直接测量3次氧化铁皮厚度的问题,为通过调整生产工艺参数来控制氧化铁皮厚度提供了参考。热轧试验表明适当地降低开轧温度、终轧温度、卷取温度和缩短轧制道次间隔时间是控制氧化铁皮厚度和结构的有效手段。冷弯试验表明工艺1条件下氧化铁皮与钢板的粘附性较差,弯曲面铁皮呈细片状脱落。工艺2条件下铁皮与钢板结合牢固,弯曲面铁皮呈细粉末状,粘附性好。

The numerical simulation of oxide scale formation was carried out for hot rolled HY490 in the finishing rolling process. The numerical simulation results of oxide scale were verified by hot rolling trials, and the structure of oxide scale was also examined. The spallation resistance of oxide scale has been assessed by cold bending trial. The results show that the numerical simulation results were in good agreement with the measured values, indicating that the simulation method is useful for adjusting rolling parameters to control scale formation during the finishing rolling process. The results of hot rolling trials show that decreasing rolling temperature, coiling temperature and shortening the pass interval during finish rolling are effective in controlling the structure and thickness of oxide scale. The results of cold bending trial show that the adhesion between oxide scale and substrate is poor in process- ing one, with oxide flakes having been spalled off in the bended areas. While the adhesion is good in processing two, with only small amount of oxide powdery having been spalled off during bending.