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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 thickness evolution of HY490 steel in the finish rolling process was numerically simulated. The results of numerical simulation were verified by hot rolling test, and the structure of hot rolled test scale was tested. The cold bending test was used to determine the adhesion of the scale on the strip surface under the two process conditions. The results show that the numerical simulation results are consistent with the field measurements. The simulation method solves the problem that the thickness of the scale can not be directly measured during the finish rolling, which provides a reference for controlling the thickness of the scale by adjusting the production process parameters. Hot rolling tests show that the appropriate control of the rolling temperature, the finishing temperature, the coiling temperature and the shortening of the rolling pass interval are effective measures to control the thickness and structure of scale. Cold-bend test shows that the adhesion of the scale and the steel sheet is poor under the condition of Process 1, and the bent sheet metal is in the form of fine flakes. Under the condition of process 2, the combination of the steel sheet and the metal sheet is firm, the metal surface on the curved surface is in the form of fine powder, and the adhesion is good.