热轧高强钢表面氧化铁皮的控制与改善

在热成型过程中，由于氧化铁皮抛丸清除不净，导致在加热后表面覆盖一层黑色氧化铁皮，影响加热温度的测量和精确控制。利用箱式加热炉、场发射电子显微镜和电子背散射衍射仪等设备，分析了460 MPa汽车桥壳用钢在两种不同热轧工艺条件下的氧化铁皮厚度、结构的变化规律。研究表明：工艺二(低温短时烧钢，高温终轧、卷取工艺)条件下的氧化铁皮结构更易抛丸去除，经抛丸、加热模拟试验后，表面无氧化铁皮覆盖物，满足测温要求。

Control and improvement of oxide scale on the surface of hot rolled high strength steel

In the hot forming process, the iron oxide scale was not fully removed by shot blasting, resulting in a layer of black iron oxide scale on the surface after heating, which then affected the measurement and precise control of the heating temperature. The box heating furnace, field emission electron microscope and electron backscatter diffractometer were used to analyze the change rule of oxide scale thickness and structure of 460 MPa automobile axle housing steel under two different hot rolling process conditions. The studies showed that the oxide scale structure under the condition of Process II (short time steel burning at low temperature, high temperature final rolling, coiling process) was easier to be removed by shot blasting. After shot blasting and heating simulation experiments, there was no oxide scale covering on the surface, which could meet the requirements of temperature measurement.