摘要
捆带钢72AU2在实际生产中经常发生扁卷缺陷,导致下游无法顺利上卷生产。试验采用热膨胀法模拟捆带卷曲的相变过程对捆带钢72AU2的扁卷机理进行了探讨。结果表明:低温卷取时,卷取后钢卷相变温度较低发生贝氏体相变,相变膨胀量较大;钢卷降温冷缩作用无法抵消相变带来的体积膨胀,钢卷层间错动发生松卷,进而在自重作用下发生扁卷。在机理研究的基础上,通过提高卷取温度至650℃,延长卷筒处停留时间,控制钢卷在较高温度相变,形成铁素体加珠光体从而降低膨胀量,扩大钢卷外圈与环境温差从而增强降温冷缩效果,抑制了扁卷现象的发生。
The hot rolling coil oval deformation defect of steel strapping 72AU2 was frequently produced in the actual production, which influenced the normal production of downstream. The mechanism of the strapping steel 72AU2 coil oval deformation was discussed by thermal expansion simulation experiments for the phase transformation process of strapping steel coil oval deformation. The results show that bainitic transformation was induced because of the low phase transformation temperature after the low temperature coiling process, resulting in larger thermal expansion amount of the coil outer ring which could not be compensated by the air cooling effect in nature environment, causing the coil layers to become loosened and then coil oval deformation was produced under the effect of self-weigh. Basing on the mechanism research, several suggestions were given for inhibitsing coil oval deformation, such as improving coiling temperature to 650 ℃, extending the residence time on reel, controling coil phase transformation in the high temperature, formation of ferrite and pearlite to reduce expansion, expanding temperature difference of steel coil outer ring and environment to enhance cooling effect.
出处
《物理测试》
CAS
2014年第6期40-44,共5页
Physics Examination and Testing
关键词
捆带钢
扁卷
贝氏体
热膨胀
热轧
strapping steel
coil oval deformation
bainite
thermal expansion
hot rolling
