火焰切割法取样加工余量对Q345B钢板力学性能的影响

Effect of sampling processing allowance of flame cutting method on mechanical properties of Q345Bplate

通过对火焰切割法取样的热轧Q345B钢板进行拉伸、常温冲击、硬度和金相组织检测试验,得到了距离火焰切割线不同位置试样的力学性能,研究了加工余量对钢板力学性能的影响。结果表明,热轧Q345B钢板距火焰切割线1.5mm范围内,其显微组织受到了影响;取样加工余量大于5mm时,钢板力学性能及硬度不受影响。因此,减小火焰切割加工余量可以提高钢板综合成材率。

The mechanical properties of hot rolled Q345Bplate sampled by flame cutting method were tested in terms of tensile,impact at room temperature,hardness and metallographic properties.The effects of processing allowance of flame cutting on mechanical properties of plate were studied.The results show that the microstructure of plate is affected within 1.5mm distance from flame cutting line,and the mechanical properties are not affected when the sampling margin is more than 5mm.Therefore,reducing the margin of flame cutting of Q345Blow alloy steel plate can improve the comprehensive yield.