P91的热处理工艺探讨

P91 Heat Treatment Craft

大管径厚壁P91的焊后热处理,国内目前普遍采用的电阻加热方式存在一定的弊端,周向及径向存在温度差,造成局部回火不存分或超过材料的Ac1,对材料的使用性能造成影响,而感应加热设备因其加热原理的不同,可以很好地改善这一状况。

PWHT for P91 pipe,electric resistance heating was used widely now,but the method has some abuses like differences in temperature at radial and circle,it will result in bad material properties.Induction heating can improve this status depending on different heat exchange methods.