目前,在我国铁路上,蒸汽机车仍是主要的牵引动力。以前,机车锅炉内的火箱板,一直是用A3H普通低碳钢钢板制造。近年来,为了强化机车的工作能力,随着牵引量与运行速度的不断增加,发现机车上,特别是在主型货运机车锅炉内的火箱板上,发生严重的波浪变形及环形裂纹等病害。根据经验分析,这是锅炉火箱在较高的工作温度下(300～400℃),由于各种变动温度和机械应力作用而引起的金属失效,从而导致了大量换板,耗损钢材,并增加了维修费用。 At present, steam locomotives are still the main traction power in China’s railways. In the past, firebox panels in locomotive boilers have been made of A3H plain mild steel plates. In recent years, in order to strengthen the locomotive’s ability to work, with the increasing traction and running speed, it was found that locomotives, especially in the main cargo locomotive boiler firebox plate, serious wave deformation and annular cracking and other diseases . According to empirical analysis, this is the boiler firebox at higher working temperature (300 ~ 400 ℃), due to various temperature changes and mechanical stress caused by the metal failure, resulting in a large number of change board, wear the steel, and increase The maintenance costs.