针对近年来出现的再热裂纹引起的电站锅炉小管泄露事故,开发了小试样插销试验机,用于对电站锅炉薄壁管件取样进行插销试验,以评定其冷裂纹再热裂纹倾向。利用开发的试验机对某电厂再热器联箱管接头进行了再热裂纹试验,结果表明部分管接头的再热裂纹敏感温度处于其工作温度内,这造成其在使用过程中发生泄露事故。 In view of the leakage of tubular burners of power station boiler caused by reheat cracking in recent years, a small sample plug testing machine was developed for plug testing the sample of thin-walled tubular parts of power station to evaluate the tendency of cold crack reheat cracking. The reheat crack test was carried out on the reheater header pipe joint of a power plant by using the developed testing machine. The results showed that the reheat crack sensitivity temperature of some pipe joints was within the working temperature, which resulted in the leak during the operation.