对核电厂高压加热器用不锈钢换热管材料进行分析,包括成分分析、金相分析、拉伸性能、硬度、反向压扁、压扁、卷边等。结果表明,TP439换热管的内外壁存在粗晶粒,粗晶现象为临界再结晶的结果;TP439换热管的抗拉强度均不满足标准要求。 Analysis of stainless steel heat exchange tubes used in high pressure heaters in nuclear power plants, including composition analysis, metallographic analysis, tensile properties, hardness, reverse flattening, flattening, curling and so on. The results show that there are coarse grains on the inner and outer walls of the TP439 heat exchange tube, and the coarse grain phenomenon is the result of the critical recrystallization. The tensile strength of the TP439 heat exchange tube does not meet the standard requirements.