一、前言热电站设计寿命一般为十万小时。在我国,540℃、100大气压电站的高压锅炉主蒸汽管很多部门都已到达设计寿命。为了保证安全使用及延长使用寿命,必须对超设计寿命使用的管子进行寿命估算。为了提高经济效益,尽可能使一些到期的管子继续使用,但目前在理论和实验上尚未找到可靠的依据。有人认为, First, the preface Thermal power station design life is generally 100,000 hours. In our country, many departments of high pressure boiler main steam pipe at 540 ℃ and 100 atmospheric pressure stations have reached the design life. In order to ensure the safe use and prolong the service life, we must estimate the service life of the pipe used for the design life. In order to improve economic efficiency, as far as possible some of the expired pipe to continue to use, but at present no theoretical and experimental evidence to be found. Some people think,