【摘要】 对某运行超过20万h的电站锅炉主蒸汽管道(材质为10CrMo910)进行取样，分别研究管道母材和焊缝的金相组织、机械性能和高温蠕变性能，通过数学模型预测其高温使用寿命。结果表明：在运行超20万h后，10CrMo910主蒸汽管道晶粒大小均匀，无明显的析出相聚集，处于稳态蠕变阶段。随着工作温度升高，韧性提高，管道和焊缝均保持良好塑性。使用等温线法预估，535℃、560℃、580℃下管道使用寿命均超过4.5万h,可以稳定运行。使用时应严格控制工作温度和压力，并增加检修次数，保证机组安全运行。更多还原

【Abstract】 The main steam pipe(10CrMo910 steel) of a utility boiler operating for more than 200 000 hours was sampled, the metallographic structure, mechanical properties and high-temperature creep properties of the pipe base metal and weld were studied respectively, and its high-temperature service life was predicted by mathematical model. The results show that after more than 200 000 hours of operation, the grain size of the main steam pipe is uniform, there is no obvious precipitation aggregation, and it is in the steady-state creep stage. With the increase of working temperature, the toughness increases, and the pipeline and weld maintain good plasticity. According to the isotherm method, the service life of the pipeline at 535 ℃, 560 ℃ and 580 ℃ is more than 45 000 hours, which can operate stably. During use, the working temperature and pressure shall be strictly controlled, and the maintenance times shall be increased to ensure the safe operation of the unit.更多还原