随着电站锅炉向着大容量、高参数发展,金属材料的强度研究推向新水平。在过热器管系中,国外已较广泛地选用马氏体级耐热钢来取代珠光体级钢。我国也已开始引进了一些这类锅炉钢管,且用于壁温较高的再热器和过热器管段,或用于更换电站检修设备的旧管。由于原管段系珠光体低合金耐热钢,因此,新旧管段对接时,必须解决珠光体与马氏体异种钢 With the development of power plant boilers towards high capacity and high parameters, the research on the strength of metal materials has been pushed to a new level. In superheater piping, foreign countries have been more widely used martensitic grade heat-resistant steel instead of pearlite grade steel. Our country has also started to introduce some of these boiler tubes, which are also used for reheater and superheater pipe sections with high wall temperatures or for replacement of old pipes of power station servicing equipment. Because the original pipe is pearlite low alloy heat-resistant steel, therefore, the new pipe section docking, you must solve the pearlite and martensite dissimilar steel