利用光学显微镜、扫描电子显微镜、能谱分析仪、X-射线衍射仪、拉伸试验机和电化学工作站等研究了服役36891 h的Super304H过热器管的组织及性能变化.结果表明,服役36891 h管的强度仍满足GB/T 5310-2008的规定,伸长率略低于标准.服役管基体组织为奥氏体和孪晶组织,晶粒粗大,晶界大量析出呈链状分布M23C6.经DL-EPR分析,服役36891 h管的晶间腐蚀敏感性较供货态新管显著升高.
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