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从目前世界火力发电技术水平看,提高火力发电厂效率的主要途径是通过提高蒸汽的参数。国内外投用的超超临界机组其蒸汽压力与蒸汽温度已分别达到31.4MPa,蒸气温度有的已经超过600℃,就要求机组关键部件金属材料使用在更高温度下保持高温强度的钢材。应该说,火电技术的发展在很大程度上依赖于材料技术的发展水平。自20世纪80年代以来,欧美、日本等已相继开发出一系列用于临界甚至超临界参数下的各类耐热钢材,其中典型的如T91/P91、T92/P92、T122/P122、Super304H等,这些钢材已成为我国新建大容量高参数机组的首选材料。
From the current world level of thermal power technology, the main way to improve the efficiency of thermal power plants is by increasing the steam parameters. The steam pressure and steam temperature of the ultra-supercritical units put into operation both at home and abroad have respectively reached 31.4MPa and some steam temperatures have exceeded 600 ℃, so the key components of the unit are required to use the steel material which keeps the high temperature strength at higher temperature. It should be said that the development of thermal power technology depends largely on the level of development of materials technology. Since the 1980s, Europe, the United States, Japan and other countries have successively developed a series of heat-resistant steels for critical and even supercritical parameters. Typical examples are T91 / P91, T92 / P92, T122 / P122 and Super304H These steels have become the material of choice for newly built high-capacity high-parameter units in China.