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根据国外文献的报导及我国引进超临界机组的情况，论述了我国超临界机组汽缸、主汽阀壳等用材的研究方向。根据我国国情，我国发展超临界机组可能会分两步走，那么汽缸、主汽阀壳等用材也应分两步走。即当蒸汽参数为２４ＭＰａ／５３８／５６６℃时，汽缸、阀壳等推荐选用纯净ＣｒＭｏＶ铸钢，当温度为５９３℃或更高时，推荐选用１２％Ｃｒ铸钢。
According to the reports of foreign literature and the introduction of supercritical units in China, the research directions of the supercritical units such as cylinder and main steam valve shell in China are discussed. According to China’s national conditions, China’s development of supercritical units may be divided into two steps, then the cylinder, the main steam valve shell and other timber should be two steps away. That is, when the steam parameter is 24MPa / 538/566 ℃, pure CrMoV cast steel is recommended for the cylinder, valve shell, etc. When the temperature is 593 ℃ or higher, it is recommended to use 12% Cr cast steel.