借助自制的蒸汽氧化装置，在650℃下对三种不同晶粒度的TP347HFG瓦片状试样进行不同时间的模拟蒸汽氧化试验，利用光学显微镜、扫描电镜、能谱和X射线衍射等分析方法，研究了管样内壁的氧化层形貌、成分和相组成．结果表明：在本文试验条件下，晶粒度均匀的试样形成的氧化层厚度均匀，晶粒细化有利于提高钢的抗水蒸汽氧化性能．因而，国内钢管制造厂商要严格控制这类钢管晶粒度级别和级差．
Steam oxidation test of various time durations was carried out for three types of domestic TP347H FG steel tube samples with different grain sizes using a facility of steam oxidation at 650 ℃. Morphology, composition and phase constituent of the steam oxide scale on samples were characterized using light optical microscopy （LOM）, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscope （EDX） and X-ray diffraction （XRD）. The results showed that the steel with fine grains and also a high equality in grain size may facilitate the formation of a thin and umiform oxide scale and therewith the smaller is the grain size, the greater is the resistance to steam oxidation of the steel. Therefore, the grain size of TP347H FG steel tubes and the difference in grain size could be controlled strictly by domestic manufacturers.
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