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添加0．03％、0．05％、0．1％的稀土元素，使得铸造Fe－Cr－Ni－Al耐热合金在1200℃、1250℃和1300℃下的氧化速率显著降低。稀土元素可减小氧化膜变形和开裂的倾向并能够明显地使得氧化膜表面突起上的蚀坑变小、变少。
Addition of 0.03%, 0.05%, 0.1% rare earth elements resulted in a significant reduction of the oxidation rate of the cast Fe-Cr-Ni-Al heat-resistant alloy at 1200 ° C, 1250 ° C and 1300 ° C. The rare earth element can reduce the tendency of the oxide film to deform and crack, and can significantly reduce and reduce the etch pits on the surface of the oxide film.