Abstract：Iron-chromium-aluminum (FeCrAl) stainless steel is a very important electrothermal alloy material. The precise control of Al content has an important effect on improving its performance. The calibration curve was prepared using international standard samples and self-made control samples of Taigang FeCrAl stainless steel. Al 308.22 nm was selected as the analytical line. A method for the determination of high content Al (the mass fraction of Al was in range of 0.46%-6.12%) in FeCrAl stainless steel by spark discharge atomic emission spectrometry was established. The ordinary stainless steel and FeCrAl stainless steel samples with similar contents of other elements except for Al were used as the control group for metallographic observation. The results showed that the grain size of the ordinary stainless steel sample was small, while the grain size of the FeCrAl stainless steel sample was obviously refined, and the boundary contour was dense and clear, indicating that the surface of the FeCrAl stainless steel sample was relatively dense. It may be the reason that why the excitation intensity of the FeCrAl stainless steel sample was more affected by its surface, and the measurement results fluctuated greatly. The effect of pre-burning time on the determination was investigated. The results showed that the excitation intensity of Al was relatively stable when the pre-burning time was 8-11 s, so the pre-burning time of 11 s was finally adopted. Three FeCrAl stainless steel samples with different Al contents were selected and analyzed for 10 times according to the experimental method. Meanwhile, the inductively coupled plasma atomic emission spectrometry (ICP-AES) was used for method control test. The results showed that the determination results of two methods had a good consistency. The relative standard deviations (RSD, n=10) of determination results of experimental method were between 0.53% and 0.98%.
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