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The insoluble aluminum content in steels has an important influence on the quality of the steel.In this paper,laser-induced breakdown spectroscopy(LIBS)was used to analyze the insoluble aluminum content in steel samples with scanning mode.The threshold value which was used to distinguish soluble and insoluble aluminum was calculated by an iteration method.In this method the value of summation of the average intensity and 2.5 times of standard deviations was iterated.Total and soluble aluminum content calibration curves were generated and can be used for the determination of the total and soluble aluminum contents in steel samples.The insoluble aluminum content could be calculated by subtracting the soluble aluminum content from the total aluminum content.The insoluble aluminum contents in standard spectrum steel samples and real steel samples were rapidly determined using this mathematical model.The results agreed well with the value obtained by chemical methods.