Abstract：The shape and size of inclusions can be well controlled by magnesium treatment in steel smelting process, so it is of great significance to accurately determine the content of residual magnesium in steel. At present, the quantification limit of magnesium in relevant national standards cannot meet the detection requirements of magnesium in alloy steel. The calibration curve was prepared using standardized sample of pure iron and international standard samples of low alloy steel containing 0.00005%-0.0043% of magnesium (mass fraction). The matrix effect was eliminated by interference deduction and correction. The determination method of trace magnesium in alloy steel by spark discharge atomic emission spectrometry was established. The quantitative analysis range of was 0.0001%-0.0010%. The limit of detection and the limit of quantification were 0.00003% and 0.0001%, respectively. The morphology of inclusions in steel billet after magnesium treatment was analyzed by electron probe-energy disperse spectroscopy. It was found that the inclusion size was relatively small. The main components were MgO and Al2O3, which were wrapped together to form MgO·Al2O3 with poor acid solubility. The certified reference materials of magnesium-bearing steel (CRM196-2 and BS4130) were used for method verification. The found results were consistent with the certified values. The relative standard deviations (RSD, n=5) were between 2.6% and 9.2%. The production sample was analyzed according to the experimental method, and the found results were consistent with those obtained by chemical wet method
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