Abstract：Nine elements including carbon, silicon, manganese, phosphorus, sulphur, chromium, nickel, copper and aluminum were quantitatively analyzed in middle-low alloy steel by laser-induced breakdown spectroscopy. By taking iron as the internal standard and applying signal integration averaging method, the effect of experiment parameters on laser spectroscopy signals, such as the height of sample stage, laser focus position, delay time and gas environment, were studied. Through repeated experiments, 4 mm below the sample surface was selected as the optimal focusing distance, and 4 000 Pa was selected as the optimal argon environment. Under optimal conditions, the linear correlation coefficients of nine elements in steel standard samples GSBH40068-93 are all above 0.99. This method was applied to the direct determination of middle-low alloy steel samples with rust surface without sample pre-treatment. The result was consistent with the spark spectrum measurements.
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