Through comparative experiments using spark discharge atomic emission spectroscopy(referred to as the spectroscopic method)on ultra-low carbon steel(w(C)≤0.003%)with different alloy compositions,it was found that there are significant differences in the accuracy of carbon content detection by the spectroscopic method among samples with different silicon contents.Excessively high silicon content(w(Si)≥0.8%)resulted in noticeable differences in the metallographic structure,causing the detected carbon values to be higher.Additionally,high silicon content also led to a slower cooling rate during the sample cooling process,increasing the quantity of precipitates.An increased amount of precipitates contributes to higher evaporation energy during the spectroscopic evaporation process,which further results in elevated carbon values in the spectroscopic analysis.
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