Abstract：The content of sulfur (mass fraction, similarly hereinafter) in austenitic free-cutting stainless steel is higher than 0.2%. The conventional measurement methods include infrared absorption and inductively coupled plasma atomic emission spectrometry (ICP-AES). However, these methods have some shortcomings such as slow sample preparation speed and few types of analytical elements, which cannot meet the rapid analysis requirements of steelmaking process. The analysis method of high content sulfur in austenitic free-cutting stainless steel by spark discharge atomic emission spectrometry was studied in experiments. The chemical and physical properties of austenitic free-cutting stainless steel sample were firstly analyzed, and the sample preparation method was investigated. Then the effects of measurement conditions and interference elements on the analytical results by spark discharge atomic emission spectrometry were discussed. The results showed that the sample preparation method of austenitic free-cutting stainless steel was unified to obtained the same measurement surface. New excitation electrode was used for the spark discharge atomic emission spectrometer. The austenitic free-cutting stainless steel sample was excited in the argon environment with purity not less than 99.995%. The precombustion time was 50 s and the measurement time was 12 s (800 Hz). The special calibration curve of sulfur with content range of 0.1%-0.4% in austenitic free-cutting stainless steel was drawn. The analytical results of high content sulfur in austenitic free-cutting stainless steel sample could be accurately obtained. For the austenitic free-cutting stainless steel samples with sulfur content of 0.122%, 0.264% and 0.387%, the relative standard deviation (RSD, n=11) of determination results was 3.8%, 1.3% and 0.81%, respectively. The t distribution critical value (t0.975,9＝2.262) was adopted to check the analytical results of spark discharge atomic emission spectrometry and infrared absorption method, and the inspection result was less than the critical value. It indicated that there was no obvious different between the determination results of spark discharge atomic emission spectrometry and infrared absorption method. The proposed method could be used to stably determine the content of sulfur in austenitic free-cutting stainless steel.
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