Abstract：The sample was prepared by two methods, i.e., milling and abrasive belt grinding. The analysis results of ultra-low carbon in IF steel by spark source optical emission spectrometry indicated that the precision of determination data of milling method were better than those of abrasive belt grinding method. However, the samples were cylindrical in smelting production, and the sample surface was slant to a certain extent after cutting with grinding wheel cutting machine. Many times of milling were required for sample preparation. The time-consuming operation limited its application in fast-paced production. The analysis results of one production sample after grinding with new abrasive belt and old abrasive belt showed that the data fluctuation was large and the results were higher for new abrasive belt than those of old abrasive belt. The factors influencing the determination of ultra-low carbon by spark source optical emission spectrometry were comprehensively analyzed. Apart from sample preparation, the determination of ultra-low carbon was also greatly affected by the argon purity, the cleanliness degree of excitation chamber and type standardization. For the sample preparation mode by abrasive belt grinding, the precision test was conducted using two production samples with different contents of ultra-low carbon. The standard deviation was 0.000 09% and 0.000 14%, respectively. According to three times of standard deviation (confidence coefficient of 99.7%), the repeatability limit was 0.000 27% and 0.000 42%, respectively, which could meet the production requirements. After type standardization, the determination results of ultra-low carbon in IF steel production samples by spark source optical emission spectrometry and infrared carbon-sulfur analyzer were compared, and the difference was not higher than 0.000 5% for carbon, indicating the good consistence. The statistical analysis of many production data was performed. The target difference and bounds was set as 0 and ±0.000 6%, respectively. The process capability index (Cpk) under this condition was calculated by MINITAB software. The value was 1.16, which was between 1.0 and 1.33. According to the grade evaluation and management principle, the grade was level B. In other words, the process control capability was good.
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