Abstract：The determination accuracy of total oxygen content in steel sample in bath analysis is affected by many factors. The previous studies were mainly focused on the establishment of analysis method and the pretreatment of sample, but there were few discussions on the sample preparation. In this paper, the influence of adding cooling liquid or not, the surface roughness and forging or not in turning process of steel sample on the analytical results of total oxygen was investigated and discussed. The feasible solutions were proposed. The samples were processed to different roughness levels for analysis of total oxygen content. The internal morphologies of standard sample and samples with and without forging treatment were characterized using scanning electron microscope with same magnification. Meanwhile, the effect of forging process on sample uniformity was analyzed. The measurement results were compared with the precision of national standard method. It was found the determination results were not influenced when the surface roughness of sample was less than 6.0 μm. However, the stability of analysis results of total oxygen was affected by the forging process. The relative standard deviation (RSD, n=9) different between the samples with and without forging treatment was 13.6%. The experiments results indicated that the surface scale should be cleaned followed by forging for the determination of total oxygen content. The analytical results of proposed method were stable with high reliability.
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