Abstract：The measurement precision is an important criterion to judge whether the analysis results of components in steel are acceptable or not. In current national standards, the measurement precision is a basic requirement for the analysis of carbon steel and low alloy steel. Certain limitations may exist for some specific steel products. Therefore, the corresponding precision should be calculated in the laboratory using professional statistical methods according to the inspection process. In order to improve the efficiency, new precision tests were not conducted in the proposed study. Instead, it took full advantage of the existing routine quality control data. According to the requirements of GB/T 6379, total 60 groups of measurements results of standard samples (GBW01401a and 498) for quality control by two oxygen-nitrogen analyzers (ON-836 and TC600 with different degrees of new or old) were used for calculation. The repeatability limit and indoor reproducibility limit were obtained, which were close to or even better than the national and industrial standards. The resultant precisions have been applied for the laboratory production and measurement system analysis. In order to carry out the routine quality control in laboratory specifically, the classification of indoor reproducibility limit into indoor instrument reproducibility limit and indoor daytime reproducibility limit was suggested. Therefore, there was basis to judge whether the analysis results of two instruments were acceptable or not.
沈克, 刘步婷, 张兆雄, 贾丽晖. 利用氧氮仪日常质控数据计算钢中氮测量精密度[J]. 冶金分析, 2020, 40(1): 17-21.
SHEN Ke, LIU Bu-ting, ZHANG Zhao-xiong, JIA Li-hui. Calculation of measurement precision of nitrogen in steel by using daily quality control data of oxygen-nitrogen analyzer. , 2020, 40(1): 17-21.
IATF 16949:2016 Quality management system requirements for automotive production and relevant service parts organizations[S].International Automotive Task Force.
ISO TR21074:2016(E) Application of ISO 5725 for the determination of repeatability and reproducibility of precision tests performed in standardization work for chemical analysis of steel[S].International Organization for Standardization.
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贾云海,孙晓飞,袁良经.分析仪器长期稳定性表征方法研究[J].冶金分析,2019,39(1):1-7.JIA Yun-hai,SUN Xiao-fei,YUAN Liang-jing.Research on the characterization of long-term stability for analytical instrument[J].Metallurgical Analysis,2019,39(1):1-7.
