Abstract：The carbon-sulfur analyzer usually adopts standard samples to establish the calibration curve for the direct determination of carbon and sulfur contents in unknown samples. Long-term monitoring and use of instrument and calibration curves are achieved by the real-time verification of standard samples or control samples. Therefore, it is very necessary to obtain the long-term stability time limit (TMAX) of the instrument. Generally, the long-term stability test is to monitor the accuracy of measurement results, including the precision and trueness. The long-term stability test of carbon-sulfur analyzer in the laboratory was designed. Based on the repeatability, within-laboratory reproducibility precision data and χ2 statistic in relevant standards, the precision and trueness of each period, repeatability of periods, overall precision among periods and trueness of grand mean of measurement data were tested. The results showed that the upper limit of long-term stability time was 7h for the carbon-sulfur analyzer. The correction of instrument was not required during this time, saving the time and cost.
孙晓飞, 蔺菲, 贾云海. 碳硫分析仪长期稳定性测量方法研究[J]. 冶金分析, 2019, 39(2): 1-7.
SUN Xiao-fei, LIN Fei, JIA Yun-hai. Study on the measurement method of long-term stability for carbon-sulfur analyzer. , 2019, 39(2): 1-7.
ISO 15350:2000 Steel and iron-Determination of total carbon and sulfur content-Infrared absorption method after combustion in an induction furnace (routine method)[S].International Organization for Standardization,2000.
[6]
ASTM E1019:2018 Standard test methods for determination of carbon,sulfur,nitrogen,and oxygen in steel,iron,nickel,and cobalt alloys by various combustion and fusion techniques[S].ASTM International,2018.
[7]
ASTM E1915:2013 Standard test methods for analysis of metal bearing ores and related materials for carbon,sulfur,and acid-base characteristics[S].ASTM International,2013.
[8]
ASTM E2050:2017 Standard test method for determination of total carbon in mold powders by combustion[S].ASTM International,2017.
[9]
ASTM E1941:2010(2016) Standard test method for determination of carbon in refractory and reactive metals and their alloys by combustion Analysis[S].ASTM International,2016.
[10]
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.
