ISO 16592:2012给出了使用校准曲线法测定含其他合金元素（质量分数小于1%至2%）的钢中碳含量的方法指南。它规定了样品制备、X射线检测、校准曲线的建立以及测定测量碳含量不确定度的程序。它适用于碳质量分数小于1.0%的钢。该方法不适用于含碳量较高的钢，这可能会显著影响分析结果的准确性。 ISO 16592适用于使用正常光束入射和波长色散X射线光谱法进行的分析；它不是为能量色散X射线光谱法设计的。

ISO 16592:2012 gives guidance on a method for the determination of the carbon content in steels containing other alloying elements (less than 1 % to 2 % by mass) using the calibration curve method. It specifies the sample preparation, X-ray detection, establishment of the calibration curve and the procedure for the determination of the uncertainty of the measured carbon content. It is applicable to steels containing a mass fraction of carbon of less than 1,0 %. The method is not applicable to steels with higher carbon contents, which could significantly affect the accuracy of the analysis results. ISO 16592 applies to analyses performed using normal beam incidence and wavelength-dispersive X-ray spectrometry; it is not designed to be used for energy-dispersive X-ray spectrometry.