An example of bulk analysis is shown to the left: the sample is a certified stainless steel no. 465/1. The certified concentrations (mass %) are shown along with the values measured by GD-OES.
The GD-OES analysis was the average of two burns, with three measures in each burn, an RF power of 70 W, a pre-integration time of 240 s and an integration time of 15 s.
The standard deviation estimated from the 2 times 3 measurements only partly represents the uncertainty of the measured values. The uncertainties of the calibration coeficients and possible drift correction factors must be included in the estimation of the total measurement uncertainty.
The composition of typical iron and steel products is given in the following table.
|Unalloyed steels||Fe, plus many elements less than about 0.1 to 0.5%, but with Mn <= 1.8%|
|Alloy steels||Fe, plus many elements with high concentrations, especially Co, Cr, Mn, Mo, Ni, W, but with C <= 2%|
|Iron||Fe, plus some elements with high concentrations, especially Cr, Ni, but with 2% <= C <= 4.5%|
First published on the web: 6 November 2000
Authors: Richard Payling & Thomas Nelis.