Abstract
For the reliable determination of carbon contents of a few μg/g in low and ultra‐low carbon steels by the combustion method with commercially available carbon analyzers special measures as surface cleaning by chemical etching, pre‐treatments of crucible and accelerator materials, or in‐situ desorption of contaminations have to be taken. A new technique including firstly, the pre‐burning of copper for degassing the ceramic crucible and, secondly, the desorption of carbonaceous contaminations from the surface of the sample and the Cu‐accelerator by placing together into the still hot crucible yields a detection limit of about 0.5 μg/g carbon. The technique was checked with granular and compact iron samples, and the results were compared with those of investigations with special devices for fractionated, temperature controlled combustion.
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