Abstract
A coulometric study was made on the possible existence of deviation in carbon values of commercial standard samples of iron and steels.
A standard sample preliminarily selected (A) was at first analysed for calibrating the apparatus against the certified value of this standard and, successively, the value XA for the common reference sample X was obtained. The apparatus was then recalibrated against another standard sample (B) and the value XB was obtained for the above reference X. By repeating this procedure, the analyses were done for a number of stainless steels (A……D), carbon steel and low alloy steels (a……d), and the corresponding values for the common reference (XA……XD) and (xa……xd) were subjected to variance analysis to know whether there was any significant difference between them.
The result indicated an existence of statistical variance among certified carbon value of those standard samples, especially between carbon values of NBS stainless steel and BCS stainless steel.
