Abstract
Two different ultrasonic methods have been used to rate the cleanliness of steel plate. One in based on the standard ASTM method, but with a modified counting system; the second, developed by the Centro Sperimentale Metallurgico (CSM) permits fullscale mapping of the flaws in a selected layer of the sample, ie sonography. Using these sonographs a scale of macroflaws has been established; the CSM method also provides the possibility of obtaining sonographs which show the nature of flaws as well as their size and position. Computerized statistical analysis has shown significant correlations between the cleanliness rating and impact strength and the percentage of elements in the steel composition.
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