Abstract
Carburization that takes place in HP steel tubes in pyrolysis furnaces coils is an undesirable event, as it negatively affects mechanical and resistance to corrosion properties. This has been an important factor for the study and development of non-destructive methodologies aiming at maintaining structural integrity. In this work, non-destructive testing using ultrasound was employed for specimen with varying carburization degrees, in order to characterize them. The results allowed for the development of a correlation between the thickness of the carburized layer and of the half height bandwidth of the backwall echo frequency spectra.
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