Community Research and Development Information Service - CORDIS


In enamelled steel products the most dangerous defect is fishscaling due to an excess of hydrogen absorbed during the enamelling. Enamelled hot-rolled steel is less resistant to the defect than the corresponding cold-rolled steel owing to the deficiency of hydrogen trapping sites.
The purpose of this study is to examine new compositions and manufacturing cycles in order to improve the resistance to the defect compatible with the deep-drawing quality of steel.
The greatest problem is to measure correctly solubility, diffusivity and residence time of hydrogen in enamelled steel. Three different measurement techniques have been developed.
With these methods low carbon steel and titanium steel have been examined. With crossed measurements of permeation and degassing, the quantities of irreversible traps have been measured and the effect of the reversible ones has been evaluated both as a function of simulated thermal treatments and modifications of the chemical composition. From the results, it follows that a modification of manufacturing cycles is not efficient; a modification of the chemical composition is more suitable.

Additional information

Authors: DE GREGORIO P, Centro Sviluppo Materiali, Roma (IT);BUONPANE A, Centro Sviluppo Materiali, Roma (IT);VALENTINI R, Centro Sviluppo Materiali, Roma (IT)
Bibliographic Reference: EUR 15764 IT (1996) 73pp., FS, ECU 10
Availability: Available from the (2)
ISBN: ISBN 92-827-6548-2
Record Number: 199410800 / Last updated on: 1995-03-21
Original language: it
Available languages: it