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The difference in the enamelling behaviour of continuously-cast steels compared with ingot steels stems from the diversity in the state of the final surface of the cold rolled sheets. The aim of this study is to achieve greater reproducibility of surface reactivity and to improve adherence of the enamel to cold rolled strip produced from continuously cast steel, with special reference to the direct enamelling process. A detailed examination has been made of the chemical and physical changes that occur on the surface of the steel during the manufacturing process, especially between the OC decarburising annealing and the enamelling stages. For this purpose, use has been made both of spectroscopic surface analysis techniques and works test data relating to current production of UNISMALT steel and laboratory specimens of similar composition. It has been possible to distinguish two diverse routes which, with reproducible characteristics, starting from the pickling stage, lead to two very different final results as regards enamel adherence. While the reproducibility of surface reactivity depends mainly on the basic composition, the adherence quality depends on the annealing. The results obtained to date indicate the need for more thorough knowledge of the surface segregation mechanisms in order to be able to prepare the steel for various enamelling processes and hence to meet adequately the new demands being made by the sector.

Additional information

Authors: DE GREGORIO P, Centro Sviluppo Materiali, S.p.A., Roma (IT);FIERRO G, Centro Sviluppo Materiali, S.p.A., Roma (IT)
Bibliographic Reference: EUR 12507 IT (1989) 107 pp., MF, ECU 8, blow-up copy ECU 13.75
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