Process for avoiding stickers in the annealing of cold strip

Details Process for avoiding stickers in the annealing of cold strip Process for avoiding stickers in the annealing of cold strip

1996-08-20

1998-07-28

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148596, 148703, C21D 9663

Patent

active

057857733

ABSTRACT:
When cold strip is annealed, diffusion welds, so-called stickers, frequently form on the strip surface. In order to avoid these, the cold strip, above 600.degree. C. (holding time) is coated by oxidation with a thin surface film which prevents the sticking together. Below 600.degree. C., during the cooling phase, this surface film is removed again by reduction. In the case of a protective gas comprising a hydrogen content greater than 5%, remainder nitrogen, carbon dioxide is preferably added as oxidizing agent. The process is controlled via a defined oxygen partial pressure. The reduction is performed via the hydrogen.

REFERENCES:
patent: 5344509 (1994-09-01), Zylla
Iron and Steel Engineer, Bd. 67, Marz 1990, Pittsburgh, US, Seiten 25-29, XP000141232 R.A. Enghofer et al.: "Experience with 100% hydrogen . . . ".
Stahl und Eisen, Bd. 109, Nr. 4, 27. Feb. 1989, Dusseldorf, DE, Seiten 178-184, XP002016935 O. Pawelski et al.: "Entstenhung von Bandklebern . . . ".

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