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...

C - Chemistry, Metallurgy

21

D

C21D 1/26 (2006.01) C21D 1/68 (2006.01) C21D 1/70 (2006.01) C21D 1/76 (2006.01) C21D 9/67 (2006.01)

Patent

CA 2183089

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

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