Process for treating steel sheets for the purpose of enamelling the sheets

US4012239A · kind A · utility

Assignee

• Union Siserurgique du Nord et de l'Est de la France, par abreviation USINOR · FR

Inventors

• Charles Brun · Chantilly, FR
• Philippe Marcel Rene Tirmarche · Prouvy, FR

Key dates

• Filing date: Mar 6, 1975
• Grant date: Mar 15, 1977
• Expiry date: Mar 6, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23D3/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

For treating a steel sheet for subsequent enamelling of the sheet with one coat of enamel: After rolling the sheet, there is deposited thereon a coat of nickel and/or cobalt, a salt of said metals or mixtures of said salts. After drying, the sheet is annealed in a decarburizing atmosphere so as to substantially totally decarburize it and, during the cooling of the annealing cycle, the coated sheet is subjected to the action of an oxidizing atmosphere containing 2 to 7% of water vapor and having an H.sub.2 /H.sub. 2 O ratio which is less than 6.