초록 ▼

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 s

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 H2/H 2O ratio which is less than 6.

대표청구항 ▼

Process for treating a steel sheet for the purpose of enamelling same and in particular directly enamelling the sheet with one coat, comprising depositing on the sheet, after rolling the sheet, a coat of a material selected from the group consisting of nickel, cobalt, and mixtures thereof, nickel ac

Process for treating a steel sheet for the purpose of enamelling same and in particular directly enamelling the sheet with one coat, comprising depositing on the sheet, after rolling the sheet, a coat of a material selected from the group consisting of nickel, cobalt, and mixtures thereof, nickel acetate, nickel nitrate, cobalt acetate, cobalt nitrate and mixtures thereof in an amount of 0.45-20 g/m2 calculated as the elemental metal, annealing the sheet under a decarburizing atmosphere consisting of hydrogen, water vapour and nitrogen, the hydrogen content being 10-75% and the H2/H2O ratio being within the range from 3 to 6, to substantially totally decarburize it and, during the cooling step of the annealing cycle, subjecting the coated sheet to the action of an oxidizing atmosphere of hydrogen, water vapour and nitrogen containing 2-7% water vapour and having a H2/H2O ratio which is less than 6.