Method of production of hot dip galvannealed steel sheet...

C - Chemistry – Metallurgy – 23 – C

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C23C 2/06 (2006.01) C21D 9/46 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01) C23C 2/02 (2006.01) C23C 2/26 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2648429

A process for producing an alloyed hot-dip zinc-coated steel sheet which has better processability than steel sheets produced by the Sendzimir process and non-oxidizing furnace process and is satisfactory also in non-powdering properties and sliding properties. The process is characterized by: subjecting a steel billet which contains, in terms of mass%, 0.01-0.12% C, 0.05-0.6% Mn, 0.002-0.1% Si, up to 0.05% P, up to 0.03% S, 0.005-0.1% sol.Al, and up to 0.01% N, the remainder being Fe and unavoidable impurities, to hot rolling, pickling, and cold rolling; subsequently annealing the work at 650-900°C; cooling it to 250-450°C and holding it for 120 seconds or longer; thereafter cooling the work to room temperature; pickling the cooled work; preplating it with nickel or nickel-iron without conducting temper rolling; heating it to 430-500°C at a rate of 5 °C/sec or higher; plating the heated work with zinc in a plating bath; wiping the plated work; heating it to 460-550°C at a heating rate of 20 °C/sec or higher; cooling it at a rate of 3 °C/sec or higher either without soaking or after soaking for less than 5 seconds; and then conducting final temper rolling so as to result in an elongation of 0.4-2%.

Il s'agit d'un processus de fabrication de toles d'acier enduites de zinc par immersion à chaud plus faciles à traiter que les toles d'acier produites par procédé Sendzimir ou dans les fours non-oxydants et qui a d'excellentes propriétés de non farinage et de glissement. Le processus consiste à soumettre un lingot d'acier de la composition chimique suivante, en % massique, 0,01-0,12% C, 0,05-0,6% Mn, 0,002-0,1% Si, jusqu'à 0,05% P, jusqu'à 0,03% S, 0,005-0,1% sol.Al, et jusqu'à 0,01% N, le reste étant Fe et les impuretés inévitables, à un laminage à chaud, un décapage et un laminage à froid; recuisant l'ensemble à 650-900°C; le refroidissant à 250-450°C et le maintenant pendant 120 secondes ou plus, puis refroidissant le tout à température ambiante. Ensuite décapage de l'ensemble refroidi, pré-galvanisation au nickel ou au fer-nickel sans écrouissage à froid, chauffage à 430-500°C à un taux de 5 °C/sec ou plus; plaquage de l'ensemble chaud avec du zinc dans un bain de placage; essuyage de la pièce revêtue, chauffage à 460-550°C à un taux de chauffage de 20 °C/sec ou plus; refroidissement à un taux de 3 °C/sec ou plus soit sans broyage soit après un broyage de moins de 5 secondes; puis écrouissage final pour obtenir une élongation de l'ordre de 0,4-2%.

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