METHOD FOR PRODUCING IMPROVED COLD ROLLED STRIP THAT IS CAPABLE OF BEING DEEP DRAWN OR IRONED AND COLD ROLLED STRIP PREFERABLY USED FOR PRODUCING CYLINDRICAL CONTAINERS AND IN PARTICULAR BATTERY CONTAINERS

摘要

It is recommended to produce a high quality cold rolled strip capable of deep drawing or ironing with a carbon content of less than 0.5% by weight. Also recommended are cold rolled strips which can be produced by deep drawing or ironing, preferably by the above method for producing cylindrical containers, in particular battery cases. Cold rolled strips with a cold rolling rate of 30 to 95% are subjected to heat treatment in the furnace and at least one of both strip surfaces, preferably subjected to electrolytic coating. In order to obtain isotropic steel strips with a low tendency of earing and low texture, the coating layer produced once or several times contains elemental nickel / cobalt / iron / bismuth / indium / palladium / gold / zinc or alloys thereof, and the heat treatment In a strip burning furnace operating continuously, at a temperature equal to or higher than the boundary temperature up to the austenite region (γ region), it is performed by the combustion performed before or after coating.