Manufacturing method of steel plate for can making

Abstract

Provided is a method of manufacturing a steel sheet for cans. The method includes providing a slab by continuous casting of a steel having a component composition of, in mass%, C: 0.005% or less, Mn: 0.05 to 0.5%, Al: 0.01 to 0.10%, N: 0.0010 to 0.0070%, B: 0.15×N to 0.75×N (0.15 to 0.75 in terms of B / N), and one or both of Nb: 4×C to 20×C (4 to 20 in terms of Nb / C) and Ti: 2×C to 10×C (2 to 10 in terms of Ti / C), and the balance of Fe and inevitable impurity elements; rough rolling the slab; finish rolling the rough-rolled slab wherein 5% or more and less than 50% of the total amount of rolling reduction in the finish rolling is hot-rolled at a temperature lower than the Ar 3 transformation point; winding the hot-rolled steel sheet at a winding temperature of 640 to 750°C; pickling the coiled steel sheet; cold rolling the pickled steel sheet at a rolling reduction rate of 88 to 96%; and annealing the cold-rolled steel sheet in a temperature range of higher than 400°C to a temperature that is 20°C lower than the recrystallization temperature. According to this manufacturing method, a steel sheet for cans having a reduced variation in thickness in the longitudinal direction of the steel sheet coil and high strength and ductility necessary for manufacturing cans.

Description

technical field [0001] The present invention relates to a method for manufacturing a steel plate for can making that has high strength and excellent thickness accuracy. Background technique [0002] Cans such as beverage cans, food cans, 18-liter cans, and drum cans can be roughly divided into two-piece cans and three-piece cans according to their manufacturing methods (processes). [0003] The two-piece tank consists of two parts, and is applied to surface-treated steel sheets that have been treated with tin plating, chrome plating, metal oxide coating treatment, chemical conversion treatment, inorganic coating treatment, organic resin coating treatment, and oiling. Shallow drawing processing, DWI processing (Drawing and Wall Ironing Process), DRD processing (Drawing and Redrawing Process) and other processing, the tank bottom and tank body are formed into one, and then the lid is installed on it. [0004] A three-piece can is composed of three parts. Surface-treated steel...

AI Technical Summary

Problems solved by technology

However, in the steel sheet produced under such conditions, there is a problem that the thickness uniformity in the longitudinal direction of the steel sheet coil is degraded.

[0018] In addition, in Patent Document 2 and Patent Document 3, a high-strength steel sheet is obtained by performing annealing without recrystallization, and the hot rolling performed in the Ar 3 40% or 50% or more of rolling is performed below the point. In this case, the strength of TS600MPa to 850MPa targeted by the present invention cannot be obtained even with annealing without recrystallization.

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