Highly processable steel sheet for three-piece welded can and method for producing same

Abstract

Disclosed is a highly processable steel sheet for a three-piece welded can, which is suitable for practical use. The highly processable steel sheet for a three-piece welded can contains, in mass%, more than 0.0015% but 0.0030% or less of C, 0.10% or less of Si, 0.20-0.80% (inclusive) of Mn, 0.001-0.020% (inclusive) of P, 0.001-0.020% (inclusive) of S, more than 0.040% but 0.100% or less of Al, 0.030% or less of N, 0.0002-0.0050% (inclusive) of B, with the balance made up of Fe and unavoidable impurities. The highly processable steel sheet for a three-piece welded can has a tensile strength in the transverse direction to the rolling direction of 400 MPa or more, and an elongation at break in the transverse direction to the rolling direction of 15% or more. The steel sheet is able to be obtained by hot rolling a steel, which has the above-described composition, at a finish rolling temperature of not less than the Ar3 transformation point but not more than 960 DEG C and a winding temperature of 560-750 DEG C (inclusive), then subjecting the resulting to a primary cold rolling at a reduction of 89-93% and an annealing at 600-790 DEG C, and then subjecting the resulting to a secondary cold rolling at a reduction of more than 6.0% but less than 10.0%.

Description

technical field [0001] The present invention relates to a steel sheet for cans having good workability even when the sheet thickness is reduced, and a method for producing the same. Background technique [0002] In recent years, in order to expand the demand for steel cans, strategies to reduce the cost of canning have been adopted. As one of the strategies to reduce the cost of can making, the cost reduction of raw materials can be cited. Not to mention the two-piece cans subjected to deep drawing, even the three-piece cans with cylindrical forming as the main body have been advancing the thinner steel plates used. walled. [0003] For three-piece cans in which the body is cylindrically formed by welding, and the bottom and lid are joined to the body by seaming, SR (one-time Cold-rolled (Single Reduce) materials, steel plates with a thickness of about 0.175 mm are used for beverage cans such as coffee. [0004] In addition, as a method of thinning a steel sheet, there is...

AI Technical Summary

Problems solved by technology

Cylindrical forming mainly uses a method of rolling a rectangular steel plate into a cylinder and performing electric welding, but when DR material is used, cracks may occur in the steel plate near the welded part during flanging

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