Steel plates for canned food and their manufacturing methods

Abstract

This invention provides steel plates for canning and a method for manufacturing the same, which possess the necessary corrosion resistance for canning and have machinability of the rolled-up portion and pressure resistance of the can lid. The steel plates for canning contain, by weight percent: C: 0.05% to 0.13%, Si: 0.01% to 0.04%, Mn: 0.1% to 0.6%, P: 0.02%, S: 0.02%, Al: 0.01% to 0.10%, N: 0.0005% to 0.0080%, Ti: 0.005% to 0.030%, Nb: 0.005% to 0.030%, Mo: 0.010% to 0.050%, B: 0.0005% to 0.0050%, Cu: 0.003% to 0.500%, Cr: 0.0 The composition consists of iron and unavoidable impurities, with the following Mo content being 0.013% by mass or less, and having a ferrite phase with an area ratio of 70% or more and an asphaltene phase with an area ratio of 5% or more and 22% or less. The remaining part of the Mo content as deposited Mo is 0.013% by mass or less. The metal structure has a yield strength YS (MPa) and tensile strength TS (MPa) satisfying the following relationship (1), and a total elongation of 10% or more.

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