Steel plates for canned food and their manufacturing methods

Abstract

This invention provides steel plates for canning and a method for manufacturing the same. The steel plates possess the necessary corrosion resistance for canning, as well as excellent ductility, edge-rolling ability, and can pressure resistance. The steel plates for canning contain, by weight %: 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 0.0040%, Ti: 0.005% to 0.030%, Nb: 0.005% to 0.030%, Mo: 0.01% to 0.0%. The metal microstructure has the following composition: less than 5% of B, more than 0.0005% and less than 0.0050% of Cu, less than 0.080% of Cr, and the remainder consists of iron and unavoidable impurities. The content of N as solid solution N among the aforementioned N is less than 0.0025% by mass. The microstructure contains a ferrite phase with an area ratio of more than 90%, and the ratio of non-recrystallized ferrite to the area ratio of the whole microstructure is less than 3%. The yield strength is more than 450 MPa and the total elongation is more than 15%.

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