STEEL SHEET FOR CANS, HOT-ROLLED STEEL SHEET TO BE USED AS THE BASE METAL AND PROCESSES FOR PRODUCTION OF BOTH

摘要

In producing a steel sheet for cans, a steel sheet which consists substantially of ferrite single-phase structure and has a mean grain diameter of 7µm or below and which exhibits a yield strength of 500MPa or above, a yield ratio of 0.9 or above, a total elongation of 10% or above, and ?r of -0.50 to 0 after coating and baking is produced by incorporating C: 0.01 to 0.12%, Si: 0.005 to 0.5%, Mn: 0.3 to 1.5%, P: 0.005 to 0.2%, Al: 0.10% or below, N: 0.012% or below, and Nb: 0.005 to 0.10% and combining solid solution hardening, precipitation hardening, and grain refinement hardening. The hot rolling is conducted principally under the conditions of FT of 870°C or above, cooling rate after hot rolling of 40°C/s or below, and CT of 620°C or above to adjust the mean grain size of a hot-rolled sheet serving as material for the steel sheet for cans to 6µm or above.