Patent ID: 8557065

Claim:
A high-strength, high-workability steel sheet for cans containing 0.070% to less than 0.080% C, 0.003% to 0.10% Si, 0.51% to 0.60% Mn, 0.001% to 0.100% P, 0.001% to 0.020%, 0.005% to 0.100% Al, and 0.010% or less N on a mass basis, the remainder being Fe and unavoidable impurities, the sheet having a tensile strength of 500 MPa or more and a yield elongation of 10% or more, wherein the average size and elongation rate of crystal grains are 5 μm or more and 2.0 or less, respectively, in cross section in the rolling direction thereof; the hardness difference obtained by subtracting the average Vickers hardness of a cross section ranging from a surface to a depth equal to one-eighth of the thickness of the sheet from the average Vickers hardness of a cross section ranging from a depth equal to three-eighths of the sheet thickness to a depth equal to four-eighths of the sheet thickness is 10 points or more; and/or the hardness difference obtained by subtracting the maximum Vickers hardness of the cross section ranging from the surface to a depth equal to one-eighth of the sheet thickness from the maximum Vickers hardness of the cross section ranging from a depth equal to three-eighths of the sheet thickness to a depth equal to four-eighths of the sheet thickness is 20 points or more.