Steel sheet for bottom covers of aerosol cans and method for producing same

A steel sheet for a bottom cover of an aerosol can, the steel sheet consisting of, as a chemical composition,

• C:
• 0.025 to 0.065 mass %,
• Mn:
• 0.10 to 0.28 mass %,
• P:
• 0.005 to 0.03 mass %,
• Al:
• 0.01 to 0.04 mass %,
• N:
• 0.0075 to 0.010 mass %, wherein N comprises 0.004 mass % or more of solid soluted N,
• Si:
• limited to 0.05 mass % or less,
• S:
• limited to 0.009 mass % or less, and
• a balance consisting of Fe and unavoidable impurities,
• wherein:
• a yield point YP in a rolling direction after an aging treatment is in a range of 460 to 540 MPa,
• a total elongation in the rolling direction after the aging treatment is 15% or more,
• a yield point elongation ELyp in the rolling direction after the aging treatment is 6% or less,
• a sheet thickness t in a unit of mm, the yield point YP in a unit of MPa in the rolling direction after the aging treatment, and the yield point elongation ELyp in a unit of % in the rolling direction after the aging treatment satisfy a following (Formula 1):
• 130≦t×YP×(1−ELYP/100) (Formula 1), and
• in the aging treatment, the steel sheet is heated up to 210° C. at an average heating rate of 2±1° C/s, is held at an average temperature of 210±5° C. for 30 minutes, and is cooled to a room temperature by a natural cooling.