Patent ID: 9315877
Filing Date: 2016-04-19
CPC Classification: B65D,C21D,C22C

Claim Text:
1. 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 EL 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 EL 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.