Patent ID: 11939642
Assignee: JFE STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. A method for manufacturing the high-strength steel sheet according to claim 3, the method comprising annealing a cold-rolled steel sheet obtained by performing hot rolling, pickling, and cold rolling,
wherein the annealing includes:
heating under conditions that an average heating rate in a temperature range of 250° C. or higher and 700° C. or lower is 10° C./s or more, and a heating temperature is in a range of 850° C. or higher and 950° C. or lower, and
subsequently, cooling under conditions that a holding time in a temperature range of 50° C. or higher and 400° C. or lower is in a range of 70 s or more and 700 s or less, and an average cooling rate in a temperature range of 50° C. or higher and 250° C. or lower is 10.0° C./s or less.