Patent ID: 11939640
Assignee: JFE STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 4:
5. A method for producing a steel sheet, comprising:
heating the cold-rolled full-hard steel sheet obtained by the method of claim 3, the cold-rolled full-hard steel sheet being heated under the conditions where the dew point in a temperature range of 600° C. or more is −40° C. or less, and a maximum achieving temperature is 730 to 880° C.;
retaining the heated cold-rolled full-hard steel sheet at the maximum achieving temperature for a retention time of 15 to 600 seconds; and
cooling the retained cold-rolled full-hard steel sheet to a cooling stop temperature at an average cooling rate of 2 to 30° C./s, the cooling stop temperature being 650° C. or less.