Patent ID: 11926881
Assignee: JFE STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 10:
11. A method for manufacturing the high-strength cold-rolled steel sheet according to claim 3, the method comprising:
a hot rolling step of subjecting a steel material having the chemical composition to hot rolling to obtain a hot-rolled steel sheet;
a pickling step of subjecting the hot-rolled steel sheet to pickling;
cold rolling step of subjecting the pickled hot-rolled steel sheet to cold rolling to obtain a cold-rolled steel sheet;
an annealing step of annealing the cold-rolled steel sheet at an annealing temperature in a range of 950 to 1200° C.; and
a cooling step of starting cooling from the annealing temperature, the cooling being performed at an average cooling rate of 15° C./s or higher in a temperature range of from Ar3 temperature or higher to Ms temperature or lower.