Hot-stamped steel, method of producing of steel sheet for hot stamping, and method of producing hot-stamped steel

A method of producing a steel sheet for a hot-stamped steel, the method comprising:

• a first process in which a slab is heated to a temperature range of 1270° C. or lower;
• a second process in which a finish rolling is performed in a temperature range of 800° C. to 900° C. so that a total reduction from a third last stand to a last stand becomes 60% or more;
• a third process in which a cooling begins within 1 second from an end of the second process;
• and
• a fourth process in which a coiling is performed in a temperature of 600° C. or lower,
• the slab comprising:
• by mass %,
• C:
• 0.20% to 0.35%,
• Si:
• 0.1% to 0.5%,
• a total of at least one selected from Mn and Cr:
• 1% to 3%,
• Al:
• 0.005% to 0.06%,
• Ti:
• 0.002% to 0.1%,
• Nb:
• 0.002% to 0.1%,
• O:
• 0.003% to 0.007%, and
• a balance of iron and inevitable impurities, wherein
• P is limited to 0.015% or less,
• S is limited to 0.01% or less, and
• N is limited to 0.004% or less.