Steel sheet and method of manufacturing the same

A steel sheet comprising, as a chemical composition, by mass %:

• C:
• 0.030% to 0.180%;
• Si:
• 0.030% to 1.400%;
• Mn:
• 1.60% to 3.00%;
• Al:
• 0.010% to 0.700%;
• P:
• 0.0800% or less;
• S:
• 0.0100% or less;
• N:
• 0.0050% or less;
• Ti:
• 0.020% to 0.180%;
• Nb:
• 0.010% to 0.050%;
• Mo:
• 0% to 0.600%;
• V:
• 0% to 0.300%;
• a sum of Ti, Nb, Mo, and V:
• 0.100% to 1.130%;
• B:
• 0% to 0.0030%;
• Cr:
• 0% to 0.500%;
• and
• a remainder consisting of Fe and impurities,
• wherein a microstructure of the steel sheet contains, by area %,
• bainite:
• 80.0% or more,
• a sum of fresh martensite and tempered martensite:
• 20.0% or less, and
• a sum of pearlite, ferrite, and austenite:
• 20.0% or less,
• a number density of alloy carbides present at grain boundaries and having a major axis of 10 to 100 nm is 1.0×108 to 1.0×1011/cm2,
• a number density of alloy carbides present in grains and having a major axis of 10 nm or less is 1.0×1016 to 1.0×109/cm3, and
• a tensile strength of the steel sheet is 1,030 MPa or more.