Steel sheet

1. A steel sheet, comprising:

a chemical composition represented by, in mass %,

C: 0.05% to 0.1%,

P: 0.04% or less,

S: 0.01% or less,

N: 0.01% or less,

O: 0.006% or less,

Si and Al: 0.20% to 2.50% in total,

Mn and Cr: 1.0% to 3.0% in total,

Mo: 0.00% to 1.00%,

Ni: 0.00% to 1.00%,

Cu: 0.00% to 1.00%,

Nb: 0.000% to 0.30%,

Ti: 0.000% to 0.30%,

V: 0.000% to 0.50%,

B: 0.0000% to 0.01%,

Ca: 0.0000% to 0.04%,

Mg: 0.0000% to 0.04%,

REM: 0.0000% to 0.04%, and

the balance: Fe and impurities; and

a metal structure represented by, in area fraction,

ferrite: 50% to 95%,

granular bainite: 5% to 48%,

tempered martensite: 2% to 30%,

upper bainite, lower bainite, fresh martensite, retained austenite, and pearlite: 5% or less in total, and

the product of the area fraction of the tempered martensite and a Vickers hardness of the tempered martensite: 800 to 10500.

2. The steel sheet according to claim 1 , wherein

in the chemical composition, in mass %,

Mo: 0.01% to 1.00%,

Ni: 0.05% to 1.00%, or

Cu: 0.05% to 1.00%,

or an arbitrary combination of the above is established.

3. The steel sheet according to claim 1 , wherein

in the chemical composition, in mass %,

Nb: 0.005% to 0.30%,

Ti: 0.005% to 0.30%, or

V: 0.005% to 0.50%,

or an arbitrary combination of the above is established.

4. The steel sheet according to claim 1 , wherein

in the chemical composition, in mass %,

B: 0.0001% to 0.01% is established.

5. The steel sheet according to claim 1 , wherein

in the chemical composition, in mass %,

Ca: 0.0005% to 0.04%,

Mg: 0.0005% to 0.04%, or

REM: 0.0005% to 0.04%,

or an arbitrary combination of the above is established.

6. The steel sheet according to claim 1 , further comprising:

a hot-dip galvanizing layer on a surface thereof.

7. The steel sheet according to claim 1 , further comprising:

an alloyed hot-dip galvanizing layer on a surface thereof.

8. The steel sheet according to claim 1 , wherein a tensile strength is 590 MPa or more.