Steel material, crankshaft, and automobile component

A steel material comprising, in terms of % by mass:

• C:
• 0.20% to 0.35%;
• Si:
• 0.01% to 0.35%;
• Mn:
• 0.55 to 1.50%;
• Cu:
• equal to or less than 0.60%;
• Ni:
• equal to or less than 0.30%;
• S:
• 0.01% to 0.15%;
• Cr:
• 0.01% to 0.20%;
• Mo:
• 0.01% to 0.05%;
• s-Al:
• equal to or less than 0.020%;
• Ti:
• equal to or less than 0.040%;
• N:
• 0.003% to 0.030%;
• Ca:
• 0.0003% to 0.0060%;
• and
• O:
• equal to or less than 0.010%,
• with the balance being Fe and unavoidable impurities,
• wherein Expression 1≧0.43 is satisfied in a case where Expression 1=[C]+0.07×[Si]+0.16×[Mn]+0.19×[Cu]+0.17×[Ni]+0.20×[Cr]+0.40×[Mo] is established,
• Expression 2≧0.38 is satisfied in a case where Expression 2=0.55×[C]+0.06×[Si]+0.18×[Mn]+0.09×[Cu]+0.47×[Mo]+[Cr] is established, and
• 1.77≦Expression 3≦3.20 is satisfied in a case where Expression 3=11×[Ca]/([N]+1.5×[O]) is established,
• in which each [ ] in Expressions 1 to 3 indicates a content of the element shown therein in terms of % by mass.