| abstract |
This hot-rolled steel sheet contains, by mass%, C: 0.030% or more and less than 0.075%, Si+Al: 0.08% to 0.40%, Mn: 0.5% to 2.0%, Ti: 0.020% to 0.150%, and ferrite and martense It has a metal structure containing a site, and in the metal structure, in area%, ferrite is 90% to 98%, martensite is 2% to 10%, bainite is 0% to 3%, pearlite is 0% to 3 %, and in the martensite, the number ratio of martensite particles having a hardness of 10.0 GPa or more is 10% or less, and a hardness of 8.0 GPa or more and less than 10.0 GPa to the number N2 of martensite particles having a hardness of less than 8.0 GPa The ratio of the number of martensite particles N1, N1/N2, is 0.8 to 1.2. |