High-strength hot-rolled steel sheet and method for producing same

2013 
The present invention addresses the problem of providing: a high-strength hot-rolled steel sheet which has excellent strength and excellent processability (in particular, bending processability) at the same time; and a method for producing the high-strength hot-rolled steel sheet. In order to solve the above-mentioned problem, the present invention is characterized by: having a specific composition; having an area ratio of a ferrite phase of 95% or more; having an average crystal grain diameter of the ferrite phase of 8 mum or less; having a structure wherein the average particle diameter of carbides within the crystal grains of the ferrite phase is less than 10 nm; and having a tensile strength of 980 MPa or more.
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