Hot Rolled Steel Sheet

Abstract: This hot-rolled steel sheet has a specific chemical composition; the metal structure of this hot-rolled steel sheet at a position where the depth from the surface is 1/4 in the sheet thickness direction comprises, in area%, less than 3.0% of residual austenite, not less than 15.0% but less than 60.0% of ferrite and less than 5.0% of pearlite, while having an E value of 10.7 or more, an I value of 1.020 or more, a CS value of -8.0 × 105 to 8.0 × 105, and a standard deviation of the Mn concentration of 0.60% by mass or less; and, in the surface, the number density of Si-Al-Cr oxides having a sphere equivalent radius of 0.500 µm or more is 2.0 × 103 per cm2 or less, and the number density of Si-Al-Cr oxides having a sphere equivalent radius of 0.005 µm to 0.050 µm is 1.0 × 105 per cm2 or more.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents