Patent ID: 11939650
Assignee: NIPPON STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A hot-rolled steel sheet comprising: a chemical composition consisting of, by mass %,
0.030 to 0.400% of C;
0.050 to 2.5% of Si;
1.00 to 4.00% of Mn;
0.001 to 2.0% of sol.Al;
0 to 0.20% of Ti;
0 to 0.20% of Nb;
0 to 0.010% of B;
0 to 1.0% of V;
0 to 1.0% of Cr;
0 to 1.0% of Mo;
0 to 1.0% of Cu;
0 to 1.0% of Co;
0 to 1.0% of W;
0 to 1.0% of Ni;
0 to 0.01% of Ca;
0 to 0.01% of Mg;
0 to 0.01% of REM;
0 to 0.01% of Zr;
limited to 0.020% or less of P;
limited to 0.020% or less of S;
limited to 0.010% or less of N; and
a balance of Fe and impurities, and
wherein, when a surface region is from a sheet surface to 1/10 of a sheet thickness, an average of pole densities in a crystal orientation group consisting of {110}<110>to {110}<001>in the surface region is 0.5 to 3.0, and a standard deviation of the pole densities in the crystal orientation group is 0.2 to 2.0, and
wherein a tensile strength is 780 to 1370 MPa.