| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength hot rolled steel sheet excellent in material quality stability and weldability and a manufacturing method therefor.SOLUTION: There is provided a high strength hot rolled steel sheet excellent in material quality stability and weldability and having tensile strength of 980 MPa or more having a composition containing, by mass%, C:0.09% to 0.17%, Si:over 1.0% to 1.6%, Mn:1.5% to 2.5%, P:0.03% or less, S:0.005% or less, Al:0.08% or less, N:0.0080% or less, Ti:0.09% to 0.14% and V:0.05% to 0.25% with limiting contents of Cr, Ni nd Mo each to 0.06% or less including 0%, and the balance Fe with inevitable impurities, and a structure having an area percentage of a bainite phase of 80% or more and Fe deposition amount of 0.50% or less. |
