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    • 4. 发明专利
    • High-strength steel sheet and a method of manufacturing the same
    • JP5309528B2
    • 2013-10-09
    • JP2007279046
    • 2007-10-26
    • 新日鐵住金株式会社
    • 宏太郎 林啓達 小嶋
    • C22C38/00C21D9/46C22C38/14C22C38/58
    • PROBLEM TO BE SOLVED: To provide a high-strength steel sheet which is preferably used as a material of various reinforcing members in an automotive body or of a sheet member in an automobile because of having a tensile strength of 780 MPa or higher and excellent bendability. SOLUTION: The high-strength steel sheet with the tensile strength of 780 MPa or higher has a chemical composition comprising 0.05 to 0.17% C, 2.0 to 3.0% Mn, 0.0005 to 0.01% B, 0.03% or less P, 0.01% or less S, 0.01% or less N, furthermore, both 0.005 to 0.5% Si and 0.01 to 0.1% sol.Al in a total amount of 0.5% or less, furthermore, one or two elements of Ti and Nb in such a range as to satisfy the expression of 0.05%≤[Ti]+[Nb]/2≤0.2%, and the balance Fe with impurities; has a steel structure which does not contain not-yet-recrystallized ferrite and contains ferrite and bainite with an average grain size of 3.5 μm or less; includes B so that the minimal value of B intensity in a position of 2 to 10 μm deep from the surface, which has been obtained by glow discharge atomic emission spectrochemical analysis using an argon sputtering technique, is 60% or less of B intensity in a position of 80 μm deep from the surface, which has been obtained by the glow discharge atomic emission spectrochemical analysis using the argon sputtering technique; and has the tensile strength of 780 MPa or higher. The high-strength steel sheet is manufactured by continuously annealing the steel sheet after a cold rolling step, in such a condition as to lower a B concentration on the surface of the steel sheet. COPYRIGHT: (C)2009,JPO&INPIT