METHOD FOR PRODUCING PRECIPITATION-STRENGTHENING TYPE HIGH STRENGTH STEEL SHEET, AND PRECIPITATION-STRENGTHENING TYPE HIGH STRENGTH STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method for designing a precipitation-strengthening type high strength steel sheet by which the steel design can efficiently and theoretically be performed, in the case of producing the precipitation strengthening type high strength steel sheet by compositely adding carbide-generating element, and a method for producing the precipitation-strengthening type high strength steel sheet and such precipitation-strengthening type high strength steel sheet.;SOLUTION: When the precipitation-strengthening type high strength steel sheet composed of the precipitation of the carbide in the steel structure is designed, as the metallic element constituting the carbide, one or more kinds of first metallic element M1 having 1.8 electronegativity and generating MC type carbide and one or more kinds of second metallic element M2 having ≥1.8 electronegativity, are selected so that the atomic radius difference between the first metallic element M1 and the second metallic element M2 becomes 10%, and the additional quantities of the first metallic element M1, the second metallic element M2 and C, are decided so as to generate the carbides containing the first metallic element M1 and the second metallic element M2.;COPYRIGHT: (C)2009,JPO&INPIT