TH2001005724A - High-strength galvanized thin steel sheet, high-strength parts, and methods for producing the same. - Google Patents

Abstract

A summary of the fabrication which will appear on the advertisement page ReadFile:DEPCT64 for high-strengthgalvanized steelsheet related to hydrogen fragile. Galvanized high strength and high strength parts with the appearance of the coating and the material's excellent hydrogen brittle resistance and high yield ratio suitable for building materials and parts. Resistance to automobile crashes and methods for producing the same high-strength galvanized steel sheet of the current fabrication include sheet steel with a specific chemical composition and structural steel that, in terms of area ratio, is 4% or More than and 20% or less of residual austenite, 30% or less (including 0%) of ferrite, 40% or more of martensite and 10% or more and 50 % or less of binite; and a galvanizing layer is provided on the steel plate where the amount of diffuse hydrogen in the steel is less than 0.20 parts per million by mass, the tensile strength is 1100 MPa. or more, the relationship between the tensile strength T S(megapascal), elongation EI(%) and sheet thickness t(mm) correspond to formula (1) below, and the yield ratio YR is 67% or greater than TSx(EI+3). -2.5t) greater than or equal to 13000(1)--------------------------------------- --------------------

Claims (3)

Claims (item one) which will appear on the advertisement page:DEPCT64 1.High-strengthgalvanized steelsheet, consisting of: steel plate whose chemical composition in % by mass contains C:0.10% or more and 0.30% or less, Si:1.0. % or more and 2.8% or less Mn:2.0% or more and 3.5% or less, P:0.010% or less, S:0.001% or less, Al:1% or less, N:0.0001% or more, and 0.006% or less, and