TH2101000970A - The patent has not yet been advertised. - Google Patents

Abstract

A summary of fabrication which appears on the advertisment page ReadFile:High-strength steel plate with a tensile strength of 1320 MPa or greater, where excellent bending and fatigue characteristics are possible and its manufacturing method. The high-strength steel plate of this fabrication has a unique composition and steel structure, where the total area ratio of martensite and benite at the 1/4 position, the plate thickness is 95% or more and 100% or less. In the remaining cases, other than where the aggregate area ratio is 100%, there will be residual altenite cross-section of the ferrite at the surface area to 10 µm in the direction of sheet thickness of 10% or more and 40 % or less, the tensile strength is 1320 MPa or greater, the Vickers hardness at the 15 µm position in the sheet thickness direction from the surface complies with formula (1) below Hv(greater than or equal to)0.294X( Sigma)...(1) Here, Hv is the Vickers hardness at 15 µm in the sheet thickness direction from the surface (sigma), indicating the tensile strength (megapascal).

Claims (1)

Claims (item one) which will appear on the advertisement page: 1.High-strength steel plate which contains C:0.13% or less and 0.40%,Si:0.01% or more and 1.0% or less,Mn:1.7% or less(not contain 0%). ,P:0.030% or less,S:0.010% or less,AI:0.20% or less(not contain 0%),N:0.010% or less with % by mass, the rest are Fe and foreign matter. The inevitable and the steel structure, which proportions the combined area of martensite and benite,