High-strength steel sheet and method for producing same
A technology of high-strength steel plates and manufacturing methods, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as meeting difficulties
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[0049] As a result of intensive research by the present inventors, in a steel having a predetermined composition, by making the steel structure (metal structure) as follows: ferrite fraction: 5% or less, tempered martensite and tempered bainite Total fraction of body: 60% or more, retained austenite content: 10% or more, average size of retained austenite: 1.0 μm or less, retained austenite with a size of 1.5 μm or more: 2 of the total amount of retained austenite % or more and the amount of dissolved nitrogen in the steel sheet: 0.002 mass % or less, the tensile strength (TS), the cross tensile strength of the welded part (SW cross tensile), the yield ratio (YR), the tensile strength can be obtained The product of (TS) and total elongation (EL) (TS×EL), LDR, and hole expansion ratio (λ) are all high-strength steel sheets at high levels.
[0050] 1. Steel structure and solution nitrogen content
[0051] Hereinafter, details of the steel structure and the amount of dissolved n...
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