STEEL PLATE AND METHOD FOR MANUFACTURING STEEL PLATE

In a steel sheet according to the present embodiment, a Ti content and a N content satisfy Ti - 3.5 × N ≥ 0.003, at a sheet thickness 1/4 position, a metallographic structure includes 90% or more of martensite in terms of volume fraction, at the sheet thickness 1/4 position, a number density of TiC...

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Bibliographic Details
Main Authors IKEDA, Arisa, TAKEDA, Kengo
Format Patent
LanguageEnglish
French
German
Published 09.08.2023
Subjects
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:In a steel sheet according to the present embodiment, a Ti content and a N content satisfy Ti - 3.5 × N ≥ 0.003, at a sheet thickness 1/4 position, a metallographic structure includes 90% or more of martensite in terms of volume fraction, at the sheet thickness 1/4 position, a number density of TiC having a circle equivalent diameter of 1 to 500 nm is 3.5 × 104 particles/mm2 or more, at the sheet thickness 1/4 position, a value of a median value of a Mn concentration + 3σ is 5.00% or less, and a hardness measured at the sheet thickness 1/4 position is 1.30 times or more a hardness measured at a position 50 µm deep from a surface of the steel sheet.
Bibliography:Application Number: EP20210874939