STEEL SHEET, METHOD FOR MANUFACTURING SAME AND PLATED STEEL SHEET

This steel sheet has a predetermined chemical composition and the steel sheet in which, at a 1/4 depth position of a sheet thickness from a surface, an average grain size is 15.0 µm or less, a total grain boundary number density of solute C and solute B is 1.0 solute/nm2 or more and 12.0 solutes/nm2...

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Bibliographic Details
Main Authors YOSHIDA, Mitsuru, KOJIMA, Nobusato
Format Patent
LanguageEnglish
French
German
Published 09.02.2022
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:This steel sheet has a predetermined chemical composition and the steel sheet in which, at a 1/4 depth position of a sheet thickness from a surface, an average grain size is 15.0 µm or less, a total grain boundary number density of solute C and solute B is 1.0 solute/nm2 or more and 12.0 solutes/nm2 or less, a total of pole densities of {211} and {332} in a thickness middle portion is 12.0 or less, and a tensile strength is 780 MPa or more is adopted.
Bibliography:Application Number: EP20200777245