STEEL SHEET, MEMBER, METHODS FOR MANUFACTURING SAME, METHOD FOR MANUFACTURING HOT-ROLLED STEEL SHEET FOR COLD-ROLLED STEEL SHEET, AND METHOD FOR MANUFACTURING COLD-ROLLED STEEL SHEET

Provided are a steel sheet having a tensile strength (TS) of 780 MPa or more and excellent in crashworthiness, a member, and methods for manufacturing the steel sheet and the member.A steel sheet has a chemical composition satisfying a carbon equivalent (CE) of 0.46% or more and a specific steel mic...

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Hauptverfasser:	NAKAGAITO Tatsuya, KOMINE Shinsuke
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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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creator	NAKAGAITO Tatsuya KOMINE Shinsuke
description	Provided are a steel sheet having a tensile strength (TS) of 780 MPa or more and excellent in crashworthiness, a member, and methods for manufacturing the steel sheet and the member.A steel sheet has a chemical composition satisfying a carbon equivalent (CE) of 0.46% or more and a specific steel microstructure. In the steel sheet, an average crystal grain size of ferrite is 25 um or less, coefficient of variation (CV) of ferrite grain size × carbon equivalent (CE) is 0.28 or less, when the steel sheet is bent by 90° in a rolling (L) direction with a width (C) direction as an axis at radius of curvature/sheet thickness: 4.2 and then unbent to be flattened again, the ratio (NFvoid/NF) of ferrite grains having a void at an interface to all ferrite grains is 15% or less in an L section in a region extending by 0 to 50 um from a steel sheet surface on a compressive-tensile deformation side, and a tensile strength is 780 MPa or more.
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In the steel sheet, an average crystal grain size of ferrite is 25 um or less, coefficient of variation (CV) of ferrite grain size × carbon equivalent (CE) is 0.28 or less, when the steel sheet is bent by 90° in a rolling (L) direction with a width (C) direction as an axis at radius of curvature/sheet thickness: 4.2 and then unbent to be flattened again, the ratio (NFvoid/NF) of ferrite grains having a void at an interface to all ferrite grains is 15% or less in an L section in a region extending by 0 to 50 um from a steel sheet surface on a compressive-tensile deformation side, and a tensile strength is 780 MPa or more.</description><language>eng ; fre ; ger</language><subject>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</subject><creationdate>2024</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20241120&DB=EPODOC&CC=EP&NR=4464801A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20241120&DB=EPODOC&CC=EP&NR=4464801A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>NAKAGAITO Tatsuya</creatorcontrib><creatorcontrib>KOMINE Shinsuke</creatorcontrib><title>STEEL SHEET, MEMBER, METHODS FOR MANUFACTURING SAME, METHOD FOR MANUFACTURING HOT-ROLLED STEEL SHEET FOR COLD-ROLLED STEEL SHEET, AND METHOD FOR MANUFACTURING COLD-ROLLED STEEL SHEET</title><description>Provided are a steel sheet having a tensile strength (TS) of 780 MPa or more and excellent in crashworthiness, a member, and methods for manufacturing the steel sheet and the member.A steel sheet has a chemical composition satisfying a carbon equivalent (CE) of 0.46% or more and a specific steel microstructure. 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In the steel sheet, an average crystal grain size of ferrite is 25 um or less, coefficient of variation (CV) of ferrite grain size × carbon equivalent (CE) is 0.28 or less, when the steel sheet is bent by 90° in a rolling (L) direction with a width (C) direction as an axis at radius of curvature/sheet thickness: 4.2 and then unbent to be flattened again, the ratio (NFvoid/NF) of ferrite grains having a void at an interface to all ferrite grains is 15% or less in an L section in a region extending by 0 to 50 um from a steel sheet surface on a compressive-tensile deformation side, and a tensile strength is 780 MPa or more.</abstract><oa>free_for_read</oa></addata></record>
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language	eng ; fre ; ger
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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
title	STEEL SHEET, MEMBER, METHODS FOR MANUFACTURING SAME, METHOD FOR MANUFACTURING HOT-ROLLED STEEL SHEET FOR COLD-ROLLED STEEL SHEET, AND METHOD FOR MANUFACTURING COLD-ROLLED STEEL SHEET
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