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1. WO2019208556 - STEEL MEMBER AND METHOD FOR PRODUCING SAME

Publication Number WO/2019/208556
Publication Date 31.10.2019
International Application No. PCT/JP2019/017177
International Filing Date 23.04.2019
IPC
C22C 38/14 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
14containing titanium or zirconium
C22C 38/60 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
60containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C21D 1/18 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
18Hardening; Quenching with or without subsequent tempering
C21D 9/00 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
C21D 9/46 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
CPC
C21D 1/18
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
18Hardening
C21D 2211/001
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
2211Microstructure comprising significant phases
001Austenite
C21D 9/00
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
C21D 9/46
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C22C 38/14
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
14containing titanium or zirconium
C22C 38/42
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 田畑 進一郎 TABATA Shinichiro
  • 諏訪 嘉宏 SUWA Yoshihiro
  • 匹田 和夫 HIKIDA Kazuo
  • 楠見 和久 KUSUMI Kazuhisa
Agents
  • 棚井 澄雄 TANAI Sumio
  • 寺本 光生 TERAMOTO Mitsuo
  • 勝俣 智夫 KATSUMATA Tomoo
  • 山口 洋 YAMAGUCHI Yoh
Priority Data
2018-08262523.04.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL MEMBER AND METHOD FOR PRODUCING SAME
(FR) ÉLÉMENT EN ACIER ET SON PROCÉDÉ DE PRODUCTION
(JA) 鋼部材およびその製造方法
Abstract
(EN)
A steel member according to one embodiment of the present invention has a specific chemical composition, while having a metal structure that contains, in volume %, 60.0-85.0% of martensite, 10.0-30.0% of bainite and 5.0-15.0% of residual austenite, with the balance structure accounting for 0-4.0%. The maximum breadth of the residual austenite is 30.0 nm or more. The number density of carbides having a circle-equivalent diameter of 0.1 μm or more and an aspect ratio of 2.5 or less in the steel member is 4.0 × 103 pieces/mm2 or less.
(FR)
Selon un mode de réalisation, la présente invention concerne un élément en acier comprenant une composition chimique spécifique, tout en comprenant une structure métallique qui contient, en % en volume, de 60,0 à 85,0 % de martensite, de 10,0 à 30,0 % de bainite et de 5,0 à 15,0 % d'austénite résiduelle, la structure de complément représentant de 0 à 4,0 %. La largeur maximale de l'austénite résiduelle est supérieure ou égale à 30,0 nm. La densité numérique de carbures comprenant un diamètre équivalent en cercle supérieur ou égal à 0,1 µm et un rapport d'aspect inférieur ou égal à 2,5 dans l'élément en acier est inférieure ou égale à 4,0 × 103 pièces/mm2.
(JA)
本発明の一態様に係る鋼部材は、所定の化学組成を有し、金属組織が、体積%で、マルテンサイトが60.0~85.0%、ベイナイトが10.0~30.0%、残留オーステナイトが5.0~15.0%および残部組織が0~4.0%である。前記残留オーステナイトの最大短径の長さは30nm以上である。前記鋼部材中に存在する円相当直径が0.1μm以上かつアスペクト比が2.5以下である炭化物の数密度が4.0×10個/mm以下である。
Also published as
EP2019792870
KR1020207032262
MXMX/a/2020/011082
TH2001006115
Latest bibliographic data on file with the International Bureau