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1. WO2019188640 - HIGH-STRENGTH SHEET STEEL AND METHOD FOR MANUFACTURING SAME

Publication Number WO/2019/188640
Publication Date 03.10.2019
International Application No. PCT/JP2019/011645
International Filing Date 20.03.2019
IPC
C22C 38/06 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
06containing aluminium
C22C 38/60 2006.1
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 8/02 2006.1
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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
C21D 9/46 2006.1
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
C23C 2/02 2006.1
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
2Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
02Pretreatment of the material to be coated, e.g. for coating on selected surface areas
CPC
B21B 27/106
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
27Rolls, ; roll alloys or roll fabrication
06Lubricating, cooling or heating rolls
10externally
106Heating the rolls
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 2211/005
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
005Ferrite
C21D 2211/008
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
008Martensite
C21D 6/005
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
6Heat treatment of ferrous alloys
005containing Mn
C21D 6/008
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
6Heat treatment of ferrous alloys
008containing Si
Applicants
  • JFEスチール株式会社 JFE STEEL CORPORATION [JP]/[JP]
Inventors
  • 遠藤 一輝 ENDO, Kazuki
  • 川崎 由康 KAWASAKI, Yoshiyasu
  • 田路 勇樹 TOJI, Yuki
  • 船川 義正 FUNAKAWA, Yoshimasa
  • 青山 麻衣 AOYAMA, Mai
Agents
  • 特許業務法人酒井国際特許事務所 SAKAI INTERNATIONAL PATENT OFFICE
Priority Data
2018-06671530.03.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) HIGH-STRENGTH SHEET STEEL AND METHOD FOR MANUFACTURING SAME
(FR) TÔLE D'ACIER À RÉSISTANCE ÉLEVÉE ET PROCÉDÉ DE FABRICATION DE LADITE TÔLE D'ACIER
(JA) 高強度鋼板およびその製造方法
Abstract
(EN)
This high-strength sheet steel is characterized in that: the steel structure comprises, in terms of areal proportions, 35-80% ferrite, 5-35% martensite, and 0-5% tempered martensite, and at least 8% retained austenite in terms of volumetric proportion; further, the average ferrite crystal particle size is 6 μm or less, the average retained austenite crystal particle size is 3 μm or less, and the value of the areal proportion of blocky austenite divided by the total areal proportion of lath austenite and blocky austenite is at least 0.6; the value of the average Mn content of the retained austenite divided by the average Mn content of the ferrite is at least 1.5; and the value of the average C content of the retained austenite divided by the average C content of the ferrite is at least 3.0.
(FR)
L'invention concerne une tôle d'acier à résistance élevée, qui est caractérisée en ce que : la structure d'acier comprend, en termes de proportions surfaciques, de 35 à 80 % de ferrite, de 5 à 35 % de martensite et de 0 à 5 % de martensite revenue, et au moins 8 % d'austénite résiduelle en termes de proportion volumétrique ; en outre, la taille moyenne des particules de cristal de ferrite est de 6 µm ou moins, la taille moyenne des particules de cristal d'austénite résiduelle est de 3 µm ou moins, et la valeur de la proportion surfacique d'austénite en bloc divisée par la proportion surfacique totale d'austénite en lattes et d'austénite en bloc est d'au moins 0,6 ; la valeur de la teneur moyenne en Mn de l'austénite résiduelle divisée par la teneur moyenne en Mn de la ferrite est d'au moins 1,5 ; et la valeur de la teneur moyenne en C de l'austénite résiduelle divisée par la teneur moyenne en C de la ferrite est d'au moins 3,0.
(JA)
本発明に係る高強度鋼板は、鋼組織は、面積率で、フェライトが35%以上80%以下、マルテンサイトが5%以上35%以下であり、焼戻しマルテンサイトが0%以上5%以下であり、体積率で残留オーステナイトが8%以上であり、さらに、フェライトの平均結晶粒径が6μm以下、残留オーステナイトの平均結晶粒径が3μm以下であり、かつ塊状オーステナイトの面積率をラス状オーステナイトと塊状オーステナイトの面積率の和で除した値が0.6以上であり、残留オーステナイト中のMnの平均含有量をフェライト中のMnの平均含有量で除した値が1.5以上であり、かつ残留オーステナイト中のCの平均含有量をフェライト中のCの平均含有量で除した値が3.0以上であることを特徴とする。
Also published as
MXMX/a/2020/010211
TH2001005668
Latest bibliographic data on file with the International Bureau