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1. WO2020110795 - HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Publication Number WO/2020/110795
Publication Date 04.06.2020
International Application No. PCT/JP2019/045019
International Filing Date 18.11.2019
IPC
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
C22C 38/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/12 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium or niobium
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
CPC
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/12
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium, or niobium
C22C 38/60
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
Applicants
  • JFEスチール株式会社 JFE STEEL CORPORATION [JP]/[JP]
Inventors
  • 戸畑 潤也 TOBATA Junya
  • 南 秀和 MINAMI Hidekazu
  • 小林 崇 KOBAYASHI Takashi
Agents
  • 熊坂 晃 KUMASAKA Akira
  • 森 和弘 MORI Kazuhiro
  • 磯村 哲朗 ISOMURA Tetsuo
  • 坂井 哲也 SAKAI Tetsuya
Priority Data
2018-22417029.11.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
(FR) TÔLE EN ACIER À HAUTE RÉSISTANCE ET PROCÉDÉ DE FABRICATION DE CELLE-CI
(JA) 高強度鋼板およびその製造方法
Abstract
(EN)
The purpose is to provide: a high-strength steel sheet having excellent strength-ductility balance and excellent material stability; and a method for manufacturing the high-strength steel sheet. A high-strength steel sheet in which the content of a specific steel composition is limited, and for which the production conditions are optimized, and which has a steel structure comprising ferrite and a hard phase, wherein the area ratio of the ferrite is 30 to 70% inclusive, the hard phase contains bainitic ferrite, tempered martensite, martensite (including 0%) and retained austenite (including 0%), the largest particle diameter dmax of the ferrite is 2.5 μm or less, and the ratio of the ferrite area ratio AF to the ferrite average particle diameter dF satisfies the following formula: AF [%]/dF [μm] ≧ 15.
(FR)
L'invention a pour objet de réaliser : une tôle en acier à haute résistance ayant un excellent équilibre de résistance-ductilité et une excellente stabilité de matériau ; et un procédé de fabrication de la tôle en acier à haute résistance. Une tôle en acier à haute résistance dans laquelle la teneur en une composition d'acier spécifique est limitée, et pour laquelle les conditions de production sont optimisées, et qui présente une structure d'acier comprenant de la ferrite et une phase dure, le rapport de surface de la ferrite allant de 30 à 70 % inclus, la phase dure contenant de la ferrite bainitique, de la martensite trempée, de la martensite (y compris 0 %) et de l'austénite résiduelle (y compris 0 %), le plus grand diamètre de particule dmax de la ferrite étant inférieur ou égal à 2,5 µm et le rapport entre le rapport de surface de ferrite AF et le diamètre moyen des particules de ferrite dF satisfait à la formule suivante : AF [%]/dF [μm] ≧ 15.
(JA)
強度延性バランスおよび材質安定性に優れる高強度鋼板およびその製造方法を提供することを目的とする。 特定の鋼組成の含有量を限定、かつ製造条件を最適化した、フェライトと硬質相からなり、フェライトが面積率で30%以上70%以下、硬質相はベイニティックフェライト、焼戻しマルテンサイト、マルテンサイト(0%を含む)および残留オーステナイト(0%を含む)を含み、フェライトの最大粒径dmaxが2.5μm以下であり、フェライトの面積率Aとフェライト平均粒径dがA[%]/d[μm]≧15である鋼組織を有する高強度鋼板。
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