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1. WO2011004779 - HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Publication Number WO/2011/004779
Publication Date 13.01.2011
International Application No. PCT/JP2010/061363
International Filing Date 29.06.2010
IPC
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
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 38/14 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 38/38 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
38with more than 1.5% by weight of manganese
CPC
C21D 2211/004
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
2211Microstructure comprising significant phases
004Dispersions; Precipitations
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
005Ferrite
C21D 8/0226
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
0221characterised by the working steps
0226Hot rolling
C21D 8/0273
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
0247characterised by the heat treatment
0273Final recrystallisation annealing
C22C 38/02
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
02containing silicon
C22C 38/04
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
Applicants
  • JFEスチール株式会社 JFE STEEL CORPORATION [JP]/[JP] (AllExceptUS)
  • 中川功一 NAKAGAWA, Koichi [JP]/[JP] (UsOnly)
  • 横田毅 YOKOTA, Takeshi [JP]/[JP] (UsOnly)
  • 瀬戸一洋 SETO, Kazuhiro [JP]/[JP] (UsOnly)
  • 城代哲史 KINOSHIRO, Satoshi [JP]/[JP] (UsOnly)
  • 田中裕二 TANAKA, Yuji [JP]/[JP] (UsOnly)
  • 山田克美 YAMADA, Katsumi [JP]/[JP] (UsOnly)
  • 妻鹿哲也 MEGA, Tetsuya [JP]/[JP] (UsOnly)
  • 中島勝己 NAKAJIMA, Katsumi [JP]/[JP] (UsOnly)
Inventors
  • 中川功一 NAKAGAWA, Koichi
  • 横田毅 YOKOTA, Takeshi
  • 瀬戸一洋 SETO, Kazuhiro
  • 城代哲史 KINOSHIRO, Satoshi
  • 田中裕二 TANAKA, Yuji
  • 山田克美 YAMADA, Katsumi
  • 妻鹿哲也 MEGA, Tetsuya
  • 中島勝己 NAKAJIMA, Katsumi
Agents
  • 落合憲一郎 OCHIAI, Kenichiro
Priority Data
2009-16330910.07.2009JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
(FR) TÔLE D'ACIER À HAUTE RÉSISTANCE ET PROCÉDÉ DE FABRICATION ASSOCIÉ
(JA) 高強度鋼板およびその製造方法
Abstract
(EN)
Provided are a high-strength steel sheet with superior post-processing stretch flange characteristics and a manufacturing method therefor. The composition thereof comprises, in mass%, a range from 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, up to 0.04% of phosphorus, up to 0.005% of sulfur, up to 0.05% of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, with the remainder comprising iron and unavoidable impurities. Additionally, the structure is from 80% to 98% a ferrite phase and a second phase by volume. Furthermore, the total amount of titanium and vanadium comprised in deposits with a size of less than 20nm is more than 0.150 mass%. The difference (HVα-HVS) between the hardness (HVα) of the aforementioned ferrite phase and the hardness (HVS) of a bainite phase is in the range of -300 to 300.
(FR)
L'invention concerne une tôle d'acier à haute résistance qui présente des caractéristiques supérieures de bord tombé post-traitement, et un procédé de fabrication associé. Ladite tôle d'acier se compose, en % en masse, de 0,08 % à 0,20 % de carbone, de 0,2 % à 1 % de silicium, de 0,5 % à 2,5 % de manganèse, jusqu'à 0,04 % de phosphore, jusqu'à 0,005 % de soufre, jusqu'à 0,05 % d'aluminium, de 0,07 % à 0,20 % de titane, et de 0,20 % à 0,80 % de vanadium, le reste comprenant du fer et des impuretés inévitables. En outre, la structure est composée de 80 % à 98 % d'une phase de ferrite et d'une seconde phase en volume. De plus, la quantité totale de titane et de vanadium comprise dans les dépôts ayant une taille inférieure à 20 nm est supérieure à 0,15 % en masse. La différence (HVα-HVS) entre la dureté (HVα) de la phase de ferrite susmentionnée et la dureté (HVS) d'une phase de bainite est de l'ordre de -300 à 300.
(JA)
加工後の伸びフランジ特性に優れた高強度鋼板およびその製造方法を提供する。成分組成は、mass%で、C:0.08%以上0.20%以下、Si:0.2%以上1.0%以下、Mn:0.5%以上2.5%以下、P:0.04%以下、S:0.005%以下、Al:0.05%以下、Ti:0.07%以上0.20%以下、V:0.20%以上0.80%以下を含有し、残部がFeおよび不可避的不純物からなる。そして、組織は体積占有率で80%以上98%以下のフェライト相と第二相である。さらに、大きさが20nm未満の析出物に含まれるTiとVの合計量は0.150mass%以上である。前記フェライト相の硬度(HVα)と前記ベイナイト相の硬度(HVS)の差(HVα-HVS)は、-300以上300以下である。
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