CA2687327A1 - Acier a faible densite presentant une bonne aptitude a l'emboutissage - Google Patents

Acier a faible densite presentant une bonne aptitude a l'emboutissage Download PDF

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CA2687327A1
CA2687327A1 CA002687327A CA2687327A CA2687327A1 CA 2687327 A1 CA2687327 A1 CA 2687327A1 CA 002687327 A CA002687327 A CA 002687327A CA 2687327 A CA2687327 A CA 2687327A CA 2687327 A1 CA2687327 A1 CA 2687327A1
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sheet
rolled
steel sheet
cold
temperature
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CA2687327C (fr
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Astrid Perlade
Xavier Garat
Jean-Louis Uriarte
Olivier Bouaziz
Josee Drillet
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ArcelorMittal France SA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving particular fabrication steps or treatments of ingots or slabs
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving particular fabrication steps or treatments of ingots or slabs
    • C21D8/0215—Rapid solidification; Thin strip casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/041—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing involving a particular fabrication or treatment of ingot or slab
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/041—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing involving a particular fabrication or treatment of ingot or slab
    • C21D8/0415—Rapid solidification; Thin strip casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Body Structure For Vehicles (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne une tôle ferritique laminée à chaud en acier dont la composition comprend, les teneurs étant exprimées en poids : 0,001< C &l t;=0,15%, Mn <= 1 %, Si < 1,5%, 6% <=AI < 10%, 0,020% < Ti &l t; 0,5%, S < 0,050%, P < 0, 1 %, et, à titre optionnel, un ou plusieur s éléments choisis parmi : Cr < 1 %, Mo < 1 %, Ni < 1%, Nb < 0,1 %, V <= 0,2%,, B <= 0,010%, le reste de la composition étant constitu é de fer et d'impuretés inévitables résultant de l'élaboration, la taille mo yenne de grain de ferrite dIVmesurée sur une surface perpendiculaire à la di rection transverse par rapport au laminage étant inférieure à 100 micromètre s

Claims (4)

1 Tôle ferritique laminée à chaud en acier dont la composition comprend, les teneurs étant exprimées en poids :
0,001<= C <=0,15%
Mn <= 1 %
Si < 1,5%
6% <=Al <= 10%
0,020% <= Ti <= 0,5%
S <= 0,050%
P <= 0, 1%
et, à titre optionnel, un ou plusieurs éléments choisis parmi :
Cr <= 1%
Mo <= 1%
Ni <= 1%
Nb <= 0,1%
V <= 0,2%, B <= 0,010%
le reste de la composition étant constitué de fer et d'impuretés inévitables résultant de l'élaboration, la taille moyenne de grain de ferrite d IV mesurée sur une surface perpendiculaire à la direction transverse par rapport au laminage étant inférieure à 100 micromètres, ladite tôle comprenant une précipitation de précipités kappa et de carbures TiC
2 Tôle ferritique laminée à froid et recuite en acier de composition selon la revendication 1, caractérisée en ce que sa structure est constituée de ferrite équiaxe dont la taille moyenne de grain d a est inférieure à 50 micromètres, et en ce que la fraction linéaire f de précipités K
intergranulaires est inférieure à 30%, ladite fraction linéaire f étant définie par , ~di désignant la longueur totale des joints de grains comportant des précipités K relativement à une surface (S) considérée, ~Li désignant la longueur totale des joints de grains relativement à ladite surface (S) considérée
3 Tôle en acier selon la revendication 1 ou 2, caractérisée en ce que sa composition comprend, les teneurs étant exprimées en poids 0,001 % <= C <= 0,010%
Mn <= 0,2%
4 Tôle en acier selon la revendication 1 ou 2, caractérisée en ce que sa composition comprend, les teneurs étant exprimées en poids 0,010 % < C <= 0, 15%
0,2% < Mn <= 1%

Tôle en acier selon l'une quelconque des revendications 1 à 4, caractérisée en ce que sa composition comprend, les teneurs étant exprimées en poids :
7,5 % <=Al <= 10%

6 Tôle en acier selon l'une quelconque des revendications 1 à 4, caractérisée en ce que sa composition comprend, les teneurs étant exprimées en poids :
7,5% <=Al <= 8,5%

7 Tôle en acier selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la teneur en carbone en solution solide est inférieure à
0,005% en poids 8 Tôle en acier selon l'une quelconque des revendications 1 à 7, caractérisée en ce que sa résistance R m est supérieure ou égale à 400MPa 9 Tôle en acier selon la revendication 4, caractérisée en ce que sa résistance R m est supérieure ou égale'à 600MPa Procédé de fabrication d'une tôle d'acier laminée à chaud selon lequel :
- On approvisionne un acier de composition selon l'une quelconque des revendications 1 à 6 - On coule ledit acier sous forme de demi-produit, puis - On porte ledit demi-produit à une température supérieure ou égale à
1150°C, puis - On lamine à chaud ledit demi-produit pour obtenir une tôle, grâce â au moins deux étapes de laminage effectuées à des températures supérieures à 1050°C, le taux de réduction de chacune desdites au moins deux étapes étant supérieur ou égal à 30%, le temps s'écoulant entre chacune desdites au moins deux étapes de laminage, et l'étape de laminage suivante, étant supérieur ou égal é 10 s, puis - on achève le laminage à une température T FL supérieure ou égale à
900°C, puis - on refroidit ladite tôle de telle sorte que l'intervalle de temps t p s'écoulant entre 850 et 700°C soit supérieur à 3 s, pour obtenir une précipitation de précipités K, puis - on bobine ladite tôle à une température T bob comprise entre 500 et 700°C

11 Procédé de fabrication d'une tôle laminée à chaud selon la revendication 10, caractérisé en ce que ladite coulée est effectuée directement sous forme de coulée de brames minces ou de bandes minces entre cylindres contra-rotatifs 12 Procédé de fabrication d'une tôle en acier laminée à froid et recuite selon lequel :

- On approvisionne une tôle d'acier laminée à chaud fabriquée selon la revendication 10 ou 11, puis - On lamine à froid ladite tôle avec un taux de réduction compris entre 30 et 90%, de façon à obtenir une tôle laminée à froid, puis - On chauffe ladite tôle laminée à froid à une température T' avec une vitesse V c supérieure à 3°C/s, puis -[]n refroidit ladite tôle à une vitesse V R inférieure à 100°C/s - ladite température T' et ladite vitesse V R étant choisies de façon à
obtenir une recristallisation complète, une fraction linéaire f de précipités K intergranulaires inférieure à 30% et une teneur en carbone en solution solide inférieure à 0,005% en poids 13 Procédé de fabrication selon la revendication 12, caractérisé en ce qu'on chauffe ladite tôle laminée à froid à une température T' comprise entre 750 et 950°C

14 Procédé de fabrication selon la revendication 12, caractérisé en ce qu'on approvisionne une tôle de composition selon la revendication 4 et en ce qu'on chauffe ladite tôle laminée à froid à une température T' choisie de façon à éviter la dissolution de précipités K

15 procédé de fabrication selon la revendication 12, caractérisé en ce qu'on approvisionne une tôle de composition selon la revendication 4 et en ce qu'on chauffe ladite tôle laminée à froid à une température T' comprise entre 750 et 800°C

16 Utilisation de tôles d'acier selon l'une quelconque des revendications 1 à 9, ou fabriquées selon l'une quelconque des revendications 10 à 15 pour la fabrication de pièces de peau ou de pièces structurales dans le domaine automobile
CA2687327A 2007-05-16 2008-04-29 Acier a faible densite presentant une bonne aptitude a l'emboutissage Active CA2687327C (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07290624A EP1995336A1 (fr) 2007-05-16 2007-05-16 Acier à faible densité présentant une bonne aptitude à l'emboutissage
EP07290624.1 2007-05-16
PCT/FR2008/000610 WO2008145872A1 (fr) 2007-05-16 2008-04-29 Acier a faible densite presentant une bonne aptitude a l'emboutissage

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Publication Number Publication Date
CA2687327A1 true CA2687327A1 (fr) 2008-12-04
CA2687327C CA2687327C (fr) 2012-06-26

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US (2) US9580766B2 (fr)
EP (2) EP1995336A1 (fr)
JP (2) JP5552045B2 (fr)
KR (2) KR20140129365A (fr)
CN (1) CN101755057B (fr)
AR (1) AR066569A1 (fr)
AT (1) ATE490348T1 (fr)
BR (1) BRPI0811610A2 (fr)
CA (1) CA2687327C (fr)
DE (1) DE602008003801D1 (fr)
ES (1) ES2356186T5 (fr)
MA (1) MA31363B1 (fr)
MX (1) MX2009012221A (fr)
PL (1) PL2155916T5 (fr)
RU (1) RU2436849C2 (fr)
UA (1) UA99827C2 (fr)
WO (1) WO2008145872A1 (fr)
ZA (1) ZA200907619B (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2406404B1 (fr) * 2009-03-11 2017-08-23 Salzgitter Flachstahl GmbH Procédé de production d'un feuillard à chaud par coulée horizontale à partir d'acier ferritique
JP5257239B2 (ja) * 2009-05-22 2013-08-07 新日鐵住金株式会社 延性、加工性及び靭性に優れた高強度低比重鋼板及びその製造方法
CN104126023B (zh) * 2012-02-20 2017-02-22 塔塔钢铁荷兰科技有限责任公司 高强度可烘烤硬化的低密度钢及所述钢的制备方法
EP2836615B1 (fr) * 2012-04-11 2016-04-06 Tata Steel Nederland Technology B.V. Acier haute résistance à faible densité sans interstitiel et procédé de production de cet acier
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US20170101694A1 (en) 2017-04-13
UA99827C2 (ru) 2012-10-10
WO2008145872A1 (fr) 2008-12-04
EP2155916B2 (fr) 2015-03-11
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CN101755057A (zh) 2010-06-23
CN101755057B (zh) 2012-03-28
MA31363B1 (fr) 2010-05-03
RU2436849C2 (ru) 2011-12-20
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DE602008003801D1 (de) 2011-01-13
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ATE490348T1 (de) 2010-12-15
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JP2014040668A (ja) 2014-03-06
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