EP1995336A1 - Acier à faible densité présentant une bonne aptitude à l'emboutissage - Google Patents

Acier à faible densité présentant une bonne aptitude à l'emboutissage Download PDF

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Publication number
EP1995336A1
EP1995336A1 EP07290624A EP07290624A EP1995336A1 EP 1995336 A1 EP1995336 A1 EP 1995336A1 EP 07290624 A EP07290624 A EP 07290624A EP 07290624 A EP07290624 A EP 07290624A EP 1995336 A1 EP1995336 A1 EP 1995336A1
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EP
European Patent Office
Prior art keywords
sheet
rolled
temperature
rolling
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07290624A
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German (de)
English (en)
French (fr)
Inventor
Astrid Perlade
Olivier Bouaziz
Xavier Garat
Josée Drillet
Jean-Louis Uriarte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal France SA
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ArcelorMittal France SA
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Application filed by ArcelorMittal France SA filed Critical ArcelorMittal France SA
Priority to EP07290624A priority Critical patent/EP1995336A1/fr
Priority to US12/600,085 priority patent/US9580766B2/en
Priority to RU2009146543/02A priority patent/RU2436849C2/ru
Priority to JP2010507948A priority patent/JP5552045B2/ja
Priority to ES08805524.9T priority patent/ES2356186T5/es
Priority to PL08805524T priority patent/PL2155916T5/pl
Priority to EP08805524.9A priority patent/EP2155916B2/fr
Priority to PCT/FR2008/000610 priority patent/WO2008145872A1/fr
Priority to UAA200912894A priority patent/UA99827C2/ru
Priority to KR1020097023754A priority patent/KR101476866B1/ko
Priority to KR1020147027952A priority patent/KR20140129365A/ko
Priority to CA2687327A priority patent/CA2687327C/fr
Priority to BRPI0811610-5A2A priority patent/BRPI0811610A2/pt
Priority to MX2009012221A priority patent/MX2009012221A/es
Priority to DE602008003801T priority patent/DE602008003801D1/de
Priority to AT08805524T priority patent/ATE490348T1/de
Priority to CN2008800160910A priority patent/CN101755057B/zh
Priority to ARP080102046A priority patent/AR066569A1/es
Publication of EP1995336A1 publication Critical patent/EP1995336A1/fr
Priority to ZA200907619A priority patent/ZA200907619B/xx
Priority to MA32326A priority patent/MA31363B1/fr
Priority to JP2013206098A priority patent/JP5728547B2/ja
Priority to US15/374,827 priority patent/US9765415B2/en
Withdrawn legal-status Critical Current

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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
    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips 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

Definitions

  • the invention relates to a ferritic sheet of hot-rolled or cold-rolled steel, having a strength greater than 400 MPa and a density of less than about 7.3, and its manufacturing process.
  • the microstructure at ambient temperature of the steels consists of an equiaxed ferrite matrix whose average grain size is less than 50 micrometers.
  • Aluminum is mainly in solid solution in this matrix based on iron.
  • These steels contain kappa precipitates (" ⁇ ") which are a ternary Fe 3 AlC x intermetallic phase. The presence of these precipitates in the ferritic matrix leads to a significant hardening.
  • ⁇ precipitates must not be present in the form of a marked intergranular precipitation under penalty of a significant reduction in ductility: the inventors have shown that the ductility was reduced when the linear fraction of ferritic grain boundaries which present K precipitation was greater than or equal to 30%.
  • this linear fraction f is given to the figure 1 : If we consider a particular grain whose contour is limited by successive grain boundaries of length L 1 , L 2 , .. L i , observations by microscopy show that this grain may have precipitates K along the joints over a length d 1 , ..d i ...
  • the linear fraction comprising precipitates K is defined by the expression f: ⁇ s di means the total length of grain boundaries with precipitated ⁇ , relative to the surface (S) considered.
  • ⁇ s Li represents the total length of the grain boundaries relative to the surface (S) considered.
  • the expression f thus translates the degree of recovery of the ferritic grain boundaries by a precipitation K.
  • the semi-finished products were heated to a temperature of 1220 ° C. and hot-rolled to obtain a sheet having a thickness of about 3.5 mm.
  • the references I1-a, I1-b, I1-c, I1-d, 11-e designate, for example, five steel sheets manufactured under different conditions from the composition 11.
  • Table 2 details the conditions of the successive hot rolling stages: The number N of rolling steps carried out at a hot rolling temperature greater than 1050 ° C. - Of these, the number N i of rolling steps whose reduction rate is greater than 30% The time t i flowing between each of the steps N i , and the rolling step immediately succeeding each of these - The end of rolling temperature T FL - The time interval tp flowing on cooling between 850 and 700 ° C - The winding temperature T bob Table 2: Manufacturing conditions during hot rolling landmark NOT N i t i (s) TFL (° C) tp (s) Tbob (° C) 14.5 11a I 4 3 20.6 900 21 700 26.8 2 I1b R 6 2 2 2 2 900 21 700 I1c R 4 1 8 900 1.3 700 26.5 i 1d I 5 3 23.5 900 21 700 20 7.7 5.2 I1E R 7 5 3.5 1050 20 700 3 2.5 i3a I 4 2 10 950 20 700 11 i3b
  • Table 3 shows the density measured on the plates of Table 2 and certain mechanical and microstructural characteristics.
  • the resistance Rm, the uniform elongation Au, the elongation at break A t, have thus been measured in the cross-machine direction with respect to rolling.
  • the IV grain size was also measured by the method of linear intercepts according to the NF EN ISO 643 standard on a surface perpendicular to the direction transverse to the rolling. The measurement of d IV was carried out in the direction perpendicular to the thickness of the sheet. In order to obtain increased mechanical properties, it is more particularly desired to obtain a grain size of IV less than 100 microns.
  • Table 3 Properties of hot-rolled sheets obtained from I1 and I3 steels.
  • the steel sheets according to the invention are characterized by a grain size IV less than 100 micrometers and have a strength ranging from 505 to 645 MPa.
  • the sheet I1c was laminated with an insufficient number of rolling steps with a rate greater than 30%, a time interpasse and a time interval t P too short.
  • the consequences are identical to those noted on sheets I1b and I1e.
  • the time interval tp being too low, a hardening precipitation of K precipitates and TiC carbides occurs only partially, which does not make it possible to take full advantage of the curing possibilities.
  • the steel R1 has an insufficient titanium content which leads to a solid solution carbon content that is too high: the folding ability is then reduced.
  • Steel R2 has an insufficient aluminum content which does not allow to obtain a density lower than 7.3.
  • R3, R4, R5 and R6 steels contain too much aluminum and possibly carbon: their ductility is reduced due to the excessive precipitation of intermetallic phases or carbides
  • Example 2 Cold-rolled and annealed sheets
  • references I3a1, I3a2, 13a3, 13a4 designate four steel sheets manufactured under different conditions of cold rolling and annealing from the hot-rolled sheet 13a.
  • Table 5 Production conditions for cold-rolled and annealed sheets landmark Ability to rolling to cold T ' V
  • No satisfactory (cracks in cross-direction) I according to the invention.
  • R reference Underlined Values: Not in accordance with the invention.
  • Table 6 shows some of the mechanical, chemical, microstructural and sheet density characteristics of Table 5. This was measured by transverse tensile tests with respect to rolling, the yield strength Re, the resistance Rm, the uniform elongation Au, the elongation at break A t . By means of scanning electron microscopy observations, the presence of cleavage facets on the rupture surfaces of the test specimens was noted.
  • the soil sol carbon content in solid solution was also measured.
  • the ability to bend and press was evaluated. It was also noted the possible presence of scuffing consecutive deformations.
  • microstructure of these recrystallized sheets consists of equiaxed ferrite whose average ⁇ - grain size was measured in the transverse rolling direction. The rate of recovery of ferritic grain boundaries by K precipitation was also measured using the Aphelion TM image analysis software .
  • Table 6 Mechanical properties of cold-rolled and annealed sheets obtained from I1 and I3 steels.
  • the steel sheets I1a1 and I3a1 have a solid solution carbon content, a ferritic equiaxed grain size, and a grain boundary recovery ratio that satisfies the conditions of the invention. As a result, the ability to bend, stamping, scratch resistance of these sheets, is high.
  • the figure 4 illustrates the microstructure of the steel sheet I1a1 according to the invention.
  • the figure 5 illustrates the microstructure of another steel sheet according to the invention, I3a1: note the presence of K precipitates of which only a small amount is present in intergranular form, which allows to maintain a high ductility.
  • the steel sheet I1a2 was cooled at a too high speed after annealing: the carbon is then completely in solid solution, which causes a reduction in ductility of the matrix resulting in the local presence of fragile areas on the plates. facies of rupture.
  • the sheet 13a2 has been cooled too fast and also leads to an excessive content of solid solution.
  • the figure 6 illustrates the microstructure of the sheet I3a3: it was annealed at too high a temperature T ': the ⁇ precipitates present before the annealing were dissolved, their subsequent precipitation after cooling intervened in an excessive amount of intergranular form. This results in the local presence of fragile beaches on fracture facies.
  • the I3a4 sheet was also annealed at a temperature which causes partial dissolution of the precipitates K.
  • the carbon content in solid solution is excessive.
  • the steel sheet I1c1 was made from a hot-rolled sheet not satisfying the requirements of the invention: the equiaxial grain size is too large, the crimping resistance and the stamping ability are insufficient.
  • the hot-rolled sheet I3b which does not satisfy the criteria of the invention, is not suitable for deformation since transverse cracks appear during cold rolling.
  • the steels according to the invention have good continuous galvanizing properties, in particular during an annealing cycle at 800 ° C. with a dew point temperature higher than -20 ° C.
  • the steels according to the invention thus have a combination of properties (density, mechanical strength, deformability, weldability, coating) particularly interesting. These steel sheets are used with advantage for the manufacture of skin parts or structure in the automotive field.

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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)
EP07290624A 2007-05-16 2007-05-16 Acier à faible densité présentant une bonne aptitude à l'emboutissage Withdrawn EP1995336A1 (fr)

Priority Applications (22)

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
CN2008800160910A CN101755057B (zh) 2007-05-16 2008-04-29 具有良好可压延性的低密度钢
KR1020147027952A KR20140129365A (ko) 2007-05-16 2008-04-29 양호한 스탬핑성을 갖는 저밀도 강
BRPI0811610-5A2A BRPI0811610A2 (pt) 2007-05-16 2008-04-29 Aço com baixa densidade, apresentando uma boa aptidão ao encaixe
JP2010507948A JP5552045B2 (ja) 2007-05-16 2008-04-29 良好なスタンピング性能を有する低密度鋼
ES08805524.9T ES2356186T5 (es) 2007-05-16 2008-04-29 Acero de baja densidad que presenta un buen comportamiento en la embutición
PL08805524T PL2155916T5 (pl) 2007-05-16 2008-04-29 Stal o niskiej gęstości z dobrą zdolnością do wytłaczania
EP08805524.9A EP2155916B2 (fr) 2007-05-16 2008-04-29 Acier a faible densite presentant une bonne aptitude a l'emboutissage
PCT/FR2008/000610 WO2008145872A1 (fr) 2007-05-16 2008-04-29 Acier a faible densite presentant une bonne aptitude a l'emboutissage
UAA200912894A UA99827C2 (ru) 2007-05-16 2008-04-29 Сталь низкой плотности с хорошей способностью к штамповке, стальной лист, способ его изготовления и применения
KR1020097023754A KR101476866B1 (ko) 2007-05-16 2008-04-29 양호한 스탬핑성을 갖는 저밀도 강
US12/600,085 US9580766B2 (en) 2007-05-16 2008-04-29 Low-density steel having good drawability
CA2687327A CA2687327C (fr) 2007-05-16 2008-04-29 Acier a faible densite presentant une bonne aptitude a l'emboutissage
RU2009146543/02A RU2436849C2 (ru) 2007-05-16 2008-04-29 Сталь низкой плотности, обладающая хорошей деформируемостью при штамповке
MX2009012221A MX2009012221A (es) 2007-05-16 2008-04-29 Acero de densidad reducida que presenta una buena capacidad para el embutido.
DE602008003801T DE602008003801D1 (de) 2007-05-16 2008-04-29 Stahl von geringer dichte mit guten prägeeigenschaften
AT08805524T ATE490348T1 (de) 2007-05-16 2008-04-29 Stahl von geringer dichte mit guten prägeeigenschaften
ARP080102046A AR066569A1 (es) 2007-05-16 2008-05-15 Chapa de acero ferritico laminada en caliente y proceso para su fabricacion
ZA200907619A ZA200907619B (en) 2007-05-16 2009-10-30 Low-density steel having good drawability
MA32326A MA31363B1 (fr) 2007-05-16 2009-11-03 Acier faible densite presentant une bonne aptitude a l'emboutissage.
JP2013206098A JP5728547B2 (ja) 2007-05-16 2013-10-01 良好なスタンピング性能を有する低密度鋼
US15/374,827 US9765415B2 (en) 2007-05-16 2016-12-09 Low density steel having good drawability

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CN109868420A (zh) * 2017-12-04 2019-06-11 现代自动车株式会社 铁素体钢

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US20100300585A1 (en) 2010-12-02
KR20100019443A (ko) 2010-02-18
US20170101694A1 (en) 2017-04-13
MA31363B1 (fr) 2010-05-03
CA2687327C (fr) 2012-06-26
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WO2008145872A1 (fr) 2008-12-04
PL2155916T5 (pl) 2016-06-30
JP2010526939A (ja) 2010-08-05
PL2155916T3 (pl) 2011-05-31
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EP2155916B2 (fr) 2015-03-11
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DE602008003801D1 (de) 2011-01-13
RU2436849C2 (ru) 2011-12-20
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US9765415B2 (en) 2017-09-19
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US9580766B2 (en) 2017-02-28
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