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EP1865086B1 - Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse et au bore et procédé de sa fabrication - Google Patents

Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse et au bore et procédé de sa fabrication Download PDF

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Publication number
EP1865086B1
EP1865086B1 EP06115075A EP06115075A EP1865086B1 EP 1865086 B1 EP1865086 B1 EP 1865086B1 EP 06115075 A EP06115075 A EP 06115075A EP 06115075 A EP06115075 A EP 06115075A EP 1865086 B1 EP1865086 B1 EP 1865086B1
Authority
EP
European Patent Office
Prior art keywords
hot
steel
rolled strip
cold
rolling
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.)
Not-in-force
Application number
EP06115075A
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German (de)
English (en)
Other versions
EP1865086A1 (fr
Inventor
Dr.-Ing Jian Bian
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Priority to AT06115075T priority Critical patent/ATE477348T1/de
Priority to DE502006007636T priority patent/DE502006007636D1/de
Priority to EP06115075A priority patent/EP1865086B1/fr
Priority to PCT/EP2007/055130 priority patent/WO2007141152A1/fr
Publication of EP1865086A1 publication Critical patent/EP1865086A1/fr
Application granted granted Critical
Publication of EP1865086B1 publication Critical patent/EP1865086B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D8/0405—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 of ferrous alloys
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C22C38/04—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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer

Definitions

  • the invention relates to a use of a steel flat product produced from a manganese-boron steel, and a method for its production.
  • MnB steels of the type used according to the invention are used in particular in the field of automobile construction for the production of components which are said to have a high strength in addition to a low weight.
  • Manganese-boron steels of the type in question which are standardized in EN 10083-3, have proven particularly suitable for the hot-pressing deformation. These steels have a good hardenability, which allows safe process control during hot pressing and by which it is economically possible to effect a martensite hardening in the mold without additional cooling during the hot deformation.
  • 22MnB5 steel A MnB steel proven in practice for the purposes summarized above is known as "22MnB5" and has been given the material number 1.5528 in the steel key, 2004 edition.
  • 22MnB5 steel on the market contains, in addition to iron and unavoidable impurities (in wt%), 0.220-0.250% C, 1.2-1.4% Mn, 0.2-2.3% Si, up to 0 , 02% P, up to 0.005% S, 0.020-0.050% Al, 0.020-0.050% Ti, 0.11-0.2% Cr, 0.002-0.0035% B and in each case up to 0.1% Mo, Cu and Ni (Material Data Sheet 11-112 of Salzgitter Flachstahl GmbH, November 2005 edition).
  • a MnB steel in addition to iron and unavoidable impurities (in% by weight), has a carbon content of more than 0.20%, but less than 0.5%, a manganese content of more than 0.5%, but less than 3%, a silicon content of more than 0.1%, but less than 0.5%, a chromium content of more than 0.01% but less than 1%, a titanium content of less than 0.2%, an aluminum content of less than 0.1%, a phosphorus content of less than 0.1%, should have a sulfur content of less than 0.05% and a boron content of more than 0.0005%, but less than 0.08%.
  • An Indian EP 0 971 044 B1 As an exemplary embodiment, provided with an Al coating steel sheet has accordingly (in wt .-%) 0.21% C, 1.14% Mn, 0.020% P, 0.0038% S, 0.25% Si, 0, 04% Al, 0.009% Cu, 0.020% Ni, 0.18% Cr, 0.0040% N, 0.032% Ti, 0.003% B and 0.0050% Ca. After a heat treatment, the strength of this steel sheet should be more than 1500 MPa.
  • the residual fracture strain of the known steels is typically only 5-6%.
  • steels are needed, in addition to a high strength and an improved elongation behavior of the manufactured from such a steel component after hot pressing.
  • the steel sheet consists of a steel, which in addition to iron and unavoidable impurities (in wt .-%) C: 0.05 to 0.2%, Si: 0.2 to 2.0%, Mn: 0.2 to 2 , 5%, Al: 0.01 to 1.5%, Ni: 0.73 to 5.0%, P: ⁇ 0.03% and S: ⁇ 0.02%, and optionally one or more of the following ingredients Cu: ⁇ 0.2%, B: 0.0002 to 0.01%, Co: ⁇ 0.3%, Sn: ⁇ 0.3%, Mo: ⁇ 0.5%, Cr: ⁇ 1%, V : ⁇ 0.3%, Ti: ⁇ 0.06%, Nb: ⁇ 0.06%, rare earth metals ⁇ 0.05%, Ca: ⁇ 0.05%, Zr: ⁇ 0.05%,
  • the ratio of Si to Al should be set so that the Condition 0.4 (%) ⁇ Si + 0.8 Al (%) ⁇ 2.0% is satisfied.
  • the volume percentage of retained austenite in the steel sheet should be 2 to 20%.
  • the ratio of Ni, Cu, Co, Sn and Si, Al in 0.5 ⁇ m of the steel sheet surface layer is set so that the condition Ni + Cu + Co + Sn (%) ⁇ 1/4 Si + 1/3 Al (%), a Zn-plated layer specifically alloyed should adhere particularly well to the flat steel product.
  • the plating layer comprises Al: ⁇ 1%, optionally Fe: 8 to 15% and optionally one or more constituents selected from Mn: ⁇ 0.02%, Pb: ⁇ 0.01%, Fe: ⁇ 0.2% ,
  • the Zn layer may also be Sb: ⁇ 0.01%, Ni: ⁇ 3.0%, Cu: ⁇ 1.5%, Sn: ⁇ 0.1%, Co: ⁇ 0.1%, Cd: ⁇ 0.01%, and Cr: ⁇ 0.05%.
  • the principle used according to this prior art thus presupposes certain minimum contents of Si and Al, whereas the combination of the Mn and B contents plays only a minor role. Instead, like the one in the EP 1 160 346 A1 specified embodiments and explanations show, the Cu content of particular importance.
  • a method for producing a higher strength plate which is at least 70 mm thick and which is composed of a steel containing (in% by weight) 0.04-0.20% C, 0, 0002-0.0-03 % B and 0, 0003 - 0, 0025% Ca, balance iron and unavoidable impurities, the carbon content being C% in relation to the boron content B% of Steel is set so that the condition 0.1 ⁇ C% + 100 x B% ⁇ 0.32 is met. At the same time certain conditions are to be met for the bainite content of the steel sheet.
  • the addition of Ca is intended to improve the toughness in the heat-affected zone of a weld, which is produced when welding the heavy plate. It is obvious that heavy plates of this type are neither suitable for their range of characteristics nor their dimensions for hot pressing.
  • the invention therefore an object of the invention to provide a use of a flat steel product, which is due to its composition and properties particularly suitable for the production of components that in terms of in practice from such flat steel products , like steel strips or steel sheets, manufactured components certainly meet requirements.
  • a method for producing such a flat steel product should be specified.
  • this object has been achieved by using a manganese-boron steel according to the invention for the production of a hot-pressed component, which contains (in% by weight) 0.1-0.20% C, 0.05 - 0.30% Si, 0.8 - 1.8% Mn, 0.5 - 1.8% Ni, up to 0.015% P, up to 0.003% S, 0.0002 - 0.0080% B and the remainder contains iron and unavoidable impurities.
  • the MnB steel of the present invention may optionally contain 0.01-0.1% Ti, 0.01-0.05% Al, 0.002-0.005% N each in combination or alone.
  • a component which is hot-pressed under the use of such a flat steel product according to the invention has a tensile strength R m of at least 1,000 MPa and has an elongation at break A 80 of more than 10%.
  • MnB steel used according to the invention contains contents of Ni in order to significantly increase the elongation at break and toughness of components obtained from the steel used according to the invention after a hardened state obtained by hot press forming.
  • the presence of Ni improves the hardenability of MnB steels used according to the invention, so that the Mn contents could be reduced and the addition of critical Cr in terms of its influence on the residual ductility could be dispensed with.
  • the C content of steels used according to the invention has also been modified in such a way that the martensite hardness produced in the course of hot pressing is reduced or the components obtained after hot pressing have a bainitic structure in favor of improved extensibility, by virtue of the toughness and elongation at break of steel used according to the invention produced components is also positively influenced. If emphasis is placed on increased strength of the steel used according to the invention, in the Under the invention, the C content in the range of 0.15 to 0.20 wt .-% can be adjusted. In contrast, C contents of 0.10-0.15% by weight have proved to be useful for a less solid, but particularly good residual ductility and toughness, even after the hot-pressing molding and the steel having hardened therein.
  • Mn content By modifying the Mn content, it is also possible to influence the residual elongation and hardenability of the steel used according to the invention. Reduced Mn contents in the range of 0.8-1.6% by weight of improved residual extensibility are beneficial, while at Mn contents of 1.0-1.8% by weight improved hardenability of the inventively used Steel is present.
  • the residual elongation and the hardenability of the steel used according to the invention can be adjusted.
  • lower Ni contents lying in the range of 0.5-1.8% by weight, in particular in the range of 0.8-1.5% by weight lead to higher hardenability and at the same time to improved toughness, whereby together an improved residual elongation is achieved.
  • a steel used according to the invention with lower strength but with further improved residual elongation after hardening achieved during hot deformation has (in% by weight) 0.10-0.15% C, 0.05-0.30% Si , 0 - 1.8% Mn, 0.8 - 1.8% Ni, max. 0.015% P, max. 0.003% S, 0.0002 - 0.0080% B and the remainder iron and unavoidable impurities.
  • the hardening effect of boron in a steel used according to the invention occurs in particular when the B content is at least 0.0008% by weight.
  • the flat steel product used according to the invention may be a hot-rolled or cold-rolled steel strip or sheet.
  • composite steel strips or steel sheets used according to the invention are outstandingly suitable for surface refinement by application of a metallic coating. This can be applied for example by Feueralumtechnik or hot dip galvanizing and by a combination of these methods.
  • the corrosion protection respectively obtained by the metallic coating can additionally be improved by additionally providing the flat steel product used according to the invention with an organic or inorganic coating.
  • the resulting hot strip can be descaled for further processing in a conventional manner, for example by pickling. If the resulting flat steel product is to be fed directly as a hot strip of the forming to a component, can now be applied as corrosion protection, a metallic coating in the manner already described above. Alternatively, the hot strip may be cold rolled after the pickling, if necessary, to cold strip. The degrees of cold rolling achieved during cold rolling, preferably without intervening intermediate annealing, should be at least 40% in order to ensure complete recrystallization.
  • the steel melts S1, S2 have subsequently been cast into thin slabs in a likewise conventional cast roll mill.
  • Hot strips were then hot rolled from the resulting thin slabs.
  • the hot rolling end temperature was 850 ° C.
  • the obtained hot strips were coiled at a coiling temperature which was 560 ° C.
  • cold rolling degree reduction in thickness / thickness of the cold rolled hot strip achieved by the cold rolling
  • samples separated from the obtained cold tapes were coated with a metallic coating by fire aluminizing.
  • the metallic coating consisted of 89-92% by weight of Al, balance Si.
  • a second sample was fire-aluminized with a coating containing 55% by weight of Al, 43.4% by weight of Zn and 1.6% by weight of Si.
  • the samples thus treated have been hot stamped into body parts.
  • the components thus obtained had tensile strengths of more than 1,000 MPa and an elongation at break A 80 of at least 10%.
  • the lower yield strength could be increased by at least 80 MPa, without the strength and elongation at break of the components changed.
  • a martensitic, a bainitic or a mixed martensitic-bainitic structure was present in the components obtained.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (17)

  1. Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse-bore, qui contient (en % en poids) C: 0,1 - 0,20 %, Si: 0,05 - 0,30 %, Mn: 0,8 - 1,8 %, Ni: 0,5 - 1,8 %, P: ≤ 0,015 %, S: ≤ 0,003 %, B: 0,0002 - 0,0080 %,
    ainsi que, en option, l'un ou plusieurs des éléments Ti, Al et N, dans les proportions suivantes: Ti: 0,01 - 0,1 %, Al: 0,01 - 0,05 %, N: 0,002 - 0,005 %,
    le complément étant du fer et des impuretés inévitables, le produit plat étant destiné à la fabrication d'une pièce façonnée à chaud à la presse, qui présente une résistance à la traction Rm d'au moins 1.000 MPa et un allongement à la rupture de plus de 10 %.
  2. Utilisation selon la revendication 1, caractérisée en ce que l'acier contient 0,15 - 0,20 % en poids de carbone.
  3. Utilisation selon la revendication 1, caractérisée en ce que l'acier contient 0,10 - 0,15 % en poids de carbone.
  4. Utilisation selon l'une des revendications précédentes, caractérisée en ce que l'acier contient 0,8 - 1,6 % en poids de manganèse.
  5. Utilisation selon l'une des revendications 1 à 3, caractérisée en ce que l'acier contient 1,0 - 1,8 % en poids de manganèse
  6. Utilisation selon l'une des revendications précédentes, caractérisée en ce que l'acier contient 0,5 - 1,0 % en poids de nickel.
  7. Utilisation selon l'une des revendications 1 à 5, caractérisée en ce que l'acier contient 0,8 - 1,8 % en poids de nickel
  8. Utilisation selon l'une des revendications précédentes, caractérisée en ce que l'acier contient au moins 0,0008 % en poids de bore.
  9. Procédé pour la fabrication d'un produit plat en acier pour l'utilisation selon l'une des revendications 1 à 8, lequel procédé comprend les étapes suivantes :
    - fusion d'un acier au manganèse-bore liquide, qui contient (en % en poids) C: 0,1 - 0,20 %, Si: 0,05 - 0,30 %, Mn: 0,8 - 1,8 %, Ni: 0,5 - 1,8 %, P: ≤ 0,015 %, S: ≤ 0,003 %, B: 0,0002 - 0,0080 %,
    ainsi que, en option, l'un ou plusieurs des éléments Ti, Al et N, dans les proportions suivantes: Ti : 0,01 - 0,1 %, Al: 0,01 - 0,05 %, N: 0,002 - 0,005 %,
    le complément étant du fer et des impuretés inévitables,
    - coulée du bain de fusion pour obtenir des brames ou des brames minces,
    - laminage à chaud des brames ou des brames minces à une température de laminage à chaud de 850 - 900 °C pour obtenir un feuillard à chaud,
    - bobinage du feuillard à chaud à une température de bobinage de 560 - 600 °C.
  10. Procédé selon la revendication 9, caractérisé en ce que le feuillard à chaud est décalaminé après le laminage à chaud.
  11. Procédé selon revendication 9 ou 10, caractérisé en ce que le feuillard à chaud, après le laminage à chaud, est laminé à froid en un feuillard à froid.
  12. Procédé selon la revendication 11, caractérisé en ce que le laminage à froid est exécuté sans recuit intermédiaire.
  13. Procédé selon l'une des revendications 11 ou 12, caractérisé en ce que le degré de laminage, obtenu lors du laminage à froid, est d'au moins 40 %.
  14. Procédé selon l'une des revendications 9 à 13, caractérisé en ce que le feuillard à chaud décalaminé ou le feuillard à froid est valorisé en surface par un revêtement métallique.
  15. Procédé selon la revendication 14, caractérisé en ce que le feuillard à chaud décalaminé ou le feuillard à froid est aluminié à chaud.
  16. Procédé selon la revendication 14, caractérisé en ce que le feuillard à chaud décalaminé ou le feuillard à froid est galvanisé à chaud.
  17. Procédé selon l'une des revendications 14 à 16, caractérisé en ce que le feuillard à chaux décalaminé ou le feuillard à froid, pourvu du revêtement métallique, est pourvu d'un revêtement organique ou anorganique.
EP06115075A 2006-06-07 2006-06-07 Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse et au bore et procédé de sa fabrication Not-in-force EP1865086B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT06115075T ATE477348T1 (de) 2006-06-07 2006-06-07 Verwendung eines aus einem mangan-bor-stahl hergestellten flachproduktes und verfahren zu dessen herstellung
DE502006007636T DE502006007636D1 (de) 2006-06-07 2006-06-07 Verwendung eines aus einem Mangan-Bor-Stahl hergestellten Flachproduktes und Verfahren zu dessen Herstellung
EP06115075A EP1865086B1 (fr) 2006-06-07 2006-06-07 Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse et au bore et procédé de sa fabrication
PCT/EP2007/055130 WO2007141152A1 (fr) 2006-06-07 2007-05-25 Acier manganèse-bore, produit plat préparé à partir d'un tel acier et procédé pour sa préparation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06115075A EP1865086B1 (fr) 2006-06-07 2006-06-07 Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse et au bore et procédé de sa fabrication

Publications (2)

Publication Number Publication Date
EP1865086A1 EP1865086A1 (fr) 2007-12-12
EP1865086B1 true EP1865086B1 (fr) 2010-08-11

Family

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Application Number Title Priority Date Filing Date
EP06115075A Not-in-force EP1865086B1 (fr) 2006-06-07 2006-06-07 Utilisation d'un produit plat fabriqué à partir d'un acier au manganèse et au bore et procédé de sa fabrication

Country Status (4)

Country Link
EP (1) EP1865086B1 (fr)
AT (1) ATE477348T1 (fr)
DE (1) DE502006007636D1 (fr)
WO (1) WO2007141152A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2390530B1 (fr) * 2010-05-31 2012-03-28 iwis motorsysteme GmbH & Co. KG Chaîne articulée dotée de maillons en acier bore-manganèse
MX2017014559A (es) * 2015-06-03 2018-03-15 Salzgitter Flachstahl Gmbh Componente endurecido por deformacion hecho de acero galvanizado, metodo de produccion para el mismo y metodo para producir una tira de acero adecuada para el endurecimiento por deformacion de los componentes.
WO2017006144A1 (fr) 2015-07-09 2017-01-12 Arcelormittal Acier pour trempe à la presse et pièce trempée à la presse fabriquée à partir d'un tel acier
DE102016200518A1 (de) * 2016-01-18 2017-07-20 Ford Global Technologies, Llc Fahrwerk-Hilfsrahmenanordnung zur Verbesserung der Crashsicherheit
WO2018220430A1 (fr) 2017-06-02 2018-12-06 Arcelormittal Tôle d'acier destinée à la fabrication de pièces trempées à la presse, pièce trempée à la presse présentant une association de résistance élevée et de ductilité d'impact, et procédés de fabrication de cette dernière
EP3814536A1 (fr) 2018-06-26 2021-05-05 Tata Steel Nederland Technology B.V. Acier martensitique laminé à froid à haute résistance et haute aptitude au cintrage et son procédé de production

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287012A (ja) * 1986-06-03 1987-12-12 Kobe Steel Ltd 溶接性に優れた低温用鉄筋棒の製造法
JP3043517B2 (ja) * 1992-06-15 2000-05-22 新日本製鐵株式会社 高強度熱延鋼板の製造方法
FR2780984B1 (fr) 1998-07-09 2001-06-22 Lorraine Laminage Tole d'acier laminee a chaud et a froid revetue et comportant une tres haute resistance apres traitement thermique
WO2000050658A1 (fr) 1999-02-22 2000-08-31 Nippon Steel Corporation Plaque d'acier galvanise a haute resistance, d'excellent comportement pour l'adhesion des placages de metal et la mise en forme sous presse, et plaque d'acier allie galvanise a haute resistance, et procede de production correspondant
JP2001107190A (ja) * 1999-10-07 2001-04-17 Nkk Corp 海岸耐候性に優れた高力ボルト・ナット用鋼
JP3993831B2 (ja) 2002-11-14 2007-10-17 新日本製鐵株式会社 熱間成形加工後の硬化能および衝撃特性に優れた鋼板およびその使用方法
JP4206056B2 (ja) 2004-05-26 2009-01-07 新日本製鐵株式会社 低ｙｒ高張力鋼板及びその製造方法

Also Published As

Publication number Publication date
DE502006007636D1 (de) 2010-09-23
EP1865086A1 (fr) 2007-12-12
ATE477348T1 (de) 2010-08-15
WO2007141152A1 (fr) 2007-12-13

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