EP0971044A1 - Clad hot-rolled and cold-rolled steel sheet, presenting a very high resistance after thermal treatment - Google Patents

Clad hot-rolled and cold-rolled steel sheet, presenting a very high resistance after thermal treatment Download PDF

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Publication number
EP0971044A1
EP0971044A1 EP99401690A EP99401690A EP0971044A1 EP 0971044 A1 EP0971044 A1 EP 0971044A1 EP 99401690 A EP99401690 A EP 99401690A EP 99401690 A EP99401690 A EP 99401690A EP 0971044 A1 EP0971044 A1 EP 0971044A1
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EP
European Patent Office
Prior art keywords
lt
sheet
composition
rolled
aluminum
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EP99401690A
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German (de)
French (fr)
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EP0971044B1 (en
Inventor
Jacques Devroc
Jean-Paul Hennechart
Jean-Pierre Laurent
Dominique Spehner
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ArcelorMittal France SA
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Sollac
LORRAINE DE LAMINAGE CONTINU Ste
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Priority to FR9808793A priority Critical patent/FR2780984B1/en
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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32Ferrous alloys, e.g. steel alloys containing chromium with boron
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00Stock material or miscellaneous articles
    • Y10S428/922Static electricity metal bleed-off metallic stock
    • Y10S428/9335Product by special process
    • Y10S428/939Molten or fused coating
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736Al-base component
    • Y10T428/1275Next to Group VIII or IB metal-base component
    • Y10T428/12757Fe

Abstract

A hot rolled steel sheet, consisting of a hot dip aluminized, shaped and heat treated sheet of low alloy steel of specified composition, is new. A novel hot rolled steel sheet consists of a steel of composition (by wt.) 0.15-0.5% (exclusive) C, 0.5-3% (exclusive) Mn, 0.1-0.5% (exclusive) Si, 0.01-1% (exclusive) Cr, less than 0.2% Ti, less than 0.1% Al, less than 0.1% P, less than 0.05% S, 0.0005-0.08% (exclusive) B, balance Fe and impurities. An Independent claim is also included for forming a part from the above steel sheet having a hot dip aluminized coating which is heated at more than 5 to 600 degrees C/s. or more after sheet forming and before heat treatment. Preferred Features: The sheet is hot dip coated in a bath of composition 2-3.5% Fe and balance Al, optionally with addition of 9-10% Si.

Description

L'invention concerne une tôle d'acier laminée à chaud et à froid, revêtue et comportant une très haute résistance après traitement thermique. The invention relates to a steel sheet hot-rolled and cold-coated and having a high strength after heat treatment.

Dans ce domaine technique, les solutions proposées entraínant une augmentation des caractéristiques mécaniques s'exercent au détriment des propriétés de mise en forme. In this technical field, the solutions resulting in increased mechanical properties are detrimental formatting properties. Il existe une solution consistant à séparer les propriétés de mise en forme et celles nécessaires à l'emploi. There is a solution of separating the forming properties and those required for use. Les caractéristiques nécessaires à l'emploi sont obtenues par un traitement thermique postérieur ou concomitant à la mise en forme. The characteristics required for the job are obtained by a subsequent heat treatment or concomitant with the formatting. Dans ce cas, les tôles proposées ne sont pas livrées revêtues pour des problèmes de tenues du revêtement lors du traitement thermique. In this case, the proposed sheets are not delivered coated outfits for problems of the coating during the heat treatment. Le revêtement est donc effectué sur pièces finies ce qui nécessite un nettoyage soigné des surfaces et des parties creuses. The coating is performed on finished parts which require careful cleaning of surfaces and hollow parts. De plus le traitement thermique doit être effectué sous atmosphère contrôlée afin d'éviter toute décarburation et oxydation du métal de la tôle. In addition the thermal treatment should be performed under a controlled atmosphere to avoid oxidation and decarburization of the metal sheet. Les tôles en acier pour traitement thermique ne possèdent pas de pré-revêtement, ce qui nécessite des post-traitements de dégraissage, décapage et revêtement. heat treatment for steel sheets do not have a pre-coating, which requires degreasing post-processing, etching and coating.

Lors du revêtement en continu des produits plats laminés à chaud et à froid, le recuit préalable et le refroidissement précédant ou suivant l'opération de revêtement, à base de zinc ou d'aluminium, ne sont utilisés que pour amener la tôle à une température proche de celle du bain ou pour restaurer les propriétés mécaniques de la tôle dégradées lors du laminage à froid. When coating continuously hot-rolled and cold, pre-annealing and before cooling or following the coating process, based on zinc or aluminum, are used only for feeding the sheet at a temperature close to that of the bath or to restore the mechanical properties of the sheet degraded during cold rolling. Ces cycles thermiques sont choisis en fonction de la composition de l'acier afin qu'aucune transformation allotropique n'ait lieu lors du cycle thermique, l'objectif étant d'obtenir des caractéristiques mécaniques similaires à celles mesurées sur les tôles d'acier livrées non revêtues. These thermal cycles are selected depending on the composition of the steel so that no allotropic transformation takes place during the thermal cycle, the objective being to obtain similar mechanical properties to those measured on the delivered steel sheet unpaved.

Le but de l'invention est de produire une tôle d'acier laminée à chaud ou à froid d'une épaisseur désirée, revêtue, et présentant des possibilités de mise en forme étendues et qui, après traitement thermique effectué sur la pièce finie, permette d'obtenir une résistance mécanique supérieure à 1000 MPa, une résistance aux chocs, à la fatigue, à l'abrasion et à l'usure importante, tout en conservant une bonne résistance à la corrosion ainsi qu'une bonne aptitude à la peinture et au collage. The object of the invention is to produce a hot rolled steel sheet or cold to a desired thickness, coated, and with extensive shaping possibilities and which, after thermal treatment performed on the finished part, allowing to obtain a greater than 1000 MPa strength, resistance to shocks, fatigue, abrasion and high wear, while retaining a good corrosion resistance and good paintability and bonding. Il doit être également possible de réaliser la mise en forme à chaud avec trempe dans l'outil en obtenant les mêmes propriétés. It must also be possible to realize the hot shaping with quenching in the tool in obtaining the same properties.

L'invention a pour objet une tôle d'acier laminée à chaud, pouvant être éventuellement ensuite laminée à froid, revêtue et traitée themiquement, l'acier de la tôle ayant la composition pondérale suivante : The invention relates to a steel sheet hot-rolled, optionally being then cold rolled, coated and treated themiquement, the steel sheet having the following composition by weight:
0,15% < carbone < 0,5% 0.15% <carbon <0,5%
0,5% < manganèse < 3% 0.5% <manganese <3%
0,1% < silicium < 0,5% 0.1% <silicon <0.5%
0,01% < chrome < 1%, 0,01% <chromium <1%
titane < 0,2%, titanium <0,2%
aluminium < 0,1%, aluminum <0,1%
phosphore < 0,1%, phosphorus <0,1%
soufre < 0,05%, sulfur <0.05%
0,0005% < bore < 0,08%, le solde étant du fer et des impuretés inhérentes à l'élaboration. 0,0005% <boron <0,08%, the balance being iron and impurities inherent in processing.

Les autres caractéristiques de l'invention sont: Other features of the invention are:

  • la composition pondérale de la tôle est de préférence la suivante: the ponderal composition of the sheet is preferably as follows:
    0,20% < carbone < 0,5% 0.20% <carbon <0,5%
    0,8% < manganèse < 1,5% 0.8% <manganese <1.5%
    0,1% < silicium < 0,35% 0.1% <silicon <0,35%
    0,01% < chrome < 1%, 0,01% <chromium <1%
    titane < 0,1%, titanium <0,1%
    aluminium < 0,1%, aluminum <0,1%
    phosphore < 0,05%, phosphorus <0.05%
    soufre < 0,03%, sulfur <0.03%
    0,0005% < bore < 0,01%, le solde étant du fer et des impuretés inhérentes à l'élaboration. 0,0005% <boron <0,01%, the balance being iron and impurities inherent in processing.
  • dans la composition pondérale de la tôle, la teneur en titane par rapport à la teneur en azote est supérieure à 3,42, le bore ne pouvant plus être combiné à l'azote . in the composition by weight of the sheet, the titanium content with respect to the nitrogen content is greater than 3.42, boron may not be combined with nitrogen.
  • le bain métallique pour le revêtement comprend dans sa composition pondérale de base, de 9% à 10% de silicium, de 2% à 3,5% de fer, le solde étant de l'aluminium. the metallic bath for the coating comprises in its basic ponderal composition, from 9% to 10% silicon, from 2% to 3.5% iron, the balance being aluminum.
  • le bain métallique pour le revêtement comprend dans sa composition pondérale de base, de 2% à 4% de fer, le solde étant de l'aluminium. the metallic bath for the coating comprises in its basic ponderal composition, from 2% to 4% iron, the balance being aluminum.

L'invention concerne également un procédé de réalisation d'une pièce à partir de la tôle revêtue dans lequel après mise en forme et avant traitement thermique, le revêtement de la pièce est soumis à une élévation de température à une vitesse supérieure à 5°C/ seconde pouvant dépasser 600°C/seconde. The invention also relates to a method of producing a part from the coated sheet wherein after forming and before heat treatment, the workpiece coating is subjected to a temperature rise at a rate greater than 5 ° C / second that can exceed 600 ° C / second.

Une autre caractéristique du procédé est: Another feature of the process is:

  • le traitement thermique consiste à réchauffer le revêtement et la pièce à une température supérieure à 750°C. the heat treatment consists in heating the coating and the piece to a temperature above 750 ° C.

L'invention concerne aussi l'utilisation de la tôle d'acier laminée à chaud et pouvant être ensuite laminée à froid et revêtue, pour des pièces de structure et /ou anti-intrusion ou de soubassement pour véhicule terrestre à moteur comme par exemple une poutre de pare choc, un renfort de portière, un bras de roue... The invention also relates to the use of the steel plate hot rolled and can then be cold rolled and coated, for structural pieces and / or anti-intrusion or substructure for land motor vehicle such as a beam bumper, a door reinforcement, a wheel arm ...

La description qui suit fera bien comprendre l'invention. The following description will explain the invention.

La tôle selon l'invention qui est issue, du fait de son élaboration, d'un train de laminage à chaud, peut éventuellement être relaminée à froid en fonction de l'épaisseur finale désirée. The sheet of the invention which is derived as a result of its preparation, a hot rolling train, may optionally be re-roll cold depending on the desired final thickness. Elle est ensuite revêtue d'un revêtement à base d'aluminium, par exemple au trempé dans un bain comportant en outre, de 8% à 11% de silicium, de 2% à 4% de fer, la tôle présentant une haute résistance mécanique après traitement thermique et une haute tenue à la corrosion, ainsi qu'une bonne aptitude à la peinture et au collage. It is then coated with a coating based on aluminum, for example by dipping in a bath further comprising from 8% to 11% silicon, from 2% to 4% iron, the sheet having a high mechanical resistance after heat treatment and high corrosion resistance as well as good aptitude for painting and gluing.

Le revêtement a notamment pour fonction de protéger la tôle de base contre la corrosion à chaud comme à froid. The coating has in particular the function of protecting the basic sheet against hot corrosion as cold. Les caractéristiques mécaniques à l'état de livraison de la tôle selon l'invention autorisent une grande variété de mise en forme en particulier un emboutissage profond. The mechanical characteristics in the delivery state of the sheet according to the invention allow a wide variety of particular shaping a deep drawing. Le traitement thermique appliqué lors d'un procédé de formage à chaud ou après la mise en forme permet d'obtenir des caractéristiques mécaniques élevées pouvant dépasser 1500 MPa pour la résistance mécanique et 1200 MPa pour la limite d'élasticité. The heat treatment applied during hot forming process or after shaping enables to obtain high mechanical characteristics which can exceed 1500 MPa for mechanical resistance and 1200 MPa for the yield strength. Les caractéristiques mécaniques finales sont adaptables et dépendent de la teneur en carbone de l'acier et du traitement thermique. The final mechanical properties are flexible and depend on the carbon content of steel and heat treatment.

Lors du traitement thermique réalisé sur pièce finie ou lors d'un procédé de formage à chaud, le revêtement forme une couche présentant une grande résistance à l'abrasion, l'usure, la fatigue, le choc ainsi qu'une bonne tenue à la corrosion et une bonne aptitude à la peinture et au collage . During the heat treatment performed on finished part or during a hot-forming process, the coating forms a layer having a high resistance to abrasion, wear, fatigue, shock as well as a good resistance to corrosion and a good capacity for painting and gluing.

Selon l'invention l'acier dont la composition pondérale est la suivante : According to the invention the steel whose composition by weight is:
0,15% < carbone < 0,5% 0.15% <carbon <0,5%
0,5% < manganèse < 3% 0.5% <manganese <3%
0,1% < silicium < 0,5% 0.1% <silicon <0.5%
0,01% < chrome < 1%, 0,01% <chromium <1%
titane < 0,2%, titanium <0,2%
aluminium < 0,1%, aluminum <0,1%
phosphore < 0,1%, phosphorus <0,1%
soufre < 0,05%, sulfur <0.05%
0,0005% < bore < 0,08%, le solde étant du fer et des impuretés inhérentes à l'élaboration est élaboré sous la forme d'une tôle laminée à chaud et éventuellement laminée à froid pour obtenir l'épaisseur désirée. 0,0005% <boron <0,08%, the balance being iron and impurities inherent in processing is made in the form of a hot-rolled sheet and optionally cold rolled to obtain the desired thickness. La tôle d'acier est ensuite revêtue au trempé, après décapage, dans un bain d'aluminium contenant, soit de 8% à 11% de silicium et 2% à 4% de fer, soit de 2% à 4% de fer sans silicium, ou encore, dans un bain d'aluminium contenant de préférence de 9% à 10% de silicium et 2% à 3,5% de fer. The steel sheet is then coated by dipping, after pickling, in an aluminum bath containing either 8% to 11% silicon and 2% to 4% iron, or from 2% to 4% iron without silicon, or in a bath of aluminum preferably containing from 9% to 10% silicon and 2% to 3.5% iron.

Dans un exemple de réalisation, d'un revêtement de la tôle au trempé dans un bain métallique contenant un alliage d'aluminium comprenant une proportion d'environ 90% d'aluminium, la couche de revêtement comporte une première couche d'alliage en contact avec la surface de l'acier. In an exemplary embodiment, a coating of the sheet by dipping in a metal bath containing an aluminum alloy comprising a proportion of approximately 90% aluminum, the coating layer comprises a first alloy layer in contact with the steel surface. Cette couche, directement en contact avec la surface de la tôle est fortement alliée en fer. This layer, directly in contact with the surface of the sheet is highly alloyed with iron.

Une seconde couche de revêtement, au dessus de la première, contient environ, 90% d'aluminium et peut contenir, en fonction de la composition du bain, du silicium et un peu de fer. A second cladding layer, over the first, contains approximately 90% aluminum and may contain, depending on the bath composition, silicon and some iron.

La première couche d'alliage peut se fissurer lorsque la tôle est mise en forme pour la fabrication de pièces. The first alloy layer may crack when the sheet is shaped to the workpieces.

Selon une forme de l'invention, après la mise en forme de la pièce, le revêtement est soumis à une élévation de température à une vitesse supérieure à 5°C/ seconde pouvant dépasser 600°C/ seconde. In one form of the invention, after shaping the workpiece, the coating is subjected to a temperature rise at a rate greater than 5 ° C / second that can exceed 600 ° C / second. Cette montée en température permet une refusion rapide de l'aluminium qui colmate les fissures engendrées par l'opération de mise en forme de la pièce. This temperature rise permits rapid remelting of the aluminum which fills in the cracks generated by the shaping operation the workpiece.

Un autre intérêt de l'invention réside dans le fait que la diffusion du fer dans le revêtement sera initiée à haute température. Another advantage of the invention lies in the fact that the diffusion of iron in the coating is initiated at high temperature. On aura donc une meilleure cohésion entre revêtement et l'acier de la tôle. There will therefore be a better cohesion between the coating and the steel sheet. Dans une autre forme de l'invention, le traitement thermique peut être effectué localement, dans des zones fortement déformées. In another form of the invention, the heat treatment may be performed locally, in heavily deformed zones.

Dans un exemple de réalisation, la tôle d'acier selon l'invention contenant 0,21% de carbone; In an exemplary embodiment, the steel sheet according to the invention containing 0.21% carbon; 1,14% de manganèse; 1.14% manganese; 0,020% de phosphore; 0.020% phosphorus; 0,0038% de soufre; 0.0038% sulfur; 0,25% de silicium; 0.25% silicon; 0,040% d'aluminium; 0.040% aluminum; 0,009% de cuivre; 0.009% copper; 0,020% de nickel; 0.020% nickel; 0,18% de chrome; 0.18% chromium; 0,0040% d'azote; 0.0040% nitrogen; 0,032% de titane; 0.032% titanium; 0,003% de bore; 0.003% boron; 0,0050% de calcium est revêtue d'une couche à base d'aluminium ayant environ 20 µm d'épaisseur. 0.0050% calcium is coated with an aluminum based layer having about 20 .mu.m thick.

Selon l'invention, la tôle, à l'état de livraison en bobine ou en feuilles, dont l'épaisseur peut être comprise entre 0,25 mm et 15 mm a de bonnes propriétés de mise en forme ainsi qu'une bonne résistance à la corrosion ainsi qu'une bonne aptitude à la peinture et au collage. According to the invention, the sheet, in the delivery condition in coil or sheet, whose thickness can be between 0.25 mm and 15 mm has good shaping properties and a good resistance to corrosion and a good aptitude for painting and gluing.

La tôle, produit sidérurgique revêtu, présente une résistance importante à la corrosion à l'état de livraison, pendant la mise en forme et les traitements thermiques ainsi que pendant l'usage de la pièce finie. The sheet, steel coated product, has a substantial resistance to corrosion in the delivery state, during forming and thermal treatments as well as during use of the finished part. Après traitement thermique, on obtient une résistance mécanique importante pouvant dépasser 1500 MPa. After heat treatment, one obtains a high mechanical strength exceeding 1500 MPa. La présence du revêtement lors du traitement thermique des pièces permet d'éviter toute décarburation du métal de base ainsi que toute oxydation. The presence of the coating during the heat treatment of the parts avoids any decarburization of the base metal as well as any oxidation. Cela est un avantage indéniable, notamment, dans le cas de la mise en forme à chaud. That is an undeniable advantage, in particular, in the case of hot forming. De plus, le chauffage de la pièce traitée ne nécessite pas un four ayant une atmosphère contrôlée pour éviter une décarburation. In addition, heating the treated part does not require a furnace having a controlled atmosphere to prevent decarbonisation.

Le traitement thermique du métal de la tôle consiste en un chauffage à une température comprise entre Ac1, température de début de transformation austénitique, par exemple, 750°C, et 1200°C, dans un four, pendant un temps qui est fonction de la température à atteindre et l'épaisseur de la tôle de la pièce. Heat treating the metal sheet consists of heating to a temperature between Ac1, austenite transformation start temperature, e.g., 750 ° C, and 1200 ° C in an oven for a time which is a function of the temperature to be reached and the thickness of the sheet workpiece. La composition est optimisée afin de limiter le grossissement des grains lors du traitement thermique. The composition is optimized in order to limit the grain growth during the heat treatment. Si la structure visée est totalement martensitique, la température de maintien doit être supérieure à Ac3, par exemple 840°C, température de fin de formation austénitique. If the target structure is completely martensitic, the holding temperature must be higher than Ac3, for example 840 ° C, end temperature of austenite formation. Le maintien en température doit être suivi d'un refroidissement adapté à la structure finale visée. Temperature maintenance must be followed by a cooling adjusted to the final structure referred. Pour une structure totalement martensitique et pour un acier ayant la composition de l'exemple, la vitesse de refroidissement doit être supérieure à la vitesse critique de trempe qui est 27°C/s pour une austénitisation à 900°C pendant 5 mn, la tôle ayant une épaisseur de 1 mm environ. For a completely martensitic structure and for a steel having the composition of Example, the cooling rate must be greater than the critical quenching speed which is 27 ° C / s to austenitization at 900 ° C for 5 minutes, the sheet having a thickness of 1 mm.

Il est également possible d'obtenir des structures notamment, ferrito-bainitiques, ou ferrito-martensitiques, par un chauffage à une température comprise entre Ac1, par exemple, 750°C et Ac3, par exemple, 840°C suivi d'un refroidissement approprié. It is also possible to obtain structures in particular, ferritic-bainitic or ferritic-martensitic, by heating at a temperature between Ac1, for example, 750 ° C and Ac3, for example, 840 ° C followed by cooling appropriate. Suivant le niveau de résistance à atteindre et le traitement thermique appliqué, une ou plusieurs des ces phases sont présentes dans des proportions variables. Depending on the degree of resistance to be achieved and the thermal treatment applied, one or more of these phases are present in varying proportions. Pour les niveaux de résistance les plus élevés, la structure est majoritairement composée de martensite. For the highest levels of resistance, the structure is mainly composed of martensite.

Le chrome, le manganèse, le bore et le carbone sont ajoutés, dans la composition de l'acier selon l'invention, pour leur influence sur la trempabilité. Chromium, manganese, boron and carbon are added, in the composition of the steel according to the invention, for their effect on hardenability. De plus, le carbone permet d'atteindre de hautes caractéristiques mécaniques grâce à son effet sur la dureté de la martensite. In addition, the carbon achieves high mechanical characteristics thanks to its effect on the hardness of the martensite.

L'aluminium est introduit dans la composition afin de piéger l'oxygène et de protéger l'efficacité du bore. Aluminum is introduced into the composition in order to trap oxygen and to protect the effectiveness of the boron.

Le titane dont le rapport de la teneur par rapport à la teneur en azote doit être supérieure à 3,42 est introduit afin d'éviter la combinaison du bore avec l'azote, l'azote étant combiné avec le titane. Titanium whose ratio of the content relative to the nitrogen content should be greater than 3.42 is introduced to avoid the combination of boron with the nitrogen, the nitrogen being combined with titanium.

Les éléments d'alliages, Mn, Cr, B, permettent une trempabilité autorisant la trempe dans les outils d'emboutissage ou l'utilisation de fluides de trempe peu sévères limitant la déformation des pièces lors du traitement thermique. The alloying elements, Mn, Cr, B, allow a hardenability allowing hardening in the stamping tools or the use of mild hardening fluids limiting deformation of the parts during the heat treatment. De plus la composition selon l'invention est optimisée du point de vue de la soudabilité. Furthermore the composition according to the invention is optimized from the standpoint of weldability.

L'acier de la tôle peut subir un traitement de globulisation des sulfures effectué avec du calcium qui a pour effet d'améliorer la résistance à la fatigue de la tôle. The sheet steel can undergo treatment spheroidizing sulfides performed with calcium which has the effect of improving the fatigue strength of the sheet.

L'acier est particulièrement adapté pour la réalisation de pièces de structure et anti intrusion. The steel is particularly suited for the realization of structural parts and anti intrusion.

Le revêtement proposé permet d'éviter différentes opérations de préparation de surface comme pour les tôles en acier pour traitement thermique ne possédant pas de revêtement. The proposed coating avoids different surface preparation operations such as for steel sheets for thermal treatment not having no coating.

La modulation des paramètres de traitement thermique permet d'atteindre, avec une composition donnée, différents niveaux de résistance en tôle à chaud et en tôle à froid suivant l'épaisseur visée. The modulation of thermal treatment parameters makes it possible to achieve, with a given composition, different levels of hot sheet resistance and sheet cold according to the intended thickness.

Lors du traitement thermique, le revêtement à base par exemple d'aluminium se transforme en une couche alliée au fer et comportant différentes phases dépendant du traitement thermique et présentant une grande dureté pouvant dépasser 600HV100g. During the heat treatment, the coating based, for example aluminum is transformed into a layer alloyed with iron and comprising different phases depending on the thermal treatment and having a hardness exceeding 600HV100g.

Le tableau suivant présente un exemple de résistance maximale de la tôle d'acier selon l'invention après traitement thermique. The following table shows an exemplary maximum of the steel sheet resistance according to the invention after heat treatment.

Traitement thermique Heat treatment Rm (Mpa) Rm (Mpa)
850°C/5 mn 850 ° C / 5 min 1695 1695
900°C/5 mn 900 ° C / 5 min 1675 1675
950°C/5 mn 950 ° C / 5 min 1665 1665

Claims (8)

  1. Tôle d'acier laminée à chaud, pouvant être éventuellement, ensuite, laminée à froid, revêtue, et traitée thermiquement, l'acier de la tôle ayant la composition pondérale suivante : Sheet hot-rolled steel, optionally being then cold rolled, coated, and heat-treated, the steel of the sheet having the following composition by weight:
    0,15% < carbone < 0,5% 0.15% <carbon <0,5%
    0,5% < manganèse < 3% 0.5% <manganese <3%
    0,1% < silicium < 0,5% 0.1% <silicon <0.5%
    0,01% < chrome < 1%, 0,01% <chromium <1%
    titane < 0,2%, titanium <0,2%
    aluminium < 0,1%, aluminum <0,1%
    phosphore < 0,1%, phosphorus <0,1%
    soufre < 0,05%, sulfur <0.05%
    0,0005% < bore < 0,08%, le solde étant du fer et des impuretés inhérentes à l'élaboration. 0,0005% <boron <0,08%, the balance being iron and impurities inherent in processing.
  2. Tôle revêtue selon la revendication 1, caractérisée en ce que la composition pondérale de la tôle est de préférence la suivante: Coated sheet according to claim 1, characterized in that the ponderal composition of the sheet is preferably as follows:
    0,20% < carbone < 0,5% 0.20% <carbon <0,5%
    0,8% < manganèse < 1,5% 0.8% <manganese <1.5%
    0,1% < silicium < 0,35% 0.1% <silicon <0,35%
    0,01% < chrome < 1%, 0,01% <chromium <1%
    titane < 0,1%, titanium <0,1%
    aluminium < 0,1%, aluminum <0,1%
    phosphore < 0,05%, phosphorus <0.05%
    soufre < 0,03%, sulfur <0.03%
    0,0005% < bore < 0,01%, le solde étant du fer et des impuretés inhérentes à l'élaboration. 0,0005% <boron <0,01%, the balance being iron and impurities inherent in processing.
  3. Tôle revêtue selon la revendication 1, caractérisée en ce que, dans la composition pondérale de la tôle, la teneur en titane par rapport à la teneur en azote est supérieure à 3,42, le bore ne pouvant plus être combiné à l'azote . Coated sheet according to claim 1, characterized in that, in the ponderal composition of the sheet, the titanium content with respect to the nitrogen content is greater than 3.42, boron may not be combined with nitrogen.
  4. Tôle revêtue selon la revendication 1, caractérisée en ce que le bain métallique pour le revêtement comprend dans sa composition pondérale de base, de 9% à 10% de silicium, de 2% à 3,5% de fer, le solde étant de l'aluminium. Coated sheet according to claim 1, characterized in that the metallic bath for the coating comprises in its basic ponderal composition, from 9% to 10% silicon, from 2% to 3.5% iron, the balance of 'aluminum.
  5. Tôle selon la revendication 1, caractérisée en ce que le bain métallique pour le revêtement comprend dans sa composition pondérale de base, de 2% à 4% de fer, le solde étant de l'aluminium. Sheet according to Claim 1, characterized in that the metallic bath for the coating comprises in its basic ponderal composition, from 2% to 4% iron, the balance being aluminum.
  6. Procédé de réalisation d'une pièce à partir de la tôle revêtue selon les revendications 1 à 5, caractérisé en ce que après mise en forme et avant traitement thermique, le revêtement de la pièce est soumis à une élévation de température à une vitesse supérieure à 5°C/ seconde pouvant dépasser 600°C/seconde. Process for producing a part from the coated sheet according to claims 1 to 5, characterized in that after forming and before thermal treatment, the coating of the piece is subjected to a temperature rise at a speed greater than 5 ° C / second that can exceed 600 ° C / second.
  7. Procédé selon la revendication 6 caractérisé en ce que le traitement thermique consiste à réchauffer le revêtement et la pièce à une température supérieure à 750°C. A method according to claim 6 characterized in that the heat treatment consists in heating the coating and the piece to a temperature above 750 ° C.
  8. Utilisation de la tôle d'acier laminée à chaud et pouvant être ensuite laminée à froid et revêtue, selon les revendications 1 à 5, pour des pièces de structure et /ou anti-intrusion ou de soubassement pour véhicule terrestre à moteur. Using the steel plate hot rolled and can then be cold rolled and coated, according to claims 1 to 5, for structural pieces and / or anti-intrusion or substructure for land motor vehicle.
EP19990401690 1998-07-09 1999-07-07 Clad hot-rolled and cold-rolled steel sheet, presenting a very high resistance after thermal treatment Active EP0971044B1 (en)

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FR9808793 1998-07-09

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JP (1) JP3931251B2 (en)
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DE (1) DE69907816T2 (en)
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FR2780984A1 (en) 2000-01-14
JP2000038640A (en) 2000-02-08
ES2196740T3 (en) 2003-12-16
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US6296805B1 (en) 2001-10-02
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CA2276911C (en) 2009-05-05
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