EP1587963A2 - Ultrahigh strength hot-rolled steel and method of producing bands - Google Patents

Ultrahigh strength hot-rolled steel and method of producing bands

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Publication number
EP1587963A2
EP1587963A2 EP04701978A EP04701978A EP1587963A2 EP 1587963 A2 EP1587963 A2 EP 1587963A2 EP 04701978 A EP04701978 A EP 04701978A EP 04701978 A EP04701978 A EP 04701978A EP 1587963 A2 EP1587963 A2 EP 1587963A2
Authority
EP
European Patent Office
Prior art keywords
steel
equal
hot rolled
iron
ferrite
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.)
Granted
Application number
EP04701978A
Other languages
German (de)
French (fr)
Other versions
EP1587963B1 (en
Inventor
Mireille Seux
Christophe Issartel
Fabienne Roumegoux
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
Original Assignee
USINOR SA
Arcelor France SA
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 USINOR SA, Arcelor France SA filed Critical USINOR SA
Publication of EP1587963A2 publication Critical patent/EP1587963A2/en
Application granted granted Critical
Publication of EP1587963B1 publication Critical patent/EP1587963B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C21D2211/002—Bainite
    • 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
    • C21D2211/008—Martensite
    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment

Definitions

  • the present invention relates to hot rolled steel with very high resistance, and to a method of manufacturing strips of this steel, the structure of which is bainito-martensitic and can contain up to 5% of ferrite.
  • Very high strength steels have been developed in recent years, in particular to meet the specific needs of the automotive industry, which are in particular the reduction of the weight and therefore of the thickness of the parts, and the improvement of safety. which involves increasing the resistance to fatigue and the impact resistance of the parts. These improvements must not further deteriorate the formability of the sheets used for the manufacture of the parts.
  • a second family of very high strength steels is made up of so-called dual phase steels, with a structure comprising around 10% ferrite and 90% martensite. These steels have very good formability, but resistance levels not exceeding 800 MPa.
  • the steel according to the invention can also include the following characteristics, alone or in combination:
  • the method according to the invention consists first of all in hot rolling a slab of specific composition, in order to obtain a homogeneous structure.
  • the rolling temperature is less than 950 ° C, and preferably less than 900 ° C.
  • the strip thus obtained is cooled to a temperature less than or equal to 400 ° C, maintaining a cooling rate greater than 50 ° C / s between 800 and 700 ° C.
  • This rapid cooling is carried out so that less than 5% of ferrite is formed, the presence of which is not desired, since the titanium would preferentially precipitate in this phase.
  • This cooling rate is preferably between 50 ° C / s and 200 ° C / s.
  • the method then consists in winding the strip at a winding temperature less than or equal to 250 ° C. We limit the temperature of this step in order to avoid causing an income from martensite, which would decrease the mechanical strength and raise the elastic limit, resulting in a poor E / Rm ratio.
  • the composition also includes chromium at a content of between 0.50% and 1.0%. A minimum content of 0.50% promotes the appearance of bainite in the microstructure. Its content is however limited to 1.0% since a high chromium content would favor the increase in the amount of ferrite formed beyond 5%, due to its alphagenic character.
  • the composition also includes silicon at a content of between 0.05% and 0.3%. It greatly improves the yield strength of steel while slightly reducing its ductility and deteriorating its coatability, which explains why its content is limited.
  • the composition also comprises titanium at a content of between 0.05 and 0.1%. This element makes it possible to significantly increase the mechanical characteristics by a phenomenon of precipitation during rolling and cooling. It does not increase hot hardness due to its moderate content. Its content is limited to 0.1% to avoid degrading the impact resistance properties, the hardness when hot, as well as the ability to fold.
  • the composition may also include phosphorus at a content of less than 0.05%, since beyond it could cause problems of segregation during continuous casting.
  • the microstructure of test 1, according to the invention is bainitomartensitic, while the microstructure of tests 2 and 3 is ferrito-martensitic. It is found that a cooling rate between 800 and 700C of less than 50 ° C / s, induces the presence of ferrite in a proportion greater than 5%. The titanium will then precipitate in this ferrite, which no longer makes it possible to obtain the level of mechanical characteristics sought, in particular a high Rm. Furthermore, a winding temperature above 250 ° C, associated with a cooling rate between 800 and 700 ° C below 50 ° C / s, increases the elastic limit without increasing the mechanical strength. The E / Rm ratio is therefore too high.
  • the steel according to the invention has a good ability to be coated by immersion in a bath of molten metal, such as zinc or a zinc alloy, or only aluminum or one of its alloys.

Abstract

A very high strength hot rolled steel has the following chemical composition, (by wt %): (a) 0.05 at most C at most 0.1; (b) 0.7 at most Mn at most 1.1; (c) 0.5 at most Cr at most 1.0; (d) 0.05 at most Si at most 0.3; (e) 0.05 at most Ti at most 0.1; (f) Al at most 0.07; (g) S at most 0.03; (h) P at most 0.05; (i) the remainder being iron and production impurities. The steel has a bainite-martensite structure able to contain up to 5% of ferrite.

Description

Λ Λ
ACIER LAMINE A CHAUD A TRES HAUTE RESISTANCE ET PROCEDEVERY HIGH STRENGTH HOT ROLLED STEEL AND METHOD
DE FABRICATION DE BANDESMANUFACTURING STRIPES
La présente invention concerne un acier laminé à chaud à très haute résistance, et un procédé de fabrication de bandes de cet acier, dont la structure est bainito-martensitique et peut contenir jusqu'à 5% de ferrite.The present invention relates to hot rolled steel with very high resistance, and to a method of manufacturing strips of this steel, the structure of which is bainito-martensitic and can contain up to 5% of ferrite.
Les aciers à très haute résistance ont été développés ces dernières années, notamment afin de répondre aux besoins spécifiques de l'industrie automobile, qui sont en particulier la réduction du poids et donc de l'épaisseur des pièces, et l'amélioration de la sécurité qui passe par l'augmentation de la résistance à la fatigue et de la tenue aux chocs des pièces. Ces améliorations ne doivent en outre pas détériorer l'aptitude à la mise en forme des tôles utilisées pour la fabrication des pièces.Very high strength steels have been developed in recent years, in particular to meet the specific needs of the automotive industry, which are in particular the reduction of the weight and therefore of the thickness of the parts, and the improvement of safety. which involves increasing the resistance to fatigue and the impact resistance of the parts. These improvements must not further deteriorate the formability of the sheets used for the manufacture of the parts.
Cette aptitude à la mise en forme suppose que l'acier présente un allongement A important (> 10%) ainsi qu'un rapport de la limite d'élasticité E sur la résistance à la traction Rm ayant une valeur basse.This formability assumes that the steel has a significant elongation A (> 10%) and a ratio of the elastic limit E to the tensile strength Rm having a low value.
L'amélioration de la tenue aux chocs des pièces mises en forme peut être réalisée de différentes façons et, en particulier, en utilisant des aciers possédant d'une part un allongement A important et, d'autre part, un rapportThe improvement of the impact resistance of shaped parts can be achieved in different ways and, in particular, by using steels having on the one hand a significant elongation A and, on the other hand, a ratio
E/Rm ayant une valeur basse, ce qui permet après mise en forme et grâce à la capacité de consolidation de l'acier d'augmenter sa limite d'élasticité.E / Rm having a low value, which allows after shaping and thanks to the consolidation capacity of the steel to increase its elastic limit.
La tenue en fatigue des pièces définit leur durée de vie en fonction des contraintes subies, et peut être améliorée en augmentant la résistance à la traction Rm de l'acier. Mais, l'augmentation de la résistance détériore l'aptitude à la mise en forme de l'acier, limitant ainsi les pièces réalisables, en particulier en ce qui concerne leur épaisseur.The fatigue resistance of the parts defines their service life according to the stresses undergone, and can be improved by increasing the tensile strength Rm of the steel. However, the increase in strength deteriorates the formability of the steel, thus limiting the workpieces, in particular as regards their thickness.
Par acier à très haute résistance, on désigne dans le cadre de la présente invention, un acier dont la résistance à la traction Rm est supérieure à 800 MPa. On connaît une première famille d'aciers à très haute résistance, qui sont des aciers contenant des proportions élevées de carbone (plus de 0,1 %) et de manganèse (plus de 1 ,2%) et dont la structure est entièrement martensitique. Ils présentent une résistance de plus de 1000 MPa, obtenue par un traitement thermique de trempe, mais ont un allongement A de moins de 8% ce qui interdit toute mise en forme.By very high strength steel is meant in the context of the present invention, a steel whose tensile strength Rm is greater than 800 MPa. A first family of very high strength steels is known, which are steels containing high proportions of carbon (more than 0.1%) and manganese (more than 1.2%) and whose structure is entirely martensitic. They have a resistance of more than 1000 MPa, obtained by a quenching heat treatment, but have an elongation A of less than 8% which prohibits any shaping.
Une deuxième famille d'aciers à très haute résistance est constituée d'aciers dits dual phase, à structure comprenant environ 10% de ferrite et 90% de martensite. Ces aciers présentent une très bonne formabilité, mais des niveaux de résistance ne dépassant pas 800 MPa.A second family of very high strength steels is made up of so-called dual phase steels, with a structure comprising around 10% ferrite and 90% martensite. These steels have very good formability, but resistance levels not exceeding 800 MPa.
Le but de la présente invention est de remédier aux inconvénients des aciers de l'art antérieur en proposant un acier laminé à chaud à très haute résistance, apte à la mise en forme, et présentant une tenue en fatigue et une tenue aux chocs améliorées. A cet effet, l'invention a pour premier objet un acier laminé à chaud à très haute résistance, caractérisé en ce que sa composition chimique comprend, en poids :The object of the present invention is to remedy the drawbacks of the steels of the prior art by proposing a hot-rolled steel with very high resistance, suitable for shaping, and having improved fatigue resistance and impact resistance. For this purpose, the invention has for first object a hot rolled steel with very high resistance, characterized in that its chemical composition comprises, by weight:
0,05% < C < 0,1% 0,7% < Mn < 1 ,1 % 0,5% < Cr < 1 ,0%0.05% <C <0.1% 0.7% <Mn <1.1% 0.5% <Cr <1.0%
0,05% < Si < 0,3% 0,05 < Ti < 0,1 % Al < 0,07 S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration, ledit acier ayant une structure bainito-martensitique pouvant contenir jusqu'à 5% de ferrite. Dans un mode de réalisation préféré, la composition chimique comprend en outre, en poids :0.05% <Si <0.3% 0.05 <Ti <0.1% Al <0.07 S <0.03% P <0.05% the remainder being iron and impurities resulting from production, said steel having a bainito-martensitic structure which may contain up to 5% of ferrite. In a preferred embodiment, the chemical composition also comprises, by weight:
0,08% <C<0,09% 0,8% <Mn<1,0% 0,6% <Cr<0,9%0.08% <C <0.09% 0.8% <Mn <1.0% 0.6% <Cr <0.9%
0,2% < Si < 0,3% 0,05% <Ti<0,09% Al <0,07 S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration. Dans un autre mode de réalisation préféré, la structure de l'acier selon l'invention est constituée de 70 à 90% de bainite, de 10 à 30% de martensite et de 0 à 5% de ferrite, et de façon plus particulièrement préférée, de 70 à 85% de bainite, de 15 à 30% de martensite et de 0 à 5% de ferrite.0.2% <Si <0.3% 0.05% <Ti <0.09% Al <0.07 S <0.03% P <0.05% the remainder being iron and impurities resulting from l development. In another preferred embodiment, the structure of the steel according to the invention consists of 70 to 90% of bainite, 10 to 30% of martensite and 0 to 5% of ferrite, and more particularly preferably , 70 to 85% bainite, 15 to 30% martensite and 0 to 5% ferrite.
L'acier selon l'invention peut également comprendre les caractéristiques suivantes, seules ou en combinaison :The steel according to the invention can also include the following characteristics, alone or in combination:
- une résistance à la traction Rm supérieure ou égale à 950 MPa,- a tensile strength Rm greater than or equal to 950 MPa,
- un allongement à la rupture A supérieur ou égal à 10%,- an elongation at break A greater than or equal to 10%,
- une limite d'élasticité E supérieure ou égale à 680 MPa,- a yield strength E greater than or equal to 680 MPa,
- un rapport E/Rm inférieur à 0,8. L'invention a également pour deuxième objet un procédé de fabrication d'une bande d'acier laminé à chaud à très haute résistance selon l'invention, dans lequel on lamine à chaud une brame dont la composition comprend :- an E / Rm ratio of less than 0.8. The second object of the invention is also a process for manufacturing a strip of hot rolled steel with very high resistance according to the invention, in which a slab is hot rolled, the composition of which comprises:
0,05% <C<0,1% 0,7% Mn<1,1% 0,5% <Cr< 1,0%0.05% <C <0.1% 0.7% Mn <1.1% 0.5% <Cr <1.0%
0,05% Si<0,3%0.05% If <0.3%
0,05 <Ti< 0,1%0.05 <Ti <0.1%
Al < 0,07%Al <0.07%
S < 0,03%S <0.03%
P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration, la température de laminage étant inférieure à 950°C, puis on fait refroidir la bande ainsi obtenue jusqu'à une température inférieure ou égale à 400°C, en maintenant une vitesse de refroidissement supérieure à 50°C/s entre 800 et 700°C, puis on bobine ladite bande à une température de bobinage inférieure ou égale à 250°C.P <0.05% the remainder being iron and impurities resulting from the production, the rolling temperature being less than 950 ° C, then the strip thus obtained is cooled to a temperature less than or equal to 400 ° C, maintaining a cooling rate greater than 50 ° C / s between 800 and 700 ° C, then said strip is wound at a winding temperature less than or equal to 250 ° C.
Dans un mode de réalisation préféré, la composition de la brame est la suivante :In a preferred embodiment, the composition of the slab is as follows:
0,08% < C < 0,09% 0,8% < Mn < 1 ,0% 0,6% < Cr < 0,9%0.08% <C <0.09% 0.8% <Mn <1.0% 0.6% <Cr <0.9%
0,2% < Si < 0,3% 0,05% < Ti < 0,09% Al < 0,07% S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration. Dans un autre mode de réalisation préféré, la bande d'acier laminé à chaud est revêtue de zinc ou d'un alliage de zinc, par immersion dans un bain de zinc ou d'alliage de zinc fondu, à l'issue du bobinage et après avoir été débobinée, puis recuite.0.2% <Si <0.3% 0.05% <Ti <0.09% Al <0.07% S <0.03% P <0.05% the rest being iron and impurities resulting from development. In another preferred embodiment, the strip of hot-rolled steel is coated with zinc or a zinc alloy, by immersion in a bath of zinc or of molten zinc alloy, at the end of the winding and after being unwound and then annealed.
Le procédé selon l'invention consiste tout d'abord à laminer à chaud une brame de composition spécifique, afin d'obtenir une structure homogène. La température de laminage est inférieure à 950°C, et de préférence inférieure à 900°C.The method according to the invention consists first of all in hot rolling a slab of specific composition, in order to obtain a homogeneous structure. The rolling temperature is less than 950 ° C, and preferably less than 900 ° C.
A l'issue du laminage, on fait refroidir la bande ainsi obtenue jusqu'à une température inférieure ou égale à 400°C, en maintenant une vitesse de refroidissement supérieure à 50°C/s entre 800 et 700°C. Ce refroidissement rapide est effectué de telle sorte que l'on forme moins de 5% de ferrite, dont on ne souhaite pas la présence, car le titane précipiterait preferentiellement dans cette phase. Cette vitesse de refroidissement est de préférence comprise entre 50°C/s et 200°C/s. Le procédé consiste ensuite à bobiner la bande à une température de bobinage inférieure ou égale à 250°C. On limite la température de cette étape afin d'éviter de provoquer un revenu de la martensite, qui diminuerait la résistance mécanique et ferait remonter la limite élastique, d'où un mauvais ratio E/Rm.After the rolling, the strip thus obtained is cooled to a temperature less than or equal to 400 ° C, maintaining a cooling rate greater than 50 ° C / s between 800 and 700 ° C. This rapid cooling is carried out so that less than 5% of ferrite is formed, the presence of which is not desired, since the titanium would preferentially precipitate in this phase. This cooling rate is preferably between 50 ° C / s and 200 ° C / s. The method then consists in winding the strip at a winding temperature less than or equal to 250 ° C. We limit the temperature of this step in order to avoid causing an income from martensite, which would decrease the mechanical strength and raise the elastic limit, resulting in a poor E / Rm ratio.
La composition selon l'invention comprend du carbone à une teneur comprise entre 0,05% et 0,100%. Cet élément est essentiel à l'obtention de bonnes caractéristiques mécaniques, mais ne doit pas être présent en trop grande quantité, car il pourrait générer des ségrégations. Une teneur en carbone inférieure à 0,100 permet notamment d'avoir une bonne soudabilité, et une amélioration des propriétés de mise en forme et de limite d'endurance. Elle comprend également du manganèse à une teneur comprise entreThe composition according to the invention comprises carbon at a content of between 0.05% and 0.100%. This element is essential for obtaining good mechanical characteristics, but must not be present in too large a quantity, because it could generate segregations. A carbon content of less than 0.100 makes it possible in particular to have good weldability, and an improvement in shaping properties and endurance limit. It also includes manganese at a content between
0,7% et 1 ,1 %. Le manganèse améliore la limite d'élasticité de l'acier tout en réduisant fortement sa ductilité, ce pour quoi on limite sa teneur. Une teneur inférieure à 1 ,1 % permet également d'éviter toute ségrégation lors de la coulée continue. La composition comprend également du chrome à une teneur comprise entre 0,50% et 1 ,0%. Une teneur minimale de 0,50% permet de favoriser l'apparition de la bainite dans la microstructure. On limite cependant sa teneur à 1 ,0% car une teneur élevée en chrome favoriserait l'augmentation de la quantité de ferrite formée au-delà de 5%, en raison de son caractère alphagène.0.7% and 1.1%. Manganese improves the yield strength of steel while greatly reducing its ductility, which limits its content. A content of less than 1.1% also makes it possible to avoid any segregation during continuous casting. The composition also includes chromium at a content of between 0.50% and 1.0%. A minimum content of 0.50% promotes the appearance of bainite in the microstructure. Its content is however limited to 1.0% since a high chromium content would favor the increase in the amount of ferrite formed beyond 5%, due to its alphagenic character.
La composition comprend également du silicium à une teneur comprise entre 0,05% et 0,3%. Il améliore fortement la limite d'élasticité de l'acier tout en réduisant faiblement sa ductilité et en détériorant sa revêtabilité, ce qui explique pourquoi on limite sa teneur. La composition comprend également du titane à une teneur comprise entre 0,05 et 0,1 %. Cet élément permet d'accroître notablement les caractéristiques mécaniques par un phénomène de précipitation au cours du laminage et du refroidissement. Il n'augmente pas la dureté à chaud du fait de sa teneur modérée. On limite sa teneur à 0,1 % pour éviter de dégrader les propriétés de résistance au choc, la dureté à chaud, ainsi que l'aptitude au pliage.The composition also includes silicon at a content of between 0.05% and 0.3%. It greatly improves the yield strength of steel while slightly reducing its ductility and deteriorating its coatability, which explains why its content is limited. The composition also comprises titanium at a content of between 0.05 and 0.1%. This element makes it possible to significantly increase the mechanical characteristics by a phenomenon of precipitation during rolling and cooling. It does not increase hot hardness due to its moderate content. Its content is limited to 0.1% to avoid degrading the impact resistance properties, the hardness when hot, as well as the ability to fold.
La composition peut également comprendre du phosphore à une teneur inférieure à 0,05%, car au-delà il pourrait poser des problèmes de ségrégation lors de la coulée continue.The composition may also include phosphorus at a content of less than 0.05%, since beyond it could cause problems of segregation during continuous casting.
La composition comprend également de l'aluminium à une teneur comprise inférieure à 0,07%, qui intervient lors du calmage de l'acier lors de son élaboration à l'aciérie. ExemplesThe composition also comprises aluminum with a content of less than 0.07%, which occurs during the calming of the steel during its production at the steelworks. Examples
A titre d'exemple non limitatif, et afin de mieux illustrer l'invention, une nuance d'acier a été élaborée. Sa composition est donnée dans le tableau suivant :By way of nonlimiting example, and in order to better illustrate the invention, a steel grade has been developed. Its composition is given in the following table:
Le reste de la composition est constitué de fer et d'impuretés inévitables résultant de l'élaboration.The rest of the composition consists of iron and unavoidable impurities resulting from processing.
Abréviations employéesAbbreviations used
Rm : résistance à la traction en MPa,Rm: tensile strength in MPa,
Rp0,2 : limite d'élasticité en MPa, A : allongement, mesuré en %Rp0,2: elastic limit in MPa, A: elongation, measured in%
A partir de la nuance A, on a préparé trois échantillons, en les laminant à 860°C, puis en les soumettant à des chemins thermo-mécaniques différents. On a fait varier les vitesses de refroidissement entre 800 et 700°C, ainsi que la température de bobinage, afin de mettre en évidence les différences de structure obtenues.From grade A, three samples were prepared, laminating them to 860 ° C, then subjecting them to different thermomechanical paths. The cooling rates were varied between 800 and 700 ° C, as well as the winding temperature, in order to highlight the differences in structure obtained.
On mesure ensuite les caractéristiques mécaniques des aciers obtenus. Les résultats sont rassemblés dans le tableau suivant :The mechanical properties of the steels obtained are then measured. The results are collated in the following table:
selon l'invention. La microstructure de l'essai 1 , conforme à l'invention, est bainito- martensitique, tandis que la microstructure des essais 2 et 3 est ferrito- bainitique. On constate qu'une vitesse de refroidissement entre 800 et 700C inférieure à 50°C/s, induit une présence de ferrite dans une proportion supérieure à 5%. Le titane va alors précipiter dans cette ferrite, ce qui ne permet plus d'obtenir le niveau de caractéristiques mécaniques recherché, en particulier un Rm élevé. Par ailleurs, une température de bobinage supérieure à 250°C, associée à une vitesse de refroidissement entre 800 et 700°C inférieure à 50°C/s, augmente la limite d'élasticité sans augmenter la résistance mécanique. Le rapport E/Rm est donc trop élevé. according to the invention. The microstructure of test 1, according to the invention, is bainitomartensitic, while the microstructure of tests 2 and 3 is ferrito-martensitic. It is found that a cooling rate between 800 and 700C of less than 50 ° C / s, induces the presence of ferrite in a proportion greater than 5%. The titanium will then precipitate in this ferrite, which no longer makes it possible to obtain the level of mechanical characteristics sought, in particular a high Rm. Furthermore, a winding temperature above 250 ° C, associated with a cooling rate between 800 and 700 ° C below 50 ° C / s, increases the elastic limit without increasing the mechanical strength. The E / Rm ratio is therefore too high.
Enfin, on constate qu'une vitesse de refroidissement entre 800 et 700°C supérieure à 50°C/s, associée à une température de bobinage inférieure à 250°C, donne d'excellentes valeurs de résistance mécanique et de limite d'élasticité. La structure essentiellement bainito-martensitique confère au produit un bon ratio E/Rm et un allongement supérieur à 10%.Finally, it is found that a cooling rate between 800 and 700 ° C greater than 50 ° C / s, associated with a winding temperature less than 250 ° C, gives excellent values of mechanical resistance and elastic limit . The essentially bainito-martensitic structure gives the product a good E / Rm ratio and an elongation greater than 10%.
En outre, l'acier selon l'invention présente une bonne aptitude au revêtement par immersion dans un bain de métal fondu, tel que du zinc ou un alliage de zinc, ou que de l'aluminium ou un de ses alliages. In addition, the steel according to the invention has a good ability to be coated by immersion in a bath of molten metal, such as zinc or a zinc alloy, or only aluminum or one of its alloys.

Claims

REVENDICATIONS
1. Acier laminé à chaud à très haute résistance, caractérisé en ce que sa composition chimique comprend, en poids : 0,05% <C<0,1%1. Very high strength hot rolled steel, characterized in that its chemical composition comprises, by weight: 0.05% <C <0.1%
0,7% <Mn<1,1% 0,5% <Cr<1,0% 0,05% <Si<0,3% 0,05 <Ti< 0,1% Al < 0,070.7% <Mn <1.1% 0.5% <Cr <1.0% 0.05% <Si <0.3% 0.05 <Ti <0.1% Al <0.07
S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration, ledit acier ayant une structure bainito-martensitique pouvant contenir jusqu'à 5% de ferrite.S <0.03% P <0.05% the remainder being iron and impurities resulting from the production, said steel having a bainito-martensitic structure which may contain up to 5% ferrite.
2. Acier selon la revendication 1, caractérisé en ce que sa composition comprend en outre :2. Steel according to claim 1, characterized in that its composition further comprises:
0,08% <C<0,09% 0,8% <Mn<1,0% 0,6% <Cr<0,9% 0,2% <Si<0,3% 0,05% < Ti < 0,09%0.08% <C <0.09% 0.8% <Mn <1.0% 0.6% <Cr <0.9% 0.2% <Si <0.3% 0.05% <Ti <0.09%
Al < 0,07 S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration, ledit acier ayant une structure bainito-martensitique pouvant contenir jusqu'à 5% de ferrite. Al <0.07 S <0.03% P <0.05% the remainder being iron and impurities resulting from the production, said steel having a bainito-martensitic structure which may contain up to 5% of ferrite.
3. Acier selon l'une ou l'autre des revendications 1 ou 2, caractérisé en outre en ce que sa structure est constituée de 70 à 90% de bainite, de 10 à 30% de martensite et de 0 à 5% de ferrite. 3. Steel according to either of claims 1 or 2, further characterized in that its structure consists of 70 to 90% bainite, 10 to 30% martensite and 0 to 5% ferrite .
4. Acier selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il présente une résistance à la traction Rm supérieure ou égale à 950MPa.4. Steel according to any one of claims 1 to 3, characterized in that it has a tensile strength Rm greater than or equal to 950MPa.
5. Acier selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il présente un allongement à la rupture A supérieur ou égal à 10%.5. Steel according to any one of claims 1 to 4, characterized in that it has an elongation at break A greater than or equal to 10%.
6. Acier selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il présente une limite d'élasticité E supérieure ou égale à 680 MPa.6. Steel according to any one of claims 1 to 5, characterized in that it has an elastic limit E greater than or equal to 680 MPa.
7. Acier selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il présente un rapport E/Rm inférieur à 0,8. 7. Steel according to any one of claims 1 to 6, characterized in that it has an E / Rm ratio of less than 0.8.
8. Procédé de fabrication d'une bande d'acier laminé à chaud à très haute résistance selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on lamine à chaud une brame dont la composition comprend :8. A method of manufacturing a very high strength hot rolled steel strip according to any one of claims 1 to 7, characterized in that a slab is hot rolled, the composition of which comprises:
0,05% < C < 0,1 % 0,7% < Mn < 1 ,1 % 0,5% < Cr < 1 ,0%0.05% <C <0.1% 0.7% <Mn <1.1% 0.5% <Cr <1.0%
0,05% < Si < 0,3% 0,05 <Ti < 0,1 % Al < 0,07 S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration, la température de laminage étant inférieure à 950°C, puis on fait refroidir la bande ainsi obtenue jusqu'à une température inférieure ou égale à 400°C, en maintenant une vitesse de refroidissement supérieure à 50°C/s entre 800 et 700°C, puis on bobine ladite bande à une température de bobinage inférieure ou égale à 250°C. 0.05% <Si <0.3% 0.05 <Ti <0.1% Al <0.07 S <0.03% P <0.05% the remainder being iron and impurities resulting from preparation, the rolling temperature being less than 950 ° C., then the strip thus obtained is made to cool to a temperature less than or equal to 400 ° C., maintaining a cooling rate greater than 50 ° C./s between 800 and 700 ° C, then said strip is wound at a winding temperature less than or equal to 250 ° C.
9. Procédé de fabrication selon la revendication 8, caractérisé en outre en ce que l'on lamine à chaud une brame dont la composition comprend :9. The manufacturing method according to claim 8, further characterized in that a slab is hot rolled, the composition of which comprises:
0,08% < C < 0,09% 0,8% < Mn < 1 ,0% 0,6% < Cr < 0,9% 0,2% < Si < 0,3%0.08% <C <0.09% 0.8% <Mn <1.0% 0.6% <Cr <0.9% 0.2% <Si <0.3%
0,05% < Ti < 0,09% Al < 0,07 S < 0,03% P < 0,05% le reste étant du fer et des impuretés résultant de l'élaboration. 0.05% <Ti <0.09% Al <0.07 S <0.03% P <0.05% the remainder being iron and impurities resulting from the production.
10. Procédé de fabrication selon l'une ou l'autre des revendications 8 ou 9, caractérisé en ce que la bande d'acier laminé à chaud est revêtue de zinc ou d'un alliage de zinc, par immersion dans un bain de zinc ou d'alliage de zinc fondu, à l'issue dudit bobinage et après avoir été débobinée, puis recuite. 10. Manufacturing method according to either of claims 8 or 9, characterized in that the hot rolled steel strip is coated with zinc or a zinc alloy, by immersion in a zinc bath or of molten zinc alloy, at the end of said winding and after having been unwound and then annealed.
EP04701978A 2003-01-15 2004-01-14 Ultrahigh strength hot-rolled steel and method of producing bands Expired - Lifetime EP1587963B1 (en)

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FR0300371A FR2849864B1 (en) 2003-01-15 2003-01-15 VERY HIGH STRENGTH HOT-ROLLED STEEL AND METHOD OF MANUFACTURING STRIPS
FR0300371 2003-01-15
PCT/FR2004/000058 WO2004070064A2 (en) 2003-01-15 2004-01-14 Ultrahigh strength hot-rolled steel and method of producing bands

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PL2631314T3 (en) * 2010-10-18 2020-03-31 Nippon Steel Corporation Hot-rolled, cold-rolled, and plated steel sheet having improved uniform and local ductility at a high strain rate
WO2012153008A1 (en) 2011-05-12 2012-11-15 Arcelormittal Investigación Y Desarrollo Sl Method for the production of very-high-strength martensitic steel and sheet or part thus obtained
WO2012153009A1 (en) * 2011-05-12 2012-11-15 Arcelormittal Investigación Y Desarrollo Sl Method for the production of very-high-strength martensitic steel and sheet thus obtained
CN102560272B (en) * 2011-11-25 2014-01-22 宝山钢铁股份有限公司 Ultrahigh-strength abrasion-resistant steel plate and manufacturing method thereof
CN104520449B (en) * 2012-08-03 2016-12-14 塔塔钢铁艾默伊登有限责任公司 A kind of method for producing hot rolled strip and the steel band thus produced
CN103695762B (en) * 2013-12-13 2016-06-08 安徽工业大学 A kind of tensile strength 560��590MPa hot rolled wheel rim steel and manufacture method thereof
PL3097214T3 (en) * 2014-01-24 2021-07-05 Rautaruukki Oyj Hot-rolled ultrahigh strength steel strip product
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KR102020435B1 (en) 2017-12-22 2019-09-10 주식회사 포스코 High strength hot-rolled steel sheet having excellent bendability and low-temperature toughness and mathod for manufacturing thereof
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FR2849864A1 (en) 2004-07-16
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KR20050090458A (en) 2005-09-13
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