EP0764725A1 - Process for making a metallic strip for packages and metallic packages made by this process - Google Patents
Process for making a metallic strip for packages and metallic packages made by this process Download PDFInfo
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- EP0764725A1 EP0764725A1 EP96401861A EP96401861A EP0764725A1 EP 0764725 A1 EP0764725 A1 EP 0764725A1 EP 96401861 A EP96401861 A EP 96401861A EP 96401861 A EP96401861 A EP 96401861A EP 0764725 A1 EP0764725 A1 EP 0764725A1
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- Prior art keywords
- strip
- steel
- produced
- cold
- rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties 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
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
Definitions
- the present invention relates to a method of manufacturing a thin metal strip intended for producing a metallic packaging of the type of food boxes.
- the present invention also relates to a metallic packaging produced from a thin metallic strip of steel obtained by this process.
- Metal packaging of the food box type is generally produced in two pieces or in three pieces.
- three-piece boxes they consist of a body, generally a longitudinally welded ferrule, often molded, on which are crimped two lids, also called bottoms, one of which can be easily opened.
- cover or lids In both cases, the cover or lids generally have steps to increase their rigidity.
- the covers of food boxes as well as the bodies in the case of three-piece boxes are most often made from steel whose mechanical characteristics and in particular the elastic limit Re and the tensile strength Rm must be high to ensure good mechanical strength of the box and good resistance of the cover to internal pressure, during sterilization of the box.
- manufacturers of food boxes in order to save money and to reduce weight, seek to reduce the thickness of the walls of the boxes. boxes and in particular the thickness of the cover while retaining the same mechanical characteristics, or even increasing them.
- the hot strip is cold rolled, then undergoes recrystallization annealing at a temperature below Ac1 and then cold re-rolled.
- this steel makes it possible to manufacture them from metal blanks with a thickness of 0.25mm, or even 0.23mm.
- This increase in mechanical characteristics can be obtained by increasing the reduction rate of cold rolling.
- the object of the present invention is to avoid these drawbacks, that is to say to provide a steel which either has the same mechanical characteristics (in particular Re, Rm) as the prior art, but which has a improved ductility in order to be able to more easily form the stiffening steps on the cover and the moldings on the body, avoiding the problems of necking of the material, or having superior mechanical characteristics (in particular Re, Rm) without degrading the ductility.
- the subject of the invention is also a two or three-piece metal packaging, characterized in that it is produced from a thin metal strip obtained by the process mentioned above.
- This steel is produced in a steelworks converter and refined in a ladle.
- the hot strip is produced by rolling with hot from a slab of continuous casting or produced by direct casting between cylinders.
- the important characteristics of this process lie in the fact that the nitrogen content is between 8 and 16.10 -3 % and that a cold re-rolling is carried out after annealing the strip at a reduction rate greater than 10%, preferably 20%.
- the nitrogen content is ensured by adding a pocket of calcium cyanamide during the production of the steel or is ensured by blowing nitrogen gas at the end of the production of the steel when it is laid down.
- the advantage of adding nitrogen is to harden the steel by the effect of a solid solution.
- steels A, B and I being steels with low nitrogen content, that is to say with a nitrogen content of between 4 and 6.10 -3 % and steels C, D, E, F, G and H being steels with a higher nitrogen content, that is to say with a nitrogen content of between 8 and 16.10 -3 %.
- steels A and B having a low nitrogen content respectively 5.3.10 -3 % and 5.7.10 -3 % and satisfying the rolling conditions of the process according to the invention, have a limit elasticity Re, of 570 MPa and 580 MPa respectively, a tensile strength Rm of 585 MPa and 600 MPa and an elongation at break A% of 0.3% and 0.2%.
- steel C having a nitrogen content of 10.9.10 -3 % higher than steels A and B and having undergone very low cold rolling with a reduction rate of 2.5%, has weak mechanical characteristics and in particular an elastic limit Re of 445 MPa and a tensile strength Rm of 475 MPa.
- Steel C can therefore easily be stamped given its high elongation at break, but will not have sufficient resistance to internal pressure and the cover will not resist.
- Steel I makes it possible to obtain a yield strength identical to that of steel H, but by carrying out a much higher rate of cold rolling. However, the elongation at break of this steel is equal to 0, which makes it incapable of deformation.
- the mechanical characteristics can be increased, while retaining the same elongation at break, or the same mechanical characteristics can be preserved and the elongation at break increased, which makes it possible to more easily form the steps on the bottom or the cover , the moldings on the body and to avoid the phenomena of necking of the material and also to have a better resistance of the box to the internal pressure.
- the addition of nitrogen accelerates the hardening of the steel by aging, which can be used to increase the mechanical strength of the cover by natural aging or by raising the temperature during, for example, the sterilization of the box.
- the method according to the invention gives flexibility in terms of the rate of reduction of cold rolling which facilitates the reduction in the thickness of the lid or of the body of the boxes because it is thus possible to offer steels having higher mechanical strength and having good deformability.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
La présente invention a pour objet un procédé de fabrication d'une bande métallique mince destinée à la réalisation d'un emballage métallique du type de boîtes alimentaires.The present invention relates to a method of manufacturing a thin metal strip intended for producing a metallic packaging of the type of food boxes.
La présente invention a également pour objet un emballage métallique réalisé à partir d'une bande métallique mince en acier obtenue par ce procédé.The present invention also relates to a metallic packaging produced from a thin metallic strip of steel obtained by this process.
Les emballages métalliques du type boîtes alimentaires sont généralement réalisés en deux pièces ou en trois pièces.Metal packaging of the food box type is generally produced in two pieces or in three pieces.
Dans le cas des boîtes deux pièces, elles comportent un corps constitué d'un fond et d'une jupe périphérique, sur lequel est serti un couvercle, qui peut être à ouverture facile.In the case of two-piece boxes, they have a body consisting of a bottom and a peripheral skirt, on which a cover is crimped, which can be easy to open.
Dans le cas de boîtes trois pièces, elles sont constituées d'un corps, généralement une virole soudée longitudinalement, souvent moulurée, sur lequel sont sertis deux couvercles, encore appelés fonds, dont l'un peut être à ouverture facile.In the case of three-piece boxes, they consist of a body, generally a longitudinally welded ferrule, often molded, on which are crimped two lids, also called bottoms, one of which can be easily opened.
Dans les deux cas, le couvercle ou les couvercles comportent généralement des gradins pour augmenter leur rigidité.In both cases, the cover or lids generally have steps to increase their rigidity.
Les couvercles de boîtes alimentaires ainsi que les corps dans le cas des boîtes trois pièces, sont réalisés le plus souvent à partir d'acier dont les caractéristiques mécaniques et en particulier la limite d'élasticité Re et la résistance à la traction Rm doivent être élevées afin d'assurer une bonne tenue mécanique de la boîte et une bonne résistance du couvercle à la pression interne, lors de la stérilisation de la boîte.The covers of food boxes as well as the bodies in the case of three-piece boxes, are most often made from steel whose mechanical characteristics and in particular the elastic limit Re and the tensile strength Rm must be high to ensure good mechanical strength of the box and good resistance of the cover to internal pressure, during sterilization of the box.
Par ailleurs, les fabricants de boîtes alimentaires, dans un soucis d'économie et pour diminuer le poids cherchent à diminuer l'épaisseur des parois des boîtes et notamment l'épaisseur du couvercle tout en conservant les mêmes caractéristiques mécaniques, voire en les augmentant.In addition, manufacturers of food boxes, in order to save money and to reduce weight, seek to reduce the thickness of the walls of the boxes. boxes and in particular the thickness of the cover while retaining the same mechanical characteristics, or even increasing them.
La tendance actuelle est de réaliser des couvercles à partir de flans de plus en plus minces d'épaisseur de l'ordre de 0,20mm voire de 0,18mm, et des corps à partir de flans métalliques de l'ordre de 0,14mm dans le cas des boîtes trois pièces.The current trend is to make covers from increasingly thinner blanks of the order of 0.20mm or even 0.18mm, and bodies from metal blanks of the order of 0.14mm in the case of three-piece boxes.
Pour réaliser des boîtes alimentaires, il est connu de réaliser une bande à chaud à partir d'un acier calmé aluminium dont la composition pondérale est la suivante :
- Carbone compris entre 50 et 80.10-3%,
- Aluminium compris entre 40 et 70.10-3%,
- Azote compris entre 4 et 6.10-3%,
- Manganèse compris entre 200 et 450.10-3%.
- Carbon between 50 and 80.10 -3 %,
- Aluminum between 40 and 70.10 -3 %,
- Nitrogen between 4 and 6.10 -3 %,
- Manganese between 200 and 450.10 -3 %.
La bande à chaud est laminée à froid, puis subit un recuit de recristallisation à une température inférieure à Ac1 et ensuite relaminée à froid.The hot strip is cold rolled, then undergoes recrystallization annealing at a temperature below Ac1 and then cold re-rolled.
Un tel acier ayant une teneur en azote de l'ordre de 4 à 6.10-3% présente après avoir subi un recuit continu, puis un relaminage à froid avec un taux de réduction de l'ordre de 25%, des caractéristiques mécaniques relativement élevées et notamment une résistance à la traction Rm de l'ordre 620 MPa.Such a steel having a nitrogen content of the order of 4 to 6.10 -3 % present after having undergone continuous annealing, then cold re-rolling with a reduction rate of the order of 25%, relatively high mechanical characteristics and in particular a tensile strength Rm of the order of 620 MPa.
Concernant les couvercles, cet acier permet de les fabriquer à partir de flans métalliques d'épaisseur de 0,25mm, voire de 0,23mm.Regarding the covers, this steel makes it possible to manufacture them from metal blanks with a thickness of 0.25mm, or even 0.23mm.
En effet, sa résistance mécanique est suffisamment élevée pour assurer la tenue mécanique du couvercle, en particulier sa tenue à la pression interne lors de la stérilisation et/ou la pasteurisation de la boîte.Indeed, its mechanical strength is high enough to ensure the mechanical strength of the lid, in particular its resistance to internal pressure during sterilization and / or pasteurization of the box.
De plus, un tel acier présente une ductilité satisfaisante permettant de réaliser les gradins de rigidification par emboutissage.In addition, such a steel has a satisfactory ductility allowing the steps of stiffening by stamping.
Lorsque l'on cherche à diminuer l'épaisseur du couvercle, il est nécessaire d'acroître les caractéristiques mécaniques du matériau, en particulier la limite d'élasticité Re et la charge maximale à la rupture Rm, afin de conférer au couvercle la même résistance qu'auparavant, mais avec une épaisseur moindre.When trying to reduce the thickness of the cover, it is necessary to increase the mechanical characteristics of the material, in particular the elastic limit Re and the maximum breaking load Rm, in order to give the cover the same resistance than before, but with a reduced thickness.
Cet accroissement des caractéristiques mécaniques peut s'obtenir en augmentant le taux de réduction du relaminage à froid.This increase in mechanical characteristics can be obtained by increasing the reduction rate of cold rolling.
Mais cette opération a pour conséquence néfaste de dégrader la ductilité du matériau ce qui entraîne une difficulté par exemple pour emboutir le couvercle, en particulier pour former les gradins de rigidification, ou par exemple pour la réalisation des moulures sur le corps de la boîte.However, this operation has the harmful consequence of degrading the ductility of the material, which causes difficulty, for example, in stamping the cover, in particular for forming the stiffening steps, or for example in the production of moldings on the body of the box.
En effet, il peut apparaître des strictions localisées dans les gradins du fond ou les moulures du corps de boîte, par manque de ductilité du métal ce qui entraîne une diminution de la résistance de l'emballage à la mise en pression lors de la stérilisation ou lors de l'empilage des emballages.Indeed, there may appear localized neckings in the steps of the bottom or the moldings of the box body, for lack of ductility of the metal which leads to a reduction in the resistance of the packaging to pressurization during sterilization or when stacking the packaging.
La présente invention a pour but d'éviter ces inconvénients, c'est-à-dire de proposer un acier qui, soit présente les mêmes caractéristiques mécaniques (en particulier Re, Rm) que l'état de la technique, mais qui présente une ductilité améliorée afin de pouvoir former plus facilement les gradins de rigidification sur le couvercle et les moulures sur le corps en évitant les problèmes de striction du matériau, soit présente des caractéristiques mécaniques (en particulier Re, Rm) supérieures sans dégrader la ductilité.The object of the present invention is to avoid these drawbacks, that is to say to provide a steel which either has the same mechanical characteristics (in particular Re, Rm) as the prior art, but which has a improved ductility in order to be able to more easily form the stiffening steps on the cover and the moldings on the body, avoiding the problems of necking of the material, or having superior mechanical characteristics (in particular Re, Rm) without degrading the ductility.
L'invention a donc pour objet un procédé de fabrication d'une bande métallique mince destinée à la réalisation d'un emballage métallique du type boîtes alimentaires, caractérisé en ce que :
- on réalise une bande à chaud à partir d'un acier ayant la composition pondérale suivante :
- Carbone compris entre 50 et 80.10-3%,
- Manganèse compris entre 200 et 450.10-3%,
- Aluminium inférieur à 20.10-3%,
- Azote compris entre 8 et 16.10-3%,
- Phosphore inférieur à 20.10-3%,
- Soufre inférieur à 20.10-3%,
- Silicium inférieur à 20.10-3%,
- le reste étant du fer et des éléments résiduels,
- on effectue un laminage à froid de cette bande à chaud,
- on effectue un recuit de recristallisation à une température inférieure à Ac1,
- et on effectue un relaminage à froid de la bande à un taux de réduction supérieur à 10%, de préférence 20%.
- a hot strip is produced from a steel having the following composition by weight:
- Carbon between 50 and 80.10 -3 %,
- Manganese between 200 and 450.10 -3 %,
- Aluminum less than 20.10 -3 %,
- Nitrogen between 8 and 16.10 -3 %,
- Phosphorus below 20.10 -3 %,
- Sulfur less than 20.10 -3 %,
- Silicon less than 20.10 -3 %,
- the rest being iron and residual elements,
- a cold rolling of this strip is carried out,
- recrystallization annealing is carried out at a temperature below Ac1,
- and a cold re-rolling of the strip is carried out at a reduction rate greater than 10%, preferably 20%.
Selon d'autres caractéristiques de l'invention :
- l'acier est élaboré dans un convertisseur d'aciérie et affiné en poche,
- on assure la teneur en azote par un ajout en poche de cyanamide calcique lors de l'élaboration de l'acier,
- on assure la teneur en azote par soufflage d'azote gazeux en fin d'élaboration de l'acier lors de sa mise à nuance,
- on réalise la bande à chaud par laminage à chaud d'une brame de coulée continue,
- on réalise la bande à chaud par coulée directe entre cylindres,
- on effectue le relaminage à froid de la bande à un taux de réduction compris entre 10 et 40%, de préférence entre 20 et 30%.
- the steel is produced in a steelworks converter and refined in a ladle,
- the nitrogen content is ensured by adding a pocket of calcium cyanamide during the production of the steel,
- the nitrogen content is ensured by blowing nitrogen gas at the end of the production of the steel when it is laid down,
- the hot strip is produced by hot rolling of a continuous casting slab,
- the hot strip is produced by direct casting between cylinders,
- cold re-rolling of the strip is carried out at a reduction rate of between 10 and 40%, preferably between 20 and 30%.
L'invention a également pour objet un emballage métallique deux ou trois pièces, caractérisé en ce qu'il est fabriqué à partir d'une bande métallique mince obtenue par le procédé mentionné ci-dessus.The subject of the invention is also a two or three-piece metal packaging, characterized in that it is produced from a thin metal strip obtained by the process mentioned above.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple.The invention will be better understood on reading the description which follows, given solely by way of example.
L'invention concerne un procédé de fabrication d'une bande métallique mince destinée à la réalisation d'un emballage métallique du type boîtes alimentaires, dans lequel:
- on réalise une bande à chaud à partir d'un acier ayant la composition pondérale suivante :
- Carbone compris entre 50 et 80.10-3%,
- Manganèse compris entre 200 et 450.10-3%,
- Aluminium inférieur à 20.10-3%,
- Azote compris entre 8 et 16.10-3%,
- Phosphore intérieur à 20.10-3%,
- Soufre inférieur à 20.10-3%,
- Silicium inférieur à 20.10-3%,
- le reste étant du fer et des éléments résiduels,
- on effectue un laminage à froid de cette bande à chaud,
- on effectue un recuit de recristallisation à une température inférieure à Ac1, de préférence un recuit continu,
- et on effectue un relaminage à froid de la bande à un taux de réduction supérieur à 10% et de préférence supérieur à 20%, généralement compris entre 20 et 30%.
- a hot strip is produced from a steel having the following composition by weight:
- Carbon between 50 and 80.10 -3 %,
- Manganese between 200 and 450.10 -3 %,
- Aluminum less than 20.10 -3 %,
- Nitrogen between 8 and 16.10 -3 %,
- Indoor phosphorus at 20.10 -3 %,
- Sulfur less than 20.10 -3 %,
- Silicon less than 20.10 -3 %,
- the rest being iron and residual elements,
- a cold rolling of this strip is carried out,
- recrystallization annealing is carried out at a temperature below Ac1, preferably continuous annealing,
- and a cold re-rolling of the strip is carried out at a reduction rate greater than 10% and preferably greater than 20%, generally between 20 and 30%.
Cet acier est élaboré dans un convertisseur d'aciérie et affiné en poche.This steel is produced in a steelworks converter and refined in a ladle.
La bande à chaud est élaborée par laminage à chaud d'une brame de coulée continue ou élaborée par coulée directe entre cylindres.The hot strip is produced by rolling with hot from a slab of continuous casting or produced by direct casting between cylinders.
Les caractéristiques importantes de ce procédé résident dans le fait que la teneur en azote est comprise entre 8 et 16.10-3% et que l'on effectue un relaminage à froid après recuit de la bande à un taux de réduction supérieur à 10%, de préférence 20%.The important characteristics of this process lie in the fact that the nitrogen content is between 8 and 16.10 -3 % and that a cold re-rolling is carried out after annealing the strip at a reduction rate greater than 10%, preferably 20%.
La teneur en azote est assurée par ajout en poche de cyanamide calcique lors de l'élaboration de l'acier ou est assurée par soufflage d'azote gazeux en fin d'élaboration de l'acier lors de sa mise à nuance.The nitrogen content is ensured by adding a pocket of calcium cyanamide during the production of the steel or is ensured by blowing nitrogen gas at the end of the production of the steel when it is laid down.
L'intérêt de l'ajout de l'azote est de durcir l'acier par effet de solution solide.The advantage of adding nitrogen is to harden the steel by the effect of a solid solution.
Grâce à cet ajout d'azote pour obtenir dans l'acier une teneur en azote comprise entre 8 et 16.10-3%, il est possible, par rapport aux procédés de fabrication selon l'état de la technique avec des aciers possédant une teneur en azote comprise entre 4 et 6.10-3% d'azote, de ne pas augmenter le taux de relaminage à froid, tout en augmentant les caractéristiques mécaniques et en obtenant sensiblement la même ductilité ou de diminuer le taux de relaminage à froid pour conserver les mêmes caractéristiques, mais en obtenant une ductilité plus importante.Thanks to this addition of nitrogen to obtain in the steel a nitrogen content of between 8 and 16.10 -3 %, it is possible, compared to the manufacturing processes according to the prior art with steels having a content of nitrogen between 4 and 6.10 -3 % nitrogen, not to increase the rate of cold rolling, while increasing the mechanical characteristics and obtaining substantially the same ductility or to decrease the rate of cold rolling to keep the same characteristics, but obtaining a higher ductility.
Plusieurs essais ont été réalisés permettant de montrer l'intérêt du procédé selon l'invention.Several tests have been carried out making it possible to show the advantage of the method according to the invention.
Dans le tableau ci-dessous, différentes compositions d'aciers sont indiquées, les aciers A, B et I étant des aciers à faible teneur en azote, c'est à dire avec une teneur en azote comprise entre 4 et 6.10-3% et les aciers C, D, E, F, G et H étant des aciers à plus forte teneur en azote, c'est à dire avec une teneur en azote comprise entre 8 et 16.10-3%.In the table below, different steel compositions are indicated, steels A, B and I being steels with low nitrogen content, that is to say with a nitrogen content of between 4 and 6.10 -3 % and steels C, D, E, F, G and H being steels with a higher nitrogen content, that is to say with a nitrogen content of between 8 and 16.10 -3 %.
A partir de ces aciers, on a réalisé des bandes à chaud et on a effectué un laminage à froid de ces bandes à chaud, puis un recuit continu de recristallisation à une température inférieure à Ac1 et enfin un relaminage à froid des bandes.From these steels, hot strips were produced and cold rolling was carried out. these strips hot, then a continuous recrystallization annealing at a temperature below Ac1 and finally a cold re-rolling of the strips.
Pour caractériser la ductilité, les essais ont été effectués en déterminant l'allongement à la rupture A%.
On constate dans ce tableau que les aciers A et B possédant une faible teneur en azote, respectivement de 5,3.10-3% et de 5,7.10-3% et satisfaisant aux conditions de laminage du procédé selon l'invention, présentent une limite d'élasticité Re, respectivement de 570 MPa et de 580 MPa, une résistance à la traction Rm de 585 MPa et de 600 MPa et un allongement à la rupture A% de 0,3% et de 0,2%.It can be seen in this table that steels A and B having a low nitrogen content, respectively 5.3.10 -3 % and 5.7.10 -3 % and satisfying the rolling conditions of the process according to the invention, have a limit elasticity Re, of 570 MPa and 580 MPa respectively, a tensile strength Rm of 585 MPa and 600 MPa and an elongation at break A% of 0.3% and 0.2%.
Par contre, l'acier C possédant une teneur en azote de 10,9.10-3% supérieure aux aciers A et B et ayant subi un relaminage à froid très faible avec un taux de réduction de 2,5%, présente des caractéristiques mécaniques faibles et notamment une limite d'élasticité Re de 445 MPa et une résistance à la traction Rm de 475 MPa.On the other hand, steel C having a nitrogen content of 10.9.10 -3 % higher than steels A and B and having undergone very low cold rolling with a reduction rate of 2.5%, has weak mechanical characteristics and in particular an elastic limit Re of 445 MPa and a tensile strength Rm of 475 MPa.
L'allongement à la rupture A% de l'acier C est par contre élevé et égal à 14%.On the other hand, the elongation at break A% of steel C is high and equal to 14%.
L'acier C pourra donc facilement être embouti compte tenu de son allongement à la rupture élevé, mais ne présentera pas une résistance à la pression interne suffisante et le couvercle ne résistera pas.Steel C can therefore easily be stamped given its high elongation at break, but will not have sufficient resistance to internal pressure and the cover will not resist.
Avec les aciers D, E, F, G et H on voit que pour une teneur en azote élevée comprise entre 10 et 15.10-3% et ayant subi un relaminage à froid avec un taux de réduction variant de 10 à 32%, on augmente les caractéristiques mécaniques tout en ayant un allongement à la rupture A% qui est de 0,7% pour l'acier D, de 0,3% pour l'acier E, de 0,2% pour l'acier F, de 5,0% pour l'acier G, et de 0,8% pour l'acier H.With steels D, E, F, G and H we see that for a high nitrogen content of between 10 and 15.10 -3 % and having undergone cold re-rolling with a reduction rate varying from 10 to 32%, we increase mechanical characteristics while having an elongation at break A% which is 0.7% for steel D, 0.3% for steel E, 0.2% for steel F, 5 , 0% for steel G, and 0.8% for steel H.
L'acier I permet d'obtenir une limite d'élasticité identique à celle de l'acier H, mais en réalisant un taux de relaminage à froid très supérieur. Mais, l'allongement à la rupture de cet acier est égal à 0 ce qui le rend inapte à la déformation.Steel I makes it possible to obtain a yield strength identical to that of steel H, but by carrying out a much higher rate of cold rolling. However, the elongation at break of this steel is equal to 0, which makes it incapable of deformation.
Par conséquent, en trouvant un compromis satisfaisant entre la teneur en azote et le taux de relaminage à froid, on peut augmenter les caractéristiques mécaniques, tout en conservant le même allongement à la rupture ou conserver les mêmes caractéristiques mécaniques et augmenter l'allongement à la rupture ce qui permet de pouvoir former plus facilement les gradins sur le fond ou le couvercle, les moulures sur le corps et d'éviter les phénomènes de striction du matériau et également d'avoir une meilleure résistance de la boîte à la pression interne.Consequently, by finding a satisfactory compromise between the nitrogen content and the rate of cold rolling, the mechanical characteristics can be increased, while retaining the same elongation at break, or the same mechanical characteristics can be preserved and the elongation at break increased, which makes it possible to more easily form the steps on the bottom or the cover , the moldings on the body and to avoid the phenomena of necking of the material and also to have a better resistance of the box to the internal pressure.
Par ailleurs, l'ajout d'azote accélère le durcissement de l'acier par vieillissement ce qui peut être mis à profit pour augmenter la tenue mécanique du couvercle par vieillissement naturel ou par une élévation de la température lors par exemple de la stérilisation de la boîte.Furthermore, the addition of nitrogen accelerates the hardening of the steel by aging, which can be used to increase the mechanical strength of the cover by natural aging or by raising the temperature during, for example, the sterilization of the box.
Ainsi, le procédé selon l'invention donne de la souplesse au niveau du taux de réduction du relaminage à froid ce qui facilite la diminution de l'épaisseur du couvercle ou du corps des boîtes du fait qu'il est ainsi possible de proposer des aciers possédant une résistance mécanique plus élevée et ayant une bonne aptitude à la déformation.Thus, the method according to the invention gives flexibility in terms of the rate of reduction of cold rolling which facilitates the reduction in the thickness of the lid or of the body of the boxes because it is thus possible to offer steels having higher mechanical strength and having good deformability.
Claims (9)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9511113 | 1995-09-21 | ||
| FR9511113A FR2739105B1 (en) | 1995-09-21 | 1995-09-21 | METHOD FOR MANUFACTURING A METAL STRIP FOR PACKAGINGS AND METAL PACKAGES OBTAINED BY THIS PROCESS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0764725A1 true EP0764725A1 (en) | 1997-03-26 |
Family
ID=9482811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96401861A Withdrawn EP0764725A1 (en) | 1995-09-21 | 1996-08-29 | Process for making a metallic strip for packages and metallic packages made by this process |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0764725A1 (en) |
| FR (1) | FR2739105B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1065282A1 (en) * | 1999-07-01 | 2001-01-03 | Sollac | Low aluminum steel sheet for cans |
| EP1065286A1 (en) * | 1999-07-01 | 2001-01-03 | Sollac S.A. | Low aluminum steel sheet for cans |
| EP3186401B1 (en) | 2014-08-27 | 2019-06-12 | ThyssenKrupp Rasselstein GmbH | Method of manufacturing of a nitrided packaging steel |
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|---|---|---|---|---|
| US2444788A (en) * | 1945-02-21 | 1948-07-06 | Carnegie Illinois Steel Corp | Steel strip tempering |
| DE1132168B (en) * | 1960-07-18 | 1962-06-28 | Mannesmann Ag | Process for the production of nitrogen-containing unalloyed or low-alloy steels |
| US4081270A (en) * | 1977-04-11 | 1978-03-28 | Union Carbide Corporation | Renitrogenation of basic-oxygen steels during decarburization |
| US4596608A (en) * | 1985-04-15 | 1986-06-24 | Toyo Kohan Co., Ltd. | Method of manufacturing of steel sheet for easy open end can with superior openability |
| EP0216399A1 (en) * | 1985-07-29 | 1987-04-01 | Hoogovens Groep B.V. | Hard steel sheet manufactured from aluminium-killed continuous-cast carbon-manganese steel, and a method for the manufacture of such sheet |
| DE3817242C2 (en) * | 1988-05-20 | 1990-05-31 | Hoesch Stahl Ag, 4600 Dortmund, De | |
| JPH0336215A (en) * | 1989-07-03 | 1991-02-15 | Toyo Kohan Co Ltd | Manufacture of high strength and extremely thin steel sheet for can having excellent plane anisotropy |
| JPH04176817A (en) * | 1990-03-09 | 1992-06-24 | Toyo Kohan Co Ltd | Manufacture of steel sheet for di can |
| EP0521808A1 (en) * | 1991-07-04 | 1993-01-07 | Sollac | Method for producing deep drawing steel sheets |
-
1995
- 1995-09-21 FR FR9511113A patent/FR2739105B1/en not_active Expired - Fee Related
-
1996
- 1996-08-29 EP EP96401861A patent/EP0764725A1/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2444788A (en) * | 1945-02-21 | 1948-07-06 | Carnegie Illinois Steel Corp | Steel strip tempering |
| DE1132168B (en) * | 1960-07-18 | 1962-06-28 | Mannesmann Ag | Process for the production of nitrogen-containing unalloyed or low-alloy steels |
| US4081270A (en) * | 1977-04-11 | 1978-03-28 | Union Carbide Corporation | Renitrogenation of basic-oxygen steels during decarburization |
| US4596608A (en) * | 1985-04-15 | 1986-06-24 | Toyo Kohan Co., Ltd. | Method of manufacturing of steel sheet for easy open end can with superior openability |
| EP0216399A1 (en) * | 1985-07-29 | 1987-04-01 | Hoogovens Groep B.V. | Hard steel sheet manufactured from aluminium-killed continuous-cast carbon-manganese steel, and a method for the manufacture of such sheet |
| DE3817242C2 (en) * | 1988-05-20 | 1990-05-31 | Hoesch Stahl Ag, 4600 Dortmund, De | |
| JPH0336215A (en) * | 1989-07-03 | 1991-02-15 | Toyo Kohan Co Ltd | Manufacture of high strength and extremely thin steel sheet for can having excellent plane anisotropy |
| JPH04176817A (en) * | 1990-03-09 | 1992-06-24 | Toyo Kohan Co Ltd | Manufacture of steel sheet for di can |
| EP0521808A1 (en) * | 1991-07-04 | 1993-01-07 | Sollac | Method for producing deep drawing steel sheets |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 015, no. 167 (C - 0827) 26 April 1991 (1991-04-26) * |
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 485 (C - 0993) 8 October 1992 (1992-10-08) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1065282A1 (en) * | 1999-07-01 | 2001-01-03 | Sollac | Low aluminum steel sheet for cans |
| EP1065286A1 (en) * | 1999-07-01 | 2001-01-03 | Sollac S.A. | Low aluminum steel sheet for cans |
| FR2795744A1 (en) * | 1999-07-01 | 2001-01-05 | Lorraine Laminage | LOW ALUMINUM STEEL SHEET FOR PACKAGING |
| FR2795743A1 (en) * | 1999-07-01 | 2001-01-05 | Lorraine Laminage | LOW ALUMINUM STEEL SHEET FOR PACKAGING |
| US6974511B1 (en) | 1999-07-01 | 2005-12-13 | Sollac | Steel sheet with low aluminum content for containers |
| US7169244B1 (en) | 1999-07-01 | 2007-01-30 | Sollac | Process for manufacturing steel strip with low aluminum content for containers |
| US7524384B2 (en) | 1999-07-01 | 2009-04-28 | Sollac | Metal container comprising a steel sheet with low aluminum content |
| EP3186401B1 (en) | 2014-08-27 | 2019-06-12 | ThyssenKrupp Rasselstein GmbH | Method of manufacturing of a nitrided packaging steel |
| US10920309B2 (en) | 2014-08-27 | 2021-02-16 | Thyssenkrupp Rasselstein Gmbh | Method for producing a nitrided packaging steel |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2739105A1 (en) | 1997-03-28 |
| FR2739105B1 (en) | 1998-04-30 |
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