EP0745697B1 - Iron-cobalt-nickel alloy and its use for the manufacture of a shadow mask - Google Patents

Iron-cobalt-nickel alloy and its use for the manufacture of a shadow mask Download PDF

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Publication number
EP0745697B1
EP0745697B1 EP96400734A EP96400734A EP0745697B1 EP 0745697 B1 EP0745697 B1 EP 0745697B1 EP 96400734 A EP96400734 A EP 96400734A EP 96400734 A EP96400734 A EP 96400734A EP 0745697 B1 EP0745697 B1 EP 0745697B1
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alloy
shadow mask
equal
manufacture
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German (de)
French (fr)
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EP0745697A1 (en
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Ricardo Cozar
Marie-Paul Solignac
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Aperam Stainless Precision SAS
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Imphy Ugine Precision SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt

Definitions

  • the present invention relates to a low Fe-Ni-Co alloy coefficient of expansion as well as its use for the manufacture of a shadow mask for cathode ray display tube.
  • Low-expansion Fe-Ni-Co alloys commonly known as SUPERINVAR
  • SUPERINVAR Low-expansion Fe-Ni-Co alloys
  • These alloys are used in particular for the manufacture of shadow masks as indicated, for example, in European patent application EP 05340460 which proposes to use for the manufacture of shadow masks an Fe-Ni-Co alloy containing, by weight, in addition to iron, from 28% to 34% of nickel, from 2% to 7% of cobalt, from 0.1% to 1% of manganese, less than 0.1% of silicon and less than 0.01 % of carbon; the remainder being impurities resulting from the processing.
  • this alloy sometimes has the drawback of having a point M s at the start of martensitic transformation close to ambient temperature so that, either during the formation of the shadow mask, or during its storage at low temperature, the transformation martensitic begins, which causes permanent deformation of the shadow mask.
  • the alloy due in particular to the manganese content, considered necessary for the alloy to have good hot rolling ability, the alloy has a coefficient of expansion which is a little too high to sufficiently reduce the blistering defect. of the shadow mask.
  • the aim of the present invention is to provide an Fe-Ni-Co alloy which has a martensitic transformation start point of less than -50 ° C, an average coefficient of thermal expansion between 20 ° C and 100 ° C of less than 0, 7x10 -6 / ° K and an average coefficient of thermal expansion between 80 ° C and 130 ° C less than 1x10 -6 / ° K.
  • the subject of the invention is an Fe-Ni-Co alloy, the chemical composition of which comprises, by weight: 32% ⁇ Ni ⁇ 34% 3.5% ⁇ Co ⁇ 6.5% 0% ⁇ Mn ⁇ 0.1% 0% ⁇ If ⁇ 0.1% 0% ⁇ Cr ⁇ 0.1% 0.005% ⁇ C ⁇ 0.02% S ⁇ 0.001% 0.0001% ⁇ Ca ⁇ 0.002% 0.0001% ⁇ Mg ⁇ 0.002% the remainder being iron and impurities resulting from the production, including copper, molybdenum, vanadium, nobium; the chemical composition of the alloy further satisfying the relationships: Co + Ni ⁇ 38.5% Co + 0.5 x Ni ⁇ 20% Co + 5 x Ni ⁇ 165.5% and S ⁇ 0.02 x Mn + 0.8 x Ca + 0.6 x Mg
  • the contents of copper, molybdenum, vanadium and niobium must each be less than 0.1%. And better yet, the sum of the contents of manganese, silicon, chromium, copper, molybdenum, vanadium and niobium must be less than 0.30%.
  • the oxygen content is lower or equal to 0.01%, whether the nitrogen content is less than or equal to 0.005% and the phosphorus content is less than or equal to 0.005%.
  • the invention also relates to the use of the alloy according to the invention for the manufacture of a shadow mask as well as the mask shade thus obtained.
  • the alloy according to the invention is a Fe-Ni-Co alloy whose chemical composition is adjusted so that, at the same time, its average coefficient of expansion between 20 ° C and 100 ° C is less than or equal to 0.7x10 - 6 / ° K, its average expansion coefficient between 80 ° C and 130 ° C is less than or equal to 1x10 -6 / ° K and are point M s is less than -50 ° C.
  • the chemical composition of the alloy comprises, by weight, at least 32% and at most 34% of nickel as well as at least 3.5% and at most 6.5% of cobalt, the nickel and cobalt contents being such that : Co + Ni ⁇ 38.5% so that the average coefficient of expansion between 20 ° C and 100 ° C is less than 0.7x10 -6 / ° K; Co + 0.5 x Ni ⁇ 20% so that the average coefficient of expansion between 80 ° C and 130 ° C is less than 1x10 -6 / ° K; Co + 5 x Ni ⁇ 165.5% so that the point M s is less than -50 ° C.
  • the manganese, silicon and chromium contents must be less than or equal to 0.1 %.
  • the alloy In order for the point M s to remain below -50 ° C., the alloy must contain at least 0.005% carbon, however, in order not to deteriorate the formability by drawing, the carbon content does not must not exceed 0.02%.
  • the oxygen content remains less than or equal to 0.01%, than the nitrogen content remains less than or equal to 0.005% and that the content of phosphorus remains less than or equal to 0.005%.
  • the alloy is produced, it is poured into an ingot or a slab, it is hot rolled to form a strip of thickness of approximately 4mm; the strip is then cold rolled to obtain a cold strip with a thickness of about 0.15 mm.
  • This cold strip has a plastic flow limit R p0.2 at 20 ° C of the order of 600Mpa which is much too large to allow easy shaping, also, after machining the mask blanks by chemical cutting, these blanks are subjected to an annealing between 700 ° C and 850 ° C which brings the plastic flow limit R p0.2 at 20 ° C to about 320Mpa. Then each blank is shaped, for example by stamping, to obtain a shadow mask.
  • the alloys A to D according to the invention were manufactured, the chemical compositions of which were, in% by weight: rep Or Co Mn Yes Cr VS S It Mg Fe AT 32.7 4.5 0.06 0.08 0.04 0.014 0.0006 0.0005 0.0015 comp. B 33.5 4.5 0.05 0.08 0.07 0.014 0.0009 0.0012 0.0009 comp. VS 33.5 3.5 0.05 0.08 0.05 0.011 0.0007 0.0008 0.0007 comp. D 33.3 4.2 0.05 0.09 0.06 0.018 0.0008 0.0011 0.0011 comp.
  • shadow masks can be made in particular a sheet pierced with holes and shaped by stamping.
  • These shadow masks have a fully structured austenitic even after shaping or after storage in a cold atmosphere, and they have a local blistering defect of at least minus 40% if there is no local blistering of alloy shadow masks Iron-Nickel according to the prior art.

Description

La présente invention concerne un alliage Fe-Ni-Co a faible coefficient de dilatation ainsi que son utilisation pour la fabrication d'un masque d'ombre pour tube cathodique de visualisation.The present invention relates to a low Fe-Ni-Co alloy coefficient of expansion as well as its use for the manufacture of a shadow mask for cathode ray display tube.

Les alliages Fe-Ni-Co à faible coefficient de dilatation, communément appelés SUPERINVAR, sont bien connus. Ces alliages sont utilisés notamment pour la fabrication de masques d'ombre comme l'indique, par exemple, la demande de brevet européen EP 05340460 qui propose d'utiliser pour la fabrication de masques d'ombre un alliage Fe-Ni-Co contenant, en poids, outre le fer, de 28% à 34% de nickel, de 2% à 7% de cobalt, de 0,1% à 1% de manganèse, moins de 0,1% de silicium et moins de 0,01% de carbone; le reste étant des impuretés résultant de l'élaboration. Mais cet alliage présente parfois l'inconvénient d'avoir un point Ms de début de transformation martensitique proche de la température ambiante si bien que, soit lors du formage du masque d'ombre, soit lors de son stockage à basse température, la transformation martensitique débute, ce qui provoque des déformations permanentes du masque d'ombre. De plus, du fait, notamment, de la teneur en manganèse, considérée comme nécessaire pour que l'alliage ait une bonne aptitude au laminage à chaud, l'alliage a un coefficient de dilatation un peu trop élevé pour réduire suffisamment le défaut de cloquage du masque d'ombre.Low-expansion Fe-Ni-Co alloys, commonly known as SUPERINVAR, are well known. These alloys are used in particular for the manufacture of shadow masks as indicated, for example, in European patent application EP 05340460 which proposes to use for the manufacture of shadow masks an Fe-Ni-Co alloy containing, by weight, in addition to iron, from 28% to 34% of nickel, from 2% to 7% of cobalt, from 0.1% to 1% of manganese, less than 0.1% of silicon and less than 0.01 % of carbon; the remainder being impurities resulting from the processing. However, this alloy sometimes has the drawback of having a point M s at the start of martensitic transformation close to ambient temperature so that, either during the formation of the shadow mask, or during its storage at low temperature, the transformation martensitic begins, which causes permanent deformation of the shadow mask. In addition, due in particular to the manganese content, considered necessary for the alloy to have good hot rolling ability, the alloy has a coefficient of expansion which is a little too high to sufficiently reduce the blistering defect. of the shadow mask.

Le but de la présente invention est de proposer un alliage Fe-Ni-Co qui ait un point de début de transformation martensitique inférieur à -50°C, un coefficient de dilatation thermique moyen entre 20°C et 100°C inférieur à 0,7x10-6/°K et un coefficient de dilatation thermique moyen entre 80°C et 130°C inférieur à 1x10-6/°K.The aim of the present invention is to provide an Fe-Ni-Co alloy which has a martensitic transformation start point of less than -50 ° C, an average coefficient of thermal expansion between 20 ° C and 100 ° C of less than 0, 7x10 -6 / ° K and an average coefficient of thermal expansion between 80 ° C and 130 ° C less than 1x10 -6 / ° K.

A cet effet, l'invention a pour objet un alliage Fe-Ni-Co dont la composition chimique comprend, en poids: 32% ≤ Ni ≤ 34% 3,5% ≤ Co ≤ 6,5% 0% ≤ Mn ≤ 0,1% 0% ≤ Si ≤ 0,1% 0% ≤ Cr ≤ 0,1% 0,005% ≤ C ≤ 0,02% S ≤ 0,001% 0,0001% ≤ Ca ≤ 0,002% 0,0001% ≤ Mg ≤ 0,002% le reste étant du fer et des impuretés résultant de l'élaboration parmi lesquelles le cuivre, le molybdène, le vanadium, le nobium; la composition chimique de l'alliage satisfaisant en outre les relations: Co + Ni ≤ 38,5% Co + 0,5 x Ni ≥ 20% Co + 5 x Ni ≥ 165,5% et S ≤ 0,02 x Mn + 0,8 x Ca + 0,6 x Mg To this end, the subject of the invention is an Fe-Ni-Co alloy, the chemical composition of which comprises, by weight: 32% ≤ Ni ≤ 34% 3.5% ≤ Co ≤ 6.5% 0% ≤ Mn ≤ 0.1% 0% ≤ If ≤ 0.1% 0% ≤ Cr ≤ 0.1% 0.005% ≤ C ≤ 0.02% S ≤ 0.001% 0.0001% ≤ Ca ≤ 0.002% 0.0001% ≤ Mg ≤ 0.002% the remainder being iron and impurities resulting from the production, including copper, molybdenum, vanadium, nobium; the chemical composition of the alloy further satisfying the relationships: Co + Ni ≤ 38.5% Co + 0.5 x Ni ≥ 20% Co + 5 x Ni ≥ 165.5% and S ≤ 0.02 x Mn + 0.8 x Ca + 0.6 x Mg

De préférence, les teneurs en cuivre, molybdène, vanadium et niobium doivent chacune être inférieure à 0,1%. Et mieux encore, la somme des teneurs en manganèse, silicium, chrome, cuivre, molybdène, vanadium et niobium doit être inférieure à 0,30%.Preferably, the contents of copper, molybdenum, vanadium and niobium must each be less than 0.1%. And better yet, the sum of the contents of manganese, silicon, chromium, copper, molybdenum, vanadium and niobium must be less than 0.30%.

Enfin, il est préférable que la teneur en oxygène soit inférieure ou égale à 0,01%, que la teneur en azote soit inférieure ou égale à 0,005% et que la teneur en phosphore soit inférieure ou égale à 0,005%.Finally, it is preferable that the oxygen content is lower or equal to 0.01%, whether the nitrogen content is less than or equal to 0.005% and the phosphorus content is less than or equal to 0.005%.

L'invention a également pour objet l'utilisation de l'alliage selon l'invention pour la fabrication d'un masque d'ombre ainsi que le masque d'ombre ainsi obtenu.The invention also relates to the use of the alloy according to the invention for the manufacture of a shadow mask as well as the mask shade thus obtained.

L'invention va maintenant être décrite de façon plus précise mais non limitative.The invention will now be described in more detail, but not limiting.

Alors qu'il est connu que les déformations d'un masque d'ombre sont engendrées principalement par un échauffement moyen jusqu'à une température inférieure à 100°C et typiquement de 80°C, les inventeurs ont estimé, de façon nouvelle, que des défauts d'image étaient engendrés par des échauffements locaux du masque d'ombre à des températures pouvant aller jusqu'à 130°C. Pour réduire au maximum les défauts d'image il faut utiliser, pour la fabrication du masque d'ombre, un alliage qui, non seulement, a un coefficient de dilatation moyen entre 20°C et 100°C le plus faible possible, mais qui, également, a un coefficient de dilatation moyen entre 80°C et 130°C le plus faible possible. De plus, cet alliage doit avoir une structure micrographique stable jusqu'à une température suffisamment basse, c'est à dire jusqu'à au moins -50°C.While it is known that the deformations of a shadow mask are generated mainly by an average heating up to a temperature below 100 ° C and typically 80 ° C, the inventors have estimated, in a new way, that image defects were caused by local heating of the shadow mask at temperatures that can go up to 130 ° C. To minimize image defects you must use, for the manufacture of the shadow mask, an alloy which, not only, has an average coefficient of expansion between 20 ° C and 100 ° C on as low as possible, but which also has a coefficient of expansion average between 80 ° C and 130 ° C as low as possible. In addition, this alloy must have a stable micrographic structure up to a temperature sufficiently low, i.e. down to at least -50 ° C.

L'alliage selon l'invention est un alliage Fe-Ni-Co dont la composition chimique est ajustée pour que, à la fois, son coefficient de dilatation moyen entre 20°C et 100°C soit inférieur ou égal à 0,7x10-6/°K, son coefficient de dilatation moyen entre 80°C et 130°C soit inférieur ou égal à 1x10-6/°K et sont point Ms soit inférieur à -50°C. The alloy according to the invention is a Fe-Ni-Co alloy whose chemical composition is adjusted so that, at the same time, its average coefficient of expansion between 20 ° C and 100 ° C is less than or equal to 0.7x10 - 6 / ° K, its average expansion coefficient between 80 ° C and 130 ° C is less than or equal to 1x10 -6 / ° K and are point M s is less than -50 ° C.

La composition chimique de l'alliage comprend, en poids, au moins 32% et au plus 34% de nickel ainsi que au moins 3,5% et au plus 6,5% de cobalt, les teneurs en nickel et cobalt étant telles que: Co + Ni ≤ 38,5% pour que le coefficient de dilatation moyen entre 20°C et 100°C soit inférieur à 0,7x10-6/°K; Co + 0,5 x Ni ≥ 20% pour que le coefficient de dilatation moyen entre 80°C et 130°C soit inférieur à 1x10-6/°K ; Co + 5 x Ni ≥ 165,5% pour que le point Ms soit inférieur à -50°C.The chemical composition of the alloy comprises, by weight, at least 32% and at most 34% of nickel as well as at least 3.5% and at most 6.5% of cobalt, the nickel and cobalt contents being such that : Co + Ni ≤ 38.5% so that the average coefficient of expansion between 20 ° C and 100 ° C is less than 0.7x10 -6 / ° K; Co + 0.5 x Ni ≥ 20% so that the average coefficient of expansion between 80 ° C and 130 ° C is less than 1x10 -6 / ° K; Co + 5 x Ni ≥ 165.5% so that the point M s is less than -50 ° C.

Mais, pour que le coefficient de dilatation moyen entre 20°C et 100°C soit inférieur à 0,7x10-6/°K, il faut que les teneurs en manganèse, en silicium et en chrome soient inférieures ou égales à 0,1%.However, for the average coefficient of expansion between 20 ° C and 100 ° C to be less than 0.7 x 10 -6 / ° K, the manganese, silicon and chromium contents must be less than or equal to 0.1 %.

Pour que le point Ms reste au dessous de -50°C, l'alliage doit contenir au moins 0,005% de carbone, cependant, afin de ne pas détériorer l'aptitude à la mise en forme par emboutissage, la teneur en carbone ne doit pas dépasser 0,02%.In order for the point M s to remain below -50 ° C., the alloy must contain at least 0.005% carbon, however, in order not to deteriorate the formability by drawing, the carbon content does not must not exceed 0.02%.

Cependant, les alliages industriels contiennent toujours des éléments résiduels tels que le cuivre, le molybdène, le vanadium ou le niobium, et, pour que le coefficient de dilatation soit le plus faible possible, il est souhaitable que les teneurs en chacun de ces éléments restent inférieures ou égales à 0,1% et, de préférence, que : Mn + Si + Cr + Mo + V + Nb + Cu ≤ 0,30% However, industrial alloys always contain residual elements such as copper, molybdenum, vanadium or niobium, and, so that the coefficient of expansion is as low as possible, it is desirable that the contents in each of these elements remain less than or equal to 0.1% and, preferably, that: Mn + Si + Cr + Mo + V + Nb + Cu ≤ 0.30%

Enfin, et afin d'obtenir une meilleure ductilité à chaud, il est préférable que la teneur en oxygène reste inférieure ou égale à 0,01%, que la teneur en azote reste inférieure ou égale à 0,005% et que la teneur en phosphore reste inférieure ou égale à 0,005%.Finally, and in order to obtain better hot ductility, it is preferable that the oxygen content remains less than or equal to 0.01%, than the nitrogen content remains less than or equal to 0.005% and that the content of phosphorus remains less than or equal to 0.005%.

Avec cet alliage, on peut, notamment, fabriquer des masques d'ombre. Pour cela, on élabore l'alliage, on le coule en lingot ou en brame, on le lamine à chaud pour former un bande d'épaisseur d'environ 4mm; la bande est alors laminée à froid pour obtenir une bande à froid d'épaisseur d'environ 0,15mm. Cette bande à froid a une limite d'écoulement plastique Rp0,2 à 20°C de l'ordre de 600Mpa qui est beaucoup trop importante pour permettre une mise en forme facile, aussi, après usinage des ébauches de masque par découpe chimique, on soumet ces ébauches à un recuit entre 700°C et 850°C qui ramène la limite d'écoulement plastique Rp0,2 à 20°C à environ 320Mpa. Puis chaque ébauche est mise en forme, par exemple par emboutissage, pour obtenir un masque d'ombre.With this alloy, it is possible, in particular, to produce shadow masks. For this, the alloy is produced, it is poured into an ingot or a slab, it is hot rolled to form a strip of thickness of approximately 4mm; the strip is then cold rolled to obtain a cold strip with a thickness of about 0.15 mm. This cold strip has a plastic flow limit R p0.2 at 20 ° C of the order of 600Mpa which is much too large to allow easy shaping, also, after machining the mask blanks by chemical cutting, these blanks are subjected to an annealing between 700 ° C and 850 ° C which brings the plastic flow limit R p0.2 at 20 ° C to about 320Mpa. Then each blank is shaped, for example by stamping, to obtain a shadow mask.

A titre d'exemple, on a fabriqué les alliages A à D selon l'invention dont les compositions chimiques étaient, en % en poids: rep Ni Co Mn Si Cr C S Ca Mg Fe A 32,7 4,5 0,06 0,08 0,04 0,014 0,0006 0,0005 0,0015 comp. B 33,5 4,5 0,05 0,08 0,07 0,014 0,0009 0,0012 0,0009 comp. C 33,5 3,5 0,05 0,08 0,05 0,011 0,0007 0,0008 0,0007 comp. D 33,3 4,2 0,05 0,09 0,06 0,018 0,0008 0,0011 0,0011 comp. By way of example, the alloys A to D according to the invention were manufactured, the chemical compositions of which were, in% by weight: rep Or Co Mn Yes Cr VS S It Mg Fe AT 32.7 4.5 0.06 0.08 0.04 0.014 0.0006 0.0005 0.0015 comp. B 33.5 4.5 0.05 0.08 0.07 0.014 0.0009 0.0012 0.0009 comp. VS 33.5 3.5 0.05 0.08 0.05 0.011 0.0007 0.0008 0.0007 comp. D 33.3 4.2 0.05 0.09 0.06 0.018 0.0008 0.0011 0.0011 comp.

Les caractéristiques de ces alliages étaient: Rp0,2 Rp0,2 Rp0,2 α α α Mpa Mpa Mpa rep 20°/100° 20°/80° 80°/130° Ms 20°C 20°C 200°C 10-6/°K 10-6/°K 10-6/°K °C écroui recuit recuit A 0,31 0,23 0,78 -90 615 320 141 B 0,65 0,65 0,80 <-186 615 318 137 C 0,49 0,45 0,90 <-186 607 304 133 D 0,51 0,49 0,77 <-186 629 322 148 The characteristics of these alloys were: R p0.2 R p0.2 R p0.2 α α α Mpa Mpa Mpa rep 20 ° / 100 ° 20 ° / 80 ° 80 ° / 130 ° M s 20 ° C 20 ° C 200 ° C 10 -6 / ° K 10 -6 / ° K 10 -6 / ° K ° C work hardened annealed annealed AT 0.31 0.23 0.78 -90 615 320 141 B 0.65 0.65 0.80 <-186 615 318 137 VS 0.49 0.45 0.90 <-186 607 304 133 D 0.51 0.49 0.77 <-186 629 322 148

Avec ces alliages on peut fabriquer des masques d'ombre constitués notamment d'une feuille percée de trous et mise en forme par emboutissage. Ces masques d'ombre ont une structure entièrement austénitique même après mise en forme ou après stockage dans une ambiance froide, et ils présentent un défaut de cloquage local inférieur d'au moins 40% au défaut de cloquage local de masques d'ombre en alliage Fer-Nickel selon l'art antérieur.With these alloys, shadow masks can be made in particular a sheet pierced with holes and shaped by stamping. These shadow masks have a fully structured austenitic even after shaping or after storage in a cold atmosphere, and they have a local blistering defect of at least minus 40% if there is no local blistering of alloy shadow masks Iron-Nickel according to the prior art.

Claims (6)

  1. Fe-Ni-Co alloy whose chemical composition comprises, by weight: 32% ≤ Ni ≤ 34% 3.5% ≤ Co ≤ 6.5% 0% ≤ Mn ≤ 0.1% 0% ≤ Si ≤ 0.1% 0% ≤ Cr ≤ 0.1% 0.005% ≤ C ≤ 0.02% S ≤ 0.001% 0.0001% ≤ Ca ≤ 0.002% 0.0001% ≤ Mg ≤ 0.002% the rest being iron and impurities resulting from smelting, among which copper, molybdenum, vanadium and niobium; the chemical composition of the alloy furthermore satisfying the relationships: Co + Ni ≤ 38.5% Co + 0.5 × Ni ≥ 20% Co + 5 × Ni ≥ 165.5% and S ≤ 0.02 × Mn + 0.8 × Ca + 0.6 × Mg.
  2. Alloy according to Claim 1, characterized in that the copper, molybdenum, vanadium and niobium contents are each less than 0.1%.
  3. Alloy according to Claim 2, characterized in that the sum of the manganese, silicon, chromium, copper, molybdenum, vanadium and niobium contents is less than 0.3%.
  4. Alloy according to any one of Claims 1 to 3, characterized in that the oxygen content is less than or equal to 0.01%, the nitrogen content is less than or equal to 0.005% and the phosphorus content is less than or equal to 0.005%.
  5. Use of the alloy according to any one of Claims 1 to 4, for the manufacture of a shadow mask.
  6. Shadow mask, characterized in that it includes at least one foil drilled with holes and consisting of an alloy according to any one of Claims 1 to 4.
EP96400734A 1995-05-05 1996-04-05 Iron-cobalt-nickel alloy and its use for the manufacture of a shadow mask Expired - Lifetime EP0745697B1 (en)

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FR9505362 1995-05-05
FR9505362A FR2733767B1 (en) 1995-05-05 1995-05-05 FE-CO-NI ALLOY AND USE FOR THE MANUFACTURE OF A SHADOW MASK

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EP0745697A1 EP0745697A1 (en) 1996-12-04
EP0745697B1 true EP0745697B1 (en) 2000-02-23

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JP (1) JP3756984B2 (en)
KR (1) KR100416116B1 (en)
CN (1) CN1059933C (en)
DE (1) DE69606737T2 (en)
DK (1) DK0745697T3 (en)
FR (1) FR2733767B1 (en)
PL (1) PL314075A1 (en)

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TW442575B (en) * 1998-12-15 2001-06-23 Nippon Mining & Amp Metals Co Fe-Ni based alloy for tension mask, as well as tension mask, for which the same is used, and color brauon-tube
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EP0745697A1 (en) 1996-12-04
DE69606737T2 (en) 2000-08-17
CN1138634A (en) 1996-12-25
JPH08311622A (en) 1996-11-26
FR2733767A1 (en) 1996-11-08
FR2733767B1 (en) 1997-06-06
PL314075A1 (en) 1996-11-12
KR960041391A (en) 1996-12-19
KR100416116B1 (en) 2004-03-30
DK0745697T3 (en) 2000-06-19
CN1059933C (en) 2000-12-27
DE69606737D1 (en) 2000-03-30
JP3756984B2 (en) 2006-03-22

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