CH711882A2 - Process for improving an iron-nickel-chromium-manganese alloy for horological applications - Google Patents

Process for improving an iron-nickel-chromium-manganese alloy for horological applications Download PDF

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Publication number
CH711882A2
CH711882A2 CH01758/15A CH17582015A CH711882A2 CH 711882 A2 CH711882 A2 CH 711882A2 CH 01758/15 A CH01758/15 A CH 01758/15A CH 17582015 A CH17582015 A CH 17582015A CH 711882 A2 CH711882 A2 CH 711882A2
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Switzerland
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carbon
nitrogen
alloy
chromium
iron
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CH01758/15A
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French (fr)
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CH711882B1 (en
Inventor
Charbon Christian
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Nivarox Far Sa
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Priority to CH01758/15A priority Critical patent/CH711882B1/en
Publication of CH711882A2 publication Critical patent/CH711882A2/en
Publication of CH711882B1 publication Critical patent/CH711882B1/en

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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/06—Alloys based on chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/066—Manufacture of the spiral spring
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • G04B43/007—Antimagnetic alloys

Abstract

L’invention concerne un procédé d’amélioration d’un alliage fer-nickel-chrome-manganèse et l’utilisation d’un tel alliage pour la fabrication d’un spiral d’horlogerie, on choisit et on élabore un alliage de base comportant, en masse: – de 9,0% à 13,0% de nickel, – de 4,0% à 12,0% de chrome, – de 21,0% à 25,0% de manganèse, – le complément en fer, puis on effectue un durcissement dudit alliage, tout en maintenant ses propriétés antiferromagnétiques, par introduction de carbone et d’azote en interstitiel, avec, en proportion de la masse dudit alliage de base: – de 0,10% à 1,20% de carbone, et/ou – de 0,10% à 1,20% d’azote.The invention relates to a method for improving an iron-nickel-chromium-manganese alloy and the use of such an alloy for the manufacture of a watch spiral, a basic alloy comprising by weight: - from 9.0% to 13.0% of nickel, - from 4.0% to 12.0% of chromium, - from 21.0% to 25.0% of manganese, - the balance of iron, and then hardening said alloy, while maintaining its antiferromagnetic properties, by introducing carbon and nitrogen interstitial, with, in proportion to the mass of said base alloy: - from 0.10% to 1.20 % carbon, and / or - from 0.10% to 1.20% nitrogen.

Description

DescriptionDescription

Domaine de l’invention [0001] L’invention concerne un procédé d’amélioration d’un alliage fer-nickel-chrome-manganèse pour des applications horlogères.FIELD OF THE INVENTION [0001] The invention relates to a process for improving an iron-nickel-chromium-manganese alloy for horological applications.

[0002] L’invention concerne encore l’utilisation d’un tel alliage pour la réalisation d’un spiral.The invention also relates to the use of such an alloy for producing a spiral.

Arrière-plan de l’invention [0003] Les alliages thermo-compensateurs utilisés pour les spiraux d’horlogerie sont en grande majorité issus des travaux de Charles-Edouard Guillaume et basés sur l’Elinvar Fe-Ni-Cr. Des éléments durcissants ont, depuis, été ajoutés: W+C, ou Ti+AI, ou Be, ou Nb, qui ont notamment donné naissance aux alliages «Elinvar», «Ni-Span», «Nivarox», «Isoval».BACKGROUND OF THE INVENTION [0003] The thermo-compensating alloys used for clockwork spirals are for the most part derived from the work of Charles-Edouard Guillaume and based on the Elinvar Fe-Ni-Cr. Hardening elements have since been added: W + C, or Ti + Al, or Be, or Nb, which have in particular given rise to the alloys "Elinvar", "Ni-Span", "Nivarox", "Isoval".

[0004] Tous ces alliages, qui conviennent à l’application en raison de leurs propriétés mécaniques, sont toutefois ferromagnétiques, et donc sensibles aux champs magnétiques, ce qui est préjudiciable à la marche d’une montre.All these alloys, which are suitable for the application because of their mechanical properties, however, are ferromagnetic, and therefore sensitive to magnetic fields, which is detrimental to the running of a watch.

[0005] Dans les années 1970-1990, des travaux sur des alliages antiferromagnétiques ont été publiés mais n’ont pas donné lieu à des développements industriels. Ces alliages sont quasiment insensibles à l’effet d’un champ magnétique, mais présentent quelques difficultés industrielles et l’arrivée de la crise horlogère des années 80 a stoppé les développements. Résumé de l’invention [0006] On connaît, notamment par les travaux du Dr. Ing. Manfred Müller, une famille d’alliages antiferromagnétiques particulièrement intéressante, de type Fe-Mn-Ni-Cr.In the years 1970-1990, work on antiferromagnetic alloys have been published but have not given rise to industrial developments. These alloys are almost insensitive to the effect of a magnetic field, but present some industrial difficulties and the arrival of the crisis of the 1980's stopped the developments. SUMMARY OF THE INVENTION [0006] The work of Dr. Ing. Manfred Müller, a particularly interesting family of antiferromagnetic alloys, Fe-Mn-Ni-Cr type.

[0007] Il est possible de durcir de tels alliages par adjonction de Be, ou par adjonction de Ti+AI.It is possible to harden such alloys by adding Be, or by adding Ti + AI.

[0008] Le Be n’est pas souhaitable en raison de sa toxicité. Et l’ajout de Ti+AI est délicat, car Ti et Al réagissent avec le Ni présent dans l’alliage, et en modifient localement la composition, rendant par là-même difficile la maîtrise du coefficient thermique de l’alliage; de plus, le durcissement structural par précipitation de Ni3AI et Ti3AI tend à réduire la ductilité de l’alliage.The Be is undesirable because of its toxicity. And the addition of Ti + Al is difficult because Ti and Al react with the Ni present in the alloy, and modify the composition locally, thereby making it difficult to control the thermal coefficient of the alloy; in addition, the precipitation hardening of Ni3Al and Ti3Al tends to reduce the ductility of the alloy.

[0009] L’objet de l’invention est de trouver une alternative permettant un durcissement satisfaisant.The object of the invention is to find an alternative for satisfactory hardening.

[0010] A cet effet, l’invention concerne un procédé d’amélioration d’un alliage fer-nickel-chrome-manganèse pour des applications horlogères, selon la revendication 1.For this purpose, the invention relates to a method for improving an iron-nickel-chromium-manganese alloy for horological applications, according to claim 1.

[0011] En résumé, la présente invention permet de durcir un alliage de type Fe-Mn-Ni-Cr, par l’introduction de carbone et d’azote en interstitiel, selon le principe des aciers HIS.In summary, the present invention allows to harden a Fe-Mn-Ni-Cr type alloy, by the introduction of carbon and nitrogen interstitial, according to the principle of HIS steels.

[0012] Un tel durcissement par C+N permet le développement d’alliages comportant de bonnes propriétés mécaniques, qui sont antiferromagnétiques, et écologiques.Such hardening by C + N allows the development of alloys with good mechanical properties, which are antiferromagnetic, and ecological.

[0013] L’invention concerne encore l’utilisation d’un tel alliage pour la réalisation d’un spiral d’horlogerie.The invention also relates to the use of such an alloy for the production of a horological spiral.

Description détaillée des modes de réalisation préférés [0014] L’invention concerne un procédé d’amélioration d’un alliage fer-nickel-chrome-manganèse pour des applications horlogères.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0014] The invention relates to a method of improving an iron-nickel-chromium-manganese alloy for horological applications.

[0015] Selon l’invention, on choisit et on élabore un alliage de base comportant, en masse: - de 4,0% à 13,0% de nickel, - de 4,0% à 12,0% de chrome, - de 21,0% à 25,0% de manganèse, - le complément en fer, et on effectue un durcissement de cet alliage, tout en maintenant ses propriétés antiferromagnétiques, par introduction de carbone et d’azote en interstitiel, avec, en proportion de la masse de l’alliage de base: - de 0,10% à 1,20% de carbone, et/ou - de 0,10% à 1,20% d’azote.According to the invention, a basic alloy is selected and produced comprising, by weight: from 4.0% to 13.0% of nickel, from 4.0% to 12.0% of chromium, from 21.0% to 25.0% of manganese, the iron complement, and this alloy is cured, while maintaining its antiferromagnetic properties, by introducing carbon and nitrogen into interstitial, with, in proportion of the mass of the base alloy: from 0.10% to 1.20% of carbon, and / or from 0.10% to 1.20% of nitrogen.

[0016] Plus particulièrement, on ajuste cette introduction de carbone et d’azote, telle que la somme des proportions, en masse de l’alliage de base, du carbone et de l’azote, est comprise entre 0,60% et 0,95%.More particularly, it adjusts the introduction of carbon and nitrogen, such that the sum of the proportions, by weight of the base alloy, carbon and nitrogen, is between 0.60% and 0. 95%.

[0017] Plus particulièrement, on ajuste cette introduction de carbone et d’azote, telle que la somme des proportions, en masse de l’alliage de base, du carbone et de l’azote, est comprise entre 0,75% et 0,95%.More particularly, this introduction of carbon and nitrogen is adjusted, such that the sum of the proportions by weight of the base alloy, carbon and nitrogen is between 0.75% and 0. 95%.

[0018] Plus particulièrement, on ajuste cette introduction de carbone et d’azote, telle que la somme des proportions, en masse de l’alliage de base, du carbone et de l’azote, est comprise entre 0,80% et 0,85%.More particularly, this introduction of carbon and nitrogen is adjusted, such that the sum of the proportions by weight of the base alloy, carbon and nitrogen is between 0.80% and 0. 85%.

[0019] Plus particulièrement, on ajuste cette introduction de carbone et d’azote, telle que le rapport des pourcentages de carbone et d’azote en masse totale de l’alliage de base est compris entre 0,5 et 2,0.More particularly, it adjusts the introduction of carbon and nitrogen, such that the ratio of percentages of carbon and nitrogen in total mass of the base alloy is between 0.5 and 2.0.

Claims (13)

[0020] Plus particulièrement, on ajuste cette introduction de carbone et d’azote, telle que le rapport des pourcentages de carbone et d’azote en masse totale de l’alliage de base est compris entre 1,0 et 1,5. [0021] Plus particulièrement, on choisit cet alliage de base comportant, en masse, au moins 8,0% de chrome. [0022] Plus particulièrement, on incorpore à l’alliage de base, en proportion de la masse de l’alliage de base, entre 0,5% et 5,0% de molybdène et/ou de cuivre afin d’améliorer sa tenue à la corrosion. [0023] Plus particulièrement, on ajoute du ferrochrome à l’azote pour arriver à la bonne composition chimique. [0024] Plus particulièrement, on ajoute du ferromanganèse au carbone pour arriver à la bonne composition chimique. [0025] Plus particulièrement, on ajoute du ferrochrome à l’azote, et du ferromanganèse au carbone pour arriver à la bonne composition chimique. [0026] Plus particulièrement, l’élaboration de cet alliage inclut un procédé de coulée, comportant les étapes suivantes: - préparer dans les proportions adéquates, d’une part les métaux purs, nickel, chrome, fer, et d’autre part des pré-alliages du type: ferrochrome à bas carbone dit Nitrided Low Carbon Ferro Chromium, avec 65% de chrome, 3% d’azote, le reste en fer, ferromanganèse à haut carbone dit High Carbon Ferro Manganèse, avec 75% de manganèse, 7% de carbone, le reste en fer, ferromanganèse à bas carbone dit Low Carbon Ferro Manganèse, avec 95% de manganèse, le reste en fer, - dans un four à induction sous vide, fondre sous pression partielle d’azote le fer, le nickel et le chrome, - ajouter le ferromanganèse à bas carbone et le ferromanganèse à haut carbone, - contrôler la température et la maintenir environ 20 °C au-dessus du liquidus de l’alliage, ou à au moins 20 °C au-dessus du liquidus de l’alliage, - ajouter le ferrochrome à l’azote à bas carbone, qui est la source d’azote principale, - contrôler la température et la maintenir environ 20 °C au-dessus du liquidus de l’alliage, ou à au moins 20 °C au-dessus du liquidus de l’alliage, - procéder à la coulée du lingot. [0027] L’invention concerne encore l’utilisation d’un tel alliage pour la réalisation d’un spiral d’horlogerie, notamment un ressort spiral pour oscillateur. RevendicationsMore particularly, this introduction of carbon and nitrogen is adjusted, such that the ratio of percentages of carbon and nitrogen in total mass of the base alloy is between 1.0 and 1.5. More particularly, one chooses this base alloy comprising, by mass, at least 8.0% of chromium. More particularly, is incorporated in the base alloy, in proportion to the mass of the base alloy, between 0.5% and 5.0% molybdenum and / or copper to improve its performance. to corrosion. More particularly, ferrochrome nitrogen is added to arrive at the right chemical composition. More particularly, carbon ferromanganese is added to arrive at the right chemical composition. More particularly, ferrochrome is added to nitrogen, and ferromanganese carbon to arrive at the right chemical composition. More particularly, the preparation of this alloy includes a casting process, comprising the following steps: - preparing in the appropriate proportions, on the one hand pure metals, nickel, chromium, iron, and on the other hand pre-alloys of the type: low-carbon ferrochrome called Nitrided Low Carbon Ferro Chromium, with 65% of chromium, 3% of nitrogen, the remainder of iron, ferromanganese with high carbon called High Carbon Ferro Manganese, with 75% of manganese, 7% of carbon, the rest of iron, low carbon ferromanganese said Low Carbon Ferro Manganese, with 95% of manganese, the rest of iron, - in a vacuum induction furnace, melt under partial pressure of nitrogen iron, nickel and chromium, - add low-carbon ferromanganese and high-carbon ferromanganese, - control the temperature and maintain it at approximately 20 ° C above the liquidus of the alloy, or at least 20 ° C above above the liquidus of the alloy, - add the ferrochrome to the low carbon nitrogen, which is the main nitrogen source, - control the temperature and maintain it at about 20 ° C above the liquidus of the alloy, or at least 20 ° C above the liquidus of the alloy, - proceed to the casting of the ingot. The invention also relates to the use of such an alloy for the production of a watch hairspring, including a spiral spring for oscillator. claims 1. Procédé d’amélioration d’un alliage fer-nickel-chrome-manganèse pour des applications horlogères, caractérisé en ce qu’on choisit et on élabore un alliage de base comportant, en masse: - 4,0% à 13,0% de nickel, - de 4,0% à 12,0% de chrome, - de 21,0% à 25,0% de manganèse, - le complément en fer, et en ce qu’on effectue un durcissement dudit alliage, tout en maintenant ses propriétés antiferromagnétiques, par introduction de carbone et d’azote en interstitiel, avec, en proportion de la masse dudit alliage de base: - de 0,10% à 1,20% de carbone, et/ou - de 0,10% à 1,20% d’azote.1. A method for improving an iron-nickel-chromium-manganese alloy for horological applications, characterized in that a base alloy is selected and prepared comprising, by weight: - 4.0% to 13.0 % nickel, - from 4.0% to 12.0% chromium, - from 21.0% to 25.0% manganese, - the iron complement, and in that one carries out a hardening of said alloy, while maintaining its antiferromagnetic properties, by introducing carbon and nitrogen interstitial, with, in proportion to the mass of said base alloy: - from 0.10% to 1.20% carbon, and / or - from 0 , 10% to 1.20% nitrogen. 2. Procédé selon la revendication 1, caractérisé en ce qu’on ajuste ladite introduction de carbone et d’azote, telle que la somme des proportions, en masse dudit alliage de base, du carbone et de l’azote, est comprise entre 0,60% et 0,95%.2. Process according to claim 1, characterized in that said introduction of carbon and nitrogen is adjusted, such that the sum of the proportions by mass of said base alloy, carbon and nitrogen, is between 0.degree. , 60% and 0.95%. 3. Procédé selon la revendication 2, caractérisé en ce qu’on ajuste ladite introduction de carbone et d’azote, telle que la somme des proportions, en masse dudit alliage de base, du carbone et de l’azote, est comprise entre 0,75% et 0,95%.3. Method according to claim 2, characterized in that adjusting said introduction of carbon and nitrogen, such that the sum of the proportions, by mass of said base alloy, carbon and nitrogen, is between 0 , 75% and 0.95%. 4. Procédé selon la revendication 3, caractérisé en ce qu’on ajuste ladite introduction de carbone et d’azote, telle que la somme des proportions, en masse dudit alliage de base, du carbone et de l’azote, est comprise entre 0,80% et 0,85%.4. Process according to claim 3, characterized in that said introduction of carbon and nitrogen is adjusted, such that the sum of the proportions by mass of said base alloy, carbon and nitrogen, is between 0.degree. , 80% and 0.85%. 5. Procédé selon l’une des revendications 1 à 4, caractérisé en ce qu’on ajuste ladite introduction de carbone et d’azote, telle que le rapport des pourcentages de carbone et d’azote en masse totale dudit alliage de base est compris entre 0,5 et 2,0.5. Method according to one of claims 1 to 4, characterized in that said adjustment of said carbon and nitrogen, such that the ratio of percentages of carbon and nitrogen in total mass of said base alloy is included between 0.5 and 2.0. 6. Procédé selon la revendication 5, caractérisé en ce qu’on ajuste ladite introduction de carbone et d’azote, telle que le rapport des pourcentages de carbone et d’azote en masse totale dudit alliage de base est compris entre 1,0 et 1,5.6. Process according to claim 5, characterized in that said introduction of carbon and nitrogen, such that the ratio of the percentages of carbon and nitrogen in total mass of said base alloy is between 1.0 and 1.5. 7. Procédé selon l’une des revendications 1 à 6, caractérisé en ce qu’on choisit ledit alliage de base comportant, en masse, au moins 8,0% de chrome.7. Method according to one of claims 1 to 6, characterized in that said base alloy comprising, by mass, at least 8.0% of chromium. 8. Procédé selon l’une des revendications 1 à 7, caractérisé en ce qu’on incorpore audit alliage de base, en proportion de la masse dudit alliage de base, entre 0,5% et 5,0% de molybdène et/ou de cuivre afin d’améliorer sa tenue à la corrosion.8. Method according to one of claims 1 to 7, characterized in that incorporates said base alloy, in proportion to the mass of said base alloy, between 0.5% and 5.0% molybdenum and / or of copper to improve its resistance to corrosion. 9. Procédé selon l’une des revendications 1 à 8, caractérisé en ce qu’on ajoute du ferrochrome à l’azote pour arriver à la bonne composition chimique.9. Method according to one of claims 1 to 8, characterized in that ferrochrome is added to the nitrogen to arrive at the right chemical composition. 10. Procédé selon l’une des revendications 1 à 8, caractérisé en ce qu’on ajoute du ferromanganèse au carbone pour arriver à la bonne composition chimique.10. Method according to one of claims 1 to 8, characterized in that carbon ferromanganese is added to arrive at the right chemical composition. 11. Procédé selon l’une des revendications 1 à 8, caractérisé en ce qu’on ajoute du ferrochrome à l’azote, et du ferromanganèse au carbone, pour arriver à la bonne composition chimique.11. Method according to one of claims 1 to 8, characterized in that ferrochrome is added to nitrogen, and ferromanganese carbon, to arrive at the right chemical composition. 12. Procédé selon la revendication 11, caractérisé en ce que l’élaboration dudit alliage inclut un procédé de coulée, comportant les étapes suivantes: - préparer dans les proportions adéquates, d’une part les métaux purs, nickel, chrome, fer, et d’autre part des préalliages du type: ferrochrome à bas carbone dit Nitrided Low Carbon Ferro Chromium, avec 65% de chrome, 3% d’azote, le reste en fer, ferromanganèse à haut carbone dit High Carbon Ferro Manganèse, avec 75% de manganèse, 7% de carbone, le reste en fer, ferromanganèse à bas carbone dit Low Carbon Ferro Manganèse, avec 95% de manganèse, le reste en fer, - dans un four à induction sous vide, fondre sous pression partielle d’azote le fer, le nickel et le chrome, - ajouter le ferromanganèse à bas carbone et le ferromanganèse à haut carbone, - contrôler la température et la maintenir à au moins 20 °C au-dessus du liquidus de l’alliage, - ajouter le ferrochrome à l’azote à bas carbone, - contrôler la température et la maintenir à au moins 20 °C au-dessus du liquidus de l’alliage, - procéder à la coulée du lingot.12. The method of claim 11, characterized in that the development of said alloy includes a casting process, comprising the following steps: - prepare in the appropriate proportions, on the one hand pure metals, nickel, chromium, iron, and on the other hand, pre-alloys of the type: low carbon ferrochrome called Nitrided Low Carbon Ferro Chromium, with 65% of chromium, 3% of nitrogen, the rest of iron, ferromanganese high carbon said High Carbon Ferro Manganese, with 75% of manganese, 7% of carbon, the rest of iron, low carbon ferro-manganese known as Low Carbon Ferro Manganese, with 95% of manganese, the rest of iron, - in a vacuum induction furnace, melt under partial pressure of nitrogen iron, nickel and chromium, - add low-carbon ferromanganese and high-carbon ferromanganese, - control the temperature and keep it at least 20 ° C above the liquidus of the alloy, - add the ferrochrome with low carbon nitrogen, - check the temperature and keep it at least 20 ° C above the liquidus of the alloy, - proceed to the casting of the ingot. 13. Utilisation d’un alliage réalisé selon l’une des revendications 1 à 12 pour la réalisation d’un spiral d’horlogerie.13. Use of an alloy made according to one of claims 1 to 12 for producing a clockwork hairspring.
CH01758/15A 2015-12-02 2015-12-02 A process for hardening an iron-nickel-chromium-manganese alloy for horological applications. CH711882B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113126466A (en) * 2019-12-31 2021-07-16 尼瓦罗克斯-法尔股份公司 Balance spring for a timepiece movement and method for manufacturing same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113126466A (en) * 2019-12-31 2021-07-16 尼瓦罗克斯-法尔股份公司 Balance spring for a timepiece movement and method for manufacturing same

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