EP0049488B1 - Procédé et dispositif pour le recuit décarburant ou neutre de pièces métalliques - Google Patents

Procédé et dispositif pour le recuit décarburant ou neutre de pièces métalliques Download PDF

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Publication number
EP0049488B1
EP0049488B1 EP81107820A EP81107820A EP0049488B1 EP 0049488 B1 EP0049488 B1 EP 0049488B1 EP 81107820 A EP81107820 A EP 81107820A EP 81107820 A EP81107820 A EP 81107820A EP 0049488 B1 EP0049488 B1 EP 0049488B1
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EP
European Patent Office
Prior art keywords
gas
furnace
oxygen
organic liquid
inert gas
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.)
Expired
Application number
EP81107820A
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German (de)
English (en)
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EP0049488A1 (fr
Inventor
Reinhard Strigl
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.)
Linde GmbH
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Linde GmbH
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Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0049488A1 publication Critical patent/EP0049488A1/fr
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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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere

Definitions

  • the invention relates to a method and a device for the decarburizing or carbon-neutral annealing of metal parts, the metal parts being exposed to high temperatures in an oven and an inert gas and an organic liquid which essentially decomposes into carbon monoxide and hydrogen at high temperatures, be initiated.
  • the annealing takes place at temperatures of approx. 650 to 1 050 ° C., the furnace atmosphere formed by the introduced gas withdrawing carbon from the annealing material or preventing decarburization or carburizing.
  • gas mixtures are conventionally used which are obtained by partially combusting a fuel gas (natural gas, propane) in a gas generator (see Gas Heat International, Volume 27, 1978, No. 9, pages 463 to 468).
  • the proportion of carbon monoxide, hydrogen, carbon dioxide, methane and nitrogen in the gas mixture depends, among other things, on the starting fuel and the gas mixture production process.
  • the proportions of the individual gases in the gas mixture can only be set within narrow limits due to the little variable combustion ratio.
  • the composition of the gas mixture to be introduced into the furnace cannot therefore be satisfactorily adapted to the different furnace conditions which are required for the individual annealing processes with the aid of the known processes.
  • the amount of gas produced in the gas generator per unit of time can only be regulated between 60% and 100% of the maximum generator output. This leads to high fuel or gas consumption, since excess gas has to be flared off.
  • FR-A-2 450 878 describes a device for generating a gas atmosphere.
  • the gas atmosphere is formed exclusively from an inert gas and an alcohol. Both the alcohol and the inert gas are fed into the furnace under pressure.
  • the invention is therefore based on the object of specifying a method with which a gas mixture which can be adapted in its composition to different annealing methods can be provided economically.
  • This object is achieved in that the organic liquid is sucked in and sprayed by an oxygen-containing gas via an injector, the jet formed is surrounded by an inert gas which flows essentially parallel to it and envelops it in the form of a jacket and is introduced into the furnace.
  • an organic liquid is introduced into the furnace in the form of fine droplets. Under the high temperatures prevailing in the furnace, it splits into carbon monoxide and hydrogen. Some or all of these gases react with the oxygen in the oxygen-containing gas, which is used to spray the organic liquid, into carbon dioxide and water. A gas atmosphere consisting of carbon monoxide, hydrogen, carbon dioxide, water and the inert jacket gas is thus established in the furnace chamber.
  • the proportions of the individual components in the gas atmosphere in the furnace space can be adjusted within wide limits, so that the gas atmosphere meets the desired furnace conditions - In particular with regard to the dew point and the carbon dioxide content - can be optimally adjusted.
  • a major advantage of the method according to the invention is that it does not require gas generators. In addition to investment costs for the gas generator, there are also no costs for a washing device or for a cleaning column, and the gas losses that previously occurred when the gas mixture produced in the gas generator was washed.
  • the furnace atmosphere only forms after or when the gas mixture is introduced into the furnace. Since the gas reacts with the annealing material in statu nascendi, the reactivity of the furnace atmosphere is therefore considerably higher than, for example, that of a gas mixture generated in the gas generator and subsequently cleaned. For this reason, gas can be saved in the process according to the invention. This also means that the glow time is reduced.
  • Organic liquids that split into carbon monoxide and hydrogen when introduced into the heated furnace are, for example, alcohols. These are therefore particularly suitable in the process according to the invention. Because of the availability and the low production costs, methanol is preferably used in the process according to the invention.
  • Pure oxygen or an oxygen-nitrogen mixture is advantageously used as the oxygen-containing gas.
  • Compressed air has also proven to be completely suitable for the purpose according to the invention proven sufficiently. When these gases or gas mixtures are used, there is also no need to moisten the gas mixture to be introduced into the furnace.
  • the amount of inert gas that envelops the jet formed in the injector is freely controllable, a certain furnace pressure can be maintained and a desired dew point can be set in an advantageous embodiment of the inventive concept via the amount of inert gas serving as the jacket gas.
  • an addition device consisting of coaxial tubes opens into the furnace, a line for an organic liquid opening into the inner tube and a line for an inert gas opening into the outer tube.
  • the line for an organic liquid advantageously opens into the inner tube via a mixing device, via which a line for an oxygen-containing gas also opens into the inner tube.
  • a gas mixture which is variable in its composition and adaptable to the desired conditions within the furnace in terms of decarburization and redox effect can be provided with the process according to the invention, which is moreover more economical to use and cheaper than, for example, forming gas or ammonia. Fission gas.
  • a pipe 10 opens into a furnace 1, of which only part of the furnace wall is shown in the drawing. Via an T-piece 5, a flange 6, and a stuffing box head 7 with a seal 8 and a union nut 9, an injector 2 is on a pipe 10 connected.
  • the injector 2 projects coaxially and at a distance from the tube wall approximately up to the height of the inner wall of the furnace 1 into tube 10.
  • the injector 2 has two inputs 3 and 4. Via input 3, the injector is fed in a controllable manner with the oxygen-containing gas via a line (not shown).
  • the oxygen-containing gas should be compressed air.
  • the air enters a mixing nozzle at high speed and sucks in methanol via inlet 4 and a line (also not shown).
  • the mist-like mixture of air and fine methanol droplets flows within the injector 2 at high speed to the furnace chamber 1 and enters it in a jet.
  • the jet Before entering the furnace, the jet is surrounded by an inert gas, in the exemplary embodiment nitrogen, in the form of a jacket. The nitrogen is introduced into tube 10 via tube 11 and T-piece 5.
  • the device according to the invention is connected directly to the heat treatment furnace.
  • the nitrogen jacket gas flow which flows around the injector nozzle 12 can be regulated in throughput.
  • the reaction gas composition can thus be adapted to the desired furnace conditions in terms of its carbon monoxide, carbon dioxide, hydrogen, water and nitrogen content.
  • a two-component nozzle concentrically in an inlet pipe through which the nitrogen is passed.
  • the two-component nozzle is charged with methanol and with compressed air, nitrogen-oxygen mixtures, etc. as atomizing gas.
  • the glow time is 35 min.
  • the method according to the invention is particularly suitable for the decarburizing annealing of electrical sheets. However, it can also be used with advantage for bright annealing of steel sheets, copper, semi-finished bronze products and for the oxidizing annealing of stainless steels.

Claims (6)

1. Procédé pour un recuit de décarburation ou de neutralisation de carburation de pièces métalliques, les pièces métalliques étant soumises dans un four à des températures élevées et un gaz inerte ainsi qu'un liquide organique, qui se décomposent essentiellement en oxyde de carbone et en hydrogène à des températures élevées, étant introduits dans le four, caractérisé en ce que le liquide organique est aspiré par un gaz contenant de l'oxygène par l'intermédiaire d'un injecteur et est pulvérisé, et en ce que le jet ainsi formé est entouré par un gaz inerte s'écoulant de façon sensiblement parallèle à celui-ci et l'enfermant en forme d'enveloppe et est introduit dans le four.
2. Procédé selon la revendication 1, caractérisé en ce que le liquide organique est un alcool, de préférence du méthanol.
3. Procédé selon une des revendications 1 ou 2, caractérisé en ce que le gaz contenant de l'oxygène est de l'air, un mélange d'oxygène et d'azote ou de l'oxygène pur.
4. Procédé selon une des revendications 1 à 3, caractérisé en ce que le gaz inerte est de l'azote.
5. Procédé selon une des revendications 1 à 4, caractérisé en ce que la pression et le point de rosée de l'atmosphère gazeuse s'établissant dans le four sont réglés par régulation de la quantité de gaz inerte.
6. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comportant un dispositif d'addition se composant de tubes coaxiaux et débouchant dans le four, un conduit pour un liquide organique débouchant dans le tube intérieur tandis qu'un conduit pour un gaz inerte débouche dans le tube extérieur, caractérisé en ce que le conduit pour un liquide organique débouche par l'intermédiaire d'un dispositif mélangeur dans le tube intérieur et en ce qu'en outre un conduit pour l'admission d'un gaz contenant de l'oxygène débouche par l'intermédiaire du dispositif mélangeur dans le tube intérieur.
EP81107820A 1980-10-04 1981-10-01 Procédé et dispositif pour le recuit décarburant ou neutre de pièces métalliques Expired EP0049488B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3037643 1980-10-04
DE19803037643 DE3037643A1 (de) 1980-10-04 1980-10-04 Verfahren und vorrichtung zum entkohlenden oder kohlungsneutralen gluehen von metallteilen

Publications (2)

Publication Number Publication Date
EP0049488A1 EP0049488A1 (fr) 1982-04-14
EP0049488B1 true EP0049488B1 (fr) 1985-02-20

Family

ID=6113673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107820A Expired EP0049488B1 (fr) 1980-10-04 1981-10-01 Procédé et dispositif pour le recuit décarburant ou neutre de pièces métalliques

Country Status (6)

Country Link
EP (1) EP0049488B1 (fr)
AT (1) AT375679B (fr)
AU (1) AU547114B2 (fr)
BR (1) BR8106371A (fr)
DE (2) DE3037643A1 (fr)
ZA (1) ZA816859B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3506131C1 (de) * 1985-02-22 1986-05-22 Aichelin GmbH, 7015 Korntal-Münchingen Verfahren zum Waermebehandeln von insbesondere metallischen Werkstuecken und Vorrichtung zur Durchfuehrung des Verfahrens
DE3808146A1 (de) * 1988-03-11 1989-09-21 Messer Griesheim Gmbh Verfahren zur herstellung eines schutzgases fuer die waermebehandlung von eisen und nichteisenmetallen
DE3830559C1 (fr) * 1988-09-08 1989-03-09 Linde Ag, 6200 Wiesbaden, De
DE102004047985A1 (de) * 2004-10-01 2006-04-06 Linde Ag Verfahren zur Atmosphärengestaltung bei Wärmebehandlungen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049407B (de) * 1959-01-29 Aachen Dr.-Ing. Wolfgang Gruhl Verfahren zur Entkohlung von Eisen in festem Zustand
DE1106787B (de) * 1956-04-26 1961-05-18 Renault Vorrichtung zum Speisen einer Gruppe von Waermebehandlungsoefen fuer Metalle mit Schutzgas aus Daempfen organischer Fluessigkeiten, die mit Stickstoff angereichert sind
FR1157164A (fr) * 1956-08-04 1958-05-27 Renault Procédé de préparation d'un mélange d'azote et de vapeur de produits organiques pour réaliser une atmosphère de traitement thermique
DE1235352B (de) * 1959-08-26 1967-03-02 Renault Sicherheitseinrichtung an einem Zerstaeuber-Erhitzer fuer die Herstellung von Schutzgas zur Waermebehandlung von Metallen
GB2037816B (en) * 1978-11-30 1982-10-27 Boc Ltd Heat treatment method
FR2450878A1 (fr) * 1979-03-05 1980-10-03 Air Liquide Installation generatrice d'une atmosphere de traitement thermique des metaux

Also Published As

Publication number Publication date
EP0049488A1 (fr) 1982-04-14
ATA129881A (de) 1984-01-15
AU7598381A (en) 1982-05-06
AT375679B (de) 1984-08-27
AU547114B2 (en) 1985-10-10
DE3169071D1 (en) 1985-03-28
ZA816859B (en) 1982-09-29
DE3037643A1 (de) 1982-05-13
BR8106371A (pt) 1982-07-13

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