EP0049488A1 - 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
EP0049488A1
EP0049488A1 EP81107820A EP81107820A EP0049488A1 EP 0049488 A1 EP0049488 A1 EP 0049488A1 EP 81107820 A EP81107820 A EP 81107820A EP 81107820 A EP81107820 A EP 81107820A EP 0049488 A1 EP0049488 A1 EP 0049488A1
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EP
European Patent Office
Prior art keywords
furnace
gas
oxygen
nitrogen
injector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81107820A
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German (de)
English (en)
Other versions
EP0049488B1 (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
Original Assignee
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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Publication of EP0049488B1 publication Critical patent/EP0049488B1/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 decarburizing or carbon-neutral annealing of metal parts, the metal parts being exposed to high temperatures in a furnace and a gas being introduced into the furnace.
  • the annealing takes place at temperatures of approx. 650-1050 ° 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, though International, Volume 27, 1978, No. 9, pages 463 to 468).
  • the proportion of carbon monoxide , Hydrogen, carbon dioxide, methane and nitrogen on the gas mixture depends, among other things, on the starting fuel and the gas mixture production process. For a certain manufacturing 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.
  • composition of the gas mixture to be introduced into the furnace can therefore not be satisfactorily adapted to the different furnace conditions which are required for the individual annealing processes with the aid of the known processes.
  • amount of gas produced in the gas generator per unit of time can only be regulated between approximately 60% and 100% of the maximum generator output. This leads to high fuel or gas consumption, since excess gas has to be flared off.
  • 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 an organic liquid, which decomposes at high temperatures essentially in carbon monoxide and hydrogen, is sucked in and sprayed by an oxygen-containing gas via an injector, the jet formed by a stream flowing essentially parallel to the latter and spraying it enveloping inert gas enveloping and introduced into the furnace.
  • an organic liquid is in the form fine droplets introduced into the oven. 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 chamber can be adjusted within wide limits, so that the gas atmosphere has the desired value Furnace conditions - especially with regard to the dew point and the carbon dioxide content - can be optimally adapted.
  • 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 oxygen-nitrogen mixtures are advantageously used as the oxygen-containing gas.
  • Compressed air has also proven to be completely sufficient for the purpose according to the invention. 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 the inert gas that envelops the jet formed in the injector is freely controllable, a certain furnace pressure can be maintained and the desired dew point can be set in an advantageous embodiment of the inventive idea via the amount of inert gas serving as the jacket gas.
  • a supply line for fluids to be introduced into the furnace opens into a furnace.
  • the supply line is advantageously designed as a tube, within which an injector is arranged coaxially to the tube axis and at a distance from the tube wall.
  • 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 out via a T-piece 5, a flange 6, and a stuffing box head 7 with a seal 8 and a union nut 9 is an injector 2 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 methanol flow to the injector nozzle and serving for the atomization air flow is also the nitrogen Mantelgas- stream which flows around the I njektordüse 12, adjustable in throughput.
  • the carbon monoxide, carbon dioxide, hydrogen, water and nitrogen content of the reaction gas composition can thus be adapted to the desired furnace conditions.
  • a two-component nozzle concentrically in an inlet pipe through which the nitrogen is passed.
  • the two-fluid nozzle is charged with methanol and with compressed air, nitrogen-oxygen mixtures, etc. as atomizing gas.
  • the glow time is 35 min.
  • the process according to the invention is particularly suitable for the decarburizing annealing of electrical sheets.

Landscapes

  • 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)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Furnace Details (AREA)
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 true EP0049488A1 (fr) 1982-04-14
EP0049488B1 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192933A2 (fr) * 1985-02-22 1986-09-03 Aichelin GmbH Procédé et dispositif de traitement thermique notamment de pièces métalliques
EP0331929A1 (fr) * 1988-03-11 1989-09-13 Messer Griesheim Gmbh Procédé pour la production d'une atmosphère protectrice pour le traitement thermique de métaux ferreux et non ferreux
EP0364709A1 (fr) * 1988-09-08 1990-04-25 Linde Aktiengesellschaft Procédé pour produire une atmosphère pour le traitement gazeux dans un appareil pour le traitement thermique
WO2006037459A1 (fr) * 2004-10-01 2006-04-13 Linde Aktiengesellschaft Procede de configuration d'atmospheres dans des traitements thermiques

Citations (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
GB818739A (en) * 1956-08-04 1959-08-19 Renault Improvements in or relating to preparation of a mixture of nitrogen and vapour from organic compounds for use as a heat treatment atmosphere
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
DE1235352B (de) * 1959-08-26 1967-03-02 Renault Sicherheitseinrichtung an einem Zerstaeuber-Erhitzer fuer die Herstellung von Schutzgas zur Waermebehandlung von Metallen
GB2037816A (en) * 1978-11-30 1980-07-16 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

Patent Citations (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
GB818739A (en) * 1956-08-04 1959-08-19 Renault Improvements in or relating to preparation of a mixture of nitrogen and vapour from organic compounds for use as a heat treatment atmosphere
DE1235352B (de) * 1959-08-26 1967-03-02 Renault Sicherheitseinrichtung an einem Zerstaeuber-Erhitzer fuer die Herstellung von Schutzgas zur Waermebehandlung von Metallen
GB2037816A (en) * 1978-11-30 1980-07-16 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Gas, Warme International, Band 27, Heft 9, September 1978, seiten 463-468 R. MEYER: "Entwicklungsstand bei der Herstellung von Kernmaterial fur Elektromotoren" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192933A2 (fr) * 1985-02-22 1986-09-03 Aichelin GmbH Procédé et dispositif de traitement thermique notamment de pièces métalliques
EP0192933A3 (fr) * 1985-02-22 1988-08-31 Aichelin GmbH Procédé et dispositif de traitement thermique notamment de pièces métalliques
EP0331929A1 (fr) * 1988-03-11 1989-09-13 Messer Griesheim Gmbh Procédé pour la production d'une atmosphère protectrice pour le traitement thermique de métaux ferreux et non ferreux
EP0364709A1 (fr) * 1988-09-08 1990-04-25 Linde Aktiengesellschaft Procédé pour produire une atmosphère pour le traitement gazeux dans un appareil pour le traitement thermique
WO2006037459A1 (fr) * 2004-10-01 2006-04-13 Linde Aktiengesellschaft Procede de configuration d'atmospheres dans des traitements thermiques

Also Published As

Publication number Publication date
AU547114B2 (en) 1985-10-10
AU7598381A (en) 1982-05-06
DE3037643A1 (de) 1982-05-13
AT375679B (de) 1984-08-27
ATA129881A (de) 1984-01-15
ZA816859B (en) 1982-09-29
DE3169071D1 (en) 1985-03-28
EP0049488B1 (fr) 1985-02-20
BR8106371A (pt) 1982-07-13

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