EP1050592A1 - Procédé de traitement thermique de pièces métalliques - Google Patents

Procédé de traitement thermique de pièces métalliques Download PDF

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Publication number
EP1050592A1
EP1050592A1 EP00109379A EP00109379A EP1050592A1 EP 1050592 A1 EP1050592 A1 EP 1050592A1 EP 00109379 A EP00109379 A EP 00109379A EP 00109379 A EP00109379 A EP 00109379A EP 1050592 A1 EP1050592 A1 EP 1050592A1
Authority
EP
European Patent Office
Prior art keywords
quenching
hydrogen
gas
helium
heat treatment
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.)
Ceased
Application number
EP00109379A
Other languages
German (de)
English (en)
Inventor
Ernst Dr.-Ing. Habil. Dipl.-Ing. Wandke
Paul Dipl.-Ing. Heilmann
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 Gas AG
Linde Technische Gase GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Linde Gas AG, Linde Technische Gase GmbH filed Critical Linde Gas AG
Publication of EP1050592A1 publication Critical patent/EP1050592A1/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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 for the heat treatment of metallic workpieces by heating up the workpieces and then quenching, the Quenching is performed with a cooling gas.
  • a generic method for the heat treatment of metallic workpieces is known from DE-PS 37 36 501. This is done in the furnace where the heat treatment takes place during quenching with helium, hydrogen or a Mixture of helium and hydrogen as cooling gas a cooling gas pressure p between 1 and 4 MPa set.
  • the cooling gas velocity v is set so that the product of the cooling gas pressure p and the cooling gas speed v between 10 and 250 MPa m / sec.
  • the heat treatment in a heat treatment furnace for example in a vacuum furnace, downstream quenching can either be in the furnace itself or a gas-tight chamber.
  • EP-A 0 869 189 describes a method for quenching metallic workpieces after a heat treatment, in which a cooling gas pressure p in the furnace or Quench chamber greater than 4 MPa (40 bar), preferably greater than 4 MPa and up to 5.5 MPa. This method also comes as cooling gas the gases or gas mixtures listed, and nitrogen or nitrogen-containing ones Mixtures for use.
  • the object of the present invention is a method for heat treatment specify metallic workpieces, especially with regard to the quenching process is optimized and by means of which the quality of the heat-treated metallic workpieces can be increased.
  • this is achieved by using CO, CO 2 , O 2 , H 2 S, H 2 O vapor, H 3 N, NO 3 , methanol, a saturated and / or unsaturated hydrocarbon as the cooling gas.
  • the method according to the invention is proposed that the Cooling gas nitrogen, helium, hydrogen or a mixture of helium and hydrogen is added.
  • the cold chamber coupled to a carburizing furnace particularly advantageous with a gas mixture consisting of half each Hydrogen and carbon monoxide.
  • a gas mixture consisting of half each Hydrogen and carbon monoxide.
  • excellent quenching behavior is not only achieved, it also arises during quenching itself a reducing effect on the quenched Workpiece.
  • This has not only improvements in terms of purity and Functionality of the workpiece surface, but also offers the advantage that the gas or gas mixture used for quenching without aftertreatment can be fed directly to a furnace as carbonization gas.
  • the H 2 / CO gas mixture mentioned is to be regarded as advantageous not only with regard to the quenching process but also with regard to the carburizing process, since this gas mixture represents an optimal atmosphere for carburizing case-hardening steels.
  • thermochemical treatment required reactive gas component in a concentration up to 50 vol .-%, preferably up to 15 vol .-% is added.
  • Carbon dioxide / helium cooling gas mixture has a reducing effect and through that Add 10 vol.% Carbon dioxide to nitrogen or 4 vol.% Oxygen to Hydrogen has an oxidizing effect.
  • the quenching process can be optimized and the quality of the heat treated metallic workpieces can be improved.
  • the required plant engineering Effort compared to the prior art processes not significantly enlarged.

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)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
EP00109379A 1999-05-03 2000-05-02 Procédé de traitement thermique de pièces métalliques Ceased EP1050592A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999120297 DE19920297A1 (de) 1999-05-03 1999-05-03 Verfahren zur Wärmebehandlung metallischer Werkstücke
DE19920297 1999-05-03

Publications (1)

Publication Number Publication Date
EP1050592A1 true EP1050592A1 (fr) 2000-11-08

Family

ID=7906811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00109379A Ceased EP1050592A1 (fr) 1999-05-03 2000-05-02 Procédé de traitement thermique de pièces métalliques

Country Status (2)

Country Link
EP (1) EP1050592A1 (fr)
DE (1) DE19920297A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2844809A1 (fr) * 2002-09-20 2004-03-26 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
FR2863628A1 (fr) * 2003-12-11 2005-06-17 Etudes Const Mecaniques Dispositif de trempe de pieces en acier
FR2869046A1 (fr) * 2004-04-19 2005-10-21 Francis Pelissier Procede de trempe sous gaz
WO2007031667A1 (fr) * 2005-09-16 2007-03-22 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Methode pour se premunir de la formation de monoxyde de carbone lors d'une operation de trempe gazeuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288803A (en) * 1941-10-10 1942-07-07 Socony Vacuum Oil Co Inc Metal treating
DE4208485C1 (fr) * 1992-03-17 1993-02-11 Joachim Dr.-Ing. 7250 Leonberg De Wuenning
US5373893A (en) * 1992-10-19 1994-12-20 International Business Machines Corporation Method and apparatus for cooling thermally massive parts in a continuous furnace
DE19709957A1 (de) * 1997-03-11 1998-09-17 Linde Ag Verfahren zur Gasabschreckung metallischer Werkstücke nach Wärmebehandlungen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767719C (de) * 1940-07-11 1953-04-09 Dortmund Hoerder Huettenver A Verfahren zum Abschrecken von Werkstuecken aus Eisen und Stahl
DE3736501C1 (de) * 1987-10-28 1988-06-09 Degussa Verfahren zur Waermebehandlung metallischer Werkstuecke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288803A (en) * 1941-10-10 1942-07-07 Socony Vacuum Oil Co Inc Metal treating
DE4208485C1 (fr) * 1992-03-17 1993-02-11 Joachim Dr.-Ing. 7250 Leonberg De Wuenning
US5373893A (en) * 1992-10-19 1994-12-20 International Business Machines Corporation Method and apparatus for cooling thermally massive parts in a continuous furnace
DE19709957A1 (de) * 1997-03-11 1998-09-17 Linde Ag Verfahren zur Gasabschreckung metallischer Werkstücke nach Wärmebehandlungen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2844809A1 (fr) * 2002-09-20 2004-03-26 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
WO2004027098A1 (fr) * 2002-09-20 2004-04-01 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de refroidissement rapide de pieces par transfert convectif et radiatif
KR100953818B1 (ko) * 2002-09-20 2010-04-21 레르 리키드 쏘시에떼 아노님 뿌르 레드 에렉스뿔라따시옹 데 프로세데 조르즈 클로드 가압된 냉각 기체를 사용한 금속 부품의 급속 냉각 방법 및 급속 냉각 장치
FR2863628A1 (fr) * 2003-12-11 2005-06-17 Etudes Const Mecaniques Dispositif de trempe de pieces en acier
WO2005066376A1 (fr) * 2003-12-11 2005-07-21 Etudes Et Constructions Mecaniques Dispositif de trempe de pièces en acier
FR2869046A1 (fr) * 2004-04-19 2005-10-21 Francis Pelissier Procede de trempe sous gaz
WO2005108629A1 (fr) * 2004-04-19 2005-11-17 Francis Pelissier Procede de trempe sous gaz
WO2007031667A1 (fr) * 2005-09-16 2007-03-22 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Methode pour se premunir de la formation de monoxyde de carbone lors d'une operation de trempe gazeuse
FR2890979A1 (fr) * 2005-09-16 2007-03-23 Air Liquide Methode pour se premunir de la formation de monoxyde de carbone lors d'une operation de trempe gazeuse

Also Published As

Publication number Publication date
DE19920297A1 (de) 2000-11-09

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