EP0647726B1 - Procédé pour le traitement de pièces - Google Patents

Procédé pour le traitement de pièces Download PDF

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Publication number
EP0647726B1
EP0647726B1 EP94202679A EP94202679A EP0647726B1 EP 0647726 B1 EP0647726 B1 EP 0647726B1 EP 94202679 A EP94202679 A EP 94202679A EP 94202679 A EP94202679 A EP 94202679A EP 0647726 B1 EP0647726 B1 EP 0647726B1
Authority
EP
European Patent Office
Prior art keywords
parts
reaction gas
furnace
hardening
process according
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 - Lifetime
Application number
EP94202679A
Other languages
German (de)
English (en)
Other versions
EP0647726A1 (fr
Inventor
Hans-Peter Schmidt
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0647726A1 publication Critical patent/EP0647726A1/fr
Application granted granted Critical
Publication of EP0647726B1 publication Critical patent/EP0647726B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C23C8/18—Oxidising of ferrous surfaces
    • 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 treating Parts, especially steel and / or cast parts.
  • Steel parts are made using protective gases such as Nitrogen, nitrogen / propane mixture, endogas, exogas and the like in an oven to the respective austenitizing temperature warmed and by quenching agents hardened with any quenching speed (U.S. Patent 2,673,821).
  • protective gases such as Nitrogen, nitrogen / propane mixture, endogas, exogas and the like in an oven to the respective austenitizing temperature warmed and by quenching agents hardened with any quenching speed (U.S. Patent 2,673,821).
  • the invention has for its object a method to make parts blue during hardening.
  • the invention can be used for a subsequent oxidation treatment be dispensed with because the steel and / or castings a uniform, thin oxide layer (iron oxide) by introducing or spraying a reducing and at the same time oxidizing reaction gas in the Furnace space during the hardening process at the respective Get hardening temperature.
  • the simultaneous blueing and Hardening the parts increases the efficiency of the process.
  • they could be created the amount of hydrocarbons used in the flame curtain by feeding the reaction gas almost be halved.
  • the oxidizing Components such as water, carbon dioxide or air become the Soot formation due to incomplete combustion of the flame gases, for example of propane, greatly reduced, so that the cleaning intervals of the furnace room also grow.
  • a reducing and at the same time oxidizing reaction gas is fed into a hardening furnace via a known injector spray lance, thereby creating a gas atmosphere which has a slightly oxidizing effect.
  • the pure, liquid substances methanol and water as well as gaseous nitrogen are preferably mixed with the help of the injector spray lance and reach the hot part of the furnace, finely atomized, through the outlet holes. Due to the high furnace temperature, the liquid substances evaporate, whereby gaseous methanol splits into two parts hydrogen and one part carbon monoxide. Methanol fission gas is the reducing component, while water vapor is the oxidizing component.
  • Nitrogen is used to atomize the liquid substances and to dilute the oxidizing and reducing components of the gas atmosphere.
  • the hardened material is placed outside the furnace on a transport system and transported to the furnace chamber.
  • the parts are heated to the respective austenitizing temperature (860 - 940 ° C) and then suddenly fall into a quenching bath, especially an oil or salt bath.
  • a quenching bath especially an oil or salt bath.
  • the surface of the parts is easily oxidized by the water vapor in the gas atmosphere of the furnace. So that the oxidation of the parts does not already take place at low temperatures, the flame curtain, which is located in the lower part of the furnace inlet, is optimally adjusted, i.e.
  • the amount of propane or natural gas (hydrocarbons) is matched to the amount of reaction gas fed in so that the flame curtain binds oxygen, thus preventing early oxidation of the parts to be hardened.
  • the flame curtain is installed across the conveying direction.
  • the amounts of propane are 100-2000 l / h and the reaction gas amounts are 2-20 m 3 / h.
  • reaction gas nitrogen-methanol-water nitrogen-methanol-water. It is of course also with other reaction gases feasible which is a reducing and oxidizing Have component.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (4)

  1. Procédé pour le traitement de pièces, en particulier de pièces en acier et/ou de pièces de fonderie,
    caractérisé en ce que
    les pièces sont soumises à un processus commun d'oxydation (bleuissement) et de durcissement, dans un four, par introduction ou insufflation d'un gaz de réaction réducteur et oxydant, à des températures de durcissement, une atmosphère gazeuse légèrement oxydante étant créée dans l'enceinte du four.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on utilise un mélange eau-méthanol pour fabriquer le gaz de réaction.
  3. Procédé selon l'une des revendications 1 ou 2,
    caractérisé en ce qu'
    on utilise un liquide, insufflé avec de l'azote gazeux et dilué, pour produire le gaz de réaction.
  4. Procédé selon l'une des revendications 1 à 3,
    caractérisé en ce que
    le gaz de réaction est généré par insufflation dans la partie du four, dans laquelle les pièces se trouvent à la température finale de durcissement.
EP94202679A 1993-10-06 1994-09-16 Procédé pour le traitement de pièces Expired - Lifetime EP0647726B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4333940A DE4333940C1 (de) 1993-10-06 1993-10-06 Verfahren zum Behandeln von Teilen
DE4333940 1993-10-06

Publications (2)

Publication Number Publication Date
EP0647726A1 EP0647726A1 (fr) 1995-04-12
EP0647726B1 true EP0647726B1 (fr) 1999-12-08

Family

ID=6499463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202679A Expired - Lifetime EP0647726B1 (fr) 1993-10-06 1994-09-16 Procédé pour le traitement de pièces

Country Status (3)

Country Link
EP (1) EP0647726B1 (fr)
AT (1) ATE187504T1 (fr)
DE (2) DE4333940C1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19736514C5 (de) * 1997-08-22 2004-11-25 Messer Griesheim Gmbh Verfahren zum gemeinsamen Oxidieren und Wärmebehandeln von Teilen
DE19937186C1 (de) * 1999-08-06 2000-09-07 Mannesmann Sachs Ag Oxidationsbehandlung für Eisen enthaltende Metallteile, um diese mit einer Eisenoxid enthaltenden Oberflächenschicht zu versehen sowie behandeltes Metallteil
DE10156326B4 (de) * 2001-11-19 2004-02-12 Schilling, Jörg, Dipl.-Ing. Verfahren zur Oberflächendekoration und zum Oberflächenhärten von ferrometallischen Teilen
DE10235131A1 (de) 2002-08-01 2004-02-19 Ipsen International Gmbh Verfahren und Vorrichtung zum Schwärzen von Bauteilen
DE102010032919B4 (de) * 2010-07-30 2023-10-05 Air Liquide Deutschland Gmbh Verfahren und Vorrichtung zum Befeuchten eines brennbaren Gases
ITMI20110366A1 (it) 2011-03-10 2012-09-11 Sol Spa Procedimento per il trattamento di acciai.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673821A (en) * 1950-11-18 1954-03-30 Midwest Research Inst Heat treatment of steel in a protective atmosphere

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918933C (de) * 1950-07-27 1954-10-07 Robert Von Linde Dipl Ing Verfahren zur Herstellung eines brennbaren Blankgluehgases
JP2590182B2 (ja) * 1987-03-07 1997-03-12 株式会社東芝 黒化炉およびこの黒化炉を使用したシャドウマスクの製造方法
GB2233672A (en) * 1989-06-30 1991-01-16 Shell Int Research High temperature treatment of stainless steals used in high temperature reactors
GB2234530A (en) * 1989-06-30 1991-02-06 Shell Int Research Heat treatment of high temperature steels

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673821A (en) * 1950-11-18 1954-03-30 Midwest Research Inst Heat treatment of steel in a protective atmosphere

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
R. ERNST: "Wörterbuch der industriellen Technik, Band II Englisch-Deutsch" , S. 111, OSCAR BRANDSTETTER VERLAG, WIESBADEN (DE) *

Also Published As

Publication number Publication date
DE59408983D1 (de) 2000-01-13
EP0647726A1 (fr) 1995-04-12
DE4333940C1 (de) 1994-12-08
ATE187504T1 (de) 1999-12-15

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