EP0760396B1 - Procédé pour éviter le collage de bande d'acier pendant le recuit - Google Patents

Procédé pour éviter le collage de bande d'acier pendant le recuit Download PDF

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Publication number
EP0760396B1
EP0760396B1 EP96108286A EP96108286A EP0760396B1 EP 0760396 B1 EP0760396 B1 EP 0760396B1 EP 96108286 A EP96108286 A EP 96108286A EP 96108286 A EP96108286 A EP 96108286A EP 0760396 B1 EP0760396 B1 EP 0760396B1
Authority
EP
European Patent Office
Prior art keywords
gas
protective gas
hydrogen
reaction
protective
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
EP96108286A
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German (de)
English (en)
Other versions
EP0760396A1 (fr
EP0760396B2 (fr
Inventor
Peter Zylla
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.)
Air Liquide Deutschland 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
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Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0760396A1 publication Critical patent/EP0760396A1/fr
Application granted granted Critical
Publication of EP0760396B1 publication Critical patent/EP0760396B1/fr
Publication of EP0760396B2 publication Critical patent/EP0760396B2/fr
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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
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/667—Multi-station furnaces
    • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
    • 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 avoiding adhesives when annealing cold strip according to the preamble of the claim 1.
  • Cold strip is in the form of tight coils in pot, hood or Continuous-flow furnaces annealed.
  • closed furnace systems such as B. hood furnaces
  • High convection ovens arise between the turns of the cold strip often diffusion welding, so - called Tape adhesive.
  • DE 42 07 394 C1 describes a method for avoiding this tape adhesive.
  • the surface of the cold strip wound into coils above 600 ° C is covered with a thin cover layer, which prevents the coils from sticking, by means of defined oxidation processes.
  • this top layer is removed by reducing the oxides. This is done by changing the water gas balance.
  • the entire annealing process takes place in an annealing furnace, in particular a hood furnace, under a N 2 - H 2 protective gas mixture with a maximum of 5% H 2 and addition of defined amounts of CO 2 .
  • the reaction between hydrogen and carbon dioxide causes intense water vapor formation, which depends on the thermodynamic state of the system. It is favored by a high H 2 or CO 2 concentration and high temperatures.
  • Table 2 and Figure 2 show z.
  • B the temperature-dependent change in concentration in a starting mixture of 5% H 2 and 1% CO 2 .
  • the H 2 O and CO curves coincide.
  • the temperature is plotted on the abscissa and the concentration of the gas fractions on the ordinate.
  • the formation of water vapor increases with increasing temperature. At 700 ° C these values are still below 1% by volume.
  • a higher CO 2 concentration in the starting mixture increases the water vapor formation up to approx. 2 Vot.%.
  • the amount of CO 2 is fixed and depends on the treated annealing surface.
  • a corresponding oxidizing ratio of the CO 2 and CO partial pressures is achieved by changing the stationary equilibrium of the water gas reaction. This is achieved through a higher throughput of the protective gas.
  • the invention has for its object a method for Avoid the tape glue when glowing cold strip underneath Shielding gases with a share of hydrogen> 5% create.
  • Oxygen partial pressure resulting from this reaction is adjusted in the protective gas atmosphere as required.
  • the process of covering the strip surface with a cover layer, which prevents the turns from sticking, is carried out under a defined O 2 partial pressure. This can be defined as the quotient of the partial pressures (P) of CO 2 and CO and must not be less than 1 during the oxidation process above 600 ° C.
  • the changes in the oxygen partial pressure (PO 2 ) are shown graphically in FIG. PO 2 is shown here as a logarithmic function depending on the temperature and time.
  • the phase of the CO 2 admixture can be clearly seen here. This ends when the cooling phase begins. Cover layers constructed in this way with a CO 2 quantity of 0.3 to 0.6 g per m 2 of annealing material surface prevent the individual turns from sticking in the coil. A strong reducing power of the hydrogen in the cooling phase ensures that this top layer is broken down below 600 ° C.
  • the methane content in the last phase of the holding time, before the addition of CO 2 must not exceed a concentration of approximately 2% by volume of the protective gas atmosphere.
  • a concentration of approximately 2% by volume of the protective gas atmosphere are treated with the inventive method low carbon and sensitive to carburizing steels z.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Claims (3)

  1. Procédé pour éviter les adhérences dans le recuit d'une bande d'acier dans un four à hotte, de préférence avec une convection élevée, sous un gaz protecteur, constitué de plus de 5 % à 100 % d'hydrogène, le reste étant de l'azote, avec les phases de chauffage, arrêt et refroidissement,
    caractérisé en ce qu'
    au cours du temps d'arrêt on recouvre la bande d'acier par oxydation à des températures supérieures à 600°C avec une couche de revêtement mince, en établissant un rapport de pression partielle oxydante P(CO2)/P(CO) > 1 par ajout au mélange de 0,3 g à 0,6 g d'anhydride carbonique et par m2 de surface de matière recuite, dans ce gaz protecteur, et en assurant une forte perturbation de l'équilibre thermodynamique des réactions homogènes du gaz à l'eau (K << 0,01) grâce à des vitesses d'écoulement élevées du gaz protecteur.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    au cours de la phase de refroidissement à des températures inférieures à 600°C on établit par la force de réduction de l'hydrogène une pression partielle de P(CO2)/P(CO) < 1 pour la réduction de la couche de recouvrement.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    par la réaction du carbone et de l'hydrogène selon l'équation chimique H2 + C = CH4 on règle le méthane formé dans la phase de chauffage, avant l'ajout du CO2 au mélange, à une proportion inférieure à 2 % en volume dans le gaz protecteur, en abaissant le niveau de carbone dans l'atmosphère de gaz protecteur à 0,003 %.
EP96108286A 1995-08-26 1996-05-24 Procédé pour éviter le collage de bande d'acier pendant le recuit Expired - Lifetime EP0760396B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19531447 1995-08-26
DE19531447A DE19531447A1 (de) 1995-08-26 1995-08-26 Verfahren zum Vermeiden von Klebern beim Glühen von Kaltband

Publications (3)

Publication Number Publication Date
EP0760396A1 EP0760396A1 (fr) 1997-03-05
EP0760396B1 true EP0760396B1 (fr) 2002-01-30
EP0760396B2 EP0760396B2 (fr) 2005-03-23

Family

ID=7770473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108286A Expired - Lifetime EP0760396B2 (fr) 1995-08-26 1996-05-24 Procédé pour éviter le collage de bande d'acier pendant le recuit

Country Status (8)

Country Link
US (1) US5785773A (fr)
EP (1) EP0760396B2 (fr)
AT (1) ATE212678T1 (fr)
BR (1) BR9603545A (fr)
CA (1) CA2183089C (fr)
CZ (1) CZ292244B6 (fr)
DE (2) DE19531447A1 (fr)
SK (1) SK282593B6 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10162702C1 (de) * 2001-12-19 2003-04-17 Messer Griesheim Gmbh Verfahren zur Vermeidung von Klebern und Kratzern beim Rekristallisationsglühen von Kaltband
DE10255590A1 (de) * 2002-11-28 2004-06-17 Messer Griesheim Gmbh Verfahren zum kleberfreien Glühen von Metallteilen
EP3575008B1 (fr) * 2018-05-30 2022-08-24 Muhr und Bender KG Procédé permettant d'éviter le collage de bande à un matériau en bande laminé flexible

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR666903A (fr) * 1928-06-29 1929-10-08 Perfectionnements aux procédés de recuit désoxydant et analogue des produits métalliques
US1815505A (en) * 1929-11-15 1931-07-21 Oscar J Wilbor Bright annealing of metals

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE560172C (de) * 1932-09-29 August Loeffler Gasbeheizung fuer Raeucherkammern und Backoefen
DE4207394C1 (fr) * 1992-03-09 1993-02-11 Messer Griesheim Gmbh, 6000 Frankfurt, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR666903A (fr) * 1928-06-29 1929-10-08 Perfectionnements aux procédés de recuit désoxydant et analogue des produits métalliques
US1815505A (en) * 1929-11-15 1931-07-21 Oscar J Wilbor Bright annealing of metals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Gas, Warme-international", Band 33 (1984), Heft 10, Oktober, Seiten 490-497. *

Also Published As

Publication number Publication date
CZ247996A3 (en) 1997-03-12
EP0760396A1 (fr) 1997-03-05
SK108896A3 (en) 1997-03-05
DE59608666D1 (de) 2002-03-14
MX9603468A (es) 1997-07-31
SK282593B6 (sk) 2002-10-08
BR9603545A (pt) 1998-05-19
EP0760396B2 (fr) 2005-03-23
DE19531447A1 (de) 1997-02-27
ATE212678T1 (de) 2002-02-15
CA2183089C (fr) 2006-10-31
US5785773A (en) 1998-07-28
CZ292244B6 (cs) 2003-08-13
CA2183089A1 (fr) 1997-02-27

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