EP0760396A1 - 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
EP0760396A1
EP0760396A1 EP96108286A EP96108286A EP0760396A1 EP 0760396 A1 EP0760396 A1 EP 0760396A1 EP 96108286 A EP96108286 A EP 96108286A EP 96108286 A EP96108286 A EP 96108286A EP 0760396 A1 EP0760396 A1 EP 0760396A1
Authority
EP
European Patent Office
Prior art keywords
protective gas
during
annealing
partial pressure
strip
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
EP96108286A
Other languages
German (de)
English (en)
Other versions
EP0760396B1 (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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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7770473&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0760396(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0760396A1 publication Critical patent/EP0760396A1/fr
Publication of EP0760396B1 publication Critical patent/EP0760396B1/fr
Application granted granted Critical
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 during the annealing of cold strip according to the preamble of claim 1.
  • Cold strip is annealed in the form of tight coils in pot, hood or roller continuous furnaces.
  • closed furnace systems such as. B. hood furnaces, especially high convection furnaces, often create diffusion welds, so-called band adhesives, between the turns of the cold strip. These cause an increased unwinding resistance in the roughing mill, which causes kinks or material tears on the strip surface.
  • 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 Hood furnace under N 2 - H 2 protective gas mixture with a maximum of 5% H 2 and addition of defined amounts of CO 2 instead.
  • 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 vol.%.
  • 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 to provide a method for avoiding the tape adhesive when annealing cold strip under protective gases with a proportion of hydrogen> 5%.
  • the homogeneous water gas reaction is unusable for controlling the method according to the invention.
  • 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.

Landscapes

  • 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)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
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 true EP0760396A1 (fr) 1997-03-05
EP0760396B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3575008A1 (fr) 2018-05-30 2019-12-04 Muhr und Bender KG Procédé permettant d'éviter le collage de bande à un matériau en bande laminé flexible

Families Citing this family (2)

* 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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4207394C1 (fr) * 1992-03-09 1993-02-11 Messer Griesheim Gmbh, 6000 Frankfurt, De

Family Cites Families (3)

* 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
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4207394C1 (fr) * 1992-03-09 1993-02-11 Messer Griesheim Gmbh, 6000 Frankfurt, De
EP0560172A1 (fr) * 1992-03-09 1993-09-15 Messer Griesheim Gmbh Procédé pour éviter le collage de bande d'acier pendant le recuit

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
O. PAWELSKI ET AL.: "Entstehung von Bandklebern .....", STAHL UND EISEN, vol. 109, no. 4, 27 February 1989 (1989-02-27), DUSSELDORF, DE, pages 178 - 184, XP002016935 *
R. A. ENGHOFER ET AL.: "Experience with 100% hydrogen .....", IRON AND STEEL ENGINEER, vol. 67, March 1990 (1990-03-01), PITTSBURGH, US, pages 25 - 29, XP000141232 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3575008A1 (fr) 2018-05-30 2019-12-04 Muhr und Bender KG Procédé permettant d'éviter le collage de bande à un matériau en bande laminé flexible
WO2019228985A1 (fr) 2018-05-30 2019-12-05 Muhr Und Bender Kg Procédé servant à éviter des colles pour bande sur du matériau en bande fabriqué par laminage flexible

Also Published As

Publication number Publication date
CA2183089A1 (fr) 1997-02-27
ATE212678T1 (de) 2002-02-15
EP0760396B1 (fr) 2002-01-30
SK108896A3 (en) 1997-03-05
DE59608666D1 (de) 2002-03-14
DE19531447A1 (de) 1997-02-27
CZ292244B6 (cs) 2003-08-13
EP0760396B2 (fr) 2005-03-23
SK282593B6 (sk) 2002-10-08
CZ247996A3 (en) 1997-03-12
US5785773A (en) 1998-07-28
BR9603545A (pt) 1998-05-19
MX9603468A (es) 1997-07-31
CA2183089C (fr) 2006-10-31

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