EP0673443A1 - Procede de recuit sans formation de suie de feuillards d'acier dans un four a recuit. - Google Patents

Procede de recuit sans formation de suie de feuillards d'acier dans un four a recuit.

Info

Publication number
EP0673443A1
EP0673443A1 EP94901900A EP94901900A EP0673443A1 EP 0673443 A1 EP0673443 A1 EP 0673443A1 EP 94901900 A EP94901900 A EP 94901900A EP 94901900 A EP94901900 A EP 94901900A EP 0673443 A1 EP0673443 A1 EP 0673443A1
Authority
EP
European Patent Office
Prior art keywords
annealing furnace
annealing
furnace
during
steel 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
EP94901900A
Other languages
German (de)
English (en)
Other versions
EP0673443B2 (fr
EP0673443B1 (fr
Inventor
Gerhard Gross
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.)
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6474973&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0673443(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 EP0673443A1 publication Critical patent/EP0673443A1/fr
Application granted granted Critical
Publication of EP0673443B1 publication Critical patent/EP0673443B1/fr
Publication of EP0673443B2 publication Critical patent/EP0673443B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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

Definitions

  • the invention relates to a method for soot-free annealing of steel strip in an annealing furnace according to the preamble of claim 1.
  • the steel strip in the form of tight coils is used, among other things, in annealing furnaces with batch feeding, e.g. annealed in bell-type furnaces.
  • Shielding gas are usually used N 2 -H 2 -, Ar-H 2 -, He-H 2 gas mixtures, exogas or pure hydrogen.
  • the cleanliness of the steel strip in the annealing is determined by the evaporation behavior of the rolling oil or the rolling emulsion, the quality, composition and purge quantity of the protective gas as well as the annealing temperature. Due to the long dwell times in the annealing process, here
  • the invention has for its object to provide a method that ensures high cleanliness of the steel strip heat-treated in annealing furnaces and the
  • the flushing initiated by the method according to the invention enables the steel strip to be cleaned with optimized shielding gas consumption. Since limit values of the H 2 - CH 4 protective gas system are monitored or, for example, empirically determined inside the furnace and if the furnace interior is flushed with a protective gas containing hydrogen if necessary, when exceeding the limit values, soot deposits are avoided, which improves the Surface quality of the steel strip is achieved.
  • control variables are values derived directly or indirectly from the H 2 -CH 4 system formed or thermodynamically dependent points in time from the H 2 -CH 4 system. If the specified limit values are exceeded or undershot, an inert gas purge, preferably with pure hydrogen, is automatically initiated.
  • the invention is explained below using an exemplary embodiment and theoretical considerations based on an H 2 -containing protective gas atmosphere and the drawing.
  • the drawing shows the possible monitoring variants of the cleaning process in the annealing furnace with batch feed, preferably in a hood furnace, in which the protective gas atmosphere of the furnace interior is monitored during at least one of the heating, holding, and cooling phases.
  • Values derived directly or indirectly from the H 2 -CH 4 system formed are recorded as control variables, or thermodynamically dependent points in time are determined from the H 2 -CH 4 system, and an inert gas purge is automatically initiated when specified limit values are exceeded or fallen below.
  • the limit is determined by the cracking temperature, which is different from the variety.
  • thermodynamic equilibria of the H 2 -CH 4 system formed can only be achieved in the holding time under constant temperature.
  • the CH 4 educational capacity depends on the registered
  • thermodynamic conditions do not always allow a complete conversion of the carbon into CH 4 during the glow period.
  • the prerequisite is that the protective gas purging process begins immediately after the hood has been rendered inert, i.e. simultaneously with the start of the heating phase. For physical reasons (high thermal conductivity of the hydrogen), a max. Shielding gas volume provided.
  • the inert gas volume flow is reduced or the hood is kept under pressure.
  • the oven is therefore a max. Volume flow supplied.
  • the methane (CH 4 ) formed and the emulsion / oil vapors are flushed out of the oven in this phase.
  • a phase begins which, for thermodynamic reasons, causes the annealing material to be cleaned. This phase is preferably monitored in order not to allow soot failure. The possible variants of the monitoring are shown in the drawing.
  • the hood is under pressure - the outlet is closed and the inlet is open.
  • the CH 4 and / or the H 2 content is continuously analyzed via a direct measurement in the furnace atmosphere.
  • the CH 4 and / or H 2 measuring device has an adjustable min-max contact.
  • the Xmax. Value corresponds to the CH 4 concentration tration, which theoretically appears as a limit in H 2 -CH 4 - equilibrium systems, ie no methane decay.
  • the furnace outlet is opened. Methane is extracted from the furnace with a max. Volume flow rinsed out. Depending on the size of the oven, the necessary rinsing process takes 0.5 to 1.5 hours.
  • the outlet is then closed and the cleaning, ie carbon conversion, continues.
  • the flushing in this phase is carried out only intermittently as required in the H 2 - CH 4 equilibrium system.
  • the basic solution of the monitoring system described is based on a CH 4 and / or H 2 measurement.
  • Other control variables for monitoring the soot failure ie opening the outlet valve and protective gas purging, can - ac - the carbon potential of the furnace atmosphere, - K - the equilibrium constant
  • the method according to the invention by means of this monitoring of the annealing process, the interior of the furnace is only rinsed if the limit values shown in the drawing and described above are exceeded, the method enables the annealing costs to be reduced and the quality of the products produced to be improved with an optimal rinsing design.

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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP94901900A 1992-12-11 1993-11-27 Procede de recuit sans formation de suie de feuillards d'acier dans un four a recuit Expired - Lifetime EP0673443B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4241746A DE4241746C1 (de) 1992-12-11 1992-12-11 Verfahren zum rußfreien Glühen von Stahlband in einem Glühofen
DE4241746 1992-12-11
PCT/EP1993/003334 WO1994013843A1 (fr) 1992-12-11 1993-11-27 Procede de recuit sans formation de suie de feuillards d'acier dans un four a recuit

Publications (3)

Publication Number Publication Date
EP0673443A1 true EP0673443A1 (fr) 1995-09-27
EP0673443B1 EP0673443B1 (fr) 1997-03-05
EP0673443B2 EP0673443B2 (fr) 2001-01-10

Family

ID=6474973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94901900A Expired - Lifetime EP0673443B2 (fr) 1992-12-11 1993-11-27 Procede de recuit sans formation de suie de feuillards d'acier dans un four a recuit

Country Status (8)

Country Link
US (1) US5645655A (fr)
EP (1) EP0673443B2 (fr)
AT (1) ATE149575T1 (fr)
DE (2) DE4241746C1 (fr)
HR (1) HRP931483B1 (fr)
SI (1) SI9300652B (fr)
WO (1) WO1994013843A1 (fr)
ZA (1) ZA939267B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19840778A1 (de) * 1998-09-07 2000-03-09 Messer Griesheim Gmbh Verfahren und Vorrichtung zur Reinigung von Metalloberflächen
EP1996737A2 (fr) * 2006-02-06 2008-12-03 Hyradix Inc. Procedes de recuit en lot a reformeur integre et appareils correspondants
CN107828959A (zh) * 2017-11-20 2018-03-23 山西太钢不锈钢股份有限公司 减少高等级热轧磁轭钢表面色差的罩式炉吹氢方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531333A (en) * 1968-06-24 1970-09-29 Wilson Lee Eng Co Inc Method of heat treating steel strip or the like
DE3406792A1 (de) * 1984-02-24 1985-08-29 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum gluehen von metallteilen
DE3631551C1 (en) * 1986-09-17 1987-11-19 Messer Griesheim Gmbh Process for avoiding black annealing edges in the annealing of steel strip
DD275707A1 (de) † 1988-09-26 1990-01-31 Bke Hermann Matern Veb Verfahren zur minimierung von kohlenstoffhaltigen belaegen beim gluehen von festbunden
DD284903A5 (de) * 1989-06-13 1990-11-28 Veb Bandstahlkombinat "Hermann Matern",Dd Verfahren zur erhoehung der anlagenkapazitaet von haubengluehoefen beim gluehen von festbunden
DE3921321A1 (de) * 1989-06-29 1991-01-10 Hoesch Stahl Ag Verfahren zum gluehen von duennem stahlblech

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9413843A1 *

Also Published As

Publication number Publication date
EP0673443B2 (fr) 2001-01-10
ATE149575T1 (de) 1997-03-15
ZA939267B (en) 1995-02-13
SI9300652A (en) 1994-06-30
DE4241746C1 (de) 1994-08-25
US5645655A (en) 1997-07-08
WO1994013843A1 (fr) 1994-06-23
EP0673443B1 (fr) 1997-03-05
HRP931483B1 (en) 1998-06-30
HRP931483A2 (hr) 1995-02-28
SI9300652B (sl) 2002-02-28
DE59305669D1 (de) 1997-04-10

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