EP0673443B1 - 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 Download PDF

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Publication number
EP0673443B1
EP0673443B1 EP94901900A EP94901900A EP0673443B1 EP 0673443 B1 EP0673443 B1 EP 0673443B1 EP 94901900 A EP94901900 A EP 94901900A EP 94901900 A EP94901900 A EP 94901900A EP 0673443 B1 EP0673443 B1 EP 0673443B1
Authority
EP
European Patent Office
Prior art keywords
annealing
furnace
steel strip
purging
annealing furnace
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
EP94901900A
Other languages
German (de)
English (en)
Other versions
EP0673443B2 (fr
EP0673443A1 (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
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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
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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
    • 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 is annealed in the form of tight coils in, among other things, annealing furnaces with batch feed, such as in bell annealers.
  • N 2 -H 2 -, Ar-H 2 -, He-H 2 gas mixtures, exogas or pure hydrogen are usually used as protective gas.
  • hydrogen H 2
  • there are advantages such as faster time lapses, avoiding the oxidation of the steel strips or higher strip cleanliness.
  • the cleanliness of the steel strip in the annealing is determined by the evaporation behavior of the rolling oil or the rolling emulsion, quality, composition and flushing quantity of the protective gas as well as the annealing temperature.
  • the invention has for its object to provide a method that ensures high cleanliness of the steel strip heat-treated in annealing furnaces and optimizes the shielding gas consumption.
  • 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 inside the furnace or are determined empirically, for example, and if the limit values are exceeded or the furnace interior is flushed with a protective gas containing hydrogen if necessary, soot deposits are avoided, thereby improving the Surface quality of the steel strip is achieved.
  • 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.
  • part of the rolling oil / emulsion with a predominant C n H m content evaporates.
  • This phase ends when the cracking temperature is reached at approx. 450 ° C. Since the cracking temperature of the oil / emulsion between the edge and core of the coil is reached at different times, the oil that evaporates from the core cracks in the area of the warm, outer edges of the coil.
  • This phase is strongly influenced by the hydrogen as a protective gas atmosphere due to the better heating of the coil and chemical influences. The vapors are flushed out of the oven.
  • thermodynamic equilibria of the H 2 -CH 4 system formed can only be achieved in the holding time under constant temperature.
  • the CH 4 formation capacity depends on the amount of rolling oil / emulsion entered, ie it is very strongly dependent on the surface. Large surfaces of the annealing material cause correspondingly larger amounts of CH 4 or soot in the protective gas atmosphere.
  • thermodynamic conditions do not always allow a complete conversion of the carbon into CH 4 during the glow period.
  • Kp exp (- ⁇ G ° / RT) or 2.3 Lg
  • 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, which theoretically sets itself 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 method enables the annealing costs to be reduced and the quality of the products produced to be improved with an optimal rinsing design.

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  • 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)

Claims (7)

  1. Procédé de recuit sans dépôt de suie d'un feuillard d'acier souillé dans un four à recuit sous un gaz protecteur contenant de l'hydrogène, en procédant par les phases de chauffage, de maintien en température et de refroidissement, et pendant le recuit, on a une réaction entre H2 et les composants de carbone des impuretés de la surface de l'acier,
    caractérisé en ce que
    on commande une opération de rinçage pendant les phases de maintien en température et/ou de refroidissement suivant les valeurs limites thermodynamiques surveillées du système H2/CH4 pour que l'enthalpie libre du système soit toujours maintenue à une valeur négative.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    l'on surveille les valeurs limites thermodynamiques du système H2/CH4 et on procède au rinçage lorsque les valeurs limites sont dépassées vers le haut ou vers le bas.
  3. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on détermine les valeurs limites thermodynamiques du système H2/CH4 en fonction du temps et on commande l'opération de rinçage suivant cette fonction du temps.
  4. Procédé selon l'une des revendications 1 à 3,
    caractérisé en ce que
    le gaz de rinçage est de l'hydrogène pur à 100 %.
  5. Procédé selon l'une des revendications 1 à 4,
    caractérisé en ce que
    le four à recuit est un four à cloche de préférence un four à forte convection.
  6. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce que
    les impuretés de la surface de l'acier sont rincées avec des quantités maximales de gaz protecteur pendant la phase de réchauffage du four à recuit et cette opération de rinçage est commencée avec le début de la phase de réchauffage.
  7. Procédé selon l'une des revendications 2 à 6,
    caractérisé en ce que
    les grandeurs de régulation sont des valeurs déduites du système H2/CH4 comme par exemple la constante d'équilibre Kp, l'activité du carbone ac, l'enthalpie libre ΔG° ou encore une durée de rinçage prédéterminée.
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 EP0673443A1 (fr) 1995-09-27
EP0673443B1 true 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

Also Published As

Publication number Publication date
US5645655A (en) 1997-07-08
EP0673443B2 (fr) 2001-01-10
EP0673443A1 (fr) 1995-09-27
HRP931483A2 (hr) 1995-02-28
SI9300652B (sl) 2002-02-28
SI9300652A (en) 1994-06-30
HRP931483B1 (en) 1998-06-30
ATE149575T1 (de) 1997-03-15
WO1994013843A1 (fr) 1994-06-23
DE59305669D1 (de) 1997-04-10
ZA939267B (en) 1995-02-13
DE4241746C1 (de) 1994-08-25

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