EP0311030A1 - Process for annealing metallic work pieces in a continuous furnace - Google Patents
Process for annealing metallic work pieces in a continuous furnace Download PDFInfo
- Publication number
- EP0311030A1 EP0311030A1 EP88116437A EP88116437A EP0311030A1 EP 0311030 A1 EP0311030 A1 EP 0311030A1 EP 88116437 A EP88116437 A EP 88116437A EP 88116437 A EP88116437 A EP 88116437A EP 0311030 A1 EP0311030 A1 EP 0311030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- annealing
- hydrogen
- protective gas
- continuous
- nitrogen
- 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.)
- Withdrawn
Links
- 238000000137 annealing Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 31
- 239000001257 hydrogen Substances 0.000 claims abstract description 23
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims description 21
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 17
- 239000000428 dust Substances 0.000 abstract description 10
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 150000002431 hydrogen Chemical class 0.000 abstract description 5
- 239000002244 precipitate Substances 0.000 abstract 1
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- C21D1/74—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
- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
-
- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/565—Sealing arrangements
Definitions
- the invention relates to a method for annealing metal parts in continuous furnaces under a protective gas atmosphere.
- Annealing of metal parts is often carried out in a reducing protective gas atmosphere. It is generally known to carry out an annealing process with a protective gas atmosphere generated from ammonia. This atmosphere is generated by catalytic decomposition of ammonia (NH3) and contains 75 vol% hydrogen and 25 vol% nitrogen. With this protective gas and this protective gas production, it is possible to carry out high-quality and economically favorable annealing processes.
- a protective gas atmosphere generated from ammonia. This atmosphere is generated by catalytic decomposition of ammonia (NH3) and contains 75 vol% hydrogen and 25 vol% nitrogen.
- the object of the invention is now to provide an annealing process for continuous furnaces, which improves the economy of these furnaces with special attention to the problem of white dust.
- the inlet and outlet openings of a continuous furnace are preceded by chambers which are filled with inert gas, e.g. Nitrogen.
- inert gas e.g. Nitrogen
- the upstream, rinsed lock chamber protects the furnace against the ingress of air. It is then possible to insert the one into the oven To reduce the amount of protective gas, pure hydrogen according to the invention. Due to the relatively high price of hydrogen (more than twice as expensive as nitrogen), this leads to an improvement in the economics of the process.
- the figure shows a continuous furnace for recrystallizing bright annealing of stainless steel strips. It is known to operate such continuous furnaces with ammonia cracked gas or with a corresponding supply gas mixture of nitrogen and hydrogen, which is supplied through the protective gas supply opening 1. This is located between the annealing chamber 2 and the cooling zone 3 of the continuous furnace. Typical amounts of protective gas for operating such a furnace are in the range of about 100 to 300 m3 / h. According to the invention, an equal amount of pure hydrogen must now be supplied without using the upstream chambers 4. If upstream chambers are attached according to the sketch, the hydrogen protective gas supply can be reduced by 20 to 50%.
- the use of hydrogen leads to a substantial extension of the intervals between two necessary cleaning of the cooling zone 3 and in particular the heat exchanger of the continuous furnace.
- the remaining white dust formation is likely due to nitrogen entering the treatment zone from the prechamber and others Sources of nitrogen - small leaks.
- the method according to the invention nevertheless provides a significant improvement in the economy of annealing in continuous furnaces.
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)
- Furnace Details (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Glühen von Metallteilen in Durchlauföfen unter einer Schutzgasatmospäre.The invention relates to a method for annealing metal parts in continuous furnaces under a protective gas atmosphere.
Glühen von Metallteilen, insbesondere Blankglühen, wird häufig in reduzierenden Schutzgasatmosphären durchgeführt. Allgemein bekannt ist dabei die Durchführung eines Glühverfahrens mit einer aus Ammoniak erzeugten Schutzgasatmosphäre. Diese Atmosphäre wird durch katalytische Spaltung von Ammoniak (NH₃) erzeugt und enthält 75 Vol-% Wasserstoff und 25 Vol-% Stickstoff. Mit diesem Schutzgas und dieser Schutzgasherstellung ist es möglich, qualitativ gute und wirtschaftlich günstige Glühverfahren durchzuführen.Annealing of metal parts, especially bright annealing, is often carried out in a reducing protective gas atmosphere. It is generally known to carry out an annealing process with a protective gas atmosphere generated from ammonia. This atmosphere is generated by catalytic decomposition of ammonia (NH₃) and contains 75 vol% hydrogen and 25 vol% nitrogen. With this protective gas and this protective gas production, it is possible to carry out high-quality and economically favorable annealing processes.
Aufgrund gesunkener Preise für angelieferte Gase sind aber bereits heute viele Wärmebehandlungsverfahren bekannt, bei denen Schutzgasatmosphären eingesetzt werden, die nicht in Gasgeneratoren vor Ort erzeugt sondern aus Liefergasen hergestellt werden. So ist auch bekannt, ein dem Ammoniakspaltgas entsprechendes Schutzgas mittels geliefertem reinem Wasserstoff und Stickstoff zu erzeugen. Aufgrund des getrennten Vorhandenseins von Stickstoff und Wasserstoff ist nun auch die Verwendung von anderen Schutzgaszusammensetzungen als die von Ammoniakspaltgas leicht möglich. Dabei bilden zwei grundlegende Gesichtspunkte den Hintergrund: Einerseits wird ein Schutzgasgemisch bei Verwendung hoher Stickstoffanteile kostengünstiger, wobei aber anderseits dem Schutzgas Eigenschaften, die auf den Wasserstoff zurückgehen, wie z.B. bessere Wärmeleitfähigkeit und daraus resultierend kürzere Aufheiz- und Abkühldauern im Ofen, verloren gehen. Diese Vorteile von Wasserstoff haben in speziellen Fällen, z.B. bei Glühbehandlungen in Haubenöfen (siehe z.B. DE-PS 31 05 064, insbesondere im Stand der Technik) dazu geführt, daß Schutzgas- atmosphären mit 100 % Wasserstoff verwendet werden.However, due to lower prices for supplied gases, many heat treatment processes are already known in which protective gas atmospheres are used, which are not generated in gas generators on site but are produced from supply gases. It’s like that known to generate a protective gas corresponding to the ammonia cracked gas by means of pure hydrogen and nitrogen supplied. Due to the separate presence of nitrogen and hydrogen, the use of protective gas compositions other than that of ammonia cracked gas is now easily possible. Two fundamental aspects form the background: On the one hand, a protective gas mixture becomes cheaper when using high nitrogen contents, but on the other hand properties of the protective gas that are due to the hydrogen, such as better thermal conductivity and the resulting shorter heating and cooling times in the furnace, are lost. In special cases, for example in annealing treatments in bell-type furnaces (see for example DE-PS 31 05 064, in particular in the prior art), these advantages of hydrogen have led to the use of protective gas atmospheres with 100% hydrogen.
Im Gegensatz dazu besteht in der Fachwelt das Urteil, daß bei Durchlauföfen, die wegen der zu spülenden Einlaß- und Auslaßoffnungen eine besonders große Schutzgasmenge benötigen, der Einsatz einer 100%-Wasserstoffatmosphäre aus Kostengründen nicht sinnvoll ist.In contrast, there is a judgment among experts that in continuous furnaces that require a particularly large amount of protective gas because of the inlet and outlet openings to be flushed, the use of a 100% hydrogen atmosphere is not sensible for reasons of cost.
Bei der Gestaltung eines Wärmebehandlungsverfahrens mit Stickstoff-Wasserstoff-Schutzgasgemischen ist neben den jetzt genannten Möglichkeiten und Gesichtspunkten noch ein der Fachwelt wohlbekanntes aber noch nicht vollständig aufgeklärtes Phänomen zu berücksichtigen. Es ensteht bei der Durchführung derartiger Glühverfahren mit Stickstoff-Wasserstoff-Atmosphären, wobei z.B. Stahlbleche oder Edelstahlbleche geglüht werden, eine als "weißer Staub" bezeichnete pulverförmige Substanz, die im wesentlichen wahrscheinlich aus Bornitriden und Boraminoverbindungen besteht. Diese Verbindungen lagern sich insbesondere im Kühlbereich von Durchlauföfen ab, da dort das Schutzgas mit Hilfe von Wärmetauschern abgekühlt wird, wobei diese Verbindungen aus dem Schutzgas desublimieren.When designing a heat treatment process with nitrogen-hydrogen-protective gas mixtures, in addition to the options and points of view that have just been mentioned, a phenomenon that is well-known but not yet fully understood by experts is to be taken into account. It arises when such annealing processes are carried out with nitrogen-hydrogen atmospheres, for example Steel sheets or stainless steel sheets are annealed, a powdery substance referred to as "white dust", which is likely to consist essentially of boron nitrides and boramino compounds. These compounds are deposited in particular in the cooling area of continuous furnaces, since the protective gas is cooled there with the aid of heat exchangers, and these compounds desublimate from the protective gas.
Die Bildung und Ablagerung des weißen Staubes insbesondere in den Wärmetauschern von Durchlauföfen führt zu einer schnellen und beträchtlichen Abnahme der Kühlleistung in den Kühlzonen der Öfen und somit insgesamt zu einer Verringerung des Durchsatzes an zu behandelndem metallischem Gut. Deshalb muß auch in mehr oder weniger regelmäßigen Abständen eine Reinigung der Wärmetauscher der Öfen durchgeführt werden, um ein Absinken der Kühlleistung auf nicht mehr tolerierbare Werte zu vermeiden. Dies bedeutet, daß aufgrund des weißen Staubes zusätzliche Stillstandszeiten insbesondere bei Durchlauföfen entstehen.The formation and deposition of the white dust, particularly in the heat exchangers of continuous furnaces, leads to a rapid and considerable decrease in the cooling capacity in the cooling zones of the furnaces and thus overall to a reduction in the throughput of metallic material to be treated. For this reason, the heat exchangers of the ovens must also be cleaned at more or less regular intervals in order to prevent the cooling capacity from dropping to unacceptable values. This means that due to the white dust, additional downtimes occur, particularly with continuous furnaces.
Die Aufgabe der Erfindung besteht nun darin, ein Glühverfahren für Durchlauföfen anzugeben, das die Wirtschaftlichkeit dieser Öfen unter besonderer Berücksichtigung des Problems des weißen Staubes verbessert.The object of the invention is now to provide an annealing process for continuous furnaces, which improves the economy of these furnaces with special attention to the problem of white dust.
Diese Aufgabe wird erfindungsgemäß gelöst, daß als Schutzgas reiner Wasserstoff verwendet wird.This object is achieved in that pure hydrogen is used as the protective gas.
Durch die Verwendung von reinem Wasserstoff wird die Entstehung von weißem Staub erheblich verringert.The use of pure hydrogen considerably reduces the generation of white dust.
Dadurch werden zwar kostenmäßige Nachteile von Wasserstoff gegenüber Stickstoff-Wasserstoff-Gemischen in Kauf genommen, es ergibt sich jedoch durch die Verringerung des weißen Staubes eine erhebliche Verlängerung der Zeit zwischen zwei Betriebsunterbrechungen. Der weiße Staub kann mit reiner Wasserstoffatmosphäre wahrscheinlich deshalb reduziert werden, da seine Entstehung auf die katalytische Bildung von Ammoniak, aus der normalerweise verwendeten Stickstoff-Wasserstoff-Atmosphäre und der anschließenden Weiterreaktion mit Bor aus dem behandelten metallischen Gut zurückgeht. Die Verwendung einer reinen H₂-Atmosphäre schließt daher die Bildung von Ammoniak und dessen Folgeprodukte aus. Somit wird mit einer verhältnismäßig einfachen technischen Maßnahme, die aber der allgemeinen Ansicht der Fachwelt zuwiderhandelt, ein schwerwiegendes Problem beim Glühen in Durchlauföfen beseitigt. Bei diskontinuierlich arbeitenden Wärmebehandlungsöfen ist dieses Problem von geringerer Relevanz, da derartige Anlagen entsprechend ihrer Konzeption sowieso zum Chargenwechsel heruntergefahren werden und somit eine Reinigung zwischen zwei Arbeitsgängen jederzeit möglich ist.Although this does accept the cost disadvantages of hydrogen compared to nitrogen-hydrogen mixtures, the reduction in white dust results in a considerable increase in the time between two business interruptions. The white dust can probably be reduced with a pure hydrogen atmosphere because its formation is due to the catalytic formation of ammonia, from the normally used nitrogen-hydrogen atmosphere and the subsequent further reaction with boron from the treated metallic material. The use of a pure H₂ atmosphere therefore excludes the formation of ammonia and its secondary products. Thus, a relatively simple technical measure, which is contrary to the general view of the professional world, eliminates a serious problem with annealing in continuous furnaces. This problem is of less relevance in the case of discontinuously operating heat treatment furnaces, since such systems are shut down to change batches anyway according to their design, and cleaning between two work steps is therefore possible at any time.
In einer vorteilhaften Ausgestaltungsmöglichkeit des erfindungsgemäßen Verfahrens werden der Eintritts- und der Ausstrittsöffnung eines Durchlaufofens Kammern vorgeschaltet, die mit Inertgas, z.B. Stickstoff, gespült werden.In an advantageous embodiment of the method according to the invention, the inlet and outlet openings of a continuous furnace are preceded by chambers which are filled with inert gas, e.g. Nitrogen.
Durch die vorgeschaltete, gespülte Schleusenkammer wird der Ofen gegen Eindringen von Luft abgesichert. Es ist dann möglich, die in den Ofen einzuführende Schutzgasmenge, erfindungsgemäß reiner Wasserstoff, zu reduzieren. Dies führt aufgrund des relativ hohen Preises von Wasserstoff (mehr als doppelt so teuer wie z.B. Stickstoff) zu einer Verbesserung der Wirtschaftlichkeit des Verfahrens.The upstream, rinsed lock chamber protects the furnace against the ingress of air. It is then possible to insert the one into the oven To reduce the amount of protective gas, pure hydrogen according to the invention. Due to the relatively high price of hydrogen (more than twice as expensive as nitrogen), this leads to an improvement in the economics of the process.
Im folgenden soll anhand der schematischen Zeichnung das erfindungsgemäße Verfahren näher erläutert werden.The method according to the invention will be explained in more detail below with the aid of the schematic drawing.
Die Figur zeigt einen Durchlaufofen zum rekristallisierenden Blankglühen von Edelstahlblechbändern. Es ist bekannt, derartige Durchlauföfen mit Ammoniakspaltgas oder mit einer entsprechenden Liefergasmischung aus Stickstoff und Wasserstoff zu betreiben, das durch die Schutzgaszuführungsöffnung 1 zugeführt wird. Diese befindet sich zwischen der Glühkammer 2 und der Kühlzone 3 des Durchlaufofens. Typische Schutzgasmengen zum Betrieb eines solchen Ofens liegen im Bereich von etwa 100 bis 300 m³/h. Entsprechend der Erfindung muß nun ohne Verwendung der vorgeschalteten Kammern 4 eine ebensolche Menge an reinem Wasserstoff zugeführt werden. Sind entsprechend der Skizze vorgeschaltete Kammern angebracht, so kann die Wasserstoffschutzgaszufuhr um 20 bis 50 % verringert werden.The figure shows a continuous furnace for recrystallizing bright annealing of stainless steel strips. It is known to operate such continuous furnaces with ammonia cracked gas or with a corresponding supply gas mixture of nitrogen and hydrogen, which is supplied through the protective
Die Verwendung von Wasserstoff führt zu einer wesentlichen Verlängerung der Intervalle twischen zwei notwendigen Reinigungen der Kühlzone 3 und insbesondere der Wärmetauscher des Durchlaufofens. Die noch verbleibende Bildung von weißem Staub ist wahrscheinlich auf aus der Vorkammer in die Behandlungszone eindringenden Stickstoff und auf andere Stickstoffquellen - kleine Lecks - zurückzuführen. Das erfindungsgemäße Verfahren liefert aber trotzdem eine wesentliche Verbesserung der Wirtschaftlichkeit des Glühens in Durchlauföfen.The use of hydrogen leads to a substantial extension of the intervals between two necessary cleaning of the
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873733884 DE3733884A1 (en) | 1987-10-07 | 1987-10-07 | METHOD FOR GLOWING METAL PARTS IN CONTINUOUS OVENS |
| DE3733884 | 1987-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0311030A1 true EP0311030A1 (en) | 1989-04-12 |
Family
ID=6337799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88116437A Withdrawn EP0311030A1 (en) | 1987-10-07 | 1988-10-05 | Process for annealing metallic work pieces in a continuous furnace |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0311030A1 (en) |
| DE (1) | DE3733884A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4966632A (en) * | 1988-03-16 | 1990-10-30 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for the annealing treatment of metal strips |
| EP0714991A4 (en) * | 1994-06-07 | 1999-04-28 | Nisshin Steel Co Ltd | Sealing device for outlet/inlet of controlled atmosphere heat treatment furnace |
| FR2809418A1 (en) * | 2000-05-25 | 2001-11-30 | Stein Heurtey | METHOD FOR SECURING A HEAT TREATMENT ENCLOSURE OPERATING IN A CONTROLLED ATMOSPHERE |
| EP1408126A3 (en) * | 1998-03-26 | 2004-07-21 | JFE Steel Corporation | Continuous heat treatment furnace |
| EP1679385A4 (en) * | 2003-10-17 | 2007-05-30 | Chugai Ro Kogyo Kaisha Ltd | Method for controlling bright annealing furnace |
| WO2008000945A1 (en) * | 2006-06-30 | 2008-01-03 | Fives Stein | Device for securing a furnace provided with a rapid cooling and heating system operating under controlled atmosphere. |
| US11486030B2 (en) | 2018-05-23 | 2022-11-01 | Molecule Works Inc. | Process and apparatus for continuous production of porous structures |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4225982A1 (en) * | 1992-08-06 | 1994-02-10 | Linde Ag | Process for the continuous annealing of metallic material under a hydrogen-rich protective gas |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD31283A (en) * | ||||
| GB995883A (en) * | 1962-07-05 | 1965-06-23 | Davy & United Eng Co Ltd | Continuous heat treatment of metal strip |
| DD243717A5 (en) * | 1985-09-18 | 1987-03-11 | Baumeister,Klaus,Dd | METHOD FOR THE HEAT TREATMENT OF BAND OR WIRE WEAVING |
| US4696226A (en) * | 1986-08-28 | 1987-09-29 | Witmer Warner H | Fluid barrier curtain system |
| EP0075438B1 (en) * | 1981-09-19 | 1987-12-16 | BOC Limited | Heat treatment of metals |
-
1987
- 1987-10-07 DE DE19873733884 patent/DE3733884A1/en not_active Withdrawn
-
1988
- 1988-10-05 EP EP88116437A patent/EP0311030A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD31283A (en) * | ||||
| GB995883A (en) * | 1962-07-05 | 1965-06-23 | Davy & United Eng Co Ltd | Continuous heat treatment of metal strip |
| EP0075438B1 (en) * | 1981-09-19 | 1987-12-16 | BOC Limited | Heat treatment of metals |
| DD243717A5 (en) * | 1985-09-18 | 1987-03-11 | Baumeister,Klaus,Dd | METHOD FOR THE HEAT TREATMENT OF BAND OR WIRE WEAVING |
| US4696226A (en) * | 1986-08-28 | 1987-09-29 | Witmer Warner H | Fluid barrier curtain system |
Non-Patent Citations (2)
| Title |
|---|
| STAHL UND EISEN * |
| STEEL IN THE USSR * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4966632A (en) * | 1988-03-16 | 1990-10-30 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for the annealing treatment of metal strips |
| EP0714991A4 (en) * | 1994-06-07 | 1999-04-28 | Nisshin Steel Co Ltd | Sealing device for outlet/inlet of controlled atmosphere heat treatment furnace |
| EP1408126A3 (en) * | 1998-03-26 | 2004-07-21 | JFE Steel Corporation | Continuous heat treatment furnace |
| FR2809418A1 (en) * | 2000-05-25 | 2001-11-30 | Stein Heurtey | METHOD FOR SECURING A HEAT TREATMENT ENCLOSURE OPERATING IN A CONTROLLED ATMOSPHERE |
| EP1160342A1 (en) * | 2000-05-25 | 2001-12-05 | Stein Heurtey | Method for securing a controlled atmosphere heat treating chamber |
| EP1679385A4 (en) * | 2003-10-17 | 2007-05-30 | Chugai Ro Kogyo Kaisha Ltd | Method for controlling bright annealing furnace |
| WO2008000945A1 (en) * | 2006-06-30 | 2008-01-03 | Fives Stein | Device for securing a furnace provided with a rapid cooling and heating system operating under controlled atmosphere. |
| FR2903122A1 (en) * | 2006-06-30 | 2008-01-04 | Stein Heurtey | DEVICE FOR SECURING AN OVEN EQUIPPED WITH FAST HEATING AND COOLING OPERATING UNDER CONTROLLED ATMOSPHERE. |
| JP2009541598A (en) * | 2006-06-30 | 2009-11-26 | ファイブス シュタイン | Safety system for furnaces with rapid heating and cooling processes in a controlled atmosphere |
| EA012867B1 (en) * | 2006-06-30 | 2009-12-30 | Фив Стэн | Device for securing a furnace provided with a rapid cooling and heating system operating under controlled atmosphere |
| CN101466852B (en) * | 2006-06-30 | 2010-08-25 | 法孚斯坦因公司 | Safety device for furnaces operating under controlled atmosphere and equipped with rapid heating and cooling sections |
| US11486030B2 (en) | 2018-05-23 | 2022-11-01 | Molecule Works Inc. | Process and apparatus for continuous production of porous structures |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3733884A1 (en) | 1989-04-27 |
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