EP0992590A1 - Process for bright annealing metals having high oxygen affinity - Google Patents
Process for bright annealing metals having high oxygen affinity Download PDFInfo
- Publication number
- EP0992590A1 EP0992590A1 EP99890293A EP99890293A EP0992590A1 EP 0992590 A1 EP0992590 A1 EP 0992590A1 EP 99890293 A EP99890293 A EP 99890293A EP 99890293 A EP99890293 A EP 99890293A EP 0992590 A1 EP0992590 A1 EP 0992590A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- oxygen
- bright annealing
- metals
- protective gas
- 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- Withdrawn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
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
-
- 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 bright annealing with a high affinity for Metals containing oxygen in a hood furnace or the like under protective gas.
- a hood furnace with an encapsulated base construction it can can be annealed under the deepest dew points, but still can visible, annoying oxidation residues on the metal surface of the annealing material remain.
- the pure, highly reducing hydrogen allows the Oxides of the incandescent vessel, for example the heat-resistant steel construction of the base, the protective hood, the base fan and the distribution apparatus as well as existing scale reduced attacked and the resulting Moisture is transported to the annealing material.
- the annealing material for example in foils or by covering with steel caps, the is free of highly oxygen-affine elements, a residual discoloration of the Also do not completely suppress annealing goods.
- Lubricant residues are located on the surface of the annealing material, which mainly consist of Water and oil, i.e. an emulsion, exist and during the heating process evaporate and react with the surface of the annealing material. This allows you to Do not avoid discolouration when adding a large amount of protective gas.
- the invention is therefore based on the object of a method of the beginning Specify the type described, with the surface defects of the annealing material practical be avoided.
- the invention solves the problem in that as a protective gas as possible pure noble gas, such as argon, neon or helium in cooperation with an oxygen binder, preferably titanium, is used.
- a protective gas as possible pure noble gas, such as argon, neon or helium in cooperation with an oxygen binder, preferably titanium, is used.
- metals with residual lubricants are to be bright annealed, first the lubricant is evaporated under a protective gas made of noble or Inert gas, e.g. B. nitrogen, and / or a reducing gas, e.g. B. hydrogen, exists, and then for the subsequent bright annealing as a protective gas, if possible pure noble gas, with a maximum of 50 vol.% of a reducing gas is mixed, preferably in cooperation with an oxygen binder Titanium.
- a protective gas made of noble or Inert gas, e.g. B. nitrogen, and / or a reducing gas, e.g. B. hydrogen
- the evaporation process of the residual lubricant adhering to the surface can be under a different shielding gas or shielding gas mixture than bright annealing be carried out because the evaporation takes place in a lower temperature range takes place and therefore no annoying surface discoloration are expected.
- the heat treatment is then carried out Replacement of the protective gas continued.
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 Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Furnace Details (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Blankglühen von eine hohe Affinität zu Sauerstoff aufweisenden Metallen in einem Haubenofen od. dgl. unter Schutzgas.The invention relates to a method for bright annealing with a high affinity for Metals containing oxygen in a hood furnace or the like under protective gas.
Mittel- bis hochlegierte Stähle, Buntmetalle und allgemein schwierig blankzuglühende Metalle, die Komponenten mit hoher Affinität zu Sauerstoff, z. B. Chrom, Mangan, Silizium, Titan usw., aufweisen, werden bisher, um deren Struktur einzuformen oder nach Verformungsschritten deren Gefüge zu rekristallisieren, wärmebehandelt. Dies geschieht normalerweise in Haubenöfen mit nicht gekapseltem Sockelaufbau, wobei als Schutzgas Wasserstoff oder ein Gemisch aus Wasserstoff und Stickstoff verwendet wird. Durch den Kontakt mit der Sockelisolation im Ofen werden aber Sauerstoffreste aus dieser durch den Wasserstoff zur zu behandelnden Charge, z. B. Bandbunden, transportiert. Der durch die Reaktion entstehende Wasserdampf oxidiert dann die Glühgutoberfläche, wobei ein weiterer Mangel dadurch entsteht, daß Sauerstoffreste im Schutzgas mit der Glühgutoberfläche reagieren.Medium to high-alloy steels, non-ferrous metals and generally difficult to bright anneal Metals, the components with high affinity for oxygen, e.g. B. chrome, Manganese, silicon, titanium, etc. have so far been used to determine their structure to form or to recrystallize their structure after deformation steps, heat treated. This usually happens in bell-type furnaces with non-encapsulated Base structure, using hydrogen or a mixture as protective gas from hydrogen and nitrogen is used. Through contact with the Base insulation in the furnace but oxygen residues from this through the Hydrogen to the batch to be treated, e.g. B. bundles transported. The The steam generated by the reaction then oxidizes the surface of the annealing material, a further deficiency arises from the fact that oxygen residues in the React protective gas with the surface of the annealing material.
Wird ein Haubenofen mit gekapselter Sockelkonstruktion verwendet, so kann unter tiefsten Taupunkten geglüht werden, dabei können aber immer noch sichtbare, störende Oxidationsreste an der Metalloberfläche des Glühgutes verbleiben.If a hood furnace with an encapsulated base construction is used, it can can be annealed under the deepest dew points, but still can visible, annoying oxidation residues on the metal surface of the annealing material remain.
Schließlich können durch den reinen, höchst reduzierfreudigen Wasserstoff die Oxide des Glühgefäßes, also beispielsweise der hitzebeständigen Stahlkonstruktion des Sockels, der Schutzhaube, des Sockelventilators und des Verteilapparates sowie vorhandener Zunder reduzierend angegriffen und die entstehende Feuchtigkeit zum Glühgut transportiert werden. Durch das Einpacken des Glühgutes beispielsweise in Folien oder durch Abdecken mit Kappen aus Stahl, der frei von hochsauerstoff-affinen Elementen ist, läßt sich eine Restverfärbung des Glühgutes auch nicht vollständig zurückdrängen.After all, the pure, highly reducing hydrogen allows the Oxides of the incandescent vessel, for example the heat-resistant steel construction of the base, the protective hood, the base fan and the distribution apparatus as well as existing scale reduced attacked and the resulting Moisture is transported to the annealing material. By packing the annealing material for example in foils or by covering with steel caps, the is free of highly oxygen-affine elements, a residual discoloration of the Also do not completely suppress annealing goods.
Außerdem können sich von den vorangegangenen Verformungsvorgängen noch Schmiermittelreste auf der Glühgutoberfläche befinden, die vorwiegend aus Wasser und Öl, also einer Emulsion bestehen und während der Erwärmung abdampfen und mit der Glühgutoberfläche reagieren. Dadurch lassen sich selbst bei hoher Schutzgaszugabe Restverfärbungen nicht vermeiden.It can also differ from the previous deformation processes Lubricant residues are located on the surface of the annealing material, which mainly consist of Water and oil, i.e. an emulsion, exist and during the heating process evaporate and react with the surface of the annealing material. This allows you to Do not avoid discolouration when adding a large amount of protective gas.
Somit liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der eingangs geschilderten Art anzugeben, bei dem Oberflächenmängel des Glühgutes praktisch vermieden werden.The invention is therefore based on the object of a method of the beginning Specify the type described, with the surface defects of the annealing material practical be avoided.
Die Erfindung löst die gestellte Aufgabe dadurch, daß als Schutzgas ein möglichst reines Edelgas, wie Argon, Neon oder Helium im Zusammenwirken mit einem Sauerstoffbinder, vorzugsweise Titan, verwendet wird.The invention solves the problem in that as a protective gas as possible pure noble gas, such as argon, neon or helium in cooperation with an oxygen binder, preferably titanium, is used.
Durch die Verwendung eines solchen Schutzgases zusammen mit einem im Inneren des Glühgefäßes vorgesehenen Sauerstoffbinders werden eine Oxidation bzw. eine Verfärbung des Glühgutes mit sich bringende Reaktionen von - Sauerstoffträgern, wie CO, CO2, H2O, oder von Sauerstoff unterbunden. Außerdem wird der Transport von Sauerstoff und Sauerstoffträgern vom hitzebeständigen Material des Glühgefäßes zum Glühgut überhaupt verhindert.The use of such a protective gas together with an oxygen binder provided in the interior of the annealing vessel prevents oxidation or discoloration of the annealing material with reactions of oxygen carriers, such as CO, CO 2 , H 2 O, or of oxygen. In addition, the transport of oxygen and oxygen carriers from the heat-resistant material of the annealing vessel to the annealing material is prevented at all.
Der Einsatz von Stickstoff als Inertgas ist dabei nur bedingt möglich, da eine unerwünschte Nitrid-Bildung an der Oberfläche des Glühgutes bei verschiedenen Metallen erfolgen könnte.The use of nitrogen as an inert gas is only possible to a limited extent since this is an undesirable one Nitride formation on the surface of the annealing material in various Metals could be made.
Sollen mit Restschmiermitteln behaftete Metalle blankgeglüht werden, wird zuerst das Schmiermittel unter einem Schutzgas abgedampft, das aus Edel- oder Inertgas, z. B. Stickstoff, und/oder einem reduzierenden Gas, z. B. Wasserstoff, besteht, und dann zum anschließenden Blankglühen als Schutzgas das möglichst reine Edelgas, das mit höchstens 50 Vol. % eines reduzierenden Gases vermischt ist, im Zusammenwirken mit einem Sauerstoffbinder, vorzugsweise Titan, verwendet.If metals with residual lubricants are to be bright annealed, first the lubricant is evaporated under a protective gas made of noble or Inert gas, e.g. B. nitrogen, and / or a reducing gas, e.g. B. hydrogen, exists, and then for the subsequent bright annealing as a protective gas, if possible pure noble gas, with a maximum of 50 vol.% of a reducing gas is mixed, preferably in cooperation with an oxygen binder Titanium.
Der Abdampfprozeß des an der Oberfläche anhaftenden Restschmiermittels kann unter einem anderen Schutzgas oder Schutzgasgemisch als das Blankglühen durchgeführt werden, da das Abdampfen in einem niederen Temperaturbereich stattfindet und somit keine störenden Oberflächenverfärbungen zu erwarten sind. Nach dem Abdampfen wird dann die Wärmebehandlung durch Tausch des Schutzgases fortgesetzt.The evaporation process of the residual lubricant adhering to the surface can be under a different shielding gas or shielding gas mixture than bright annealing be carried out because the evaporation takes place in a lower temperature range takes place and therefore no annoying surface discoloration are expected. After evaporation, the heat treatment is then carried out Replacement of the protective gas continued.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0166298A AT407262B (en) | 1998-10-05 | 1998-10-05 | METHOD FOR BLANKING FROM A HIGH AFFINITY TO METALS HAVING OXYGEN |
| AT166298 | 1998-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0992590A1 true EP0992590A1 (en) | 2000-04-12 |
Family
ID=3518277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99890293A Withdrawn EP0992590A1 (en) | 1998-10-05 | 1999-09-14 | Process for bright annealing metals having high oxygen affinity |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6210499B1 (en) |
| EP (1) | EP0992590A1 (en) |
| JP (1) | JP2000109934A (en) |
| KR (1) | KR20000028808A (en) |
| AT (1) | AT407262B (en) |
| TW (1) | TW533245B (en) |
| ZA (1) | ZA996180B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608983B (en) * | 2009-07-23 | 2011-05-18 | 攀钢集团钢铁钒钛股份有限公司 | Preparation method of chemical analysis sample of titanium product and titanium alloy and preparation device thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116377355A (en) * | 2023-01-30 | 2023-07-04 | 安徽赛丽金属科技有限公司 | Copper wire annealing and tempering equipment |
| CN117187499A (en) * | 2023-10-24 | 2023-12-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Bright annealing process method of argon annealing furnace |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5292813A (en) * | 1976-01-30 | 1977-08-04 | Niigata Engineering Co Ltd | Heat treatment of titanium and titanium alloy |
| JPS5989725A (en) * | 1982-11-15 | 1984-05-24 | Nippon Steel Corp | Protective coating material for annealing for anisotropic silicon steel plate |
| JPS6311616A (en) * | 1986-06-30 | 1988-01-19 | Mitsubishi Heavy Ind Ltd | Method for preventing discoloration in heat treatment of steel |
| US4744837A (en) * | 1987-01-13 | 1988-05-17 | Air Products And Chemicals, Inc. | Bright annealing of stainless steels |
| DE3931195A1 (en) * | 1988-09-26 | 1990-03-29 | Bandstahlkombinat Matern Veb | Bright annealing of steel strip coils - by adjusting inert gas flow rate to correspond to emulsion evaporation |
| FR2653448A1 (en) * | 1989-10-20 | 1991-04-26 | Air Liquide | Process for the production of an atmosphere for metal treatment |
| DE4336771A1 (en) * | 1993-10-28 | 1995-05-04 | Loi Ind Ofenanlagen | Process for annealing annealing material and associated annealing furnace |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2921593C2 (en) * | 1979-05-28 | 1984-02-02 | Gränges Nyby AB, Nybybruk | Method and device for further comminution of hydrogenated, coarse material, especially scrap made of titanium or its alloys |
| US4813654A (en) * | 1987-11-09 | 1989-03-21 | Lee Wilson Engineering Company, Inc. | Annealing furnace base construction |
| DE4121277C2 (en) * | 1991-06-27 | 2000-08-03 | Ald Vacuum Techn Ag | Device and method for the automatic monitoring of operational safety and for controlling the process sequence in a vacuum heat treatment furnace |
| US5284526A (en) * | 1992-12-22 | 1994-02-08 | Air Products And Chemicals, Inc. | Integrated process for producing atmospheres suitable for heat treating from non-cryogenically generated nitrogen |
| US5441581A (en) * | 1994-06-06 | 1995-08-15 | Praxair Technology, Inc. | Process and apparatus for producing heat treatment atmospheres |
| JP2726242B2 (en) * | 1994-06-07 | 1998-03-11 | 日新製鋼株式会社 | Sealing device at the entrance or exit of atmosphere equipment |
| US5772428A (en) * | 1996-02-09 | 1998-06-30 | Praxair Technology, Inc. | Method and apparatus for heat treatment including H2 /H2 O furnace region control |
-
1998
- 1998-10-05 AT AT0166298A patent/AT407262B/en not_active IP Right Cessation
-
1999
- 1999-09-14 EP EP99890293A patent/EP0992590A1/en not_active Withdrawn
- 1999-09-28 ZA ZA9906180A patent/ZA996180B/en unknown
- 1999-09-30 TW TW088116817A patent/TW533245B/en not_active IP Right Cessation
- 1999-10-01 US US09/410,622 patent/US6210499B1/en not_active Expired - Fee Related
- 1999-10-04 KR KR1019990042559A patent/KR20000028808A/en not_active Abandoned
- 1999-10-05 JP JP11284411A patent/JP2000109934A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5292813A (en) * | 1976-01-30 | 1977-08-04 | Niigata Engineering Co Ltd | Heat treatment of titanium and titanium alloy |
| JPS5989725A (en) * | 1982-11-15 | 1984-05-24 | Nippon Steel Corp | Protective coating material for annealing for anisotropic silicon steel plate |
| JPS6311616A (en) * | 1986-06-30 | 1988-01-19 | Mitsubishi Heavy Ind Ltd | Method for preventing discoloration in heat treatment of steel |
| US4744837A (en) * | 1987-01-13 | 1988-05-17 | Air Products And Chemicals, Inc. | Bright annealing of stainless steels |
| DE3931195A1 (en) * | 1988-09-26 | 1990-03-29 | Bandstahlkombinat Matern Veb | Bright annealing of steel strip coils - by adjusting inert gas flow rate to correspond to emulsion evaporation |
| FR2653448A1 (en) * | 1989-10-20 | 1991-04-26 | Air Liquide | Process for the production of an atmosphere for metal treatment |
| DE4336771A1 (en) * | 1993-10-28 | 1995-05-04 | Loi Ind Ofenanlagen | Process for annealing annealing material and associated annealing furnace |
Non-Patent Citations (3)
| Title |
|---|
| DATABASE WPI Section Ch Week 197737, Derwent World Patents Index; Class M29, AN 1977-65814Y, XP002127938 * |
| PATENT ABSTRACTS OF JAPAN vol. 008, no. 199 (C - 242) 12 September 1984 (1984-09-12) * |
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 213 (C - 505) 17 June 1988 (1988-06-17) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608983B (en) * | 2009-07-23 | 2011-05-18 | 攀钢集团钢铁钒钛股份有限公司 | Preparation method of chemical analysis sample of titanium product and titanium alloy and preparation device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA166298A (en) | 2000-06-15 |
| AT407262B (en) | 2001-02-26 |
| JP2000109934A (en) | 2000-04-18 |
| TW533245B (en) | 2003-05-21 |
| ZA996180B (en) | 2000-04-10 |
| KR20000028808A (en) | 2000-05-25 |
| US6210499B1 (en) | 2001-04-03 |
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