EP0106113A1 - Process and apparatus for the bright annealing of metallic parts using nitrogen as the protective atmosphere - Google Patents
Process and apparatus for the bright annealing of metallic parts using nitrogen as the protective atmosphere Download PDFInfo
- Publication number
- EP0106113A1 EP0106113A1 EP83108799A EP83108799A EP0106113A1 EP 0106113 A1 EP0106113 A1 EP 0106113A1 EP 83108799 A EP83108799 A EP 83108799A EP 83108799 A EP83108799 A EP 83108799A EP 0106113 A1 EP0106113 A1 EP 0106113A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nitrogen
- bright annealing
- cooling section
- liquid nitrogen
- 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.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 40
- 238000000137 annealing Methods 0.000 title claims abstract description 31
- 230000001681 protective effect Effects 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 13
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous 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
Definitions
- the invention relates to a method and a device for bright annealing metallic workpieces in a bright annealing furnace with a connected cooling section and nitrogen as a protective gas.
- the workpieces are annealed under protective gas in bright annealing furnaces for workpieces made of steel, iron or non-ferrous metals.
- Either exogas or nitrogen is used as the protective gas. If nitrogen is used, liquid nitrogen is evaporated in an air evaporator and, like the exogas, introduced at several points in the annealing furnace and the cooling section. The valuable cold of liquid nitrogen is lost unused.
- the invention has for its object to improve the bright annealing process with nitrogen as a protective gas in such a way that the system costs are reduced while simultaneously utilizing the cold content of the liquid nitrogen and an increase in performance and at least with some metals an improvement in quality becomes possible.
- the spray direction is preferably 15 ° to 20 ° deviating from the vertical and counter to the direction of movement of the annealing material. This results in an optimal heat exchange between the annealing material and liquid nitrogen, as well as excellent flow conditions for the evaporated nitrogen through the cooling section and the bright annealing furnace.
- the nitrogen consumption is the same.
- the liquid nitrogen is evaporated in the cooling section according to the invention, there is no need to set up an air evaporator.
- an increase in performance is possible due to the greater cooling of the workpieces and an improvement in quality, at least for some metals. Because of the strong cooling of the workpieces in the method according to the invention, they no longer start after leaving the cooling section, in contrast to methods according to the prior art.
- liquid nitrogen When using liquid nitrogen according to the invention, 152 kg / h of liquid nitrogen, which corresponds to 130 m 3 / h of gaseous nitrogen, were required.
- the outlet temperature of the copper pipes or copper coils was only 95 ° C, so that the workpieces no longer started.
- both the outlet temperature and the throughput can be varied in a simple manner. This is a particular advantage of the method according to the invention. If, on the other hand, one wanted to increase the throughput in the case of methods according to the prior art, the cooling section would have to be extended.
- a bright annealing furnace 1 is shown in section, at the entrance of which an inlet section 2 and at the exit of which a cooling section 3 are connected.
- the annealed material is conveyed on transport rollers 4 through the bright annealing furnace 1, the direction of movement of the annealed material is indicated by arrow 5.
- Nitrogen serves as protective gas, which is supplied in liquid form from the insulated tank 6 and through the insulated line 7 to the bright annealing furnace 1. According to the invention, the liquid nitrogen is sprayed directly into the end region 8 of the cooling section 3 without prior evaporation.
- the metering takes place by means of a regulating valve 9, and conventional conveying and monitoring devices, such as phase separators, thermometers and manometers, which are not shown in the drawing, are also provided.
- the sprayed-in liquid nitrogen evaporates by heat exchange with the still hot annealing material, flows in gaseous form through the cooling section 3 and the bright annealing furnace 1 and leaves the system through the inlet section 2.
- the direction of flow of the gaseous nitrogen is indicated by an arrow 10.
- FIGS. 2 and 3 A preferred device for spraying the liquid nitrogen into the cooling section 3 is shown in FIGS. 2 and 3.
- the nozzle assembly 12 is arranged in the ceiling 11, to which the liquid nitrogen is supplied through the control valve 9.
- the nozzle assembly 12 there are bores which are arranged so that the liquid nitrogen deviates from the vertical at an angle of 15 ° opposite to the movement Direction of the annealing material 13 emerges, as shown in Figure 3.
- the sprayed liquid nitrogen thus impinges almost perpendicularly on the annealing material 13, which causes an intensive heat exchange and rapid evaporation of the nitrogen.
- a movement toward the annealing furnace 1 and the inlet section 2 is impressed on the nitrogen.
- the invention is not limited to this device.
- the exit angle of 15 ° can e.g. can also be achieved in that the inlet pipe for the liquid nitrogen in the cooling section 3 is angled accordingly.
- Several nozzle assemblies can also be arranged one behind the other.
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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)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Blankglühen von metallischen Werkstücken in einem Blankglühofen mit angeschlossener Kühlstrecke und Stickstoff als Schutzgas.The invention relates to a method and a device for bright annealing metallic workpieces in a bright annealing furnace with a connected cooling section and nitrogen as a protective gas.
In Blankglühöfen für Werkstücke aus Stahl, Eisen oder NE-Metallen werden die Werkstücke unter Schutzgas geglüht. Als Schutzgas verwendet man hierfür entweder Exogas oder Stickstoff. Im Falle der Stickstoffverwendung wird flüssiger Stickstoff in einem Luftverdampfer verdampft und ähnlich wie das Exogas an mehreren Stellen des Glühofens und der Kühlstrecke eingeleitet. Hierbei geht die wertvolle Kälte des flüssigen Stickstoffes ungenutzt verloren.The workpieces are annealed under protective gas in bright annealing furnaces for workpieces made of steel, iron or non-ferrous metals. Either exogas or nitrogen is used as the protective gas. If nitrogen is used, liquid nitrogen is evaporated in an air evaporator and, like the exogas, introduced at several points in the annealing furnace and the cooling section. The valuable cold of liquid nitrogen is lost unused.
Der Erfindung liegt die Aufgabe zugrunde, das Blankglühverfahren mit Stickstoff als Schutzgas so zu verbessern, daß bei gleichzeitiger Ausnutzung des Kälteinhaltes des flüssigen Stickstoffes die Anlagekosten verringert und eine Leistungssteigerung und zumindest bei einigen Metallen eine Qualitätsverbesserung möglich wird.The invention has for its object to improve the bright annealing process with nitrogen as a protective gas in such a way that the system costs are reduced while simultaneously utilizing the cold content of the liquid nitrogen and an increase in performance and at least with some metals an improvement in quality becomes possible.
Bei einem Verfahren zum Blankglühen von metallischen Werkstücken in einem Blankglühofen mit angeschlossener Kühlstrecke und Stickstoff als Schutzgas wird dies gemäß der Erfindung erreicht, indem der Stickstoff in flüssiger Form im Endbereich der Kühlstrecke auf das Glühgut gesprüht wird.In a method for bright annealing of metallic workpieces in a bright annealing furnace with a connected cooling section and nitrogen as a protective gas, this is achieved according to the invention by spraying the nitrogen in liquid form on the annealing material in the end region of the cooling section.
Die Sprührichtung beträgt vorzugsweise 15° bis 20° abweichend von der Vertikalen und entgegen der Bewegungsrichtung des Glühgutes. Hierbei ergibt sich ein optimaler Wärmeaustausch zwischen Glühgut und flüssigem Stickstoff, sowie ausgezeichnete Strömungsverhältnisse für den verdampften Stickstoff durch die Kühlstrecke und den Blankglühofen.The spray direction is preferably 15 ° to 20 ° deviating from the vertical and counter to the direction of movement of the annealing material. This results in an optimal heat exchange between the annealing material and liquid nitrogen, as well as excellent flow conditions for the evaporated nitrogen through the cooling section and the bright annealing furnace.
Gegenüber dem bisherigen Verfahren, bei dem der flüssige Stickstoff in einem Luftverdampfer verdampft wird, ist der Stickstoffverbrauch gleich. Da aber erfindungsgemäß der flüssige Stickstoff in der Kühlstrecke verdampft wird, erübrigt sich das Aufstellen eines Luftverdampfers. Gegenüber dem Verfahren mit Exogas oder gasförmigem Stickstoff als Schutzgas ist wegen der stärkeren Abkühlung der Werkstücke eine Leistungssteigerung möglich und zumindest bei einigen Metallen eine Qualitätsverbesserung. Wegen der starken Abkühlung der Werkstücke bei dem erfindungsgemäßen Verfahren laufen diese nämlich nach Verlassen der Kühlstrecke nicht mehr an, im Gegensatz zu Verfahren nach dem Stand der Technik.Compared to the previous process, in which the liquid nitrogen is evaporated in an air evaporator, the nitrogen consumption is the same. However, since the liquid nitrogen is evaporated in the cooling section according to the invention, there is no need to set up an air evaporator. Compared to the process with exogas or gaseous nitrogen as a protective gas, an increase in performance is possible due to the greater cooling of the workpieces and an improvement in quality, at least for some metals. Because of the strong cooling of the workpieces in the method according to the invention, they no longer start after leaving the cooling section, in contrast to methods according to the prior art.
Dies zeigen die nachfolgend beschriebenen Vergleichsversuche.This is shown by the comparative tests described below.
Es wurden jeweils 2000 kg/h gestreckte Kupferrohre oder 1500 kg/h aufgewickelte Kupfercoils geglüht. Bei Verwendung von Exogas wurden hierfür 130 m/h benötigt. Die Auslauftemperatur der Kupferrohre bzw. der Kupfercoils aus der Kühlstrecke betrug 140° C. Die Kupfercoils und die Kupferrohre liefen an.In each case, 2000 kg / h stretched copper tubes or 1500 kg / h wound copper coils were annealed. When using Exogas, 130 m / h were required. The outlet temperature of the copper pipes or the copper coils from the cooling section was 140 ° C. The copper coils and the copper pipes started up.
Bei dem erfindungsgemäßen Einsatz von flüssigem Stickstoff wurden 152 kg/h flüssiger Stickstoff, das entspricht 130 m3/h gasförmigem Stickstoff,benötigt. Die Auslauftemperatur der Kupferrohre oder Kupfercoils betrug nur 95° C, so daß die Werkstücke nicht mehr anliefen.When using liquid nitrogen according to the invention, 152 kg / h of liquid nitrogen, which corresponds to 130 m 3 / h of gaseous nitrogen, were required. The outlet temperature of the copper pipes or copper coils was only 95 ° C, so that the workpieces no longer started.
Durch entsprechende Dosierung des flüssigen Stickstoffes kann sowohl die Auslaustemperatur als auch die Durchsatzmenge in einfacher Weise variiert werden. Dies ist ein besonderer Vorteil des erfindungsgemäßen Verfahrens. Wollte man dagegen bei Verfahren nach dem Stand der Technik die Durchsatzleistung steigern, so müßte die Kühlstrecke verlängert werden.By appropriately metering the liquid nitrogen, both the outlet temperature and the throughput can be varied in a simple manner. This is a particular advantage of the method according to the invention. If, on the other hand, one wanted to increase the throughput in the case of methods according to the prior art, the cooling section would have to be extended.
Ein Ausführungsbeispiel der Erfindung soll anhand der beigefügten Zeichnungen erläutert werden.An embodiment of the invention will be explained with reference to the accompanying drawings.
Es zeigen
- Fig.1 einen Schnitt durch einen Blankglühofen mit angeschlossener Kühlstrecke und Zufuhr von flüssigem Stickstoff in den Endbereich der Kühlstrecke,
- Fig.2 einen Schnitt entlang der Linie A-A in Fig.1,
- Fig.3 einen Schnitt entlang der Linie B-B in Fig.2.
- 1 shows a section through a bright annealing furnace with a connected cooling section and supply of liquid nitrogen into the end region of the cooling section,
- 2 shows a section along the line AA in FIG. 1,
- 3 shows a section along the line BB in Fig.2.
In Fig.1 ist im Schnitt einBlankglühofen 1 dargestellt, an dessen Eingang eine Einlaufstrecke 2 und an dessen Ausgang eine Kühlstrecke 3 angeschlossen sind. Das Glühgut wird auf Transportrollen 4 durch den Blankglühofen 1 gefördert, die Bewegungsrichtung des Glühgutes ist durch den Pfeil 5 angegeben. Als Schutzgas dient Stickstoff, der in flüssiger Form aus dem isolierten Tank 6 und durch die isolierte Leitung 7 dem Blankglühofen 1 zugeführt wird. Erfindungsgemäß wird der flüssige Stickstoff ohne vorherige Verdampfung direkt in den Endbereich 8 der Kühlstrecke 3 eingesprüht. Die Dosierung geschieht mittels eines Regulierventils 9, außerdem sind in der Zeichnung nicht dargestellte übliche Förder- und Überwachungseinrichtungen, wie Phasentrenner, Thermometer und Manometer, vorgesehen. Der eingesprühte flüssige Stickstoff verdampft durch Wärmeaustausch mit dem noch heißen Glühgut, strömt in gasförmiger Form durch die Kühlstrecke 3 und den Blankglühofen 1 und verläßt die Anlage durch die Einlaufstrecke 2. Die Strömungsrichtung des gasförmigen Stickstoffs ist durch einen Pfeil 10 angegeben.In Fig. 1, a bright annealing furnace 1 is shown in section, at the entrance of which an
Eine bevorzugte Vorrichtung zum Einsprühen des flüssigen Stickstoffes in die Kühlstrecke 3 ist in den Fig.2 und 3 dargestellt. Im Endbereich 8 der Kühlstrecke 3 ist in der Decke 11 der Düsenstock 12 angeordnet, dem durch das Regelventil 9 der flüssige Stickstoff zugeführt wird. In dem Düsenstock 12 befinden sich Bohrungen, die so angeordnet sind, daß der flüssige Stickstoff unter einem Winkel von 15° abweichend von der Vertikale entgegen der Bewegungsrichtung des Glühgutes 13 austritt, wie es in Fig.3 dargestellt ist. Der ausgesprühte flüssige Stickstoff prallt somit nahezu senkrecht auf das Glühgut 13 auf, was einen intensiven Wärmeaustausch und rasche Verdampfung des Stickstoffs bewirkt. Gleichzeitig wird dem Stickstoff jedoch eine Bewegung hin zum Glühofen 1 und zur Einlaufstrecke 2 aufgeprägt.A preferred device for spraying the liquid nitrogen into the cooling section 3 is shown in FIGS. 2 and 3. In the
Die Erfindung ist nicht auf diese Vorrichtung beschränkt. Der Austrittswinkel von 15° kann z.B. auch dadurch erreicht werden, daß das Eintrittsrohr für den flüssigen Stickstoff in der Kühlstrecke 3 entsprechend abgewinkelt wird. Es können auch mehrere Düsenstöcke hintereinander angeordnet werden.The invention is not limited to this device. The exit angle of 15 ° can e.g. can also be achieved in that the inlet pipe for the liquid nitrogen in the cooling section 3 is angled accordingly. Several nozzle assemblies can also be arranged one behind the other.
Claims (4)
dadurch gekennzeichnet,
daß der Stickstoff in flüssiger Form im Endbereich (8) der Kühlstrecke auf das Glühgut gesprüht wird.1. Method for bright annealing of metallic workpieces in a bright annealing furnace (1) with connected cooling section (3) and nitrogen as protective gas,
characterized,
that the nitrogen in liquid form is sprayed onto the annealing material in the end region (8) of the cooling section.
dadurch gekennzeichnet,
daß der Stickstoff unter einem Winkel von 15° bis 20° abweichend von der Vertikalen entgegen der Bewegungsrichtung (5) des Glühgutes (13) eingesprüht wird.2. The method according to claim 1,
characterized,
that the nitrogen is sprayed at an angle of 15 ° to 20 ° deviating from the vertical against the direction of movement (5) of the annealing material (13).
mit einem Blankglühofen und einer angeschlossenen Kühlstrecke, gekennzeichnet durch einen im Endbereich (8) der Kühlstrecke (3) unter dessen Decke (11) quer zur Bewegungsrichtung (5) des Glühgutes (13) angeordneten Düsenstock (12) mit Düsen zum Aufsprühen von flüssigem Stickstoff auf das Glühgut.3. Device for performing the method according to claim 1,
with a bright annealing furnace and a connected cooling section, characterized by a nozzle assembly (12) with nozzles for spraying liquid nitrogen in the end region (8) of the cooling section (3) under its cover (11) transversely to the direction of movement (5) of the annealing material (13) on the annealing material.
dadurch gekennzeichnet,
daß die Düsen unter einem Winkel von 15° bis 20° abweichend von der Vertikalen entgegen der Bewegungsrichtung des Glühgutes angeordnet sind.4. The device according to claim 3,
characterized,
that the nozzles are arranged at an angle of 15 ° to 20 ° deviating from the vertical against the direction of movement of the annealing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83108799T ATE23197T1 (en) | 1982-09-21 | 1983-09-07 | METHOD AND DEVICE FOR BRIGHT ANNEALING OF METALLIC WORKPIECES USING NITROGEN AS A PROTECTIVE GAS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3234863 | 1982-09-21 | ||
| DE3234863A DE3234863C2 (en) | 1982-09-21 | 1982-09-21 | Process and device for bright annealing of metallic workpieces with nitrogen as protective gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0106113A1 true EP0106113A1 (en) | 1984-04-25 |
| EP0106113B1 EP0106113B1 (en) | 1986-10-29 |
Family
ID=6173723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83108799A Expired EP0106113B1 (en) | 1982-09-21 | 1983-09-07 | Process and apparatus for the bright annealing of metallic parts using nitrogen as the protective atmosphere |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4515645A (en) |
| EP (1) | EP0106113B1 (en) |
| AT (1) | ATE23197T1 (en) |
| DE (1) | DE3234863C2 (en) |
| ZA (1) | ZA836972B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0189759A1 (en) * | 1985-01-17 | 1986-08-06 | Linde Aktiengesellschaft | Method and apparatus for heat treating work pieces |
| EP2227570B1 (en) | 2007-11-29 | 2017-01-25 | Benteler Automobiltechnik GmbH | Method for producing a shaped component comprising at least two joining areas having different ductility |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4643401A (en) * | 1985-08-28 | 1987-02-17 | Mg Industries | Apparatus for cooling a vacuum furnace |
| JPH01287221A (en) * | 1988-05-13 | 1989-11-17 | Usui Internatl Ind Co Ltd | Method and device for high-frequency heat treatment of long-sized metallic material |
| DE4234285A1 (en) * | 1992-10-10 | 1994-04-14 | Heimsoth Verwaltungen | Process for the heat treatment of metallic goods |
| DE19652607A1 (en) * | 1996-12-18 | 1998-06-25 | Messer Griesheim Gmbh | Process for glue-free annealing of non-ferrous metal parts |
| EP0949348A1 (en) * | 1998-04-09 | 1999-10-13 | Alusuisse Technology & Management AG | Process for controlled cooling of aluminium alloy strips and profiles |
| US6228187B1 (en) | 1998-08-19 | 2001-05-08 | Air Liquide America Corp. | Apparatus and methods for generating an artificial atmosphere for the heat treating of materials |
| DE10054765A1 (en) * | 2000-11-04 | 2002-05-16 | Messer Griesheim Gmbh | Heat treatment furnace used for heat treating steel comprises a housing containing a heating chamber with a treatment chamber having a deep cooling system |
| DE102004054627A1 (en) * | 2004-11-11 | 2006-05-18 | Linde Ag | Device for cooling long objects |
| US20060266793A1 (en) * | 2005-05-24 | 2006-11-30 | Caterpillar Inc. | Purging system having workpiece movement device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE671046C (en) * | 1934-08-30 | 1939-01-30 | Aeg | Process for the cooling of metallic goods heated in electrically heated bright annealing continuous furnaces |
| FR845086A (en) * | 1938-02-18 | 1939-08-10 | Method and device for the heat treatment of metallic objects | |
| DE2652943A1 (en) * | 1975-12-05 | 1977-06-16 | Fagersta Ab | PROCESS AND SYSTEM FOR THE PRODUCTION OF FLAT, HORIZONTAL LYING STEEL BLOCKS WITH LARGER WIDTH THAN HEIGHT |
| FR2379607A1 (en) * | 1977-02-03 | 1978-09-01 | Vide & Traitement Sa | Thermal or thermochemical treatment process of metals - involves a cooling step using a jet of liquid nitrogen |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3036825A (en) * | 1957-05-17 | 1962-05-29 | Eisenmenger Friedrich | Process and apparatus for the continuous heat treating of elongated material |
| US3189490A (en) * | 1962-11-05 | 1965-06-15 | United States Steel Corp | Method and apparatus for quenching pipe |
| US3407099A (en) * | 1965-10-22 | 1968-10-22 | United States Steel Corp | Method and apparatus for spraying liquids on the surface of cylindrical articles |
| US3507712A (en) * | 1967-09-08 | 1970-04-21 | United States Steel Corp | Method and apparatus for quenching pipe |
-
1982
- 1982-09-21 DE DE3234863A patent/DE3234863C2/en not_active Expired
-
1983
- 1983-09-07 EP EP83108799A patent/EP0106113B1/en not_active Expired
- 1983-09-07 AT AT83108799T patent/ATE23197T1/en not_active IP Right Cessation
- 1983-09-09 US US06/530,748 patent/US4515645A/en not_active Expired - Lifetime
- 1983-09-20 ZA ZA836972A patent/ZA836972B/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE671046C (en) * | 1934-08-30 | 1939-01-30 | Aeg | Process for the cooling of metallic goods heated in electrically heated bright annealing continuous furnaces |
| FR845086A (en) * | 1938-02-18 | 1939-08-10 | Method and device for the heat treatment of metallic objects | |
| DE2652943A1 (en) * | 1975-12-05 | 1977-06-16 | Fagersta Ab | PROCESS AND SYSTEM FOR THE PRODUCTION OF FLAT, HORIZONTAL LYING STEEL BLOCKS WITH LARGER WIDTH THAN HEIGHT |
| FR2379607A1 (en) * | 1977-02-03 | 1978-09-01 | Vide & Traitement Sa | Thermal or thermochemical treatment process of metals - involves a cooling step using a jet of liquid nitrogen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0189759A1 (en) * | 1985-01-17 | 1986-08-06 | Linde Aktiengesellschaft | Method and apparatus for heat treating work pieces |
| EP2227570B1 (en) | 2007-11-29 | 2017-01-25 | Benteler Automobiltechnik GmbH | Method for producing a shaped component comprising at least two joining areas having different ductility |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE23197T1 (en) | 1986-11-15 |
| US4515645A (en) | 1985-05-07 |
| EP0106113B1 (en) | 1986-10-29 |
| ZA836972B (en) | 1984-05-30 |
| DE3234863C2 (en) | 1986-04-10 |
| DE3234863A1 (en) | 1984-03-22 |
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