EP1233078A2 - Verfahren zum Abschrecken von metallischen Werkstücken - Google Patents
Verfahren zum Abschrecken von metallischen Werkstücken Download PDFInfo
- Publication number
- EP1233078A2 EP1233078A2 EP02003818A EP02003818A EP1233078A2 EP 1233078 A2 EP1233078 A2 EP 1233078A2 EP 02003818 A EP02003818 A EP 02003818A EP 02003818 A EP02003818 A EP 02003818A EP 1233078 A2 EP1233078 A2 EP 1233078A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- quenching
- mixture
- gas
- hydrogen
- furnace chamber
- 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
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
-
- 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
- C21D2241/00—Treatments in a special environment
- C21D2241/01—Treatments in a special environment under pressure
Definitions
- the invention relates to a method for quenching metallic workpieces in an oven space, especially under superatmospheric pressure, where as Quenching gas (mixture) an inert gas or inert gas mixture, in particular nitrogen, Argon and / or helium can be used after the metallic workpiece is in was subjected to a heat treatment process in an evacuated furnace chamber.
- Quenching gas mixture
- an inert gas or inert gas mixture in particular nitrogen, Argon and / or helium
- Metals are very sensitive to oxygen at high temperatures, especially at temperatures above 700 ° C.
- Chromium for example, oxidizes at 1000 ° C with an oxygen partial pressure of approx. 10-23 bar.
- higher levels, for example of titanium result in an undesirable nitride formation, due to which hard cracks can occur.
- a large number of quenching processes result in a so-called forming gas, which consists of approx. There is 5% hydrogen and approx. 95% nitrogen.
- this Forming gas will have a low surface oxidation on those to be treated metallic material and also worked below the explosion limit.
- the object of the present invention is to provide a generic method for To quench metallic workpieces using tarnishing and Oxidation phenomena on the surfaces of the metallic workpieces are reduced or can be avoided.
- the nitrogen uptake and the mentioned nitride formation can be reduced.
- a generic method for quenching proposed by metallic workpieces which is characterized in that before introducing the quenching gas (mixture) into the furnace chamber Evacuated furnace space hydrogen is supplied, but the furnace space only so much hydrogen is supplied that, depending on the quenching pressure, the Gas temperature at the end of the quenching process and the composition of the Quenching gas (mixture) it, a hydrogen concentration in the Quench gas (mixture) below the explosion limit is reached.
- the hydrogen to be supplied depends on the quenching pressure Gas temperature at the end of the quenching process and the composition of the Quenching (mixture).
- the method according to the invention for quenching metallic workpieces are therefore operated so that the hydrogen concentration in the quenching gas (mixture) is a maximum of 5%.
- the method according to the invention for quenching metallic workpieces further education is proposed that before the addition of hydrogen in the evacuated furnace space the pressure prevailing in the furnace space is measured or is determined.
- This advantageous embodiment of the inventive method for The quenching of metallic workpieces serves to guarantee a oxygen-free furnace space, so that an undesirable and u. U. dangerous Mixing of oxygen and hydrogen can be prevented effectively.
- the hydrogen is advantageously added to the still evacuated ones Furnace space as quickly as possible or suddenly, which is why the hydrogen is preferably out a storage or buffer tank, preferably directly to the furnace chamber is connected, is relaxed in these.
- Such storage or buffer containers are usually with a defined pressure filled so that the introduction of hydrogen into the furnace space or the amount of hydrogen to be introduced into the furnace space is controllable.
- the furnace space is advantageously joined flushed with an inert gas (mixture); additionally or alternatively, flaring takes place of the quenching gas (mixture) emerging from the furnace chamber, so that this can be released into the atmosphere in a controlled manner.
- an inert gas mixture
- flaring takes place of the quenching gas (mixture) emerging from the furnace chamber, so that this can be released into the atmosphere in a controlled manner.
- the furnace chamber can then be relieved of pressure and be opened for the removal of the metallic workpiece (s).
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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Furnace Details (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
- Verringerung bzw. Vermeidung der Bildung von Anlauffarben und Oxidationserscheinungen an der Oberfläche der metallischen Werkstücke
- Verringerung der Stickstoffaufnahme sowie Nitridbildung aufgrund der mit der Zugabe des Wasserstoffes verbundenen geringfügigen Temperaturabsenkung
- Ausbildung von blankeren Oberflächen, so dass weniger Nacharbeiten anfallen
Claims (6)
- Verfahren zum Abschrecken von metallischen Werkstücken in einem Ofenraum, insbesondere unter überatmosphärischem Druck, wobei als Abschreckgas(gemisch) ein Inertgas oder Inertgasgemisch, insbesondere Stickstoff, Argon und/oder Helium verwendet werden, nachdem das metallische Werkstück in einem evakuierten Ofenraum einem Wärmebehandlungsprozess unterworfen wurde, dadurch gekennzeichnet, dass vor dem Einleiten des Abschreckgas(gemisch)es in den Ofenraum dem noch evakuierten Ofenraum Wasserstoff zugeführt wird, wobei dem Ofenraum jedoch nur soviel Wasserstoff zugeführt wird, dass, abhängig von dem Abschreckdruck, der Gastemperatur am Ende des Abschreckprozesses und der Zusammensetzung des Abschreckgas(gemisch)es, eine Wasserstoff-Konzentration in dem Abschreckgas(gemisch) unterhalb der Explosionsgrenze erreicht wird.
- Verfahren zum Abschrecken von metallischen Werkstücken nach Anspruch 1, dadurch gekennzeichnet, dass die Wasserstoff-Konzentration in dem Abschreckgas(gemisch) maximal 5 % beträgt.
- Verfahren zum Abschrecken von metallischen Werkstücken nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass vor der Zugabe des Wasserstoffes in den noch evakuierten Ofenraum der in dem Ofenraum herrschende Druck gemessen bzw. ermittelt wird.
- Verfahren zum Abschrecken von metallischen Werkstücken nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Zugabe des Wasserstoffes in den noch evakuierten Ofenraum schlagartig, vorzugsweise durch eine Entspannung aus einem Speicher- oder Pufferbehälter, erfolgt.
- Verfahren zum Abschrecken von metallischen Werkstücken nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Zugabe des Abschreckgas(gemisch)es in den Ofenraum ebenfalls schlagartig, vorzugsweise durch eine Entspannung aus einem Speicher- oder Pufferbehälter, erfolgt.
- Verfahren zum Abschrecken von metallischen Werkstücken nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass nach Beendigung des Abschreckprozesses der Ofenraum mit einem Inertgas(gemisch) gespült wird und/oder ein Abfackeln des aus dem Ofenraum austretenden Abschreckgas(gemisch)es erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10108057A DE10108057A1 (de) | 2001-02-20 | 2001-02-20 | Verfahren zum Abschrecken von metallischen Werkstücken |
DE10108057 | 2001-02-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1233078A2 true EP1233078A2 (de) | 2002-08-21 |
EP1233078A3 EP1233078A3 (de) | 2003-11-26 |
EP1233078B1 EP1233078B1 (de) | 2006-02-15 |
Family
ID=7674804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02003818A Expired - Lifetime EP1233078B1 (de) | 2001-02-20 | 2002-02-20 | Verfahren zum Abschrecken von metallischen Werkstücken |
Country Status (5)
Country | Link |
---|---|
US (1) | US6692593B2 (de) |
EP (1) | EP1233078B1 (de) |
AT (1) | ATE317918T1 (de) |
DE (2) | DE10108057A1 (de) |
ES (1) | ES2258572T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005045783A1 (de) * | 2005-09-23 | 2007-03-29 | Sistem Teknik Endustriyel Elektronik Sistemler Sanayi Ve Ticaret Ltd. Sirketi | Einkammer-Vakuumofen mit Wasserstoffabschreckung |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987003159A1 (en) * | 1985-11-12 | 1987-05-21 | Mg Industries, Inc. | Method and apparatus for cooling induction heated material |
US4867808A (en) * | 1987-10-28 | 1989-09-19 | Degussa Aktiengesellschaft | Heat treating a metallic workpiece by quenching under cooling gas under above atmospheric pressure and specified circulation rate |
EP0495151A1 (de) * | 1991-01-15 | 1992-07-22 | Linde Aktiengesellschaft | Verfahren zur Wärmebehandlung in Vakuumöfen |
US5362031A (en) * | 1991-06-27 | 1994-11-08 | Leybold Durfrrit Gmbh | Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven |
EP0869189A1 (de) * | 1997-03-11 | 1998-10-07 | Linde Aktiengesellschaft | Verfahren zur Gasabschreckung metallischer Werkstücke |
EP0962538A2 (de) * | 1998-06-02 | 1999-12-08 | Linde Aktiengesellschaft | Verfahren und Vorrichtung zur effektiven Abkühlung von Behandlungsgut |
EP1211329A2 (de) * | 2000-12-04 | 2002-06-05 | Praxair Technology, Inc. | Verfahren und Vorrichtung zum Hochdruckgasabschrecken in einem Schutzgasofen |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58147514A (ja) * | 1982-02-24 | 1983-09-02 | Ishikawajima Harima Heavy Ind Co Ltd | ガス冷却熱処理法 |
DE3819803C1 (de) * | 1988-06-10 | 1989-12-14 | Ulrich 5810 Witten De Wingens |
-
2001
- 2001-02-20 DE DE10108057A patent/DE10108057A1/de not_active Withdrawn
-
2002
- 2002-02-15 US US10/076,072 patent/US6692593B2/en not_active Expired - Fee Related
- 2002-02-20 ES ES02003818T patent/ES2258572T3/es not_active Expired - Lifetime
- 2002-02-20 EP EP02003818A patent/EP1233078B1/de not_active Expired - Lifetime
- 2002-02-20 AT AT02003818T patent/ATE317918T1/de not_active IP Right Cessation
- 2002-02-20 DE DE50205811T patent/DE50205811D1/de not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987003159A1 (en) * | 1985-11-12 | 1987-05-21 | Mg Industries, Inc. | Method and apparatus for cooling induction heated material |
US4867808A (en) * | 1987-10-28 | 1989-09-19 | Degussa Aktiengesellschaft | Heat treating a metallic workpiece by quenching under cooling gas under above atmospheric pressure and specified circulation rate |
US4867808B1 (de) * | 1987-10-28 | 1994-02-22 | Leybold Durferrit Gmbh | |
EP0495151A1 (de) * | 1991-01-15 | 1992-07-22 | Linde Aktiengesellschaft | Verfahren zur Wärmebehandlung in Vakuumöfen |
US5362031A (en) * | 1991-06-27 | 1994-11-08 | Leybold Durfrrit Gmbh | Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven |
EP0869189A1 (de) * | 1997-03-11 | 1998-10-07 | Linde Aktiengesellschaft | Verfahren zur Gasabschreckung metallischer Werkstücke |
EP0962538A2 (de) * | 1998-06-02 | 1999-12-08 | Linde Aktiengesellschaft | Verfahren und Vorrichtung zur effektiven Abkühlung von Behandlungsgut |
EP1211329A2 (de) * | 2000-12-04 | 2002-06-05 | Praxair Technology, Inc. | Verfahren und Vorrichtung zum Hochdruckgasabschrecken in einem Schutzgasofen |
Also Published As
Publication number | Publication date |
---|---|
US6692593B2 (en) | 2004-02-17 |
EP1233078A3 (de) | 2003-11-26 |
US20020121320A1 (en) | 2002-09-05 |
DE50205811D1 (de) | 2006-04-20 |
ATE317918T1 (de) | 2006-03-15 |
ES2258572T3 (es) | 2006-09-01 |
EP1233078B1 (de) | 2006-02-15 |
DE10108057A1 (de) | 2002-08-22 |
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