EP1424402A1 - Verfahren zum kleberfreien Glühen von Metallteilen - Google Patents
Verfahren zum kleberfreien Glühen von Metallteilen Download PDFInfo
- Publication number
- EP1424402A1 EP1424402A1 EP03027065A EP03027065A EP1424402A1 EP 1424402 A1 EP1424402 A1 EP 1424402A1 EP 03027065 A EP03027065 A EP 03027065A EP 03027065 A EP03027065 A EP 03027065A EP 1424402 A1 EP1424402 A1 EP 1424402A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydrogen
- annealing
- recorded
- water vapor
- chromium
- 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
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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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
Definitions
- the invention relates to a method for glue-free annealing of metal parts, especially of steel parts containing chrome and manganese, according to Features of the preamble of claim 1.
- Annealing steel parts containing chrome or manganese in one Treatment furnace is during the Heating phase on the surface of the annealing material a thin layer of chrome oxide (Cr2O3) and / or spinel layer (FeCr2O4).
- This top layer created by oxidation prevents during the Hold phase performed recrystallization annealing from local Diffusion welding, so-called glue, resulting gluing of the annealing parts on their contact surfaces and thus the quality of the Finished product reducing surface defects.
- the pure one usually used as a protective gas when annealing alloy steel Hydrogen with a dew point below minus 70 degrees Celsius only contains up to to 2 vpm (0.002 vol%) water in the form of water vapor.
- the water vapor-hydrogen content is so far during the glow the protective gas atmosphere using oxygen or lambda sensors or with continuously measuring dew point measuring devices.
- the optimal water vapor content for the respective glow phase Furnace atmosphere can be increased by adding oxygen-containing media, such as for example water, nitrous oxide, air, oxygen or carbon dioxide
- oxygen-containing media such as for example water, nitrous oxide, air, oxygen or carbon dioxide
- Additives that do not cause undesired reactions, e.g. an embroidery and Carburize in the annealing material can be adjusted.
- the invention is therefore based on the object of a method for adhesive-free Annealing metal parts, especially those containing chromium and manganese Steel parts, under a protective gas atmosphere containing hydrogen To provide that is reproducible and for the further processing of the Annealing leads not impairing oxide layers.
- the object of the invention is achieved by a method with the in claim 1 specified features solved.
- the actual signal is fed to a control unit and in this with a Control unit compared to the target signal formed from the stored target values.
- the Water vapor content in the hydrogen atmosphere by adding changed media containing oxygen until the actual signal corresponds to the target signal.
- oxygen-containing media i.a. Water, carbon dioxide, nitrous oxide, air or pure oxygen - i.e. Media that do not like undesirable reactions for example embroidering or carburizing in the annealing material, - in the Treatment room of the furnace can be introduced.
- To measure the water content in the furnace atmosphere find measuring devices such as for example, commercially available oxygen or lambda sensors or continuously measuring dew point meters use.
- the target signal is empirically determined as the target value, the respective one Process conditions optimally corresponding process parameters, for example the Process temperature and the composition of the annealing material.
- annealing metal parts in particular chromium and Steels containing manganese can be a clean, scale, temper and Quality products with decarburization-free annealing surface provided become.
- dew point corresponds to: -30 ° C, -40 ° C, - 50 ° C, -60 ° C.
- the dew point is a practical measure of water concentration and can therefore be used as a concentration.
- the temperatures and holding times adapted to the respective heat treatment cause the formation of different chromium oxide layer thicknesses on the Metal parts.
- the transparency of the surface of a metal part is with a chromium oxide layer thickness guaranteed up to about 0.030 microns. With a chromium oxide layer thickness The surface of the metal part changes color if it is larger than approx. 0.030 micrometer yellowish and with increasing chrome oxide layer thickness blue-violet-green and loses its transparency.
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 Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Es zeigen:
- Fig. 1
- eine Diagramm-Darstellung der Stabilität von Chromoxid in Abhängigkeit vom Sauerstoffpartialdruck der Wasserstoffatmosphäre und der Temperatur;
- Fig. 2
- eine Diagramm-Darstellung der Stabilität von Chromoxid in Abhängigkeit vom Sauerstoffpartialdruck der Wasserstoffatmosphäre und der Temperatur;
- Fig. 3
- eine Diagramm-Darstellung der Kinetik der Chromoxidbildung einer Fe-20%Cr-Legierung im Wasserstoff/Wasser-Gemisch in Abhängigkeit von der Temperatur und Zeit;
- Fig. 4
- eine Diagramm-Darstellung der Kinetik der Chromoxidschichtbildung einer Fe-20%Cr-Legierung im Wasserstoff/Wassergemisch in Abhängigkeit von der Temperatur und Zeit.
Claims (6)
- Verfahren zum kleberfreien Glühen von Metallteilen, insbesondere von Chrom und Mangan enthaltenden Stählen, in einer Wasserstoff-Wasserdampf-Atmosphäre mit den Phasen Aufheizen, Halten und Abkühlen, bei dem die auf der Oberfläche des Glühguts während der Aufheizphase gebildete, das Zusammenkleben der Glühgutteile verhindernde Oxidschicht während der Abkühlphase erhalten bleibt, dadurch gekennzeichnet, dass der Taupunkt der Wasserstoff-Wasserdampf-Atmosphäre während der Phasen Halten und Abkühlen erfasst und in Abgleichung mit empirisch ermittelten Sollwerten automatisch geregelt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass
als Sollwert die Prozesstemperatur erfasst wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass
als Sollwert die Glühgut-Zusammensetzung erfasst wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Sollwert die eingetragene Menge an Wasserstoff-Wasserdampf-Ofengas erfasst wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass
als Sollwert die Dosierzeit des Wasserstoff-Wasserdampf-Ofengases erfasst wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der jeweilige Sauerstoffpartialdruck der Wasserstoff-Wasserdampf-Atmosphäre als Messgröße erfasst wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10255590A DE10255590A1 (de) | 2002-11-28 | 2002-11-28 | Verfahren zum kleberfreien Glühen von Metallteilen |
DE10255590 | 2002-11-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1424402A1 true EP1424402A1 (de) | 2004-06-02 |
EP1424402B1 EP1424402B1 (de) | 2007-09-26 |
Family
ID=32240499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03027065A Expired - Lifetime EP1424402B1 (de) | 2002-11-28 | 2003-11-25 | Verfahren zum kleberfreien Glühen von Metallteilen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1424402B1 (de) |
AT (1) | ATE374262T1 (de) |
DE (2) | DE10255590A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT500686A1 (de) * | 2004-06-28 | 2006-02-15 | Ebner Ind Ofenbau | Verfahren zur wärmebehandlung eines metallbandes vor einer metallischen beschichtung |
DE102018217284A1 (de) * | 2018-10-10 | 2020-04-16 | Siemens Aktiengesellschaft | Verbesserung des Niedertemperatur-Oxidationswiderstands von Chromstahl, Bauteil und Verfahren |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2456370C2 (ru) * | 2010-07-26 | 2012-07-20 | Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет" (СГТУ) | Способ паротермического оксидирования стальных изделий и печь для его осуществления |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05306446A (ja) * | 1992-05-01 | 1993-11-19 | Nippon Steel Corp | 高強度合金化溶融亜鉛めっき鋼板の製造方法 |
US5344509A (en) * | 1992-03-09 | 1994-09-06 | Messer Griesheim Gmbh | Process for prevent the formation of adhesives when annealing steel band |
JPH0853712A (ja) * | 1994-08-09 | 1996-02-27 | Nippon Steel Corp | 連続脱炭焼鈍炉における露点分布制御方法 |
DE19531447A1 (de) * | 1995-08-26 | 1997-02-27 | Messer Griesheim Gmbh | Verfahren zum Vermeiden von Klebern beim Glühen von Kaltband |
US5772428A (en) | 1996-02-09 | 1998-06-30 | Praxair Technology, Inc. | Method and apparatus for heat treatment including H2 /H2 O furnace region control |
JPH11158559A (ja) * | 1997-11-27 | 1999-06-15 | Sumitomo Metal Ind Ltd | 連続焼鈍炉の炉内雰囲気制御方法 |
EP0928834A1 (de) * | 1998-01-12 | 1999-07-14 | The BOC Group plc | Verfahren und Vorrichtung zum Kontrollieren des Taupunktes einer Ofenatmosphäre |
-
2002
- 2002-11-28 DE DE10255590A patent/DE10255590A1/de not_active Ceased
-
2003
- 2003-11-25 DE DE50308274T patent/DE50308274D1/de not_active Expired - Lifetime
- 2003-11-25 EP EP03027065A patent/EP1424402B1/de not_active Expired - Lifetime
- 2003-11-25 AT AT03027065T patent/ATE374262T1/de active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5344509A (en) * | 1992-03-09 | 1994-09-06 | Messer Griesheim Gmbh | Process for prevent the formation of adhesives when annealing steel band |
EP0560172B1 (de) | 1992-03-09 | 1997-08-20 | Messer Griesheim Gmbh | Verfahren zum Vermeiden von Klebern beim Glühen von Stahlband |
JPH05306446A (ja) * | 1992-05-01 | 1993-11-19 | Nippon Steel Corp | 高強度合金化溶融亜鉛めっき鋼板の製造方法 |
JPH0853712A (ja) * | 1994-08-09 | 1996-02-27 | Nippon Steel Corp | 連続脱炭焼鈍炉における露点分布制御方法 |
DE19531447A1 (de) * | 1995-08-26 | 1997-02-27 | Messer Griesheim Gmbh | Verfahren zum Vermeiden von Klebern beim Glühen von Kaltband |
US5772428A (en) | 1996-02-09 | 1998-06-30 | Praxair Technology, Inc. | Method and apparatus for heat treatment including H2 /H2 O furnace region control |
JPH11158559A (ja) * | 1997-11-27 | 1999-06-15 | Sumitomo Metal Ind Ltd | 連続焼鈍炉の炉内雰囲気制御方法 |
EP0928834A1 (de) * | 1998-01-12 | 1999-07-14 | The BOC Group plc | Verfahren und Vorrichtung zum Kontrollieren des Taupunktes einer Ofenatmosphäre |
Non-Patent Citations (3)
Title |
---|
DATABASE WPI Section Ch Week 199351, Derwent World Patents Index; Class M13, AN 1993-408963, XP002274257 * |
DATABASE WPI Section Ch Week 199618, Derwent World Patents Index; Class L03, AN 1996-175871, XP002274256 * |
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 11 30 September 1999 (1999-09-30) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT500686A1 (de) * | 2004-06-28 | 2006-02-15 | Ebner Ind Ofenbau | Verfahren zur wärmebehandlung eines metallbandes vor einer metallischen beschichtung |
AT500686B1 (de) * | 2004-06-28 | 2007-03-15 | Ebner Ind Ofenbau | Verfahren zur wärmebehandlung eines metallbandes vor einer metallischen beschichtung |
DE102018217284A1 (de) * | 2018-10-10 | 2020-04-16 | Siemens Aktiengesellschaft | Verbesserung des Niedertemperatur-Oxidationswiderstands von Chromstahl, Bauteil und Verfahren |
Also Published As
Publication number | Publication date |
---|---|
DE10255590A1 (de) | 2004-06-17 |
ATE374262T1 (de) | 2007-10-15 |
EP1424402B1 (de) | 2007-09-26 |
DE50308274D1 (de) | 2007-11-08 |
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