EP0311030A1 - Procédé de recuit d'articles métalliques dans un four continu - Google Patents
Procédé de recuit d'articles métalliques dans un four continu 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- Withdrawn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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873733884 DE3733884A1 (de) | 1987-10-07 | 1987-10-07 | Verfahren zum gluehen von metallteilen in durchlaufoefen |
| DE3733884 | 1987-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0311030A1 true EP0311030A1 (fr) | 1989-04-12 |
Family
ID=6337799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88116437A Withdrawn EP0311030A1 (fr) | 1987-10-07 | 1988-10-05 | Procédé de recuit d'articles métalliques dans un four continu |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0311030A1 (fr) |
| DE (1) | DE3733884A1 (fr) |
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 (fr) * | 1994-06-07 | 1999-04-28 | Nisshin Steel Co Ltd | Dispositif d'etancheite pour orifices d'admission/sortie d'un four de traitement thermique a atmosphere protectrice |
| FR2809418A1 (fr) * | 2000-05-25 | 2001-11-30 | Stein Heurtey | Procede de mise en securisation d'une enceinte de traitement thermique fonctionnant sous atmosphere controlee |
| EP1408126A3 (fr) * | 1998-03-26 | 2004-07-21 | JFE Steel Corporation | Four de traitement thermique continu |
| EP1679385A4 (fr) * | 2003-10-17 | 2007-05-30 | Chugai Ro Kogyo Kaisha Ltd | Procede de commande de four a recuit blanc |
| WO2008000945A1 (fr) * | 2006-06-30 | 2008-01-03 | Fives Stein | Dispositif de sécurisation d'un four équipe d'un chauffage et d'un refroidissement rapides fonctionnant sous atmosphère contrôlée. |
| 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 (de) * | 1992-08-06 | 1994-02-10 | Linde Ag | Verfahren zum kontinuierlichen Glühen von metallischem Gut unter wasserstoffreichem Schutzgas |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD31283A (fr) * | ||||
| GB995883A (en) * | 1962-07-05 | 1965-06-23 | Davy & United Eng Co Ltd | Continuous heat treatment of metal strip |
| DD243717A5 (de) * | 1985-09-18 | 1987-03-11 | Baumeister,Klaus,Dd | Verfahren zur waermebehandlung von band- oder drahtfoermigem gut |
| US4696226A (en) * | 1986-08-28 | 1987-09-29 | Witmer Warner H | Fluid barrier curtain system |
| EP0075438B1 (fr) * | 1981-09-19 | 1987-12-16 | BOC Limited | Traitement thermique de métaux |
-
1987
- 1987-10-07 DE DE19873733884 patent/DE3733884A1/de not_active Withdrawn
-
1988
- 1988-10-05 EP EP88116437A patent/EP0311030A1/fr not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD31283A (fr) * | ||||
| GB995883A (en) * | 1962-07-05 | 1965-06-23 | Davy & United Eng Co Ltd | Continuous heat treatment of metal strip |
| EP0075438B1 (fr) * | 1981-09-19 | 1987-12-16 | BOC Limited | Traitement thermique de métaux |
| DD243717A5 (de) * | 1985-09-18 | 1987-03-11 | Baumeister,Klaus,Dd | Verfahren zur waermebehandlung von band- oder drahtfoermigem gut |
| 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 (fr) * | 1994-06-07 | 1999-04-28 | Nisshin Steel Co Ltd | Dispositif d'etancheite pour orifices d'admission/sortie d'un four de traitement thermique a atmosphere protectrice |
| EP1408126A3 (fr) * | 1998-03-26 | 2004-07-21 | JFE Steel Corporation | Four de traitement thermique continu |
| FR2809418A1 (fr) * | 2000-05-25 | 2001-11-30 | Stein Heurtey | Procede de mise en securisation d'une enceinte de traitement thermique fonctionnant sous atmosphere controlee |
| EP1160342A1 (fr) * | 2000-05-25 | 2001-12-05 | Stein Heurtey | Procédé de mise en sécurisation d'une enceinte de traitement thermique fonctionnant sous atmosphère contrôlée |
| EP1679385A4 (fr) * | 2003-10-17 | 2007-05-30 | Chugai Ro Kogyo Kaisha Ltd | Procede de commande de four a recuit blanc |
| WO2008000945A1 (fr) * | 2006-06-30 | 2008-01-03 | Fives Stein | Dispositif de sécurisation d'un four équipe d'un chauffage et d'un refroidissement rapides fonctionnant sous atmosphère contrôlée. |
| FR2903122A1 (fr) * | 2006-06-30 | 2008-01-04 | Stein Heurtey | Dispositif de securisation d'un four equipe d'un chauffage et d'un refroidissement rapides fonctionnant sous atmosphere controlee. |
| JP2009541598A (ja) * | 2006-06-30 | 2009-11-26 | ファイブス シュタイン | 管理雰囲気下における急速加熱工程および急速冷却工程を備えた炉に対する安全システム |
| EA012867B1 (ru) * | 2006-06-30 | 2009-12-30 | Фив Стэн | Устройство для обеспечения безопасности печи, снабженной системой быстрого охлаждения и нагрева, работающей в контролируемой среде |
| CN101466852B (zh) * | 2006-06-30 | 2010-08-25 | 法孚斯坦因公司 | 在受控气氛下运行的配有快速加热和冷却区部的炉子的安全装置 |
| 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 (de) | 1989-04-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE FR IT LU NL |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19891013 |