EP1114196B2 - Verfahren zur reinigung von metalloberflächen - Google Patents

Verfahren zur reinigung von metalloberflächen Download PDF

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Publication number: EP1114196B2
Authority: EP; European Patent Office
Prior art keywords: furnace; gas; hydrogen; protective; steady
Prior art date: 1998-09-07
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.): Expired - Lifetime

Application number

EP99942869A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP1114196A1 (de

EP1114196B1 (de

Inventor

Hans-Peter Schmidt

Peter Zylla

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Air Liquide Deutschland GmbH

Messer Group GmbH

Original Assignee

Air Liquide Deutschland GmbH

Messer Group GmbH

Priority date (The priority date 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 date listed.)

1998-09-07

Filing date

1999-08-13

Publication date

2006-04-12

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7880080&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1114196(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1999-08-13 Application filed by Air Liquide Deutschland GmbH, Messer Group GmbH filed Critical Air Liquide Deutschland GmbH

2001-07-11 Publication of EP1114196A1 publication Critical patent/EP1114196A1/de

2002-05-02 Application granted granted Critical

2002-05-02 Publication of EP1114196B1 publication Critical patent/EP1114196B1/de

2006-04-12 Publication of EP1114196B2 publication Critical patent/EP1114196B2/de

2019-08-13 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 42
238000004140 cleaning Methods 0.000 title claims description 19
229910052739 hydrogen Inorganic materials 0.000 claims abstract description 38
239000001257 hydrogen Substances 0.000 claims abstract description 36
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
239000007789 gas Substances 0.000 claims description 52
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 25
230000001681 protective effect Effects 0.000 claims description 19
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 17
238000010438 heat treatment Methods 0.000 claims description 15
229910052751 metal Inorganic materials 0.000 claims description 15
239000002184 metal Substances 0.000 claims description 15
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
239000001301 oxygen Substances 0.000 claims description 11
229910052760 oxygen Inorganic materials 0.000 claims description 11
238000001816 cooling Methods 0.000 claims description 10
238000007254 oxidation reaction Methods 0.000 claims description 10
230000003647 oxidation Effects 0.000 claims description 9
238000010923 batch production Methods 0.000 claims description 6
238000005259 measurement Methods 0.000 claims description 3
238000010924 continuous production Methods 0.000 claims description 2
229910001873 dinitrogen Inorganic materials 0.000 claims description 2
229910052756 noble gas Inorganic materials 0.000 claims description 2
239000007769 metal material Substances 0.000 claims 2
229910052799 carbon Inorganic materials 0.000 abstract description 11
238000000137 annealing Methods 0.000 abstract description 9
UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
239000000463 material Substances 0.000 abstract description 8
229910002090 carbon oxide Inorganic materials 0.000 abstract description 3
238000012546 transfer Methods 0.000 abstract description 2
230000009466 transformation Effects 0.000 abstract 1
239000000203 mixture Substances 0.000 description 20
239000000523 sample Substances 0.000 description 13
239000011261 inert gas Substances 0.000 description 12
229910002091 carbon monoxide Inorganic materials 0.000 description 9
238000006243 chemical reaction Methods 0.000 description 9
238000002347 injection Methods 0.000 description 9
239000007924 injection Substances 0.000 description 9
VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
229910052757 nitrogen Inorganic materials 0.000 description 8
CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
230000015572 biosynthetic process Effects 0.000 description 6
239000000047 product Substances 0.000 description 6
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
239000000571 coke Substances 0.000 description 5
239000004071 soot Substances 0.000 description 5
230000001052 transient effect Effects 0.000 description 4
238000010521 absorption reaction Methods 0.000 description 3
229910002092 carbon dioxide Inorganic materials 0.000 description 3
239000001569 carbon dioxide Substances 0.000 description 3
238000011109 contamination Methods 0.000 description 3
230000000694 effects Effects 0.000 description 3
230000004992 fission Effects 0.000 description 3
150000002431 hydrogen Chemical class 0.000 description 3
UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
230000001680 brushing effect Effects 0.000 description 2
239000006229 carbon black Substances 0.000 description 2
230000003749 cleanliness Effects 0.000 description 2
239000011248 coating agent Substances 0.000 description 2
238000000576 coating method Methods 0.000 description 2
230000001276 controlling effect Effects 0.000 description 2
230000007423 decrease Effects 0.000 description 2
230000003247 decreasing effect Effects 0.000 description 2
238000009434 installation Methods 0.000 description 2
229910052742 iron Inorganic materials 0.000 description 2
235000013980 iron oxide Nutrition 0.000 description 2
VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 2
238000002156 mixing Methods 0.000 description 2
238000005554 pickling Methods 0.000 description 2
238000010926 purge Methods 0.000 description 2
230000001105 regulatory effect Effects 0.000 description 2
238000005096 rolling process Methods 0.000 description 2
239000000126 substance Substances 0.000 description 2
238000010744 Boudouard reaction Methods 0.000 description 1
102100021102 Hyaluronidase PH-20 Human genes 0.000 description 1
101150055528 SPAM1 gene Proteins 0.000 description 1
229910000831 Steel Inorganic materials 0.000 description 1
MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
229910052786 argon Inorganic materials 0.000 description 1
238000009835 boiling Methods 0.000 description 1
238000001354 calcination Methods 0.000 description 1
UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
230000015556 catabolic process Effects 0.000 description 1
239000007795 chemical reaction product Substances 0.000 description 1
239000003795 chemical substances by application Substances 0.000 description 1
238000003776 cleavage reaction Methods 0.000 description 1
238000009833 condensation Methods 0.000 description 1
230000005494 condensation Effects 0.000 description 1
239000000470 constituent Substances 0.000 description 1
230000007547 defect Effects 0.000 description 1
238000006731 degradation reaction Methods 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
230000008021 deposition Effects 0.000 description 1
238000011161 development Methods 0.000 description 1
230000018109 developmental process Effects 0.000 description 1
239000003792 electrolyte Substances 0.000 description 1
230000002349 favourable effect Effects 0.000 description 1
238000011010 flushing procedure Methods 0.000 description 1
229930195733 hydrocarbon Natural products 0.000 description 1
150000002430 hydrocarbons Chemical class 0.000 description 1
SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
239000000314 lubricant Substances 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
238000002844 melting Methods 0.000 description 1
230000008018 melting Effects 0.000 description 1
150000002739 metals Chemical class 0.000 description 1
238000012544 monitoring process Methods 0.000 description 1
230000007935 neutral effect Effects 0.000 description 1
RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
239000002244 precipitate Substances 0.000 description 1
239000002243 precursor Substances 0.000 description 1
230000002035 prolonged effect Effects 0.000 description 1
238000000746 purification Methods 0.000 description 1
230000007017 scission Effects 0.000 description 1
239000010959 steel Substances 0.000 description 1
238000003860 storage Methods 0.000 description 1
229930195735 unsaturated hydrocarbon Natural products 0.000 description 1

Images

Classifications

- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- 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 cleaning metal surfaces for stationary batch processes in stationary furnace installations and for unsteady flow processes in unsteady furnaces under hydrogen-inert protective gas atmospheres with less than 30% by volume of hydrogen.
DE-A-323 33 74, DE-A-37 25 174 and EP-A-0 271 135 describe a method for cleaning metal surfaces for stationary batch processes in stationary furnace installations or for unsteady flow processes in non-stationary furnaces under low-hydrogen inert gas atmospheres with the phases heating, holding and cooling, wherein in the holding phase of the protective gas atmosphere water or water vapor is supplied to the oxidation of carbon residues.
EP 0 572 780 A2 discloses a device and a method in which metal parts, preferably metal strips, are cleaned in a cleaning chamber as a precursor to the annealing process.
the metal strip surface is here in the cold state with hydrogen-rich hot gas mixtures with a hydrogen content of 30-70 vol.% Impacted by impingement. So in a time of a few seconds, the oil residues are evaporated and discharged from the cleaning chamber.
the strip then passes into a continuous furnace where it is heat treated.
the tape is unwound from the coil and passes through a subsequent oven.
the technical gases used have a high purity, typically a purity of 99.99 vol.%, So that their moisture or residual oxygen content is very low. This high purity ensures a relatively consistent quality and reliability of processes and products. Because contamination of these gases used, for example, oxygen, carbon dioxide or water vapor, can lead to uncontrolled oxidation reactions, which have a negative effect on the quality of the treated surfaces.
the invention has for its object to provide a method which allows cleaning using a low-hydrogen inert gas atmosphere during the heat treatment process in the holding phase both transient furnace systems and stationary furnace systems and which a high surface cleanliness of the heat-treating metal parts, even in the wound state in Form of coils, coils or coils, guaranteed.
hydrogen-inert gas here means a protective gas with a proportion of less than 30% by volume, preferably less than 5% by volume, of hydrogen, the remainder being in particular nitrogen and / or noble gas (e).
the humidification of the protective gas atmosphere in the furnace during the holding phase initiated by the method according to the invention makes it possible to clean the treated surfaces of the annealed material without causing mass transfer with the metal parts.
a certain amount of water is added to the low-hydrogen inert gas.
carbon residues are degraded by oxidation.
the reaction products of carbon oxidation are volatile and are taken up in the gas phase. This cleaning process is advantageously carried out during the heat treatment in the holding phase and is preferably monitored and regulated.
carbon is meant here a baked-in, firm coating which essentially contains carbon and oxidic constituents.
This process essentially depends on the melting, splitting and boiling temperatures of the rolling lubricants. In practice, the cleavage of the substances at temperatures of about 400 ° C is observed. Whether or not the volatile fission products are desorbed from the surface with or without residues depends essentially on the amount of draw or roll, surface area treated and rate of heating. In the case of large quantities and fast heating rates, remaining coke is burned into the metal surface in the further course of the calcination and can only be removed by pickling or brushing. This has a negative effect on the surface quality.
the reaction rate here is relatively slow and the absorption capacity of the gas atmosphere of carbon is relatively large.
the absorption capacity decreases markedly with increasing temperature and decreasing hydrogen contents. If a nitrogen / hydrogen gas mixture with a proportion of 5% by volume of hydrogen, for example, is heated to 700 ° C., then a maximum methane content of only 0.034% by volume can be achieved, which is about 320 times lower in comparison with a 100% hydrogen atmosphere is.
the absorption capacity of carbon in a low-hydrogen inert gas atmosphere is increased by the inventive admixture of water vapor to the nitrogen / hydrogen gas mixture. This water vapor can effectively remove the baked carbon residue.
the shielding gas is moistened defined after reaching the holding temperature.
the feed water is fed in such amounts (e.g., via a lance) that iron oxidation of the treated material does not occur and conversion of the coke to volatile carbon oxides is initiated. For this reason, monitoring the process is advantageous.
the control of the water feed by means of an oxygen probe, e.g. ⁇ probe, preferred.
the carbon coating is converted with water vapor to volatile carbon monoxide and hydrogen.
the high holding temperature favors the sequence of the so initiated cleaning.
the formed carbon monoxide is further oxidized to carbon dioxide:
the forming amounts of carbon monoxide and carbon dioxide are determined by the temperature dependence of the water gas reaction.
the amount of water depends essentially on the hydrogen concentration in the protective gas, the treated material and the free volume of the annealing furnace. It is determined by the oxygen partial pressure or the ratio of the corresponding partial pressures (P H2O / P H2 ), wherein the limit values are to be chosen so that the formation of iron oxides does not occur. Such oxidation of the metal surface is undesirable. It is advantageously avoided by controlling the protective gas composition in order to control the process flow, preferably in each period of the process.
an oxygen probe for example a zirconium dioxide solid-state electrolyte cell or a lambda probe.
the atmosphere is then adjusted depending on the measured value in dependence on the treated material so that an oxide-free treatment of the material is ensured. This is done by switching on / off the water supply and optionally a carbon neutral treatment by appropriate control of protective gas purging. This procedure is very advantageous especially for stationary furnaces.
the probe voltage of the oxygen probe is dependent on the furnace temperature and the P H2O / P H2 ratio of the furnace gas, as shown in Fig. 1.
the atmosphere in the oven is controlled so that a certain probe voltage is kept constant, so that an optimal cleaning of the surface can take place.
the probe voltage can vary within a certain measuring range, without affecting the cleaning effect.
the stability of the iron oxides depends on the temperature and the ratio of the partial pressures of water vapor to hydrogen. Below 560 ° C, magnetite (Fe 3 O 4 ) formation occurs and, above this temperature, oxidation to FeO occurs. For annealing under nitrogen-hydrogen gas mixtures, a P H2O / P H2 ratio of 0.10 has proved favorable. If, for example, a low-alloyed steel is treated with a gas mixture of nitrogen and 5% by volume of hydrogen, the water vapor content is set to 0.5% by volume, which corresponds to a dew point of the inert gas atmosphere of -2 ° C. This dew point is advantageously measured by means of internal or external measuring cells and regulated by controlling valves, such as solenoid valves, so that no water condenses out at the cold spots.
Fig. 2 shows schematically an apparatus for carrying out the method with a controlled water injection into the furnace.
the device shown in Fig. 2 comprises a furnace 1, in which a Wasserinjektorverdampfer 2, a gas injection tube 3 for inert gas and a Sauerstoffmeßsonde 4 are arranged.
the measured in the Sauerstoffmeßsonde 4 signal enters a control unit 5, in which the current measured value (actual value) in the furnace 1 is continuously compared in the holding phase with a target value (target value).
the actual value may be based on the oxygen partial pressure or the (P H2O / P H2 ) ratio.
the control unit 5 controls solenoid valves 6a and 6b which are arranged in the water injector evaporator 2 and to which water is supplied from a water reservoir 8 via a line 7.
the metered addition of water takes place cyclically at intervals of preferably about 5 minutes.
the forming in the interior of the furnace 1 steam is distributed evenly in this period by circulating fans of the furnace 1 in the gas atmosphere of the furnace 1. Further injections take place until the actual value and setpoint value agree.
the amount of water that is sprayed per injection is measured by a flow measuring device 9 and adjusted via a control device 17, preferably a valve.
the timing of the injection is set by a timer on the control unit 5. After reaching the setpoint value in the furnace 1, the water injection into the protective gas atmosphere is interrupted by closing the solenoid valves 6a and 6b. At the same time, the time signal for the injection cycle is interrupted.
the Wasserinjektorverdampfer 2 here with two solenoid valves 6a and 6b, which are arranged one behind the other, equipped.
the protective gas atmosphere is adjusted by supplying a nitrogen and hydrogen-containing gas mixture. Nitrogen is taken from a storage container 10, adjusted to ambient temperature, for example by the air evaporator 11 shown here and fed via a line 12 to a mixing device 13, which is also supplied via a line 14 hydrogen from a reservoir 15 at the same time.
the gas mixture from the mixing device 13 is supplied via a line 16 to the protective gas injection tube 3, wherein the inert gas supply is controlled by means of devices according to the prior art.
a nitrogen / hydrogen mixture containing 5 vol.% Hydrogen was humidified at 700 ° C to a dew point of -2 ° C.
P H2O / P H2 ratio 0.10
an equilibrium composition of the inert gas atmosphere was established, which was about 12.24 vol.% H 2 , 1.22 vol.% H 2 O, 6.74 vol. % CO, 0.50 vol.% CO 2 , 0.20 vol.% CH 4 , balance N 2 contained.
the measured values of the probes used were -1110 mV for the lambda probe and -1071 mV (H 2 O / H 2 ) for the oxygen probe.
the partial pressure ratio P H2O / P H was 0.10.
the sum of the carbon-containing component Cx (% CO +% CO 2 +% CH 4 ) of the moist, in chemical equilibrium gas mixture is 7.44% and is thus about 220 times greater compared to a dry gas mixture.
the factor of 220 shows the strong influence of humidification on the cleaning properties of low-hydrogen inert gas atmospheres.
the carbon uptake here is almost comparable to that in a pure hydrogen atmosphere. This is especially true for gas mixtures with low hydrogen content, below 30 vol.%, Preferably below 5 vol.%. As H 2 levels increase, this factor decreases and for pure hydrogen at 1.5% humidity it is comparable to purification via methane production.

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Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Materials Engineering (AREA)
Organic Chemistry (AREA)
Metallurgy (AREA)
Mechanical Engineering (AREA)
Crystallography & Structural Chemistry (AREA)
Physics & Mathematics (AREA)
Thermal Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
General Chemical & Material Sciences (AREA)
Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Furnace Details (AREA)
Heat Treatment Of Strip Materials And Filament Materials (AREA)
Physical Vapour Deposition (AREA)
Manufacture And Refinement Of Metals (AREA)
Chemical Treatment Of Metals (AREA)
Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Heat Treatment Of Articles (AREA)

EP99942869A 1998-09-07 1999-08-13 Verfahren zur reinigung von metalloberflächen Expired - Lifetime EP1114196B2 (de)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
DE19840778		1998-09-07
DE19840778A DE19840778A1 (de)	1998-09-07	1998-09-07	Verfahren und Vorrichtung zur Reinigung von Metalloberflächen
PCT/EP1999/005960 WO2000014289A1 (de)	1998-09-07	1999-08-13	Verfahren und vorrichtung zur reinigung von metalloberflächen

Publications (3)

Publication Number	Publication Date
EP1114196A1 EP1114196A1 (de)	2001-07-11
EP1114196B1 EP1114196B1 (de)	2002-05-02
EP1114196B2 true EP1114196B2 (de)	2006-04-12

Family

ID=7880080

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP99942869A Expired - Lifetime EP1114196B2 (de)	1998-09-07	1999-08-13	Verfahren zur reinigung von metalloberflächen

Country Status (6)

Country	Link
EP (1)	EP1114196B2 (pl)
AT (1)	ATE217029T1 (pl)
DE (2)	DE19840778A1 (pl)
PL (1)	PL193048B1 (pl)
WO (1)	WO2000014289A1 (pl)
YU (1)	YU49428B (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10162702C1 (de) *	2001-12-19	2003-04-17	Messer Griesheim Gmbh	Verfahren zur Vermeidung von Klebern und Kratzern beim Rekristallisationsglühen von Kaltband
DE10215857A1 (de) *	2002-04-10	2003-10-23	Linde Ag	Vorrichtung und Verfahren zur Kontrolle der Zusammensetzung einer Gasatmosphäre
WO2009149903A1 (de)	2008-06-13	2009-12-17	Loi Thermoprocess Gmbh	Verfahren zum hochtemperatur-glühen von kornorientiertem elektroband in einer schutzgasatmospäre in einem wärmebehandlungsofen
DE102010032919B4 (de) *	2010-07-30	2023-10-05	Air Liquide Deutschland Gmbh	Verfahren und Vorrichtung zum Befeuchten eines brennbaren Gases

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE3233374A1 (de) *	1982-09-08	1984-03-08	Sumitomo Metal Industries, Ltd., Osaka	Verfahren zur herstellung eines gereinigten kaltgewalzten stahlbandes
EP0157708B1 (fr) *	1984-04-05	1990-10-10	Stein Heurtey	Procédé de dégraissage d'une bande métallique laminée à froid
DE3639657A1 (de) *	1986-11-20	1988-06-01	Philips Patentverwaltung	Verfahren zum reinigen von metallbauteilen fuer kathodenstrahlroehren
DE3725174A1 (de) *	1987-07-29	1989-02-09	Linde Ag	Verfahren zum blank- und rekristallisationsgluehen
BE1001323A3 (fr) *	1988-01-15	1989-09-26	Cockerill Sambre Sa	Procede de controle de l'atmosphere humide dans un four de traitement thermique et installation a cet effet.
DE4428614C2 (de) *	1994-08-12	1999-07-01	Loi Thermprocess Gmbh	Verfahren zum Glühen von Metallteilen
DE4207394C1 (pl) *	1992-03-09	1993-02-11	Messer Griesheim Gmbh, 6000 Frankfurt, De
DE59300400D1 (de) *	1992-04-06	1995-08-31	Ebg Elektromagnet Werkstoffe	Verfahren und Vorrichtung zur Reinigung von Metallbandoberflächen durch Gasspülung in wasserstoffreichen Atmosphären.
DE4241746C1 (de) *	1992-12-11	1994-08-25	Messer Griesheim Gmbh	Verfahren zum rußfreien Glühen von Stahlband in einem Glühofen
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
- 1998-09-07 DE DE19840778A patent/DE19840778A1/de not_active Ceased
1999
- 1999-08-13 DE DE59901364T patent/DE59901364D1/de not_active Expired - Lifetime
- 1999-08-13 AT AT99942869T patent/ATE217029T1/de not_active IP Right Cessation
- 1999-08-13 PL PL346466A patent/PL193048B1/pl not_active IP Right Cessation
- 1999-08-13 EP EP99942869A patent/EP1114196B2/de not_active Expired - Lifetime
- 1999-08-13 WO PCT/EP1999/005960 patent/WO2000014289A1/de not_active Ceased
- 1999-08-20 YU YU39999A patent/YU49428B/sh unknown

Also Published As

Publication number	Publication date
PL193048B1 (pl)	2007-01-31
WO2000014289A1 (de)	2000-03-16
YU39999A (sh)	2001-12-26
DE59901364D1 (de)	2002-06-06
ATE217029T1 (de)	2002-05-15
DE19840778A1 (de)	2000-03-09
EP1114196A1 (de)	2001-07-11
YU49428B (sh)	2006-01-16
PL346466A1 (en)	2002-02-11
EP1114196B1 (de)	2002-05-02

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