EP1052310A2 - Verfahren und Vorrichtung zur Emaillierung der Oberfläche eines Stahlkörpers - Google Patents
Verfahren und Vorrichtung zur Emaillierung der Oberfläche eines Stahlkörpers Download PDFInfo
- Publication number
- EP1052310A2 EP1052310A2 EP00250102A EP00250102A EP1052310A2 EP 1052310 A2 EP1052310 A2 EP 1052310A2 EP 00250102 A EP00250102 A EP 00250102A EP 00250102 A EP00250102 A EP 00250102A EP 1052310 A2 EP1052310 A2 EP 1052310A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- enamelling
- steel body
- direct
- station
- enamel
- 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- Withdrawn
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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
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
-
- 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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- 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
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D3/00—Chemical treatment of the metal surfaces prior to coating
-
- 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
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
- C23D5/005—Coating with enamels or vitreous layers by a method specially adapted for coating special objects
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Definitions
- the invention relates to a method and a device for enamelling the Surface of a steel body, in particular a pipe outer surface, according to the Preambles of claims 1 and 6.
- Corrosion protection The enameling of the surface of a steel body represents an effective one Corrosion protection. Like the article "Corrosion-protected heat exchanger” (Magazine CIT, 11/1998), one is suitable for heat exchangers Enamelling as protection against corrosive media. Corrosive media join Heat exchangers in flue gas desulfurization plants in the form of highly corrosive Flue gases and their condensates. Especially the outside surface of the as Hairpins called U-tubes inside the heat exchanger is one exposed to increased risk of corrosion.
- a longer service life is achieved if the steel pipes are directly enamelled with an enamel material that is already in the first layer is resistant.
- direct enamelling for example with the powder electrostatic process (PUESTA process) - is a fully decarburized tubular steel material with a Provide a layer of corrosion-resistant direct enamel.
- This first layer follows usually a second layer of even more resistant special enamel. It arises a higher quality composite material than conventional enamelling between steel and enamel with the advantage of an improved service life when Use in a corrosive environment.
- PESTA process powder electrostatic process
- This steel material is made by a complex Vacuum treatment completely decarburized in the liquid phase, with existing one Residual carbon is bound to titanium or by a so-called open coil annealing under a protective gas atmosphere in the solid phase. These procedures are quite complex to implement.
- the invention includes the technical teaching that the enamelling surface areas of a steel body only an edge decarburization undergo what is immediately followed by at least one layer of direct email is applied.
- the edge decarburization of a steel body is preferably created at the end of the Manufacturing process of the steel body itself, for example during the Final glow under a protective gas atmosphere.
- the final glow carried out in this way prevents scaling of the outer surface of the steel body.
- the outer The carbon is extracted from the layer of the steel body. So far there has been Experts believe that an area of a steel body that is only decarburized is not would be sufficient to directly enamel directly there, since through the thin layer of decarburization carbon from deeper layers of the Steel body would diffuse into the edge area. Attempts have this prejudice however not confirmed, so that at least one on a decarburized steel body Layer of direct email is applicable. So it is no longer necessary to Direct enamelling to use a fully decarburized steel body. The production of Direct enamelled steel bodies can be designed more cheaply.
- One measure improving the invention is that on the first layer a second layer made of corrosion-resistant special enamel highly corrosion-resistant direct email is applied.
- the degree of This increases the overall corrosion resistance of the enamelling. As a result this makes the enamelling more resistant.
- the direct enamelling of the decarburized steel body is preferred the known enamelling processes.
- the powder electrostatic process PESTA process
- secondly the wet electrostatic process ETE process
- ETE process electro-dip enamelling process
- the inventive method described above is preferably used performed a device in which the steel body for edge decarburization
- the annealing station passes through, with means for setting the edge decarburization producing protective gas atmosphere, and that the steel body for Applying at least one layer of direct email to a subsequent one Enamelling station goes through.
- two enamel layers are different in the enamelling station Composition can be applied one on top of the other.
- the Enamelling station only one layer of direct email or more than two layers to apply.
- a continuous passage through the annealing station and / or the subsequent one Enamel station For direct enamelling of a compact design A clocked pass through the annealing station is particularly suitable for the steel body and / or the enamelling station.
- the on the steel body, especially a U-steel tube in a heat exchanger, applied enamel layer preferably has a thickness between 200 and 600 Micrometers.
- a steel body 1 is first used in accordance with FIG Edge decarburization 2 made.
- the steel body 1 becomes one Glow station 3 supplied.
- the steel body 1 is under one Oxidation-preventing atmosphere from protective gas 4 heated.
- the shielding gas 4 consists of a mixture of hydrogen and nitrogen and prevents one Scaling of the outer surface of the steel body 1 during annealing.
- the glow under the protective gas 4 also has the effect of edge decarburization, i.e. that of the surface of the steel body 1 to a certain depth Carbon content is withdrawn.
- the thus decarburized steel body 1 is then an enamelling station 5 downstream of the edge decarburization 2 fed.
- the powder electrostatic process is used within the enamelling station 5 (PUESTA method) a first layer 6 on the steel body 1 Direct email applied and then burned in.
- This first layer 6 consists Made of corrosion-resistant direct email and can be used directly, i.e. without a conventional one Base enamel layer, on a steel body 1 made of inexpensive carbon steel, however decarburized is applied.
- a second layer 7 of special email is sent subsequently applied.
- the second layer 7 consists of higher against corrosion resistant email.
- This enamelling in two layers 6, 7 creates a steel body 1, which consists of inexpensive carbon steel and a highly resistant protection Enamel has, so that this composite is characterized by a high thermal conductivity.
- the outer surface 8 - as the detail "A" shows - to a depth 9 decarburized by annealing under protective gas.
- the outer surface 8 is with a Direct enamelling and special enamelling 10 provide a total thickness of 200 to 600 microns.
- Such a direct enamelled U-tube which is easy to manufacture, ensures Heat exchangers - for example in flue gas desulfurization plants - one effective protection against the attack of highly corrosive gases and their condensates, so that this results in an increased service life.
Abstract
Description
- Fig. 1
- eine prinzipielle Darstellung eines Verfahrens zur Direktemaillierung eines Stahlkörpers anhand eines Flußplanes und
- Fig. 2
- eine Querschnittsdarstellung eines direktemaillierten randentkohlten Rohres als Stahlkörper.
Claims (11)
- Verfahren zur Emaillierung der Oberfläche eines Stahlkörpers, insbesondere einer Rohraußenoberfläche, durch Direktemaillierung,
dadurch gekennzeichnet,
daß zu emaillierende Oberflächenbereiche des Stahlkörpers einer Randentkohlung unterzogen werden, worauf unmittelbar mindestens eine Schicht aus Direktemail aufgebracht wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß auf eine erste Schicht aus korrosionsresistentem Direktemail eine zweite Schicht aus hochkorrosionsresistentem Spezialemail aufgebracht wird. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Randentkohlung der Stahlkörper beim Glühen durch eine diese bewirkende Einstellung einer Atmosphäre aus Schutzgas durchgeführt wird. - Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß das Glühen im Zusammenhang mit dem den Herstellungsprozeß abschließenden Schlußglühen des Stahlkörpers durchgeführt wird. - Verfahren nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Direktemaillierung des Stahlkörpers im Pulver-Elektrostatik-Verfahren (PUESTA-Verfahren) oder im Naß-Elektrostatik-Verfahren (ESTA-Verfahren) oder im Elektro-Tauchemail-Verfahren (ETE-Verfahren) oder im Naßspritzverfahren durchgeführt wird. - Vorrichtung zur Emaillierung der Oberfläche eines Stahlkörpers, insbesondere einer Rohraußenoberfläche, durch Direktemaillierung,
dadurch gekennzeichnet,
daß der Stahlkörper (1) zur Randentkohlung eine Glühstation (3) durchläuft, die mit Mitteln zur Einstellung einer die Randentkohlung herbeiführenden Atmosphäre aus Schutzgas (4) ausgestattet ist, und daß der Stahlkörper (1) zur Aufbringung mindestens einer Schicht (6, 7) von Direktemail eine nachfolgende Emaillierstation (5) durchläuft. - Vorrichtung nach Anspruch 7,
dadurch gekennzeichnet,
daß mit der Emaillierstation (5) zwei Schichten (6 und 7) aus Direktemail und Spezialemail unterschiedlicher Zusammensetzung übereinander aufbringbar sind. - Vorrichtung nach Anspruch 7 oder 8,
dadurch gekennzeichnet,
daß zur Direktemaillierung eines langgestreckten Stahlkörpers (1) ein kontinuierlicher Durchlauf durch die Glühstation (3) und/oder die Emaillierstation (5) erfolgt. - Vorrichtung nach einem der Ansprüche 7 bis 9,
dadurch gekennzeichnet,
daß zur Direktemaillierung eines kompakt ausgebildeten Stahlkörpers (1) ein getakteter Durchlauf durch die Glühstation (3) und/oder die Emaillierstation (5) erfolgt. - Vorrichtung nach einem der Ansprüche 7 bis 10,
dadurch gekennzeichnet,
daß die auf den Stahlkörper (1) aufgebrachte Emaillierung (10) eine Dicke zwischen 200 und 600 Mikrometern aufweist. - Vorrichtung nach einem der Ansprüche 7 bis 11,
dadurch gekennzeichnet,
daß als Glühstation (3) eine Schlußglühstation am Ende des Herstellungsprozeßes des Stahlkörpers (1) vorgesehen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999122945 DE19922945C2 (de) | 1999-05-14 | 1999-05-14 | Verfahren und Vorrichtung zur Emaillierung der Oberfläche eines Stahlrohres |
DE19922945 | 1999-05-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1052310A2 true EP1052310A2 (de) | 2000-11-15 |
EP1052310A3 EP1052310A3 (de) | 2004-08-11 |
Family
ID=7908498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00250102A Withdrawn EP1052310A3 (de) | 1999-05-14 | 2000-03-28 | Verfahren und Vorrichtung zur Emaillierung der Oberfläche eines Stahlkörpers |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1052310A3 (de) |
DE (1) | DE19922945C2 (de) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2455331A (en) * | 1944-10-24 | 1948-11-30 | Joseph C Eckel | Method of enameling |
DE954607C (de) * | 1952-11-13 | 1956-12-20 | Robert Von Linde Dipl Ing | Verfahren zum Entkohlen der Oberflaechenschichten von Werkstuecken aus Eisen oder Stahl |
US3055779A (en) * | 1959-03-16 | 1962-09-25 | Pfaudler Permutit Inc | Method of making enameled ductile iron |
US3062685A (en) * | 1954-06-14 | 1962-11-06 | Pfaudler Permutit Inc | Chemical processing equipment |
FR1507123A (fr) * | 1966-01-07 | 1967-12-22 | United States Steel Corp | Fabrication d'acier à émailler amélioré |
US3406047A (en) * | 1966-02-07 | 1968-10-15 | Wilson Eng Co Inc Lee | Vitreous enameling steel and method of making same |
US3598658A (en) * | 1967-05-20 | 1971-08-10 | Yawata Iron & Steel Co | Method for manufacturing cold-rolled steel sheet |
FR2123391A3 (en) * | 1971-01-29 | 1972-09-08 | Uss Eng & Consult | Enamelling steel - contng silicon for direct enamelling and low carbon content for deep drawing |
FR2332809A1 (fr) * | 1975-11-26 | 1977-06-24 | Air Ind | Procede et installation de poudrage electrostatique |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1871C (de) * | j. parkinson, Fabrikant in Bradford (England) | Neuerungen an Breithaltern für Webstühle | ||
DE4124801C2 (de) * | 1991-07-26 | 1995-03-30 | Bayer Ag | Emailfritte für die Direktemaillierung auf ungebeiztem Stahlblech und deren Verwendung |
-
1999
- 1999-05-14 DE DE1999122945 patent/DE19922945C2/de not_active Expired - Fee Related
-
2000
- 2000-03-28 EP EP00250102A patent/EP1052310A3/de not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2455331A (en) * | 1944-10-24 | 1948-11-30 | Joseph C Eckel | Method of enameling |
DE954607C (de) * | 1952-11-13 | 1956-12-20 | Robert Von Linde Dipl Ing | Verfahren zum Entkohlen der Oberflaechenschichten von Werkstuecken aus Eisen oder Stahl |
US3062685A (en) * | 1954-06-14 | 1962-11-06 | Pfaudler Permutit Inc | Chemical processing equipment |
US3055779A (en) * | 1959-03-16 | 1962-09-25 | Pfaudler Permutit Inc | Method of making enameled ductile iron |
FR1507123A (fr) * | 1966-01-07 | 1967-12-22 | United States Steel Corp | Fabrication d'acier à émailler amélioré |
US3406047A (en) * | 1966-02-07 | 1968-10-15 | Wilson Eng Co Inc Lee | Vitreous enameling steel and method of making same |
US3598658A (en) * | 1967-05-20 | 1971-08-10 | Yawata Iron & Steel Co | Method for manufacturing cold-rolled steel sheet |
FR2123391A3 (en) * | 1971-01-29 | 1972-09-08 | Uss Eng & Consult | Enamelling steel - contng silicon for direct enamelling and low carbon content for deep drawing |
FR2332809A1 (fr) * | 1975-11-26 | 1977-06-24 | Air Ind | Procede et installation de poudrage electrostatique |
Also Published As
Publication number | Publication date |
---|---|
EP1052310A3 (de) | 2004-08-11 |
DE19922945C2 (de) | 2003-10-30 |
DE19922945A1 (de) | 2000-11-16 |
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