EP0959145B1 - Verfahren und Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses - Google Patents
Verfahren und Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses Download PDFInfo
- Publication number
- EP0959145B1 EP0959145B1 EP99109130A EP99109130A EP0959145B1 EP 0959145 B1 EP0959145 B1 EP 0959145B1 EP 99109130 A EP99109130 A EP 99109130A EP 99109130 A EP99109130 A EP 99109130A EP 0959145 B1 EP0959145 B1 EP 0959145B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- zone
- annealing
- maintaining
- strip
- 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.)
- Expired - Lifetime
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
Definitions
- the invention relates to a method and an apparatus for Execution of the annealing of a galvannealing process, at the strips and sheets, especially of steel, after a Hot galvanizing are subjected to annealing Heating the coated material with the following Keep at glowing end temperature.
- the coating of the coated tape treated in this way exists only from iron-zinc compounds with approx. 10-12% Fe.
- the annealing of a galvannealing process goes a conventional one Hot-dip galvanizing process ahead.
- the Steel surface cleaned first.
- one recrystallizing annealing of the hard-rolled input material performed in an oven under a protective gas atmosphere.
- the strip is then cooled to the galvanizing temperature and hot-dip galvanized using an aluminum-containing zinc melt. Finally, the excess zinc melt stripped with air or nitrogen.
- Such a galvannealing process is known from JP-08-165550 A. This describes a hot dip galvanizing process with two warming up steps during the Subsequent annealing treatment to a zinc galvanized sheet to improve that the plating layers when the Do not lift off the sheet (so-called "flaking").
- phase structure set for this annealing is for Quality of the coating as well as the usability of the galvannealing-treated Base material crucial, for example during the later deep-drawing process in the press shop.
- This galvannealing furnace is used in conventional systems consisting of two zones: on the one hand, the zone for inductive heating of the tape and on the other hand the adjoining zone to keep at the desired final temperature.
- the stop zone is usually via resistance-heated or gas-fired Heated parts.
- the phase structure of the coating material is special depending on the parameters temperature and time. These important Parameters can be determined by the system parameters, the strip infeed temperature in the zinc smelt, the temperature of the Zinc melt, the aluminum concentration in the zinc melt and the thickness of the coating can be influenced. The most essential The influencing variable is the base material, i.e. the alloy composition of the steel and its condition.
- Galvannealing-treated sheet is mainly found in the Automotive industry use and is characterized by good Weldability and paintability.
- IF steels are steels that are not interstitial in the iron grid have dissolved atoms.
- the C and N atoms are through selectively added carbonitride formers (Ti, Nb, V).
- IF steels have no noteworthy levels strength-increasing elements such as P, Mn or B.
- the Element Si can improve the adhesion of the Galvanealed coating can be added (up to approx. 0.10%).
- the two steel groups, IF steels and higher strength steels, have, however, in relation to the applied zinc coating a clearly different alloy behavior, especially with regard to their speed. in this connection Alloy formation in the high-strength steels runs significantly slower than with the IF steels.
- the present invention is therefore based on the object a method and an apparatus for the annealing of a galvannealing process to propose the sheets and strips different base materials, in particular high-strength steels without being subjected to performance losses can
- the core of the invention is the adaptation of the glow cycle with regard to the parameters of temperature and time for the base materials, here in particular high-strength steels, to be taken into account the material-specific progress of the alloy.
- the proposed process engineering in the form of a gradual Annealing treatment is an opportunity for controlled adjustment the properties between base material and coating material as well as the covering material itself.
- This annealing treatment should advantageously be carried out in this way be that the heating process with subsequent hold on Final temperature by a second holding process at one temperature interrupted below the final temperature.
- this be a zone for inductive Heating the belt and another zone for Maintaining the tape at the warm-up temperature includes between the zone for inductive heating of the strip and the End stop zone at least one further stop zone is provided is.
- the proposed procedure of the gradual Annealing treatment in a galvannealing process as well as the proposed one The structure of the annealing furnace shows the following advantages:
- the annealing parameters are the alloy sequence of the combination Steel / coating material adapted. This is not the point overheating in the coating material without a Alloy formation occurs. Furthermore, one becomes possible counteracted increased evaporation of zinc. This is a major advantage for both the operation of the Galvannealed furnace as well as for the morphology of the Galvannealed coating.
- the method according to the invention means and the proposed furnace no loss in performance of the hot-dip galvanizing plant.
- FIG 1 shows schematically the structure of the invention Galvannealing furnace variant with interrupted heating zone.
- the galvanealing furnace 1 comprises a first zone 2a for inductive heating. This is followed by a holding zone 3a on. After this holding zone 3a, the belt is passed through again led a heating zone 2b. Then in one second holding zone 3b the coated strip to the final temperature held.
- Figure 3 shows an example of such Step-by-step heating curve resulting from furnace build-up (Curve course c).
- the line speed is here 90m / min.
- the belt runs at an initial temperature of 420 ° C in the oven and will quickly open in a first stage Heated to 470 ° C.
- the belt then runs into the first holding zone (3a) and is kept at the intermediate temperature for about 7s. Then another heating process takes place on the Final glowing temperature of 520 ° C instead.
- FIGS. 2a and b schematically show the structure of conventional ones Galvannealing ovens shown. Both variants exist from a first zone for inductive heating 2 as well a second, adjoining zone 3, for holding the Band to final temperature.
- Known systems with inductive Band heating have either in the inductive heating section 2 several induction coils 2a, b, c, d, usually 4-7 coils, on ( Figure 2a) or include only a single induction coil 2 ( Figure 2b).
- This single coil 2 has the same installed capacity as the previous several Coils together. The difference is in the essential smaller band area in the inductor, which makes the specific Performance or power density is significantly increased, what manifests itself in a higher heating rate.
- FIG. 3 The temperature-time profiles of the annealing treatments after Oven variants of FIGS. 2a and b are also shown in FIG. 3 shown.
- the furnace according to the invention quickly reached the final glowing temperature. This is convenient for IF steels, the alloying point of which is already shorter Time is reached.
- the alloying point also becomes due to higher alloy contents in the steel only after prolonged glow reached.
- To overheat the coating to avoid and a controlled alloy process between base material and coating material as well as in Setting the coating material yourself will be a Intermediate annealing introduced with subsequent heating up Glowing temperature. Furthermore, one is hereby possible Evaporation of zinc counteracted in the galvannealing furnace.
Landscapes
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Laser Beam Processing (AREA)
- Magnetic Heads (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Tunnel Furnaces (AREA)
Description
- Figur 1
- schematisch den Aufbau einer Ausführungsform des erfindungsgemäßen Ofenaufbaus zur Durchführung einer Glühung während eines Galvannealing-Prozesses;
- Figuren 2a und b
- schematisch den Aufbau von herkömmlichen Öfen zur Durchführung einer Glühung während eines Galvannealing-Prozesses;
- Figur 3
- den Bandtemperaturverlauf über der Zeit bei den verschiedenen Galvannealing-Ofenvarianten nach Figur 1 und Figuren 2a und b.
Claims (6)
- Verfahren zur Durchführung der Glühung eines Galvannealing-Prozesses, bei dem Bänder und Bleche aus Stahl nach einem Feuerverzinken einer Glühung unterzogen werden durch stufenweises Aufheizen des beschichteten Materials mit nachfolgendem Halten auf Glühendtemperatur,
dadurch gekennzeichnet, daß zur Behandlung von Stählen unterschiedlicher Legierungszusammensetzungen, die im Verhältnis zum aufgebrachten Zinküberzug ein unterschiedliches Legierungsverhalten zeigen, während der Glühung die Aufheizschritte von mindestens einem weiteren Halteschritt unterbrochen werden,
wobei das feuerverzinkte Band oder Blech aus Stahl in einem ersten Aufheizschritt schnell erhitzt wird und danach in eine erste Haltezone zur Durchführung eines Halteschritts mit einer im Verhältnis zu dem Aufheizschritt längeren Dauer einläuft und anschließend einem zweiten schnellen Aufheizschritt unterworfen wird,
wobei die Beheizung während der Aufheizschritte induktiv und die Beheizung während der jeweiligen Halteschritte mittels Widerstands- oder Gasbeheizung erfolgt. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß der Aufheizvorgang mit anschließendem Halten auf Endtemperatur durch eine Haltestufe auf einer Temperatur unterhalb der Endtemperatur unterbrochen wird. - Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses nach Anspruch 1,
bei dem Bänder und Bleche aus Stahl nach einem Feuerverzinken einer Glühung unterzogen werden durch stufenweises Aufheizen des beschichteten Materials mit nachfolgendem Halten auf Glühendtemperatur,
umfassend eine Zone zum induktiven Aufheizen des Bandes oder Bleches aus Stahl sowie eine weitere Zone zum Halten des Bandes oder Bleches auf Endtemperatur,
dadurch gekennzeichnet, daß die Zone zum induktiven Aufheizen des Bandes (2a, 2b) von mindestens einer weiteren Haltezone (3a) unterbrochen ist,
mit einer ersten Aufheizzone (2a) zum schnellen Erhitzen des feuerverzinkten Bandes oder Blechs aus Stahl,
mit einer sich anschließenden Haltezone zur Durchführung eines Halteschritts mit einer im Verhältnis zu dem Aufheizschritt längeren Dauer und
mit einer zweiten Aufheizzone (2b) zum schnellen Erhitzen des Bandes oder Blechs,
wobei die Aufheizzonen (2a, 2b) induktiv beheizt sind und
wobei die jeweilige Haltezonen (3a) widerstands- oder gasbeheizt ist. - Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet, daß eine erste Induktionszone (2a) mit nachfolgender erster Haltezone (3a) sowie eine zweite sich daran anschließende Induktionszone (2b) mit nachfolgender zweiter Haltezone (3b) vorgesehen sind. - Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß die Zonen zum induktiven Aufheizen (2a, 2b) aus mehreren Induktionsspulen bestehen. - Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß die Zonen zum induktiven Aufheizen (2a, 2b) aus einer Induktionsspule besteht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19822156 | 1998-05-16 | ||
DE19822156A DE19822156A1 (de) | 1998-05-16 | 1998-05-16 | Verfahren und Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0959145A1 EP0959145A1 (de) | 1999-11-24 |
EP0959145B1 true EP0959145B1 (de) | 2003-01-15 |
Family
ID=7868091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99109130A Expired - Lifetime EP0959145B1 (de) | 1998-05-16 | 1999-05-08 | Verfahren und Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses |
Country Status (7)
Country | Link |
---|---|
US (1) | US6379481B2 (de) |
EP (1) | EP0959145B1 (de) |
JP (1) | JP2000026948A (de) |
AT (1) | ATE231191T1 (de) |
CA (1) | CA2271816A1 (de) |
DE (2) | DE19822156A1 (de) |
ES (1) | ES2192356T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10023312C1 (de) * | 2000-05-15 | 2001-08-23 | Thyssenkrupp Stahl Ag | Galvannealed-Feinblech und Verfahren zum Herstellen von derartigem Feinblech |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3058840A (en) * | 1959-04-16 | 1962-10-16 | Electric Furnace Co | Induction strip heating apparatus |
US3307968A (en) * | 1963-09-03 | 1967-03-07 | Armco Steel Corp | Method and apparatus for controlling the alloying of zinc coatings |
US3398252A (en) * | 1965-11-15 | 1968-08-20 | Westinghouse Electric Corp | Heat treatment apparatus |
JPS5263123A (en) * | 1975-11-19 | 1977-05-25 | Toyo Kogyo Co | Production method of reactor material having excellent deformation resistance |
US4287008A (en) * | 1979-11-08 | 1981-09-01 | Bethlehem Steel Corporation | Method of improving the ductility of the coating of an aluminum-zinc alloy coated ferrous product |
JPS5834167A (ja) * | 1981-08-25 | 1983-02-28 | Nippon Kokan Kk <Nkk> | 溶融亜鉛メツキ鋼板のFe−Zn合金化処理方法 |
JPS5834168A (ja) * | 1981-08-25 | 1983-02-28 | Nippon Kokan Kk <Nkk> | 溶融亜鉛メツキ鋼板のFe−Zn合金化処理方法 |
FR2546534B1 (fr) * | 1983-05-24 | 1989-04-21 | Usinor | Procede et installation de fabrication en continu d'une bande d'acier survieillie portant un revetement de zn, al ou d'alliage zn-al |
JP2658580B2 (ja) * | 1990-12-29 | 1997-09-30 | 日本鋼管株式会社 | プレス成形性および耐パウダリング性の優れた合金化溶融亜鉛めっき鋼板の製造方法 |
JP2707952B2 (ja) * | 1993-07-19 | 1998-02-04 | 住友金属工業株式会社 | 界面密着性に優れた合金化溶融Znめっき鋼板およびその製造方法 |
BE1007793A6 (fr) * | 1993-12-24 | 1995-10-24 | Centre Rech Metallurgique | Procede et installation de traitement continu d'une bande d'acier galvanisee. |
JPH08165550A (ja) * | 1994-12-13 | 1996-06-25 | Nippon Steel Corp | 耐フレーキング性に優れた合金化溶融亜鉛めっき鋼板の製造方法 |
EP0823490B1 (de) * | 1996-02-22 | 2003-07-30 | Sumitomo Metal Industries, Ltd. | Geglühtes stahlblech und verfahren zu dessen herstellung |
-
1998
- 1998-05-16 DE DE19822156A patent/DE19822156A1/de not_active Withdrawn
-
1999
- 1999-05-08 EP EP99109130A patent/EP0959145B1/de not_active Expired - Lifetime
- 1999-05-08 DE DE59904014T patent/DE59904014D1/de not_active Expired - Fee Related
- 1999-05-08 AT AT99109130T patent/ATE231191T1/de not_active IP Right Cessation
- 1999-05-08 ES ES99109130T patent/ES2192356T3/es not_active Expired - Lifetime
- 1999-05-11 CA CA002271816A patent/CA2271816A1/en not_active Abandoned
- 1999-05-12 US US09/310,831 patent/US6379481B2/en not_active Expired - Fee Related
- 1999-05-13 JP JP11132828A patent/JP2000026948A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE19822156A1 (de) | 1999-11-18 |
US20010035240A1 (en) | 2001-11-01 |
JP2000026948A (ja) | 2000-01-25 |
US6379481B2 (en) | 2002-04-30 |
ES2192356T3 (es) | 2003-10-01 |
CA2271816A1 (en) | 1999-11-16 |
ATE231191T1 (de) | 2003-02-15 |
DE59904014D1 (de) | 2003-02-20 |
EP0959145A1 (de) | 1999-11-24 |
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