EP0834591A1 - Verfahren und Vorrichtung zum Verzinken von Stahlband - Google Patents

Verfahren und Vorrichtung zum Verzinken von Stahlband Download PDF

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Publication number
EP0834591A1
EP0834591A1 EP97870147A EP97870147A EP0834591A1 EP 0834591 A1 EP0834591 A1 EP 0834591A1 EP 97870147 A EP97870147 A EP 97870147A EP 97870147 A EP97870147 A EP 97870147A EP 0834591 A1 EP0834591 A1 EP 0834591A1
Authority
EP
European Patent Office
Prior art keywords
bath
sheath
metal
temperature
duct
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
Application number
EP97870147A
Other languages
English (en)
French (fr)
Other versions
EP0834591B1 (de
Inventor
Michel Dubois
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre SA
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.)
Filing date
Publication date
Application filed by Cockerill Sambre SA filed Critical Cockerill Sambre SA
Publication of EP0834591A1 publication Critical patent/EP0834591A1/de
Application granted granted Critical
Publication of EP0834591B1 publication Critical patent/EP0834591B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/522—Temperature of the bath

Definitions

  • the present invention relates to a method of coating of steel sheets by immersion in a liquid metal in which the sheets pass through continues, an annealing oven and descend into the bath liquid metal through a metallic sheath extending between the oven and the bath and whose lower end plunges into the bath.
  • the invention also relates to a device for implementing this method.
  • intermetals in question have a size ranging from 2 to 50 microns and are made up of iron and alloy metals. These are in particular the delta phase (FeZn) and Fe 2 Al 5-x Z x in galvanization, Fe 5 Al 20 Si 2 in aluzinc, Fe 2 Al 9 Si 2 in aluminized with silicon and FeAl 3 in Galfan and pure aluminized.
  • the heating power therefore remains significant same as power consumption.
  • Document JP 08 176773 A (SUMITOMO METAL IND LTD), describes a device for controlling the temperature relating to the condensation of vapors in the submerged tube.
  • the object of the present invention is to provide a new method and device for reducing significantly the formation of these defects.
  • the process according to present invention is characterized in that one heats the sheath, in a controlled manner, so that its temperature of skin, at the level of the mooring line, and in particular inside, be kept at a temperature roughly corresponding to that of the metal bath.
  • the temperature of the sheath and, in particular, of his skin, side exposed to the sheet is advantageously controlled in an area between 3 cm above and 3 cm below the mooring line so that t - 30 ° C ⁇ T ⁇ t + 50 ° C, where t is the bath temperature and T the temperature of the sheath.
  • the invention also provides a device for coating of steel sheets by immersion in a bath of liquid metal comprising a tank containing the metal liquid, a metallic sheath whose lower end plunges into the metal bath and means to guide the sheet metal through the sheath in the metal bath, characterized in that the sheath comprises, at least at the level of the bath surface, a double wall inside which there is a thermal loss compensation system, for example a heating system placed under control a device for regulating the skin temperature of the inner surface of the sheath.
  • a thermal loss compensation system for example a heating system placed under control a device for regulating the skin temperature of the inner surface of the sheath.
  • the heating system can consist of electrical resistors while the regulation system may consist of thermocouples.
  • This heating system can, moreover, be associated with a thermal insulation system of the sheath.
  • the invention is based on observations and measures relating to the formation of these faults and essentially consists in eliminating parameters and conditions favorable to the formation of defaults.
  • the sheath Under normal industrial conditions, the sheath is subject to variations in thermal regimes as a result of inevitable variations in the level of bath surface, either by waves or by adding fresh metal (liquid or solid).
  • the line of anchorage When, the line of anchorage is displaced, for example following a rise in the bath level, the temperature profile at this point is amended. In particular, cooler areas can be brought back to bath temperature. He was noticed that these conditions are favorable for dropping out of previously crystallized particles.
  • the mechanism exact chemical is not known but could, for example, result from a partial solution or a transformation of the chemical composition. If, moreover, the particle thus detached is of lower density than the bath, it floats and can be attracted, trained and fixed on the sheet scrolling in its vicinity and thus create the appearance defects.
  • the attached figure shows schematically, at illustrative title, an example of an embodiment of a device according to the present invention.
  • the figure shows a sheet metal strip 2 in from an annealing oven not shown entering a liquid metal bath 4 for coating thereon, by example by galvanizing. Between the oven and the bath 4, the sheet metal passes through a closed sheath 6 of which only the lower part which plunges into the metal bath 4.
  • the sheath 6 includes, at least in the part that plunges into the bath 4, a double wall 8 between which is a system for heating, for example electric resistors 10 placed under the control of a regulation system including a skin temperature measurement, for example a thermocouple 12.
  • a system for heating for example electric resistors 10 placed under the control of a regulation system including a skin temperature measurement, for example a thermocouple 12.
  • Resistors 10 and the regulation system are designed to ensure, permanently, in the area between 3 cm above and 3 cm below the level of bath 4 and in particular at the level of the line of wetting, a skin temperature inside the sheath 6 which is in the range between t - 30 ° C and t + 50 ° C, t being the temperature of the metal bath 4.
  • Heating and thermal insulation of the duct 6 can advantageously complement each other without their association is compulsory, thermal insulation can be carried out by conventional insulators or by ceramic coatings.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP97870147A 1996-10-07 1997-09-30 Vorrichtung und Verfahren zum Verzinken von Stahlband Expired - Lifetime EP0834591B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9600837A BE1010666A3 (fr) 1996-10-07 1996-10-07 Procede et dispositif de revetement de toles d'acier par immersion.
BE9600837 1996-10-07

Publications (2)

Publication Number Publication Date
EP0834591A1 true EP0834591A1 (de) 1998-04-08
EP0834591B1 EP0834591B1 (de) 2000-11-08

Family

ID=3890015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97870147A Expired - Lifetime EP0834591B1 (de) 1996-10-07 1997-09-30 Vorrichtung und Verfahren zum Verzinken von Stahlband

Country Status (6)

Country Link
EP (1) EP0834591B1 (de)
AT (1) ATE197482T1 (de)
BE (1) BE1010666A3 (de)
DE (1) DE69703475T2 (de)
ES (1) ES2152077T3 (de)
PT (1) PT834591E (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63111162A (ja) * 1986-10-29 1988-05-16 Sumitomo Metal Ind Ltd 連続溶融メツキ方法
JPH04329856A (ja) * 1991-04-26 1992-11-18 Nkk Corp 鋼帯の連続溶融亜鉛鍍金における溶融亜鉛浴への浸入板温制御方法
JPH08176773A (ja) * 1994-12-28 1996-07-09 Sumitomo Metal Ind Ltd 連続溶融めっきのスナウト内フューム付着防止法および装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6513832A (de) * 1964-10-28 1966-04-29
US3479210A (en) * 1968-12-04 1969-11-18 Nat Steel Corp Method and apparatus for controlling coating metal temperature in a hot-dip coating bath
JPH0635646B2 (ja) * 1985-04-22 1994-05-11 大同特殊鋼株式会社 亜鉛・アルミ合金メツキ装置
JPS62177164A (ja) * 1986-01-30 1987-08-04 Daido Steel Co Ltd 連続式合金メツキ装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63111162A (ja) * 1986-10-29 1988-05-16 Sumitomo Metal Ind Ltd 連続溶融メツキ方法
JPH04329856A (ja) * 1991-04-26 1992-11-18 Nkk Corp 鋼帯の連続溶融亜鉛鍍金における溶融亜鉛浴への浸入板温制御方法
JPH08176773A (ja) * 1994-12-28 1996-07-09 Sumitomo Metal Ind Ltd 連続溶融めっきのスナウト内フューム付着防止法および装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 353 (C - 530) 21 September 1988 (1988-09-21) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 171 (C - 1044) 2 April 1993 (1993-04-02) *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 011 29 November 1996 (1996-11-29) *

Also Published As

Publication number Publication date
DE69703475D1 (de) 2000-12-14
ES2152077T3 (es) 2001-01-16
PT834591E (pt) 2001-03-30
EP0834591B1 (de) 2000-11-08
BE1010666A3 (fr) 1998-11-03
DE69703475T2 (de) 2001-03-15
ATE197482T1 (de) 2000-11-11

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