EP0166654A1 - Verfahren und Vorrichtung zur Verkleinerung des Blühens von galvanisierten Stahlblechen - Google Patents

Verfahren und Vorrichtung zur Verkleinerung des Blühens von galvanisierten Stahlblechen Download PDF

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Publication number
EP0166654A1
EP0166654A1 EP85401193A EP85401193A EP0166654A1 EP 0166654 A1 EP0166654 A1 EP 0166654A1 EP 85401193 A EP85401193 A EP 85401193A EP 85401193 A EP85401193 A EP 85401193A EP 0166654 A1 EP0166654 A1 EP 0166654A1
Authority
EP
European Patent Office
Prior art keywords
box
strip
zinc
temperature
spray
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
EP85401193A
Other languages
English (en)
French (fr)
Other versions
EP0166654B1 (de
Inventor
Bernard Francois
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.)
USINOR SA
Original Assignee
USINOR SA
Union Siderurgique du Nord et de lEst de France SA USINOR
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 USINOR SA, Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical USINOR SA
Priority to AT85401193T priority Critical patent/ATE30602T1/de
Publication of EP0166654A1 publication Critical patent/EP0166654A1/de
Application granted granted Critical
Publication of EP0166654B1 publication Critical patent/EP0166654B1/de
Expired 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/265—After-treatment by applying solid particles to the molten coating

Definitions

  • the present invention relates to a method and an optimization device in a method for reducing the dimension of the flowering of a strip of galvanized steel.
  • the steel strip After having undergone a heat treatment, is immersed in a bath of molten zinc.
  • the layer of liquid zinc is then wrung out either by rollers on the low production lines or more generally by the effect of pressure of air or gas jets on the high production lines, then it freezes under the effect of the natural cooling of the ambient air.
  • the flowering of the galvanized strips is prohibited in particular in certain applications where the sheet is painted because the weft of the flowers reappears through the layer of paint.
  • the germs consist of zinc in fine powder which is transported by air.
  • the average particle size is generally around 5 g.
  • the coating freezes inside the box, in the presence of the germs of crystallization transported in the air coming from the blowing slots.
  • this is a pre-cooling box and / or more generally a height adjustment of the box.
  • the height adjustment of the box can be effective if the latitude of the adjustment covers the entire production of the line. On the other hand, it is a manual adjustment which cannot have the reliability of an automatic adjustment.
  • the present invention aims to improve the "mini-flowering" process by regulating the temperature of the galvanized steel strip.
  • the subject of the present invention is a method for optimizing the solidification of zinc on a steel strip under the action of germs of crystallization, constituted by zinc in fine powder, which are projected by a transport fluid to the inside of a spray box on both sides of the strip, characterized in that the temperature of the strip at the outlet of the box is measured and this temperature is maintained at an optimum value by regulating the flow of fluid transport in the box depending on the difference between the temperature measurement obtained and the optimal temperature.
  • an increase in temperature of the strip will cause an increase in the flow rate of transport fluid and a decrease in temperature will cause a decrease in this flow rate.
  • the transport fluid is suitably air, but can be any inert gas.
  • the temperature displayed may be a few degrees higher than the solidification temperature of zinc (419 ° C).
  • maintaining the temperature at an optimal value is also obtained by subjecting the strip upstream of the spray box to precooling by a cooling fluid controlled by the temperature measurement. performed at the outlet of the box.
  • FIG. 1 The installation shown in FIG. 1 comprises a box 1 comprising two identical half-boxes 1a and 1b arranged vertically between which a strip 2 of galvanized steel runs vertically.
  • the strip 2 of galvanized steel enters the lower part of the casing 1, while the zinc which covers it is still in the molten state.
  • Each half-box 1a and 1b has in its center a blowing slot 3a, 3b horizontal and at its lower and upper ends a return slot respectively 4a, 4b and 5a, 5b by which the non-fixed zinc powder is re-aspirated.
  • a recirculation fan 7 feeds through a duct 8 on which is placed a flow regulating member 17 the blowing slots 3a, 3b, its suction being connected by a duct 9 to the return slots 4a, 4b and 5a, 5b.
  • perforated walls 6a, 6b are interposed in each part of the box between the slots and the connection to the conduits 8 and 9.
  • Fine zinc powder (with an average particle size of 5 ⁇ ) is fed continuously into the suction of the fan 7 from a storage hopper 10 through a device 11 for dosing powder.
  • the outlet of the box (at the top) is provided with suction hoods 12a, 12b whose function is to suck up the residual zinc powder which has not been captured by the recovery slots 5a, 5b, these hoods 12a , 12b being connected to the intake of a fan 13 via a duct 14.
  • a filter 15 is arranged at the outlet of the fan 13.
  • an apparatus 16 for optical measurement of the temperature of the strip which delivers a signal.
  • This device is in particular of the radiation pyrometer type.
  • the signal obtained is sent to a regulating device 18 which compares it to a reference value or setpoint C representing the optimal temperature value.
  • the regulator output signal is then used as will be described below.
  • This regulation device is in particular of the derivative integral proportional type.
  • the installation comprises, upstream of the spraying box 1, a precooling box 20 which itself consists of two half-boxes 20a and 20b arranged vertically on either side of the steel strip 2 between which it passes.
  • Each half-box 20a and 20b comprises a perforated plate 27a and 27b ensuring regular blowing of air onto the coated steel strip 2 in order to ensure pre-cooling.
  • a precooling fan 21 feeds through a duct 22, on which is installed a flow adjustment member 24, the parts 20a and 20b of the box 20.
  • the output signal of the regulator 18 is sent by a line 19 to the control members 23 and 25 respectively of the flow control members 17 and 24 of the air sent into the spray box 1 and the precooling box 20.
  • the control members 23 and 25 are of the current (or voltage) divider type commonly called "ratio-bias", delivering a proportional signal below or above a certain threshold.
  • the regulator 18 On a decrease in temperature detected by the pyrometer 16, the regulator 18 will deliver a new signal which, processed in the "ratio-bias" 23 and 25 will firstly control the closure member 24 for adjusting the pre-cooling air flow and then , the latter being completely closed, will close the adjusting member 17 of the recirculation air flow.
  • the "ratio-bias" 23 and 25 can be adjusted so that there is slight overlap between the maximum opening of the regulating member 17 of the air flow of recirculation and the minimum opening of the regulating member 24 of the pre-cooling air flow.
  • the cascade or "split-range" operating diagram of the air flow adjustment members 17 and 24 is shown in FIG. 2.
  • the control member 23 also controls the powder metering device 11 by a line 28 by varying the speed of rotation of the motor 29 driving this device 11 as a function of the opening of the adjusting member 17 of air flow.
  • the spray box is provided with means for displacement in vertical translation along the strip 2 which are controlled by an operator as a function of the output signal from the regulator 18.
  • a threshold comparator 26 is installed in bypass on the output signal of the regulator 18. It will be adjusted so that, when this signal arrives above a value approximately equal to 90% (M), an alarm warns the he operator must raise the casing 1 and, conversely when the signal drops below a value close to 45% (B), another alarm indicates to the operator that he must lower the casing.
  • the height adjustment of the spray box 1 can be made fully automatic using the threshold comparator 26 and the alarms described above.
  • an electrical relay system will control movements in stages.
  • the “ascend” alarm will automatically control a rise, for example of one meter in the spray box 1. This operation will be repeated a few moments later if the “ascend” alarm persists.
  • the "lower” alarm will automatically control a descent, for example, of one meter from the spray box 1, an operation which will be repeated a few moments later if the "lower” alarm persists.

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)
  • Electroplating And Plating Baths Therefor (AREA)
EP85401193A 1984-06-22 1985-06-14 Verfahren und Vorrichtung zur Verkleinerung des Blühens von galvanisierten Stahlblechen Expired EP0166654B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401193T ATE30602T1 (de) 1984-06-22 1985-06-14 Verfahren und vorrichtung zur verkleinerung des bluehens von galvanisierten stahlblechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8409910A FR2566432A1 (fr) 1984-06-22 1984-06-22 Procede et dispositif d'optimisation dans un procede de reduction de la dimension du fleurage d'une bande d'acier galvanise
FR8409910 1984-06-22

Publications (2)

Publication Number Publication Date
EP0166654A1 true EP0166654A1 (de) 1986-01-02
EP0166654B1 EP0166654B1 (de) 1987-11-04

Family

ID=9305355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401193A Expired EP0166654B1 (de) 1984-06-22 1985-06-14 Verfahren und Vorrichtung zur Verkleinerung des Blühens von galvanisierten Stahlblechen

Country Status (10)

Country Link
US (1) US4619835A (de)
EP (1) EP0166654B1 (de)
JP (1) JPS6115956A (de)
KR (1) KR920007846B1 (de)
AT (1) ATE30602T1 (de)
AU (1) AU579376B2 (de)
CA (1) CA1225548A (de)
DE (1) DE3560909D1 (de)
ES (1) ES8701852A1 (de)
FR (1) FR2566432A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208442A (ja) * 1988-02-16 1989-08-22 Sumitomo Metal Ind Ltd ゼロスパングル亜鉛メッキ鋼板の製造方法
JPH01306547A (ja) * 1988-06-06 1989-12-11 Nkk Corp 溶融亜鉛メッキスパングルの制御方法
JPH02125852A (ja) * 1988-11-07 1990-05-14 Nippon Steel Corp ハーティプロセス装置
DE4008738C1 (en) * 1989-06-07 1990-11-08 Hoesch Stahl Ag, 4600 Dortmund, De Improving surface quality of steel strip or sheet - by coating with aluminium zinc alloy including silicon
FR2678645B1 (fr) * 1991-07-01 1993-10-29 Sollac Procede de regulation d'un traitement metallurgique effectue sur un produit en defilement et dispositif pour sa mise en óoeuvre.
CN111841947B (zh) * 2020-07-24 2021-07-30 南京江宁区上峰国银标准件厂 一种金属方管表面喷漆防腐装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1440367A (fr) * 1965-07-05 1966-05-27 Armco Steel Corp Procédé pour le traitement de feuillards ou bandes métalliques fraîchement galvanisés en vue de réduire le degré de pailletage visible et appareil pour la mise en oeuvre dudit procédé
FR2236013A1 (en) * 1973-07-06 1975-01-31 Heurtey Metallurgie Treating galvanised coatings on sheet metal - to give semi- brilliant appearance by seeding molten coating with powdered material
DE2755585A1 (de) * 1977-10-14 1979-04-19 Kloeckner Humboldt Deutz Ag Vorrichtung zum auftragen oberflaechenhaertender schichten auf die wendeln von foerderschnecken
FR2440998A1 (fr) * 1978-11-09 1980-06-06 Strasbourg Laminoirs Procede et dispositif pour la fabrication de tole ou de feuillard galvanise a revetement pauvre sur une face

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379557A (en) * 1964-07-06 1968-04-23 Armco Steel Corp Suppression of visible spangle
FR1446335A (fr) * 1965-04-09 1966-07-22 Strasbourg Forges Perfectionnements apportés à la fabrication de produits et notamment de tôles galvanisées à chaud
FR2544336B1 (fr) * 1983-04-13 1985-08-09 Ziegler Sa Installation pour le revetement en continu de bande, notamment pour la galvanisation de tole d'acier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1440367A (fr) * 1965-07-05 1966-05-27 Armco Steel Corp Procédé pour le traitement de feuillards ou bandes métalliques fraîchement galvanisés en vue de réduire le degré de pailletage visible et appareil pour la mise en oeuvre dudit procédé
FR2236013A1 (en) * 1973-07-06 1975-01-31 Heurtey Metallurgie Treating galvanised coatings on sheet metal - to give semi- brilliant appearance by seeding molten coating with powdered material
DE2755585A1 (de) * 1977-10-14 1979-04-19 Kloeckner Humboldt Deutz Ag Vorrichtung zum auftragen oberflaechenhaertender schichten auf die wendeln von foerderschnecken
FR2440998A1 (fr) * 1978-11-09 1980-06-06 Strasbourg Laminoirs Procede et dispositif pour la fabrication de tole ou de feuillard galvanise a revetement pauvre sur une face

Also Published As

Publication number Publication date
JPS6115956A (ja) 1986-01-24
ES8701852A1 (es) 1986-12-16
ATE30602T1 (de) 1987-11-15
FR2566432A1 (fr) 1985-12-27
AU4378385A (en) 1986-01-02
CA1225548A (en) 1987-08-18
DE3560909D1 (en) 1987-12-10
US4619835A (en) 1986-10-28
KR920007846B1 (ko) 1992-09-18
AU579376B2 (en) 1988-11-24
EP0166654B1 (de) 1987-11-04
KR860000404A (ko) 1986-01-28
ES544780A0 (es) 1986-12-16

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