EP3382054A1 - Beschichtetes metallblech, verfahren zur bereitstellung solch eines beschichtetes metallblechs und feuerverzinkungsvorrichtung zur herstellung solch eines beschichtetes metallblechs - Google Patents

Beschichtetes metallblech, verfahren zur bereitstellung solch eines beschichtetes metallblechs und feuerverzinkungsvorrichtung zur herstellung solch eines beschichtetes metallblechs Download PDF

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Publication number
EP3382054A1
EP3382054A1 EP17163994.1A EP17163994A EP3382054A1 EP 3382054 A1 EP3382054 A1 EP 3382054A1 EP 17163994 A EP17163994 A EP 17163994A EP 3382054 A1 EP3382054 A1 EP 3382054A1
Authority
EP
European Patent Office
Prior art keywords
less
metal sheet
equal
value
depth
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Withdrawn
Application number
EP17163994.1A
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English (en)
French (fr)
Inventor
Hendrik Bart Van Veldhuizen
Edgar Matthijs TOOSE
Henrique DUARTE ALVARENGA
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.)
Tata Steel Ijmuiden BV
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Tata Steel Ijmuiden BV
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.)
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Publication date
Application filed by Tata Steel Ijmuiden BV filed Critical Tata Steel Ijmuiden BV
Priority to EP17163994.1A priority Critical patent/EP3382054A1/de
Publication of EP3382054A1 publication Critical patent/EP3382054A1/de
Withdrawn legal-status Critical Current

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    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching

Definitions

  • the invention relates primarily to a method of providing a coating on a metal sheet, wherein a cold rolled metal sheet is subjected to a hot dip galvanizing operation to provide a metal coating on the metal sheet, which hot dip galvanizing operation comprises guiding the metal sheet through a liquid bath of the metal coating with at least one stabilization roll provided at a predefined depth below surface level of the liquid bath, and wiping the metal coating that is provided on the metal sheet with at least one gas knife having an outlet to project wiping gas on the metal coating that is provided on the metal sheet that passes along the gas knife.
  • Such a method of providing a coating on a metal sheet is widely known throughout the iron and steel industry; an exemplary publication showing such a method is GB 2517622 .
  • a problem also acknowledged in GB 2517622 is the waviness of the coated metal sheet, which causes that after providing the coated metal sheet with a film of paint its outer appearance can be less than optimal.
  • One known problem is the appearance of orange skin which is particularly undesirable for outside body parts of automobiles.
  • GB 2517622 does not particularly provide a workable solution for this problem, for one thing since its disclosure is obscure in relation to the waviness measure it applies.
  • the invention proposes a method to manufacture a coated metal sheet, such a coated metal sheet, a hot dip galvanizing device and its combination with a cold rolling mill in accordance with one or more of the appended claims.
  • ' ⁇ ' symbolizes "less than or equal”.
  • the at least one stabilization roll is provided at a depth below surface level of the liquid bath of equal or less than a value of 150 mm, preferably at a value equal or less than 140 mm, more preferably at a value equal or less than 130 mm, most preferably at a value equal or less than 120 mm.
  • a coated metal sheet can effectively be provided with a maximum waviness value Wsa equal or less than 0.41; preferably less than 0.35; more preferably less than 0.31; more preferably less than 0.26; most preferably less than 0.23.
  • the invention is also embodied in a hot dip galvanizing device to provide a metal coating on a moving metal sheet, which according to the mentioned prior art comprises a liquid bath of metal coating to be provided on the metal sheet, wherein at least one stabilization roll is provided at a predefined depth below a surface level of the liquid bath to guide the moving metal sheet through the bath, wherein at least one gas knife is provided above the liquid bath, and wherein said gas knife has an outlet to project wiping gas such as air or nitrogen on the metal coating provided on the metal sheet that in use passes along the gas knife.
  • the at least one stabilization roll of the hot dip galvanizing device is provided at a depth below surface level of the liquid bath of equal or less than a value of 150 mm, preferably at a value equal or less than 140 mm, more preferably at a value equal or less than 130 mm, most preferably at a value equal or less than 120 mm.
  • the objects of the invention can be further promoted when the roughness Ra is set a value of equal or less than 1.5, preferably a value of 0.6 or less.
  • FIG 1 a typical flow of manufacturing steps is shown leading to a coated metal sheet according to the invention, as well as some sequential steps to convert the coated metal sheet of the invention into a press formed and painted automobile body part.
  • casting 1 of a metal slab is followed by hot rolling in a hot strip mill 2 to provide a metal strip, processing in a pickling line 3, cold rolling in a cold rolling mill 4, annealing in a continuous annealing line 5, providing a metal coating on the annealed strip in a hot dip galvanizing line 6 , temper rolling in a temper mill 7, shipping 8 of the product to customers, press forming 9 and painting 10.
  • Some of these operations can be dispensed with, while it is also possible that some other operations are added to this sequence of events. The skilled person further knows that many operations precede the casting step.
  • FIG 2 it shows a hot dip galvanizing device 11 to provide a metal coating on one surface 12 or both surfaces 12, 13 of a moving metal sheet 14, comprising a tank 15 that holds a liquid bath of the metal coating 16 that is to be provided on the moving metal sheet 14.
  • FIG. 2 shows the application of a stabilization roll 17 and a sink roll 21 to guide the moving metal sheet 14 through the bath, wherein the stabilization roll 17 is provided at a predefined depth ('Depth') below a surface level 18 of the liquid bath.
  • 'Depth' is defined as the distance between the surface level 18 of the liquid bath and an upper edge of the stabilization roll 17. It is remarked that the application of plural stabilization rolls is also possible, wherein then the 'Depth'-parameter relates to the uppermost stabilization roll.
  • FIG. 1 shows both the height H of the gas knife or knives 19 above the liquid bath with reference to its surface level 18, and the distance D of the shown two air knives 19 with reference to the metal sheet 14.
  • Table 1 shows the influence of the height H of the gas knife 19 above the liquid bath, and the influence of the distance D from sheet 14 to knife 19 in relation to the waviness Wsa of the coated metal sheet 14.
  • Table 2 shows the influence of the height H of the gas knife 19 above the liquid bath and the Depth of the at least one stabilizing roll 17 below the surface level 18 of the liquid bath.
  • Table 2 Height H D Depth -X- Wsa 550 8 120 88,77928 0,278 500 8 130 88,65714 0,28 550 8 130,3 89,43806 0,29 550 8 134,8 89,70968 0,29 505 8 140 89,32961 0,282 550 8 150 90,56443 0,311
  • Table 3 shows the influence of the roughness Ra of the last working rolls in the cold rolling mill in relation to X (the parameter D*In(H*Depth)) and their impact on the waviness of the product.
  • Table 3 Ra Wsa-meas. Height H D Depth -X- Wsa-calc 1,5 0,23 500 8 150 89,80195 0,242313 1,5 0,26 500 8 150 89,80195 0,242313 1,5 0,23 500 8 150 89,80195 0,242313 0,6 0,227 550 8 135 89,72154 0,225331 0,6 0,229 550 8 135 89,72154 0,225331 4,5 0,311 550 8 150 90,56443 0,306968 4,5 0,278 550 8 120 88,77928 0,277921 4,5 0,28 500 8 130 88,65714 0,275934 4,5 0,29 550 8 130,3 89,43806 0,28864 4,5 0,29 550 8 134,8 89,70968 0,
  • the at least one stabilization roll 17 is preferably provided at a depth D below surface level 18 of the liquid bath at a value of equal or less than 150 mm, preferably at a value equal or less than 140 mm, more preferably at a value equal or less than 130 mm, most preferably at a value equal or less than 120 mm.
  • Table 3 shows a calculation of the waviness Wsa which is depicted by the parameter Wsa-calc, whereas it also shows the measured waviness Wsa-meas.
  • the method of coating a metal sheet according to the invention results into a coated metal sheet with a waviness value Wsa equal or less than 0.41; preferably less than 0.35; more preferably less than 0.31; more preferably less than 0.26; most preferably less than 0.23.

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  • 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)
EP17163994.1A 2017-03-30 2017-03-30 Beschichtetes metallblech, verfahren zur bereitstellung solch eines beschichtetes metallblechs und feuerverzinkungsvorrichtung zur herstellung solch eines beschichtetes metallblechs Withdrawn EP3382054A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17163994.1A EP3382054A1 (de) 2017-03-30 2017-03-30 Beschichtetes metallblech, verfahren zur bereitstellung solch eines beschichtetes metallblechs und feuerverzinkungsvorrichtung zur herstellung solch eines beschichtetes metallblechs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17163994.1A EP3382054A1 (de) 2017-03-30 2017-03-30 Beschichtetes metallblech, verfahren zur bereitstellung solch eines beschichtetes metallblechs und feuerverzinkungsvorrichtung zur herstellung solch eines beschichtetes metallblechs

Publications (1)

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EP3382054A1 true EP3382054A1 (de) 2018-10-03

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EP17163994.1A Withdrawn EP3382054A1 (de) 2017-03-30 2017-03-30 Beschichtetes metallblech, verfahren zur bereitstellung solch eines beschichtetes metallblechs und feuerverzinkungsvorrichtung zur herstellung solch eines beschichtetes metallblechs

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020069734A1 (en) * 2018-10-02 2020-04-09 Tata Steel Ijmuiden B.V. Coated metal sheet, method to provide such a coated metal sheet, and hot dip galvanizing device to manufacture such a coated metal sheet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002658A1 (de) * 1992-07-16 1994-02-03 Duma Maschinen- Und Anlagenbau Beteiligungs Gmbh Beschichtungsvorrichtung
EP1327697A1 (de) * 2000-10-19 2003-07-16 Nkk Corporation Zinkbeschichtete stahlplatte und herstellungsverfahren dafür und verfahren zur herstllung von artikeln über pressen
GB2517622A (en) 2013-03-06 2015-02-25 Arcelormittal Investigacion Y Desarrollo Sl A method for manufacturing a metal sheet with a ZnAl coating and with optimised drying, corresponding metal sheet, part and vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002658A1 (de) * 1992-07-16 1994-02-03 Duma Maschinen- Und Anlagenbau Beteiligungs Gmbh Beschichtungsvorrichtung
EP1327697A1 (de) * 2000-10-19 2003-07-16 Nkk Corporation Zinkbeschichtete stahlplatte und herstellungsverfahren dafür und verfahren zur herstllung von artikeln über pressen
GB2517622A (en) 2013-03-06 2015-02-25 Arcelormittal Investigacion Y Desarrollo Sl A method for manufacturing a metal sheet with a ZnAl coating and with optimised drying, corresponding metal sheet, part and vehicle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"SEP 1941:2012-05: Messung des Welligkeitskennwertes Wsa(1-5) an kaltgewaltzten Flacherzeugnissen", 1 June 2012, DEUTSCHE INDUSTRY NORM, XP009195399 *
DEUTSCHER O: "Characterising the surface waviness of hot dip galvanised steel sheets for optical high-quality paintability (Carsteel)", 1 January 2009 (2009-01-01), pages 1 - 133, XP002717503, Retrieved from the Internet <URL:http://bookshop.europa.eu/is-bin/INTERSHOP.enfinity/WFS/EU-Bookshop-Site/en_GB/-/EUR/ViewPublication-Start?PublicationKey=KINA23854> [retrieved on 20131202], DOI: 10.2777/65928 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020069734A1 (en) * 2018-10-02 2020-04-09 Tata Steel Ijmuiden B.V. Coated metal sheet, method to provide such a coated metal sheet, and hot dip galvanizing device to manufacture such a coated metal sheet

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