EP3861146A1 - Tôle métallique revêtue, procédé de fabrication d'une telle tôle métallique revêtue et dispositif de galvanisation par immersion à chaud pour fabriquer une telle tôle métallique revêtue - Google Patents

Tôle métallique revêtue, procédé de fabrication d'une telle tôle métallique revêtue et dispositif de galvanisation par immersion à chaud pour fabriquer une telle tôle métallique revêtue

Info

Publication number
EP3861146A1
EP3861146A1 EP18788682.5A EP18788682A EP3861146A1 EP 3861146 A1 EP3861146 A1 EP 3861146A1 EP 18788682 A EP18788682 A EP 18788682A EP 3861146 A1 EP3861146 A1 EP 3861146A1
Authority
EP
European Patent Office
Prior art keywords
less
metal sheet
depth
gas knife
wsa
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.)
Pending
Application number
EP18788682.5A
Other languages
German (de)
English (en)
Inventor
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
Original Assignee
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.)
Filing date
Publication date
Application filed by Tata Steel Ijmuiden BV filed Critical Tata Steel Ijmuiden BV
Publication of EP3861146A1 publication Critical patent/EP3861146A1/fr
Pending legal-status Critical Current

Links

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
    • C23C2/14—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
    • 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
    • C23C2/14—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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • COATED METAL SHEET METHOD TO PROVIDE SUCH A COATED METAL SHEET, AND HOT DIP GALVANIZING DEVICE TO MANUFACTURE SUCH A COATED METAL SHEET
  • 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, wherein each stabilization roll is entirely provided below a predefined depth level 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.
  • Wsa is selected at a value representing a targeted maximum waviness, and values for distance D, height H and Depth are calculated.
  • the method of the invention can suitably be executed by providing that D is 9 mm or less, preferably 8 mm or less, preferably 7 mm or less.
  • the method of the invention can be executed by providing that H is 550 mm or less, preferably 400 mm or less, more preferably 200 mm or less.
  • Depth is 150 mm or less, preferably 140 mm or less, more preferably 130 mm or less, most preferably 120 mm or less.
  • Ra is determined in accordance with ISO 4287, using a cut-off of 2.5 mm.
  • Ra is 4.5 pm or less, 1.5 pm or less, preferably 0.6 pm or less.
  • a coated metal sheet can effectively be provided with a waviness Wsa of 0.41 pm or less, preferably 0.35 pm or less, more preferably 0.31 pm or less, more preferably 0.26 pm or less, most preferably 0.23 pm or less.
  • a suitable minimum value for the targeted maximum waviness Wsa is 0.18 pm.
  • hot dip galvanizing device D is 9 mm or less, preferably 8 mm or less, more preferably 7 mm or less.
  • hot dip galvanizing device H is 550 mm or less, preferably 400 mm or less, more preferably 200 mm or less.
  • Preferably Depth is 150 mm or less, preferably 140 mm or less, more preferably 130 mm or less, most preferably 120 mm or less.
  • Ra is 4.5 pm or less, 1.5 pm or less, preferably 0.6 pm or less.
  • FIG. 1 schematically shows a hot dip galvanizing device.
  • a typical flow of manufacturing steps that leads to a coated metal sheet according to the invention is as follows: A metal slab is cast, and subsequently hot rolled in a hot strip mill to provide a metal strip, that is processed in a pickling line, cold rolled in a cold rolling mill, annealed in a continuous annealing line, and provided with a metal coating in a hot dip galvanizing line, temper rolled in a temper mill, shipped to customers, press formed and painted. 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 1 shows a hot dip galvanizing device 1 1 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.
  • Figure 1 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.
  • This 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.
  • Above the liquid bath at least one gas knife 19 is provided, which has an outlet 20 to project -in known way- wiping gas on the metal coating provided on the surface or surfaces 12, 13 of the metal sheet 15 that passes along the gas knife 19.
  • Figure 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 3 shows the influence of the roughness Ra of the last working rolls in the cold rolling mill in relation to X and their impact on the waviness of the product.
  • 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 parameters to arrive at a target Wsa and it also shows the measured waviness as Realised Wsa.
  • X D * ln(H * Depth), and Ra stands for the roughness of the working rolls in the last stand of the cold rolling mill.
  • the stabilization roll 17 is preferably provided at a depth D below surface level 18 of the liquid bath of the metal coating 16 in dependence of the roughness Ra of the final working rolls of the cold rolling mill in order to achieve a maximum waviness Wsa of the coated metal sheet. Further preferred values of the roughness Ra are equal or less than 4.5 pm, equal or less than 1.5 pm, and more preferably 0.6 pm or less.
  • the method of coating a metal sheet according to the invention results in a coated metal sheet with a waviness value Wsa equal or less than 0.41 pm; preferably equal or less than 0.35 pm; more preferably equal or less than 0.31 pm; more preferably equal or less than 0.26 pm; most preferably equal or less than 0.23 pm.

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)

Abstract

L'invention concerne un procédé de fourniture d'un revêtement sur une tôle métallique, une tôle métallique laminée à froid étant soumise à une galvanisation par immersion à chaud pour fournir un revêtement métallique sur la tôle métallique, ladite galvanisation par immersion à chaud comprenant le guidage de la tôle métallique dans un bain liquide du revêtement métallique à l'aide d'au moins un rouleau de stabilisation disposé à une profondeur prédéfinie (Profondeur) au-dessous du niveau superficiel du bain liquide, et l'essuyage du revêtement métallique qui est déposé sur la tôle métallique à l'aide d'au moins une lame à gaz ayant une sortie qui projette un gaz d'essuyage sur le revêtement métallique présent sur la tôle métallique qui passe le long de la lame à gaz, une distance (D) de ladite lame à gaz à la tôle métallique passante et une hauteur (H) de ladite lame à gaz au-dessus du bain liquide du revêtement métallique sont sélectionnées afin d'avoir certaines valeurs de manière à satisfaire à une formule X = (Wsa - 0,1395) / 0,0016, dans laquelle X = D * ln (H * Profondeur) et dans laquelle Wsa est sélectionnée afin d'avoir une valeur représentant une ondulation maximale ciblée.
EP18788682.5A 2018-10-02 2018-10-02 Tôle métallique revêtue, procédé de fabrication d'une telle tôle métallique revêtue et dispositif de galvanisation par immersion à chaud pour fabriquer une telle tôle métallique revêtue Pending EP3861146A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/076874 WO2020069734A1 (fr) 2018-10-02 2018-10-02 Tôle métallique revêtue, procédé de fabrication d'une telle tôle métallique revêtue et dispositif de galvanisation par immersion à chaud pour fabriquer une telle tôle métallique revêtue

Publications (1)

Publication Number Publication Date
EP3861146A1 true EP3861146A1 (fr) 2021-08-11

Family

ID=63878634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18788682.5A Pending EP3861146A1 (fr) 2018-10-02 2018-10-02 Tôle métallique revêtue, procédé de fabrication d'une telle tôle métallique revêtue et dispositif de galvanisation par immersion à chaud pour fabriquer une telle tôle métallique revêtue

Country Status (2)

Country Link
EP (1) EP3861146A1 (fr)
WO (1) WO2020069734A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115233129A (zh) * 2022-07-18 2022-10-25 首钢京唐钢铁联合有限责任公司 一种带钢、带钢热镀锌的控制方法和装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69329831T2 (de) * 1993-04-28 2001-04-19 Kawasaki Steel Co Verfahren zur regulierung der adhesion beim abstreifen mittels gas
WO2014135753A1 (fr) * 2013-03-06 2014-09-12 Arcelormittal Investigacion Y Desarrollo, S.L. Procédé de réalisation d'une tôle à revêtement znal avec un essorage optimisé, tôle, pièce et véhicule correspondants
WO2018073115A1 (fr) * 2016-10-17 2018-04-26 Tata Steel Ijmuiden B.V. Acier pour pièces peintes
EP3382054A1 (fr) * 2017-03-30 2018-10-03 Tata Steel IJmuiden B.V. Feuille de métal revêtue, procédé pour produire une telle feuille de métal revêtue et dispositif de galvanisation par immersion à chaud pour la fabrication d'une telle feuille de métal revêtue

Also Published As

Publication number Publication date
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