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EP2888385B2 - Feuille ou bande d'acier revêtue présentant des propriétés avantageuses - Google Patents

Feuille ou bande d'acier revêtue présentant des propriétés avantageuses Download PDF

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Publication number
EP2888385B2
EP2888385B2 EP13755956.3A EP13755956A EP2888385B2 EP 2888385 B2 EP2888385 B2 EP 2888385B2 EP 13755956 A EP13755956 A EP 13755956A EP 2888385 B2 EP2888385 B2 EP 2888385B2
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Prior art keywords
strip
layer
steel
siloxane
sheet
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EP2888385B1 (fr
EP2888385A1 (fr
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Robert Bleeker
Jurgen Wilhelmus Vrenken
Margot Julia Vlot
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Tata Steel Ijmuiden BV
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Tata Steel Ijmuiden BV
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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
    • C23C2/02—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
    • C23C2/04—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
    • 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
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D

Definitions

  • the invention relates to a strip or sheet of cold formable cold rolled steel coated with a zinc alloy layer containing aluminium and magnesium.
  • the invention also relates to a method for producing such a steel strip or sheet, to a method for producing a part from the strip or sheet, and to a product comprising a part made from the steel strip or sheet.
  • zinc alloy coatings containing aluminium and magnesium are often used in view of their improved corrosion and galling resistance in comparison to galvanized or galvannealed coatings.
  • These zinc alloy layers often contain 0.3 - 5 weight% Al and 0.3 - 5 weight% Mg, the remainder being zinc and unavoidable impurities, and optionally at most 0.2 weight % in total of one or more additional elements selected from the group consisting of Pb, Sb, Ti, Ca, Mn, Sn, La, Ce, Cr, Ni, Zr, Bi, Si and Fe.
  • This aluminium and magnesium containing zinc coated steel however has the drawback that the adhesive bonding thereof is less then the adhesive bonding of normal hot dip zinc coated steel. Also the spot weldability of hot dip coatings is often less than that of electrogalvanised steel. Moreover, the aluminium and magnesium containing zinc coatings have a somewhat higher coefficient of friction than normal zinc coatings.
  • one or more of these objects is reached with a strip or sheet of cold formable cold rolled steel coated with a zinc alloy layer, having the features of claim 1.
  • the inventors have surprisingly found that with the siloxane or polysiloxane layer as specified above, the joining behaviour of the zinc alloy coated steel is better than the joining behaviour without such a layer, especially the adhesive bonding behaviour, but also the spot weldability.
  • the strength and failure mode of adhesive bonded joints of the zinc alloy coated steel provided with a siloxane or polysiloxane layer is better than that of the zinc alloy coated steel without such a siloxane or polysiloxane layer.
  • the friction of the zinc alloy coated steel is reduced with at least 10 % with the application of the siloxane or polysiloxane layer, which is advantageous for for instance deep drawing operations.
  • the galling behaviour of the zinc alloy coated steel with the siloxane or polysiloxane layer is at least as good as that of the material without such a layer.
  • Phosphate coverage of the zinc alloy coated steel that has been coated with a siloxane or polysiloxane layer is as good as phosphate coverage of zinc alloy coated steel without siloxane or polysiloxane layer.
  • siloxane or polysiloxane to improve adhesive bonding of aluminium parts is known, but it is not known to use siloxane or polysiloxane for improving the adhesive bonding of zinc or zinc alloy coated steel parts.
  • Siloxane or polysiloxane on zinc coated steels is well known to improve corrosion resistance and lacquer adhesion, but for automotive purposes this has not been an option because of spot welding and phosphate forming limitations.
  • US 5,433,976 discloses a cold rolled steel strip coated with siloxane.
  • WO 2008/102009 A1 discloses a hot dip galvanised cold rolled steel strip coated with a zinc alloy coating layer comprising magnesium and aluminium.
  • a siloxane or polysiloxane layer is used on a hot formable zinc or zinc alloy coated steel strip, sheet or blank resulting in a reduction of the oxidation of the zinc layer and a reduction of zinc losses during the hot forming process.
  • the siloxane or polysiloxane according to the older patent application is thus used for a different type of steel and for a different process.
  • the present invention in contrast relates to cold formable cold rolled steel, not being a steel for hot forming at a temperature of 600° C or above.
  • the cold rolled steel has a composition in weight% of: 0.001 ⁇ C ⁇ 0.15 0.01 ⁇ Mn ⁇ 2.0 0.001 ⁇ Si ⁇ 0.5 Cr ⁇ 1.0 Al ⁇ 0.5 Mo ⁇ 0.2 Ti ⁇ 0.2 P ⁇ 0.12 N ⁇ 0.15 S ⁇ 0.05 B ⁇ 0.01 the remainder being Fe and unavoidable impurities.
  • Steel types having a composition within these ranges are generally used for cold forming operations.
  • the steel strip or sheet has a tensile strength of at most 600 MPa, such as an Interstitial Free steel (IF-steel), a bakehardenable steel or a dual phase steel (DP steel).
  • IF-steel Interstitial Free steel
  • DP steel dual phase steel
  • the zinc alloy layer on the steel has a thickness of 20 - 140 g/m 2 on each side. These zinc alloy thicknesses are generally used in the automotive industry on steel.
  • the siloxane or polysiloxane layer has a layer thickness corresponding with 1 - 8 mg/m 2 Si, preferably a thickness of 1 - 5 mg/m 2 Si. It has been found that with these thicknesses the advantages are retained, while it is preferred to use thin layers from an economic perspective.
  • the siloxane or polysiloxane layer has been formed from a bis-tri(m)ethoxysilylalkane, preferably a bis-triethoxysilylethane (BTSE), and preferably in combination with another silane such as ⁇ -aminopropyltriethoxysilane ( ⁇ APS), bis-aminosilane (BAS), bis-diaminosilane (BDAS), vinyltriacetoxysilane (VTAS), ⁇ -ureidopropyltrimethoxysilane ( ⁇ UPS) and/or bis-trimethoxysilylpropylurea (BUPS).
  • ⁇ APS ⁇ -aminopropyltriethoxysilane
  • BAS bis-aminosilane
  • BDAS bis-diaminosilane
  • VTAS vinyltriacetoxysilane
  • ⁇ UPS ⁇ -ureidopropyltrimethoxysilane
  • BUPS bis-trimethoxys
  • the zinc alloy layer contains 1.0 - 3.5 weight% Al and 1.0 - 3.5 weight% Mg, preferably 1.4 - 2.2 weight% Al and 1.4 - 2.2 weight% Mg.
  • These amounts of Al and Mg in the zinc layer usually provide a corrosion protection that is suitable for automotive purposes. Higher amounts make the zinc alloy comparatively expensive and less easy to weld.
  • the siloxane or polysiloxane layer is covered by an oil.
  • Zinc or zinc alloy coated strip is usually provide with a thin layer of oil before it is supplied to the automotive industry.
  • a method for producing a strip or sheet according to the first aspect of the invention is provided in accordance with claim 9.
  • the silane/silanol containing water based solution contains a fluoride, preferably hydrogen fluoride, fluorosilicic acid, fluorozirconic acid and/or fluorotitanic acid.
  • fluorides are added to improve the adhesion of the siloxane or polysiloxane layer to the zinc alloy layer on the steel strip or sheet.
  • a method for producing a part from a zinc alloy coated cold rolled steel strip or sheet with a siloxane or polysiloxane layer according to the first aspect of the invention is provided, wherein
  • the joining is improved due to the siloxane or polysiloxane layer.
  • one or more other parts are made from a strip or sheet according to the first aspect of the invention.
  • These parts provide a product that has good joining properties, provided by the siloxane or polysiloxane layer that has been provided on the zinc alloy coated steel strip or sheet.
  • An additional advantage is the improved cold forming property of the blanks cut from the steel strip or sheet due to the improved coefficient of friction.
  • the product is provided with a phosphate layer, and subsequently with a paint layer.
  • the car is usually alkaline cleaned and phosphated to provide a good adhesion for the application of a paint layer.
  • a good adhesion will only be obtained when the zinc alloy coating is not hampered by remaining surface contaminants, because the zinc alloy layer must give a good electrochemical reaction with the phosphate solution to result in a fine crystalline, pore-free phosphate layer. It has been found that the applied siloxane or polysiloxane layer does not hinder the forming of a good phosphate layer.
  • Steel grade 1 was a cold rolled boron steel having a gauge of 0.7 mm.
  • Steel grade 2 was a cold rolled formable steel having a gauge of 0.7 mm.
  • the ZnAlMg coating on both steel types was applied on a continuous hot dip galvanising production line where the coating thickness was regulated by nitrogen wiping to about 70 mg/m2 per side (approximately 10 ⁇ m per side).
  • the composition of the coating was approximately 1.6 weight% Al and 1.6 weight% Mg, with a small amount of Fe by reaction of the aluminium with the steel strip during hot dip galvanising (about 0.005 - 0.02 weight% Fe), the remainder being zinc with inevitable impurities.
  • the coated steel was temper rolled with about 0.8% elongation, with Electro Discharge Texturing (EDT) roughness.
  • EDT Electro Discharge Texturing
  • a water based solution containing both bis-triethoxysilylethane (BTSE) and aminopropyltriethoxysilane (APS) has been applied on the ZnAlMg coated steel with a chem. coater to provide a (poly)siloxane layer having a thickness of 2 and 12 mg/m 2 Si respectively after drying and/or curing.
  • BTSE bis-triethoxysilylethane
  • APS aminopropyltriethoxysilane
  • the adhesive used was Betamate 1496V of DOW Chemical. Some samples were not re-oiled after cleaning to evaluate the interaction with the oil separately. In general, the oil will be absorbed by the adhesive, making it slightly less strong.
  • the strength upon failure of the bond is given in Table 1. This strength depends heavily on the steel grade and its gauge, and can only be compared to a similar reference sample.
  • the bond can break in the adhesive (cohesive failure), which is the preferred failure mode. It can also break between the adhesive and the metallic coating (adhesive failure), which is less favourable. Often, the broken bond shows a combination of both failure modes, and the amount of each is estimated visually (in % of the overlap area).
  • Table 1 adhesive properties Steel grade Silane (mg/m2) Oil (prelube) Strength bond (kN) of Standard Deviation (kN) % cohesive % adhesive ref1 1 0 no 8,1 0,6 0 100 ref2 1 12 no 7,2 1,1 10 90 #1 2 no 9,7 0,2 30 70 ref3 2 0 no 4,4 0,1 0 100 ref4 2 0 yes 4,2 0,1 0 100 #2 2 2 no 4,8 0,1 60 40 #3 2 2 yes 4,7 0,1 70 30 #1 and #2 are not according to the invention.
  • the test uses one flat tool and one round tool to develop a high-pressure contact with the sample surfaces.
  • the tool material used was DIN 1.3343. 1 g/m2 of Multidraw PL61 of Zeller & Gmelin prelube oil was applied on the samples.
  • strips of 50 mm width and 300 mm length were pulled at a speed 20 mm/min between a set of tools pushed together with a normal force of 5 kN.
  • the strips were drawn through the tools six times (passes) along a testing distance of 55mm; after each stroke the tools were released and the strips returned to the original starting position in preparation for the next stroke. All tests were conducted at 20°C and performed in triplicate.
  • Figure 1 shows the number of passes on the horizontal axis and the friction coefficient on the vertical axis.
  • the continuous line shows the results of the tests with a siloxane coating
  • the interrupted line shows the results without siloxane coating.
  • the results in Figure 1 show that the thin siloxane layer reduces friction, which means a better drawing behaviour.
  • Samples having a size of 100x200 mm were phosphated according to automotive standards, with a standard automotive alkaline cleaner, activation and phosphate of Chemetall. The amount of resulting phosphate was determined (by weighing) and the crystal size and homogeneity was checked (by secondary electron microscopy).
  • Table 2 Phosphating Steel grade type Silane (mg/m2) Phosphate type (Chemetall) Amount phosphate (g/m2) of Phosphate crystal size and homogeneity ref1 1 0 Spray phosphate GB R2830E3 with 100 -200 ppm F 3,3 OK ref2 1 12 Spray phosphate GB R2830E3 with 100 -200 ppm F 2,4 Not OK #1 1 2 Spray phosphate GB R2830E3 with 3,5 OK 100 - 200 ppm F ref3 2 0 Dip phosphated with GB R2600 2,6 OK #2 2 2 2 Dip phosphated with GB R2600 2,3 OK
  • the welding range was determined according to StahlEisen SEP 1220 Part 2 for a sample without siloxane and in duplicate for a sample with a thin layer of siloxane (2 mg/m 2 Si) on steel grade 2.
  • a standard prelube (1 g/m2 Quaker N6130) was applied on all samples.
  • the welding range is the range between the current (Imin) necessary to achieve the minimum welding nugget and the maximum current (Imax) before splashing occurs during welding.
  • Imin the current necessary to achieve the minimum welding nugget
  • Imax the maximum current
  • a larger welding range is a strong indication for a better electrode life, the number of welds before an electrode needs to be replaced to achieve a good weld.
  • the minimum and maximum welding currents and the welding range are given in Table 3.
  • the welding range of the ZnAlMg coating with the silane (#2 and #3) is larger than the welding range on the same samples without the silane (ref3).
  • Table 3 Welding range Steel grade Silane (mg/m2) Imin (kA) Imax (kA) Range (kA) ref3 2 0 8,4 10,1 1,7 #2 2 2 6,8 10,5 3,7 #3 2 2 8,1 10,6 2,5
  • the phosphated samples (ref3 and #2 from Table 2) were additionally E-coated with 20-25 ⁇ m Cathoguard 500 from BASF for the following tests:
  • For a corrosion test scribes were made on (duplicate) panels with a Van Laar pencil, down to the steel. The panels were subjected to 10 weeks of an accelerated cyclic corrosion test according to VDA 621-415. The paint delamination was evaluated according to Volvo STD 1029.
  • the corrosion results can be found in Figure 2 .
  • the delamination of the E-coat after the corrosion test is given in millimetres.
  • the samples with siloxane layer are denominated A, the samples without siloxane layer are denominated B.
  • the visible delamination is indicated in the white stave, the visible plus non-visible delamination is indicated by the dark stave.
  • the variance in delamination is indicated in the figure. As can be seen, the difference in corrosion resistance of the ZnAlMg coated steel with and without the siloxane layer is small.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
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  • Organic Chemistry (AREA)
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  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating With Molten Metal (AREA)

Claims (13)

  1. Bande ou feuille d'acier laminé à froid, formable à froid, revêtue d'une couche d'alliage de zinc, la couche d'alliage de zinc contenant 0,3 - 5 % en poids d'Al et 0,3 - 5 % en poids de Mg, le reste étant le zinc et les impuretés inévitables, et optionnellement un maximum de 0,2 % en poids en tout d'un ou plusieurs éléments additionnels sélectionnés dans le groupe constitué de Pb, Sb, Ti, Ca, Mn, Sn, La, Ce, Cr, Ni, Zr, Bi, Si et Fe, la couche d'alliage de zinc étant revêtue d'une couche de siloxane ou de polysiloxane, la couche de siloxane ou de polysiloxane ayant une épaisseur de couche correspondant à 1-8 mg/m2 Si, et dans laquelle la couche de siloxane ou de polysiloxane est couverte d'une huile.
  2. Bande ou feuille selon la revendication 1, dans laquelle l'acier laminé à froid a une composition en % de poids de : 0,001 < C < 0,15
    Figure imgb0034
     0,01 < Mn < 2,0
    Figure imgb0035
     0,001 < Si < 0,5
    Figure imgb0036
     Cr < 1.0
    Figure imgb0037
     Al < 0.5
    Figure imgb0038
     Mo < 0.2
    Figure imgb0039
     Ti < 0.2
    Figure imgb0040
     P < 0.12
    Figure imgb0041
     N < 0.15
    Figure imgb0042
     S < 0.05
    Figure imgb0043
     B < 0.01
    Figure imgb0044
     le reste étant Fe et les impuretés inévitables.
  3. Bande ou feuille selon la revendication 1 ou 2, dans laquelle l'acier a une résistance maximale à la traction de 600 MPa, tel qu'un acier sans interstitiels (IFS), un acier durcissable à la cuisson ou un acier biphasé (acier DP).
  4. Bande ou feuille selon la revendication 1, 2 ou 3, dans laquelle la couche d'alliage de zinc sur l'acier a une épaisseur de 20 - 140 g/m2 de chaque côté.
  5. Bande ou feuille selon l'une quelconque des revendications précédentes, dans laquelle la couche de siloxane ou de polysiloxane a une épaisseur de couche correspondant à 1 - 5 mg/m2 Si.
  6. Bande ou feuille selon l'une quelconque des revendications précédentes, où la couche de siloxane ou de polysiloxane a été formée à partir d'un bis-tri(m)éthoxysilylalkane, de préférence un bis-triéthoxysilyléthane (BTSE), et de préférence en combinaison avec un autre silane tel que : γ-aminopropyltriéthoxysilane (γAPS), bis-aminosilane (BAS), bisdiaminosilane (BDAS), vinyltriacétoxysilane (VTAS), γ-ureidopropyl-triméthoxysilane (yUPS) et/ou bis-triméthoxysilylpropylurée (BUPS).
  7. Bande ou feuille selon l'une quelconque des revendications précédentes, dans laquelle la couche d'alliage de zinc contient 1,0 - 3,5 % en poids d'Al et 1,0 - 3,5 % en poids de Mg, de préférence 1,4 - 2,2 % en poids d'Al et 1,4 - 2,2 % en poids de Mg.
  8. Procédé de production d'une bande ou feuille selon l'une quelconque des revendications précédentes, dans lequel la couche de siloxane ou de polysiloxane est formée en fournissant à la couche d'alliage de zinc une solution à base d'eau contenant du silane/silanol appliquée par immersion et/ou pulvérisation avec compression additionnelle, ou par laminage suivi de séchage et/ou durcissement.
  9. Procédé selon la revendication 8, dans lequel la solution à base d'eau contenant du silane/silanol contient un fluorure, de préférence : fluorure d'hydrogène, acide fluorosilicique, acide fluorozirconique et/ou acide fluorotitanique.
  10. Procédé pour produire une pièce à partir d'une bande ou feuille selon l'une quelconque des revendications 1-7, dans lequel
    - un flan est découpé dans la bande ou la feuille
    - le flan est placé dans un outil de formage, tel qu'une presse
    - le flan est formé à froid pour devenir une pièce.
  11. Produit réalisé à partir d'une pièce fabriquée à partir de la bande ou feuille selon l'une quelconque des revendications 1-7 et d'une ou plusieurs autres pièces, dans lequel la pièce réalisée à partir de la bande ou de la feuille est jointe à au moins une des autres pièces au moyen d'un soudage par points et/ou d'un mastic ou d'un adhésif.
  12. Produit selon la revendication 11, dans lequel une ou plusieurs autres pièces sont fabriquées à partir d'une bande ou feuille selon l'une quelconque des revendications 1-7.
  13. Produit selon la revendication 11 ou 12, le produit recevant une couche de phosphate, puis une couche de peinture.
EP13755956.3A 2012-08-27 2013-08-19 Feuille ou bande d'acier revêtue présentant des propriétés avantageuses Active EP2888385B2 (fr)

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EP12006076 2012-08-27
EP12006485 2012-09-14
PCT/EP2013/002498 WO2014032779A1 (fr) 2012-08-27 2013-08-19 Bande ou tôle d'acier revêtu ayant des propriétés avantageuses
EP13755956.3A EP2888385B2 (fr) 2012-08-27 2013-08-19 Feuille ou bande d'acier revêtue présentant des propriétés avantageuses

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EP2888385A1 EP2888385A1 (fr) 2015-07-01
EP2888385B1 EP2888385B1 (fr) 2018-04-11
EP2888385B2 true EP2888385B2 (fr) 2024-11-13

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ES (1) ES2672698T3 (fr)
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TR201807970T4 (tr) 2012-08-27 2018-06-21 Tata Steel Ijmuiden Bv Avantajlı özelliklere sahip kaplanan çelik şerit veya levha.
US10435806B2 (en) 2015-10-12 2019-10-08 Prc-Desoto International, Inc. Methods for electrolytically depositing pretreatment compositions
KR101819393B1 (ko) * 2016-12-22 2018-01-16 주식회사 포스코 용접성 및 프레스 가공성이 우수한 용융 아연계 도금강재 및 그 제조방법
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WO2014032779A8 (fr) 2015-05-21
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