EP3701055A1 - A method for the manufacture of a coated steel sheet, two spot welded metal sheets and use thereof - Google Patents
A method for the manufacture of a coated steel sheet, two spot welded metal sheets and use thereofInfo
- Publication number
- EP3701055A1 EP3701055A1 EP18793483.1A EP18793483A EP3701055A1 EP 3701055 A1 EP3701055 A1 EP 3701055A1 EP 18793483 A EP18793483 A EP 18793483A EP 3701055 A1 EP3701055 A1 EP 3701055A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel sheet
- coating
- anyone
- zinc
- nickel
- 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- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 title claims description 16
- 239000002184 metal Substances 0.000 title claims description 16
- 238000000576 coating method Methods 0.000 claims description 43
- 239000011248 coating agent Substances 0.000 claims description 42
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 34
- 239000011701 zinc Substances 0.000 claims description 25
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 23
- 229910052725 zinc Inorganic materials 0.000 claims description 23
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910001563 bainite Inorganic materials 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 7
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001567 cementite Inorganic materials 0.000 claims description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 2
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 150000003464 sulfur compounds Chemical class 0.000 claims description 2
- 238000003466 welding Methods 0.000 description 15
- 238000005246 galvanizing Methods 0.000 description 13
- 230000004888 barrier function Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910001338 liquidmetal Inorganic materials 0.000 description 4
- 238000004626 scanning electron microscopy Methods 0.000 description 4
- 238000004210 cathodic protection Methods 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising 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
- 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
- C23C2/0224—Two or more thermal pretreatments
-
- 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
- C23C2/026—Deposition of sublayers, e.g. adhesion layers or pre-applied alloying elements or corrosion protection
-
- 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
-
- 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
- C23C28/02—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 only coatings only including layers of metallic material
- C23C28/023—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 only coatings only including layers of metallic material only coatings of metal elements only
- C23C28/025—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 only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
Definitions
- the present invention relates to a method for the manufacture of a coated steel sheet.
- the invention is particularly well suited for the manufacture of automotive vehicles.
- Zinc based coatings are generally used because they allows for a protection against corrosion, thanks to barrier protection and cathodic protection.
- the barrier effect is obtained by the application of a metallic coating on steel surface.
- the metallic coating prevents the contact between steel and corrosive atmosphere.
- the barrier effect is independent from the nature of coating and substrate.
- sacrificial cathodic protection is based on the fact that zinc is a metal less noble that steel. Thus, if corrosion occurs, zinc is consumed preferentially to steel. Cathodic protection is essential in areas where steel is directly exposed to corrosive atmosphere, like cut edges where the surrounding zinc will be consumed before steel.
- US2012100391 discloses a method for manufacturing a hot-dip galvanized steel sheet having good plating qualities, plating adhesion and spot weldability, the method comprising:
- CM coating amount
- the alloy phase is a Fe- Zn alloy phase accounting for 1 -20% of the cross-sectional area of the galvanized layer.
- the object of the invention is to provide a steel sheet coated with a metallic coating which does not have LME issues. It aims to make available, in particular, an easy to implement method in order to obtain a part which does not have LME issues after the forming and/or the welding.
- Another object is achieved by providing a steel sheet according to claim 17.
- the steel sheet can also comprise any characteristics of claims 16 to 22.
- spot welded joint can also comprise characteristics of claims 23 to 26.
- steel or “steel sheet” means a steel sheet, a coil, a plate having a composition allowing the part to achieve a tensile strength up to 2500 MPa and more preferably up to 2000MPa.
- the tensile strength is above or equal to 500 MPa, preferably above or equal to 980 MPa, advantageously above or equal to 1 180 MPa and even above or equal 1470 MPa.
- the invention relates to method for the manufacture of a coated steel sheet comprising the following successive steps:
- step B the coating of the steel sheet obtained in step A) with a first coating comprising nickel, such first coating not comprising iron, having a thickness equal or above 0.5 ⁇ and
- the steel sheet is annealed in a continuous annealing.
- the continuous annealing comprises a heating, a soaking and a cooling step. It can further comprise a pre-heating step.
- the thermal treatment is performed in an atmosphere comprising from 1 to 30% of H 2 at a dew point between -10 and -60°C.
- the atmosphere comprises from 1 to 10% of H 2 at a dew point between -10°C and -60°C.
- the first coating comprising nickel is deposited by any deposition method known by the man skilled in the art. It can be deposited by vacuum deposition or electro-plating method. Preferably, it is deposited by electro-plating method.
- the first coating comprises above 80%, more preferably above 90% by weight of nickel.
- the first coating does not comprise phosphorus, nickel hydroxide or sulfur compounds such as sulfate salt.
- the first coating consists of nickel.
- the amount of nickel is >99% by weight and preferably is of 100%.
- the first coating has a thickness equal or above ⁇ . ⁇ and advantageously equal or above 1 .6 ⁇ . More preferably, the first coating has a thickness between 1 .8 to 7.0 ⁇ .
- the second layer comprises above 50%, more preferably above 75% of zinc and advantageously above 90% of zinc.
- the second layer does not comprise nickel.
- the second layer can be deposited by any deposition method known by the man skilled in the art. It can be by hot-dip coating, by vacuum deposition or by electro-galvanizing.
- the coating based on zinc comprises 0.01 -8.0% Al, optionally 0.2-8.0% Mg, the remainder being Zn.
- the coating based on zinc is deposited by hot-dip galvanizing.
- the molten bath can also comprise unavoidable impurities and residuals elements from feeding ingots or from the passage of the steel sheet in the molten bath.
- the optionally impurities are chosen from Sr, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, Zr or Bi, the content by weight of each additional element being inferior to 0.3% by weight.
- the residual elements from feeding ingots or from the passage of the steel sheet in the molten bath can be iron with a content up to 5.0%, preferably 3.0%, by weight.
- the second layer consists of zinc.
- the percentage of Aluminum is comprised between 0.15 and 0.40% in the bath.
- the steel sheet has a microstructure comprising from 1 to 50% of residual austenite, from 1 to 60% of martensite and optionally at least one element chosen from: bainite, ferrite, cementite and pearlite.
- the martensite can be tempered or untempered.
- the steel sheet has a microstructure comprising from 5 to 25 % of residual austenite.
- the steel sheet has a microstructure comprising from 1 to 60% and more preferably between 10 to 60% of tempered martensite.
- the steel sheet has a microstructure comprising from 10 to
- bainite such bainite comprising from 10 to 20% of lower bainite, from 0 to 15% of upper bainite and from 0 to 5% of carbide free bainite.
- the steel sheet has a microstructure comprising from 1 to 25% of ferrite.
- the steel sheet has a microstructure comprising from 1 to 15% untempered martensite.
- assembly After the manufacture of a steel sheet, in order to produce some parts of a vehicle, it is known to assembly by welding two metal sheets.
- a spot welded joint is formed during the welding of at least two metal sheets, said spot being the link between the at least two metal sheets.
- the welding is performed with an effective intensity is between 3kA and 15kA and the force applied on the electrodes is between 150 and 850 daN with said electrode active face diameter being between 4 and 10mm.
- a spot welded joint of at least two metal sheets, comprising the coated steel sheet according to the present invention is obtained, such said joint containing less than 3 cracks having a size above ⁇ ⁇ and wherein the longest crack has a length below 300 ⁇ .
- the second metal sheet is a steel sheet or an aluminum sheet. More preferably, the second metal sheet is a steel sheet according to the present invention.
- the spot welded joint comprises a third metal sheet being a steel sheet or an aluminum sheet.
- the third metal sheet is a steel sheet according to the present invention.
- the steel sheet or the spot welded joint according to the present invention can be used for the manufacture of parts for automotive vehicle.
- Trials 1 to 4 were prepared by performing an annealing in a continuous annealing in an atmosphere comprising 5% of H 2 and 95% of N 2 at a dew point of -60°C. The steel sheets were heated at a temperature of 900°C. Then, Trials 1 to 4 were coated with a different nickel coating thicknesses deposited by electro- galvanizing method. Finally, a zinc coating was deposited by electro-galvanizing method. Trial 5 was prepared by deposited a zinc coating by electro-galvanizing method after the continuous annealing of the steel sheet under similar atmosphere.
- Trials according to the present invention show an excellent resistance to LME as compared to Trial 5. Indeed, the number of cracks of Trials according to the present invention is very low, even nonexistent, compared to Trial 5.
- three coated steel sheets were also welded together by resistance spot welding. The number of cracks above ⁇ ⁇ was then evaluated using an optical microscope as well as SEM (Scanning Electron Microscopy) as shown in Table 3.
- Trials according to the present invention show an excellent resistance to LME as compared to Trial 5.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB2017/001281 WO2018115946A1 (en) | 2016-12-21 | 2017-10-24 | A method for the manufacture of a coated steel sheet |
PCT/IB2018/058157 WO2019082037A1 (en) | 2017-10-24 | 2018-10-19 | PROCESS FOR MANUFACTURING COATED STEEL SHEET, TWO STITCHED SHEET METAL SHEETS, AND USE THEREOF |
Publications (1)
Publication Number | Publication Date |
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EP3701055A1 true EP3701055A1 (en) | 2020-09-02 |
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ID=64017401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18793483.1A Withdrawn EP3701055A1 (en) | 2017-10-24 | 2018-10-19 | A method for the manufacture of a coated steel sheet, two spot welded metal sheets and use thereof |
Country Status (9)
Country | Link |
---|---|
US (1) | US20200340124A1 (zh) |
EP (1) | EP3701055A1 (zh) |
KR (1) | KR102206933B1 (zh) |
CN (1) | CN111279006A (zh) |
BR (1) | BR112020006128A2 (zh) |
CA (1) | CA3076994A1 (zh) |
MA (1) | MA50447A (zh) |
WO (1) | WO2019082037A1 (zh) |
ZA (1) | ZA202001589B (zh) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3701056B1 (en) | 2017-10-24 | 2021-12-01 | ArcelorMittal | A method for the manufacture of a coated steel sheet |
WO2019082036A1 (en) | 2017-10-24 | 2019-05-02 | Arcelormittal | METHOD FOR MANUFACTURING COATED STEEL SHEET |
KR102383618B1 (ko) | 2017-10-24 | 2022-04-08 | 아르셀러미탈 | 용융아연도금된 강 시트의 제조 방법 |
CA3082357C (en) | 2017-11-17 | 2022-07-12 | Arcelormittal | A method for the manufacturing of liquid metal embrittlement resistant zinc coated steel sheet |
WO2020245632A1 (en) * | 2019-06-05 | 2020-12-10 | Arcelormittal | A method for manufacturing a metal assembly |
EP4043596B1 (en) * | 2019-10-09 | 2024-03-13 | Nippon Steel Corporation | Steel sheet and method for manufacturing same |
WO2022107580A1 (ja) * | 2020-11-17 | 2022-05-27 | 日本製鉄株式会社 | スポット溶接用めっき鋼板、接合部材、及び自動車用部材、並びに接合部材の製造方法 |
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JP5098217B2 (ja) * | 2005-09-28 | 2012-12-12 | 新日鐵住金株式会社 | 溶接部の耐食性および耐亜鉛脆化割れ性に優れた亜鉛めっき鋼板の溶接継手並びにその製造方法 |
CA2683739C (en) * | 2007-04-11 | 2013-02-19 | Nippon Steel Corporation | Hot dip plated high strength steel sheet for press forming use superior in low temperature toughness and method of production of the same |
US20120100391A1 (en) | 2010-10-21 | 2012-04-26 | Posco | Hot-dip galvanized steel sheet having excellent plating qualities, plating adhesion and spot weldability and manufacturing method thereof |
US20140370330A1 (en) * | 2011-12-27 | 2014-12-18 | Nippon Steel & Sumitomo Metal Corporation | Hot-dip plated high-strength steel sheet for presswork excellent in low-temperature toughness and corrosion resistance and manufacturing method thereof |
MX2014012798A (es) * | 2012-04-23 | 2015-04-14 | Kobe Steel Ltd | Metodo de fabricacion de hoja de acero galvanizado para estampacion en caliente, hoja de acero galvanizado y recocido por inmersion en caliente para estampacion en caliente y metodo de fabricacion de las mismas, y componente estampado en caliente. |
ES2632618T3 (es) * | 2013-02-12 | 2017-09-14 | Tata Steel Ijmuiden Bv | Acero recubierto adecuado para galvanización por inmersión en caliente |
WO2015088523A1 (en) * | 2013-12-11 | 2015-06-18 | ArcelorMittal Investigación y Desarrollo, S.L. | Cold rolled and annealed steel sheet |
KR101585721B1 (ko) * | 2013-12-21 | 2016-01-14 | 주식회사 포스코 | 용접성이 우수한 아연도금강판 및 이의 제조 방법 |
KR101568543B1 (ko) * | 2013-12-25 | 2015-11-11 | 주식회사 포스코 | 액체금속취화에 의한 크랙 저항성이 우수한 용융아연도금강판 |
CN106661652B (zh) * | 2014-07-03 | 2018-10-12 | 安赛乐米塔尔公司 | 用于制造超高强度涂覆或未涂覆钢板的方法和获得的板 |
JP2016089274A (ja) * | 2014-11-04 | 2016-05-23 | 株式会社神戸製鋼所 | ホットスタンプ用めっき鋼板 |
CN107127238B (zh) * | 2016-02-26 | 2019-12-27 | 宝山钢铁股份有限公司 | 一种锌系镀覆钢板或钢带的热冲压成型方法 |
-
2018
- 2018-10-19 BR BR112020006128-0A patent/BR112020006128A2/pt not_active Application Discontinuation
- 2018-10-19 CA CA3076994A patent/CA3076994A1/en not_active Abandoned
- 2018-10-19 CN CN201880068936.4A patent/CN111279006A/zh active Pending
- 2018-10-19 US US16/754,538 patent/US20200340124A1/en not_active Abandoned
- 2018-10-19 KR KR1020207011272A patent/KR102206933B1/ko active IP Right Grant
- 2018-10-19 MA MA050447A patent/MA50447A/fr unknown
- 2018-10-19 WO PCT/IB2018/058157 patent/WO2019082037A1/en unknown
- 2018-10-19 EP EP18793483.1A patent/EP3701055A1/en not_active Withdrawn
-
2020
- 2020-03-13 ZA ZA2020/01589A patent/ZA202001589B/en unknown
Also Published As
Publication number | Publication date |
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BR112020006128A2 (pt) | 2020-09-24 |
US20200340124A1 (en) | 2020-10-29 |
ZA202001589B (en) | 2021-03-31 |
KR102206933B1 (ko) | 2021-01-25 |
MA50447A (fr) | 2020-09-02 |
CN111279006A (zh) | 2020-06-12 |
WO2019082037A1 (en) | 2019-05-02 |
CA3076994A1 (en) | 2019-05-02 |
KR20200047728A (ko) | 2020-05-07 |
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