WO2024028763A1 - Tôle d'acier d'épaisseur variable ayant un risque réduit de rupture différée après durcissement par trempe sous presse et procédé pour la fabrication de celle-ci - Google Patents
Tôle d'acier d'épaisseur variable ayant un risque réduit de rupture différée après durcissement par trempe sous presse et procédé pour la fabrication de celle-ci Download PDFInfo
- Publication number
- WO2024028763A1 WO2024028763A1 PCT/IB2023/057782 IB2023057782W WO2024028763A1 WO 2024028763 A1 WO2024028763 A1 WO 2024028763A1 IB 2023057782 W IB2023057782 W IB 2023057782W WO 2024028763 A1 WO2024028763 A1 WO 2024028763A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- press
- variable thickness
- steel sheet
- coated steel
- hardened
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 10
- 230000003111 delayed effect Effects 0.000 title description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 15
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 239000011777 magnesium Substances 0.000 claims abstract description 13
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 13
- 239000011701 zinc Substances 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011575 calcium Substances 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052745 lead Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 3
- 229910052718 tin Inorganic materials 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 16
- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 28
- 239000001257 hydrogen Substances 0.000 description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 24
- 239000000203 mixture Substances 0.000 description 15
- 238000010521 absorption reaction Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
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- 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
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0478—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular surface treatment
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- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22C—ALLOYS
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- C22C—ALLOYS
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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
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- 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
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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
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- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- C—CHEMISTRY; METALLURGY
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- 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
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
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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
- 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
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
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- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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- C—CHEMISTRY; METALLURGY
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
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- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
- B21D35/006—Blanks having varying thickness, e.g. tailored blanks
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- 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
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- 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
- C21D2261/00—Machining or cutting being involved
Definitions
- the present invention deals with a method to manufacture press-hardened steel parts with a variable thickness and having a minimum risk of delayed fracture.
- the invention is particularly well suited for the manufacture of automotive vehicles.
- Press hardening is known as critical for hydrogen absorption, increasing the sensitivity to delayed fracture. Absorption may occur at the austenitization heat treatment, which is the heating step prior to the press forming itself.
- the saturation of hydrogen into steel is indeed dependent from the metallurgic phase. Furthermore, at high temperature the water in the furnace dissociates at the surface of the steel sheet into hydrogen and oxygen.
- Parts with variable thickness are usually produced by continuous flexible rolling, a process where the sheet thickness obtained after rolling is variable in the rolling direction. This occurs in relationship with the load which has been applied through the rollers to the sheet during the rolling process as described in the patent EP1074317.
- Flexible rolling is characterized in that the roll gap is deliberately changed during the rolling operation.
- the object of flexible rolling is to produce a rolled sheet with a load- and weight-optimized cross section. The thickness of such a steel sheet with variable thickness is inherited from the rolling.
- a blank cut from a strip with variable thickness is commonly known as a tailor rolled blank.
- Tailor rolled blanks have one portion rolled at a rolling ratio and at least another portion rolled at a different rolling ratio. Because of flexible rolling, tailor rolled blanks have a portion with a thickness ti and at least another portion with a different thickness t2. Usually, such rolling ratios have values from 1 to 60%.
- the resulting parts with variable thickness are known to absorb more hydrogen during the austenitization heat treatment than standard parts with uniform thickness.
- the patent application EP3489386 discloses a coated steel sheet which is subject to particularly low hydrogen absorption during the press-hardening process and whose surface enables simple and good further processing.
- the solution proposed is a coated steel substrate for hot working, comprising: a first coating containing at least 85% by weight aluminum and a second coating overlying the first coating; wherein the second coating is a copper-containing coating.
- the method according to this application is particularly suitable for flexibly rolled strip material, since the thinner rolled substrate sections also have increased resistance to the absorption of hydrogen after the application of the nanocrystalline zinc-copper coating.
- this solution requires a second coating on top of the aluminum- based coating. This induces an additional process step and corresponding costs and complexity.
- the object of the invention is to provide a steel sheet with variable thickness suitable for press hardening, that can be used to manufacture a part with variable thickness with a limited hydrogen absorption, independently of the heating time used for press hardening. It particularly aims to make available a part having excellent resistance to delayed fracture.
- Another object of the invention is to provide a manufacturing method according to claim 4.
- a final object of the invention is the use of such a part according to claim 10.
- the invention relates to a steel sheet coated with a metallic coating comprising zinc, silicon, magnesium, up to 3.0% of iron, optional elements chosen from Pb, Ni, Zr, Hf, Sr, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, or Bi, the content by weight of each element being less than 0.3%, optionally up to 100 ppm of Calcium, and unavoidable impurities up to 0.02 %, the balance being aluminum.
- the coating comprises, by weight, from 1.0 to 11.0 of zinc, from 1.0 to 7.0 % of silicon, from 1.0 to 8.0 % of magnesium, up to 3.0% of iron, and unavoidable impurities up to 0.02 %, the balance being aluminum.
- the coating comprises, by weight, from 6.0 to 10.0 % of zinc, from 1 .0 to 4.0 % of silicon, from 1 .0 to 4.0 % of magnesium, up to 3.0% of iron, and unavoidable impurities up to 0.01 %, the balance being aluminum.
- the coating comprises, in weight percent, from 7.5 to 9.0 % of zinc, from 2.0 to 4.0 % of silicon and from 1 .5 to 2.5 % of magnesium, the balance being aluminum.
- the steel sheet according to the invention can be manufactured by hot dip galvanizing in a bath, the temperature of which is set from 600 to 700°C, preferably from 620 to 650°C.
- the coating weight controlled by the wiping process can be from 50 to 500 g/m 2 , possibly from 80 to 150 g/m 2 and preferably from 100 and 120 g/m 2 for the sum of both sides of the steel sheet.
- the steel sheet according to the invention can be obtained by hot rolling and optionally cold rolling depending on the desired thickness, which can be for example between 1 .0 and 4.0 mm.
- the substrates to be coated can have any composition, depending on the mechanical properties required.
- steel When steel is used for press-hardening, its composition is preferably as described below.
- the coated steel sheet After being coated, the coated steel sheet is submitted to a flexible rolling operation, after which the sheet has a variable thickness in rolling direction.
- the flexible rolling is preferably a cold rolling operation.
- the rolling ratio is from 1 to 60%, preferably from 5 to 50%.
- the re-rolled material obtained is then a tailor rolled steel sheet.
- Said tailor rolled steel sheet is then is cut to obtain a tailor rolled blank.
- the flexible rolling operation usually occurs on a single stand, reversible rolling mill in one stage.
- the coating is then also reduced in thickness. After rolling, the sheet may have a thickness down to 0.8 or even 0.6 mm.
- the method according to the invention comprises the following steps:
- step F the cooling of the part having a variable thickness obtained at step E) to obtain a press-hardened part with variable thickness.
- any steel can be advantageously used in the frame of the invention.
- steel having high mechanical strength is needed, for parts of structure of automotive vehicle, steel having a tensile resistance superior to 500MPa, advantageously between 500 and 2000MPa before or after heattreatment, can be used.
- the weight composition of steel sheet is preferably as follows: 0.03% ⁇ C ⁇ 0.50% ; 0.3% ⁇ Mn ⁇ 3.0% ; 0.05% ⁇ Si ⁇ 0.8% ; 0.015% ⁇ Ti
- the steel sheet is 22MnB5 with the following weight composition: 0.20% ⁇ C ⁇ 0.25%; 0.15% ⁇ Si ⁇ 0.35%; 1.10% ⁇ Mn ⁇ 1.40%; 0% ⁇ Cr ⁇ 0.30%; 0.020% ⁇ Ti ⁇ 0.060%; 0.020% ⁇ Al ⁇ 0.060%; 0.002% ⁇ B ⁇ 0.004%, the remainder being iron and unavoidable impurities from the manufacture of steel.
- the steel sheet has the following weight composition: 0.24% ⁇ C ⁇ 0.38%; 0.40% ⁇ Mn ⁇ 3%; 0.10% ⁇ Si ⁇ 0.70%; 0.015% ⁇ Al ⁇ 0.070%; Cr ⁇ 2%; 0.25% ⁇ Ni ⁇ 2%; 0.015% ⁇ Ti ⁇ 0.10%; Nb ⁇ 0.060%; 0.0005% ⁇ B ⁇ 0.0040%; the remainder being iron and unavoidable impurities resulting from the manufacture of steel.
- the steel sheet can have the following weight composition: 0.30% ⁇ C ⁇ 0.40%; 0.5% ⁇ Mn ⁇ 1.0%; 0.40% ⁇ Si ⁇ 0.80%; 0.1 % ⁇ Cr ⁇ 0.4%; 0.1 % ⁇ Mo ⁇ 0.5%; 0.01 % ⁇ Nb ⁇ 0.1 %; 0.01 % ⁇ Al ⁇ 0.1 %; 0.008% ⁇ Ti ⁇ 0.003%; 0.0005% ⁇ B ⁇ 0.003%; 0.0% ⁇ P ⁇ 0.02%; 0.0% ⁇ Ca ⁇ 0.001 %; 0.0% ⁇ S ⁇ 0.004 %; 0.0% ⁇ N ⁇ 0.005 %, the remainder being iron and unavoidable impurities resulting from the manufacture of steel.
- the steel sheet has the following weight composition: 0.040% ⁇ C ⁇ 0.100%; 0.80% ⁇ Mn ⁇ 2.00%; 0% ⁇ Si ⁇ 0.30%; 0% ⁇ S ⁇ 0.005%; 0% ⁇ P ⁇ 0.030%; 0.010% ⁇ Al ⁇ 0.070%; 0.015% ⁇ Nb ⁇ 0.100%; 0.030% ⁇ Ti ⁇ 0.080%; 0% ⁇ N ⁇ 0.009%; 0% ⁇ Cu ⁇ 0.100%; 0% ⁇ Ni ⁇ 0.100%; 0% ⁇ Cr ⁇ 0.100%; 0% ⁇ Mo ⁇ 0.100%, the balance being iron and unavoidable impurities from the manufacture of steel.
- the steel sheet has the following weight composition: 0.06% ⁇ C ⁇ 0.1 %, 1 % ⁇ Mn ⁇ 2%, Si ⁇ 0.5%, Al ⁇ 0.1 %, 0.02% ⁇ Cr ⁇ 0.1 %, 0.02%
- the steel sheet has the following weight composition: 0.015% ⁇ C ⁇ 0.25%; 0.5% ⁇ Mn ⁇ 1.8%; 0.1 % ⁇ Si ⁇ 1.25%; 0.01 % ⁇ Al ⁇ 0.1 %; 0.1 % ⁇ Cr ⁇ 1 .0%; 0.01 % ⁇ Ti ⁇ 0.1 %; 0% ⁇ S ⁇ 0.01 %; 0.001 % ⁇ B ⁇ 0.004%; 0%
- the steel sheet has the following weight composition: 0.2% ⁇ C
- step C a heat treatment of the blank is performed at a temperature from 800 to 970°C, preferably from 840 to 950°C. Said blank is maintained during a dwell time from 1 to 15 minutes to have a full austenitic structure. During the heat treatment, the pre-coating forms an alloy layer having a high resistance to corrosion and abrasion.
- the atmosphere of the furnace has an influence on the amount of hydrogen absorbed into the steel sheet during heat treatment. For instance, with a dew point of 20°C, it is known that the hydrogen absorption may be significant, whereas a heat treatment under dry atmosphere is much less risky.
- step D after the heat treatment, the blank is then transferred to a presshardening tool.
- step E the press-hardening takes place preferably at a temperature from 600 to 830°C.
- step F the part is cooled in the press-hardening tool or after the transfer to a specific cooling tool.
- the cooling rate is controlled depending on the steel composition, in such a way that the final microstructure after press hardening is consistent with the targeted mechanical properties.
- the part can be additionally tempered to reach the targeted microstructure and mechanical properties.
- the steel microstructure comprises, in terms of volume fraction, at least 95% of martensite.
- the steel microstructure comprises after press hardening, in terms of volume fraction, at least 50% of martensite and less than 40 % of bainite.
- the steel microstructure comprises after press hardening, in terms of volume fraction, from 5 to 20 % of martensite, up to 10 % of bainite and at least 75 % of equiaxed ferrite.
- a coated part according to the invention is thus obtained by press hardening but is also achievable by any suitable combination of cold-stamping and press hardening.
- step F The part obtained in step F is topped by a superficial oxide layer on its outer surface.
- This oxide layer comprises aluminum, zinc and magnesium from the coating and iron from the steel substrate. Iron has diffused through the coating during heat treatment.
- a hydrogen content of 0.6 ppm or less is considered satisfying.
- a hydrogen content of more than 0.6 ppm may induce risks of later delayed fracture.
- the inventors have found that the composition of the metallic coating has an influence on hydrogen absorption of rolled material.
- the coating composition according to the invention allows to keep the hydrogen content in the press- hardened part below 0.6 ppm, whatever the rolling ratio.
- the superficial oxide layer can act as a barrier to hydrogen, notably if said oxide layer contains zinc, magnesium and if it has a minimum thickness.
- the oxide layer contains elements coming from the coating.
- the oxide layer contains zinc and magnesium from the aluminum-based coating; and the oxide layer has a minimum thickness of 0.4 pm.
- the oxide layer has a minimum thickness of 0.5 pm, advantageously 0.6 pm.
- steel sheets used are 22MnB5.
- the samples were heated for 5 and 12 minutes in a furnace at 900°C with a dew point of + 20°C.
- the hydrogen content absorbed by the steel sheet during the heat treatment was measured by thermic desorption using a Thermal Desorption Analyzer or TDA. To this end, each sample was placed in a quartz room and heated slowly in an infrared furnace under a nitrogen flow. The released mixture hydrogen/nitrogen was picked up by a leak detector and the hydrogen concentration was measured by a mass spectrometer. The oxide layer was measured by observation of cross-section with a microscope. The minimum value along the cross-section is reported.
- Jnderlined values are not according to the invention.
- Trials 4 to 6 which composition of coating is not according to the invention, contain more than 0.60 ppm hydrogen, which induces risks of delayed fracture. Their oxide layer thickness is too small.
- Trials 1 to 3 contain at most 0.40 ppm of hydrogen and a thick oxide layer. They show that a part coated with a coating according to the invention, with variable thickness obtained by rolling a portion of it at a rolling ratio of 30% and another portion of it at a rolling ratio of 50% is solving the problem of fracture risks.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
L'invention concerne une tôle d'acier revêtue d'épaisseur variable dans la direction de laminage, ayant une partie laminée à un taux de laminage de 1 à 60 % et au moins une autre partie laminée à un taux de laminage différent, le revêtement comprenant du zinc, du silicium, du magnésium, jusqu'à 3,0 % en poids de fer, des éléments facultatifs choisis parmi Ni, Zr, Hf, Sr, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr ou Bi, la teneur en poids de chacun des éléments facultatifs étant inférieure à 0,3 % en poids, facultativement jusqu'à 100 ppm de calcium, et les impuretés inévitables jusqu'à 0,02 % en poids, le reste étant de l'aluminium, ledit revêtement ayant un poids de revêtement de 50 à 500 g/m² pour la somme des deux côtés avant un laminage flexible.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IBPCT/IB2022/057248 | 2022-08-04 | ||
PCT/IB2022/057248 WO2024028640A1 (fr) | 2022-08-04 | 2022-08-04 | Feuille d'acier à épaisseur variable présentant un risque réduit de fracture retardée après emboutissage à chaud, procédé d'emboutissage à chaud, pièce d'acier revêtue emboutie à chaud |
Publications (1)
Publication Number | Publication Date |
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WO2024028763A1 true WO2024028763A1 (fr) | 2024-02-08 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2022/057248 WO2024028640A1 (fr) | 2022-08-04 | 2022-08-04 | Feuille d'acier à épaisseur variable présentant un risque réduit de fracture retardée après emboutissage à chaud, procédé d'emboutissage à chaud, pièce d'acier revêtue emboutie à chaud |
PCT/IB2023/057782 WO2024028763A1 (fr) | 2022-08-04 | 2023-08-01 | Tôle d'acier d'épaisseur variable ayant un risque réduit de rupture différée après durcissement par trempe sous presse et procédé pour la fabrication de celle-ci |
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PCT/IB2022/057248 WO2024028640A1 (fr) | 2022-08-04 | 2022-08-04 | Feuille d'acier à épaisseur variable présentant un risque réduit de fracture retardée après emboutissage à chaud, procédé d'emboutissage à chaud, pièce d'acier revêtue emboutie à chaud |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1074317A2 (fr) | 1999-08-06 | 2001-02-07 | Muhr und Bender KG | Procédé pour le laminage flexible d'une bande métallique |
WO2017017514A1 (fr) * | 2015-07-30 | 2017-02-02 | Arcelormittal | Procédé de fabrication d'une pièce durcie ne présentant aucun problème de lme |
EP3489386A1 (fr) | 2017-11-27 | 2019-05-29 | Muhr und Bender KG | Substrat en acier revêtu et procédé de fabrication d'un composant durci à partir d'un substrat en acier revêtu |
EP3733922A1 (fr) * | 2017-12-26 | 2020-11-04 | Posco | Tôle d'acier de placage pour formage par pressage à chaud, élément de formage utilisant celle-ci et procédé de fabrication connexe |
WO2021084305A1 (fr) * | 2019-10-30 | 2021-05-06 | Arcelormittal | Procédé d'emboutissage à chaud |
CN114807740A (zh) * | 2021-01-28 | 2022-07-29 | 宝山钢铁股份有限公司 | 一种镀铝钢板、热成形部件及制造方法 |
-
2022
- 2022-08-04 WO PCT/IB2022/057248 patent/WO2024028640A1/fr unknown
-
2023
- 2023-08-01 WO PCT/IB2023/057782 patent/WO2024028763A1/fr unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1074317A2 (fr) | 1999-08-06 | 2001-02-07 | Muhr und Bender KG | Procédé pour le laminage flexible d'une bande métallique |
WO2017017514A1 (fr) * | 2015-07-30 | 2017-02-02 | Arcelormittal | Procédé de fabrication d'une pièce durcie ne présentant aucun problème de lme |
EP3489386A1 (fr) | 2017-11-27 | 2019-05-29 | Muhr und Bender KG | Substrat en acier revêtu et procédé de fabrication d'un composant durci à partir d'un substrat en acier revêtu |
EP3733922A1 (fr) * | 2017-12-26 | 2020-11-04 | Posco | Tôle d'acier de placage pour formage par pressage à chaud, élément de formage utilisant celle-ci et procédé de fabrication connexe |
WO2021084305A1 (fr) * | 2019-10-30 | 2021-05-06 | Arcelormittal | Procédé d'emboutissage à chaud |
CN114807740A (zh) * | 2021-01-28 | 2022-07-29 | 宝山钢铁股份有限公司 | 一种镀铝钢板、热成形部件及制造方法 |
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WO2024028640A1 (fr) | 2024-02-08 |
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