EP3697936A1 - Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils - Google Patents
Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteilsInfo
- Publication number
- EP3697936A1 EP3697936A1 EP18804228.7A EP18804228A EP3697936A1 EP 3697936 A1 EP3697936 A1 EP 3697936A1 EP 18804228 A EP18804228 A EP 18804228A EP 3697936 A1 EP3697936 A1 EP 3697936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wop
- wgb
- coating
- value
- sheet thickness
- 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.)
- Granted
Links
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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
- C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
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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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C23C2/04—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
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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
- C23C2/04—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
- C23C2/12—Aluminium or alloys based thereon
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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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
- C23C2/34—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
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- 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
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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
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
Definitions
- the present invention relates to methods for producing a steel component comprising a substrate and a coating, a corresponding steel component and its use in the automotive sector.
- WO 2015/036151 A1 discloses a method for producing a steel component provided with a metallic, corrosion-protective coating and a corresponding steel component.
- the method according to this document comprises coating a flat steel product with an alloy of aluminum, zinc, magnesium and optionally silicon and iron, cutting a blank from the flat steel product, heating the blank and reshaping the blank to obtain the desired steel component.
- DE 699 07 816 12 discloses a process for producing a coated hot and cold rolled steel sheet having very high strength after thermal treatment.
- a flat steel product is provided with a coating and thermally treated.
- the workpiece is heated to a temperature of over 750 ° C.
- EP 2 993 248 A1 discloses a flat steel product with an aluminum-containing coating, which contains 0.005 to 0.7% by weight of at least one alkali and / or alkaline earth metal, and a process for its production.
- the coated flat steel product is heated to a temperature of 700 to 900 ° C for 360 s, 600 s or 800 s and then reformed.
- H dif f The content of H dif f reduces the duration of the steel tolerable stresses, and there may be spontaneous "hydrogen-induced" fractures under the presence of tensile stresses in the sheet. In order to avoid cracks in the stresses usually present in the body shop, the content of diffusible hydrogen should be below a component-specific value.
- This value depends, among other things, on the complexity of the hot forming operation, the post-processing by, for example, laser cutting, punching, mechanical cutting or hot trimming and the installation situation and joining concept and thus the state of tension in the bodywork.
- the amount of H diff remaining after processing should preferably be ⁇ 0.4 ppm (parts per million) prior to critical shell-building processes, depending on the processing mentioned.
- the ratio of thickness decrease by rolling to starting thickness is called rolling degree.
- the rolling degree applies according to the invention only for a rolling process in which the coating is already present on the substrate.
- the rolled areas of lesser sheet thickness compared to the sheet thickness existing prior to rolling have a significantly higher defect density in the steel substrate due to rolling.
- diffused hydrogen can accumulate better in the rolled regions than in the non-rolled regions, so that after the hot forming and the press-hardening a higher diffusible hydrogen content is present. Consequently, hydrogen-induced crack formation after hot forming and press hardening can occur much more quickly in the case of material rolled after coating.
- a known method of reducing the content of diffusible hydrogen in the component is to lower the dew point in the furnace, in which the steel sheet is heated before forming, in order to prevent the formation of diffusible hydrogen from the existing moisture in the oxidation of the substrate To reduce furnace atmosphere and thereby lower the H diff intake of the steel component.
- the present invention is therefore based on the object to provide a method for the production of steel components comprising a substrate and a coating, can be obtained with the corresponding steel components, which have the lowest possible H diff content to the risk Hydrogen-induced cracking after hot forming and to minimize in subsequent use. Furthermore, it is an object of the present invention to provide a method with which it is possible not to exceed a certain H diff content in a thermoformed component by selecting different furnace parameters depending on the Abwalzgrads and the sheet thickness of the used Stahlflach.
- step (D) forming the heated flat steel product of step (B) in a mold with simultaneous cooling to obtain the steel component.
- the method according to the invention serves to produce a steel component with a content of diffusible hydrogen H dif f of up to 0.4 ppm, preferably 0.01 to 0.4 ppm, particularly preferably 0.05 to 0.4 ppm, for example 0.1, 0.2, 0.3, or 0.4 ppm, each in the material after hot forming.
- H diff describes the amount of hydrogen atoms present in the steel substrate after hot forming in dissolved form.
- Methods for determining the H diff content are known per se to the person skilled in the art, for example desorption mass spectrometry with heated samples (Thermal Desorption Mass Spectrometry (TDMS)).
- Step (A) of the process according to the invention comprises the provision of a flat steel product with a coating comprising (all data in% by weight) 3 to 15 Si, 1 to 3.5 Fe, 0.05 to 5.0 alkali and / or or alkaline earth metals, balance AI and unavoidable impurities, which has a Abwalzgrad-sheet thickness ratio of greater than 0.8 to 200.
- a flat steel product with a suitable coating which appears suitable to the person skilled in the art can be used.
- 0.06 to 0.50 preferably 0.18 to 0.37, particularly preferably 0.20 to 0.25 C,
- 0.10 to 0.50 preferably 0.15 to 0.40, particularly preferably 0.20 to 0.30 Si,
- Remainder Fe and unavoidable impurities containing a coating (all figures in% by weight)
- 0.05 to 5.0 preferably 0.05 to 1, 5, particularly preferably 0, 11 to 0.6 alkali and / or alkaline earth metals, the radical AI and unavoidable impurities.
- Unavoidable impurities in the substrate according to the invention are, for example, Cu, Mo, V, Ni and / or Sn.
- the flat steel product used is preferably a strip, in particular a hot strip or a cold strip, around a sheet, ie. H. a piece of a hot strip or a cold strip, or a board made of a hot strip or a board made of a cold strip.
- the present invention preferably relates to the method according to the invention, wherein the flat steel product is a board made of a hot strip or a board made of a cold strip.
- the steel substrate used according to the invention preferably has a hardness structure, for example at least 80% martensite, the remainder bainite, ferrite and retained austenite.
- the flat steel product according to the invention is provided with a coating, the coating preferably having 3 to 15, particularly preferably 7 to 12, very particularly preferably 9 to 10 Si, 1 to 3.5, preferably 2 to 3.5 Fe, 0.05 to 5.0, preferably 0.05 to 1, 5, particularly preferably 0, 11 to 0.6, alkali and / or alkaline earth metals, the radical AI and unavoidable impurities (all figures in wt .-%).
- alkali metals and / or alkaline earth metals are preferably magnesium, calcium and / or lithium, particularly preferably magnesium.
- the coating can be carried out by a fire coating, an electrolytic coating or by means of a piece coating process.
- the present invention therefore preferably relates to the method according to the invention, wherein the coating takes place by means of a fire coating, an electrolytic coating or by means of a piece coating process.
- the application of the aluminum-silicon-iron alloy preferably takes place by means of a continuous fire-coating process.
- the temperature of the aluminum melt bath is between 660 ° C and 720 ° C.
- Silicon in the coating acts as a diffusion blocker and serves to calm the melt bath when applying the coating formed from the aluminum alloy by means of fire coating.
- the thickness of the coating according to the invention is preferably 5 to 60 ⁇ , preferably 10 to 40 ⁇ .
- the present invention therefore preferably relates to the method according to the invention, wherein the coating weight of the double-sided coating is 20 to 240 g / m 2 .
- the coating can be present on one side of the flat steel product or on both sides of the flat steel product.
- the present invention therefore preferably relates to the method according to the invention, wherein the coating is present on one side of the flat steel product or on both sides of the flat steel product.
- the flat steel product provided in step (A) of the process according to the invention has a rolling degree sheet thickness ratio of 0.8 to 200, preferably greater than 0.8 to 180, particularly preferably greater than 0.8 to 150.
- the flat steel product provided according to the invention preferably has a rolling degree of from 0.5 to 75%, more preferably from 2.5 to 60%.
- the degree of rolling is given in% according to the invention.
- a flat steel product is used in step (A), which has areas which are rolled to a smaller sheet thickness than other areas.
- the largest available degree of rolling is used for the respective component.
- the dimensionless Abwalzgrad-sheet thickness ratio (WGB) is determined according to the invention according to the following formula (3): wherein the sheet thickness is set in mm and is identical to h v of the final thickness of the flat steel product after rolling.
- the flat steel products used in step (A) of the process according to the invention are preferably in a sheet thickness (final thickness of 0.5 to 6 mm, more preferably 0.8 to 3 mm).
- the coated flat steel product from step (A), after which process step (B) has been carried out is converted directly into the process step (C) according to the invention.
- steps (A) and (B) or (C) further steps are carried out, for example separation of areas, in particular sheets or blanks of the flat steel product, for example by shearing or laser cutting, introducing holes by laser processing or punching, and / or previous heat treatments to alter the properties of the coating or substrate.
- Step (B) of the method according to the invention comprises the determination comprises the determination of a WOP value as a function of the rolling degree-sheet thickness ratio WGB within a surface spanned by straight connecting lines between the points Pl l (WGB 0.8, WOP 100) and P 13 (WGB 0.8, WOP 800), P 13 (WGB 0.8, WOP 800) and P21 (WGB 26, WOP 650), P21 (WGB 26, WOP 650) and P41 (WGB 74, WOP 590), P41 (WGB 74, WOP 590) and P53 (WGB 150, WOP 520), P53 (WGB 150, WOP 520) and P51 (WGB 150, WOP 100) as well as P51 (WGB 150, WOP 100) and P ll (WGB 0.8, WOP 100) in a coordinate system in which the WOP value on the y-axis and the Abwalzgrad-sheet thickness ratio are plotted on the x-axis, as preferably shown in Figure 1.
- a suitable WOP value range is determined, from which in turn a WOP value can be selected. According to the invention, however, all WOP values lying in the specific WOP value range fulfill the condition that a steel component with a content of diffusible hydrogen of not more than 0.4 ppm is obtained.
- Step (B) of the process according to the invention serves to determine a WOP value as a function of the rolling degree / thickness ratio of the steel flat product used, where WOP means "hydrogen-related furnace parameter" and is unitless.
- WOP value then provides information about which Sawparame- tern the heat treatment in step (C) should be done so that steel components are obtained with levels of diffusible hydrogen of not more than 0.4 ppm.
- an area for matching WOP values is determined by the rolling degree-sheet thickness ratio. From this range, it is then possible to select a WOP value, which is then used to determine the value corresponding to the equation of the general formula (I) for T 0 fen, and T dew point . In general, however, all values present in the correspondingly determined range of WOP values are suitable for being inserted into the equation of general formula (I) in order to determine corresponding values for T 0 f en , dead and T dew point.
- Step (B) of the method according to the invention is preferably carried out in that the WOP value is spanned within a surface by straight connecting paths between the points P II (WGB 0.8, WOP 100) and P 13 (WGB 0.8, WOP 800), P13 (WGB 0.8, WOP 800) and P21 (WGB 26, WOP 650), P21 (WGB 26, WOP 650) and P41 (WGB 74, WOP 590), P41 (WGB 74, WOP 590) and P53 (WGB 150, WOP 520), P53 (WGB 150, WOP 520) and P51 (WGB 150, WOP 100) and P51 (WGB 150, WOP 100) and P ll (WGB 0.8, WOP 100) in a coordinate system in which the WOP value on the y-axis and the Abwalzgrad-sheet thickness ratio are plotted on the x-axis, is determined graphically to a predetermined Abwalzgrad-sheet thickness ratio (area A).
- the corresponding diagram
- the determination of the WOP value according to step (B) of the method according to the invention is carried out within a surface by straight connecting paths between the points P12 (WGB 0.8, WOP 300) and P 13 (WGB 0, 8, WOP 800), P13 (WGB 0.8, WOP 800) and P21 (WGB 26, WOP 650), P21 (WGB 26, WOP 650) and P41 (WGB 74, WOP 590), P41 (WGB 74, WOP 590) and P53 (WGB 150, WOP 520), P53 (WGB 150, WOP 520) and P52 (WGB 150, WOP 200), P52 (WGB 150, WOP 200) and P32 (WGB 50, WOP 200), P32 ( WGB 50, WOP 200) and P33 (WGB 50, WOP 300) and P33 (WGB 50, WOP 300) and P12 (WGB 0.8, WOP 300) in a coordinate system in which the WOP value is on the
- step (B) of the method WOP value can then be determined according to the invention, at which dew point of the furnace atmosphere T TaupU nkt, at which mean furnace temperature T 0 fen and for which duration t 0 f en step (C) of the invention Procedure is performed.
- the furnace temperature T 0 f en (in K) is the average temperature prevailing in the furnace in step (C) of the process of the invention. According to the invention can take any value 0 f s T, the holding one skilled appropriate.
- T 0 f en AC1 to 1373 K preference is given to T 0 f en AC1 to 1373 K, preferably 1113 to 1253 K, more preferably 1133 to 1223 K, most preferably 1153 to 1193 K.
- AC1 means the first austenitizing temperature, which is dependent on the alloy composition.
- the duration t 0 f en (in h) is the time over which the said furnace temperature T 0 f en prevails in step (C).
- t 0 f en can assume any value which a person skilled in the art considers suitable.
- t 0 f en describes in particular the period in which the flat steel product is moved through a continuous furnace or dwells in a stationary furnace.
- inventive process is preferably 0 t f s 0.05 to 0.5 h, preferably from 0.067 to 0.25 h, particularly preferably 0.067 to 0.4 h.
- the dew point temperature of the furnace T TaU point (in K) is for example 243, 15 to 333, 15 K, preferably 253, 15 to 303, 15 K, particularly preferably 263, 15 to 293, 15 K.
- the dew point temperature of the furnace atmosphere of the furnace T dew point , duration t 0 f en and WOP value are used to calculate the oven temperature ⁇ 0 ⁇ by means of equation (1) and then set it.
- the dew point temperature of the furnace atmosphere of the furnace T dew point, furnace temperature T 0 fen and WOP value are used to calculate and then set the duration t 0 f en by means of equation (1).
- Step (C) of the process according to the invention can generally be carried out in any oven known to the person skilled in the art, for example roller hearth furnaces, chamber furnaces, multilayer chamber furnaces, walking beam furnaces.
- Step (D) of the process according to the invention comprises forming the heated flat steel product from step (C) in a mold while simultaneously cooling to obtain the steel component.
- step (D) of the process according to the invention all processes known to the person skilled in the art can be used for hot forming, for example described in hot forming in automotive engineering - processes, materials, surfaces, Landsberg / Lech: Verl. Moderne Industrie, 2012, Die reference of the technique.
- step (D) of the process according to the invention the desired steel component is obtained from the flat steel product from step (C) by forming. So that the desired hardness structure, for example at least 80% martensite, the remainder bainite, ferrite and retained austenite, is formed in the steel component, the forming takes place with simultaneous cooling.
- the cooling in step (C) of the process according to the invention is preferably carried out at a rate of 27 to 1000 K / s, more preferably 50 to 500 K / s.
- the present invention therefore preferably relates to the process according to the invention, wherein the cooling in step (D) takes place at a cooling rate of 27 to 500 K / s.
- the present invention also relates to a steel component containing (all data in% by weight)
- From 0.06 to 0.50 preferably from 0.18 to 0.37, particularly preferably from 0.20 to 0.25 C,
- 0.10 to 0.50 preferably 0.15 to 0.40, particularly preferably 0.20 to 0.30 Si,
- Remainder Fe and unavoidable impurities containing a coating (all figures in% by weight)
- the coating weight of the coating on both sides of the steel component according to the invention is from 20 to 240 g / m 2 .
- the steel component according to the invention preferably has an alloyed alloy layer between steel substrate and Al-based coating.
- the steel component according to the invention has a fully alloyed layer in a thickness of 5 to 60 ⁇ , preferably 10 to 45 ⁇ , on.
- the thickness of the alloy layer can be measured by methods known to the person skilled in the art (for example according to DIN EN ISO 1463).
- the details and preferred embodiments mentioned with regard to the method according to the invention apply correspondingly to the steel component according to the invention.
- the present invention also relates to the use of a coated steel component according to the invention in the automotive sector, in particular as a bumper support / reinforcement, door reinforcement, B-pillar reinforcement, A-pillar reinforcement, roof frame or sill.
- a coated steel component according to the invention in the automotive sector, in particular as a bumper support / reinforcement, door reinforcement, B-pillar reinforcement, A-pillar reinforcement, roof frame or sill.
- Figures Figure 1 shows a diagram in which the WOP value is plotted against the Abwalzgrad-sheet thickness ratio. Mean in it
- FIG. 2 shows by way of example how, according to the invention, the WOP value is determined with a known rolling degree / thickness ratio, thereby
- Sheets are used which have been obtained from melts with the alloying ingredients according to Table 1.
- Table 1 Melt composition of the steel flat products used
- the flat steel products used have a coating containing 9 to 10 wt .-% Si, 2 to 3.5 wt .-% iron, balance aluminum and the amount mentioned in Table 2 Mg.
- Pad weight, sheet thickness and rolling degree of the flat steel products used are also mentioned in Table 2.
- the corresponding WOP value is then determined in the diagram according to FIG. 1 via the rolling degree-sheet thickness ratio (formula 3), and then T 0 f en , dead and T Ta u P inkt of the furnace atmosphere are determined via formula (1) and set.
- the heated flat steel product is then removed from the oven and, after a transport time of 6 seconds, placed in a mold.
- a WOP value of 300 to 630 can be read from FIG. 1 or calculated using the specified points.
- the steel component produced according to the invention has a low tendency to hydrogen-induced fractures at load voltages and can therefore be used advantageously in the automotive sector, aircraft construction or rail vehicle construction.
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Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23165955.8A EP4223889B1 (de) | 2017-10-19 | 2018-10-11 | Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017218704.2A DE102017218704A1 (de) | 2017-10-19 | 2017-10-19 | Verfahren zur Herstellung eines mit einem metallischen, vor Korrosion schützenden Überzug versehenen Stahlbauteils |
| PCT/EP2018/077692 WO2019076720A1 (de) | 2017-10-19 | 2018-10-11 | Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils |
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| EP23165955.8A Division EP4223889B1 (de) | 2017-10-19 | 2018-10-11 | Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils |
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| Publication Number | Publication Date |
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| EP3697936A1 true EP3697936A1 (de) | 2020-08-26 |
| EP3697936B1 EP3697936B1 (de) | 2023-04-12 |
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| EP18804228.7A Active EP3697936B1 (de) | 2017-10-19 | 2018-10-11 | Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils |
| EP23165955.8A Active EP4223889B1 (de) | 2017-10-19 | 2018-10-11 | Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils |
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| EP23165955.8A Active EP4223889B1 (de) | 2017-10-19 | 2018-10-11 | Verfahren zur herstellung eines mit einem metallischen, vor korrosion schützenden überzug versehenen stahlbauteils |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US11739393B2 (de) |
| EP (2) | EP3697936B1 (de) |
| CN (1) | CN110997951B (de) |
| DE (1) | DE102017218704A1 (de) |
| ES (1) | ES2948290T3 (de) |
| PL (1) | PL3697936T3 (de) |
| WO (1) | WO2019076720A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| MX2021014851A (es) | 2019-06-03 | 2022-01-18 | Thyssenkrupp Steel Europe Ag | Metodo de fabricacion de un componente de lamina metalica a partir de un producto de acero plano provisto de un revestimiento anticorrosivo. |
| DE102020114053B4 (de) | 2020-05-26 | 2022-07-14 | Audi Aktiengesellschaft | Prozessanordnung zur Herstellung eines warmumgeformten und pressgehärteten Stahlblechbauteils |
| EP3964602A1 (de) * | 2020-09-02 | 2022-03-09 | ThyssenKrupp Steel Europe AG | Verfahren zum herstellen eines blechbauteils durch warmumformen eines mit einer korrosionsschutzbeschichtung versehenen stahlflachprodukts |
| EP4174207A1 (de) | 2021-11-02 | 2023-05-03 | ThyssenKrupp Steel Europe AG | Stahlflachprodukt mit verbesserten verarbeitungseigenschaften |
| EP4461830B1 (de) * | 2022-01-06 | 2026-04-22 | Nippon Steel Corporation | Stahlblech zum heissprägen, verfahren zur herstellung eines stahlblechs zum heissprägen und heissprägeformkörper |
| CN118510928A (zh) * | 2022-01-06 | 2024-08-16 | 日本制铁株式会社 | 热冲压用钢板、热冲压用钢板的制造方法及热冲压成形体 |
| EP4283003A1 (de) * | 2022-05-24 | 2023-11-29 | ThyssenKrupp Steel Europe AG | Verfahren zum herstellen eines blechformteils |
| DE102023114525A1 (de) | 2023-06-02 | 2024-12-05 | Thyssenkrupp Steel Europe Ag | Stahlflachprodukt mit unterschiedlichen Dicken |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2780984B1 (fr) | 1998-07-09 | 2001-06-22 | Lorraine Laminage | Tole d'acier laminee a chaud et a froid revetue et comportant une tres haute resistance apres traitement thermique |
| JP2006051543A (ja) * | 2004-07-15 | 2006-02-23 | Nippon Steel Corp | 冷延、熱延鋼板もしくはAl系、Zn系めっき鋼板を使用した高強度自動車部材の熱間プレス方法および熱間プレス部品 |
| EP2010690B1 (de) | 2006-04-26 | 2010-02-24 | ThyssenKrupp Steel Europe AG | Verfahren zum schmelztauchbeschichten eines stahlflachproduktes aus höherfestem stahl |
| KR101008042B1 (ko) * | 2009-01-09 | 2011-01-13 | 주식회사 포스코 | 내식성이 우수한 알루미늄 도금강판, 이를 이용한 열간 프레스 성형 제품 및 그 제조방법 |
| WO2010085983A1 (en) * | 2009-02-02 | 2010-08-05 | Arcelormittal Investigacion Y Desarrollo S.L. | Fabrication process of coated stamped parts and parts prepared from the same |
| KR101829854B1 (ko) | 2011-04-01 | 2018-02-20 | 신닛테츠스미킨 카부시키카이샤 | 도장 후 내식성이 우수한 핫 스탬핑 성형된 고강도 부품 및 그 제조 방법 |
| WO2013047820A1 (ja) * | 2011-09-30 | 2013-04-04 | 新日鐵住金株式会社 | 溶融亜鉛めっき鋼板及びその製造方法 |
| CA2865910C (en) * | 2012-03-07 | 2017-10-17 | Nippon Steel & Sumitomo Metal Corporation | Steel sheet for hot stamping, method for production thereof, and hot stamping steel material |
| EP2848709B1 (de) | 2013-09-13 | 2020-03-04 | ThyssenKrupp Steel Europe AG | Verfahren zum Herstellen eines mit einem metallischen, vor Korrosion schützenden Überzug versehenen Stahlbauteils und Stahlbauteil |
| EP2924141B1 (de) | 2014-03-25 | 2017-11-15 | ThyssenKrupp Steel Europe AG | Kaltgewalztes Stahlflachprodukt und Verfahren zu seiner Herstellung |
| DE102014109943B3 (de) | 2014-07-16 | 2015-11-05 | Thyssenkrupp Ag | Stahlprodukt mit einer Korrosionsschutzbeschichtung aus einer Aluminiumlegierung sowie Verfahren zu dessen Herstellung |
| WO2016016676A1 (fr) * | 2014-07-30 | 2016-02-04 | ArcelorMittal Investigación y Desarrollo, S.L. | Procédé de fabrication de tôles d'acier, pour durcissement sous presse, et pièces obtenues par ce procédé |
| EP2993248B1 (de) * | 2014-09-05 | 2020-06-24 | ThyssenKrupp Steel Europe AG | Stahlflachprodukt mit einer Al-Beschichtung, Verfahren zu seiner Herstellung, und Verfahren zur Herstellung eines warmgeformten Bauteils |
| KR102462210B1 (ko) | 2014-10-09 | 2022-11-03 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | 냉간 압연되고 재결정 어닐링된 평강 제품 및 평강 제품의 제조 방법 |
| DE102017210201A1 (de) | 2017-06-19 | 2018-12-20 | Thyssenkrupp Ag | Verfahren zur Herstellung eines mit einem metallischen, vor Korrosion schützenden Überzug versehenen Stahlbauteils |
-
2017
- 2017-10-19 DE DE102017218704.2A patent/DE102017218704A1/de not_active Withdrawn
-
2018
- 2018-10-11 PL PL18804228.7T patent/PL3697936T3/pl unknown
- 2018-10-11 ES ES18804228T patent/ES2948290T3/es active Active
- 2018-10-11 US US16/647,894 patent/US11739393B2/en active Active
- 2018-10-11 CN CN201880049166.9A patent/CN110997951B/zh active Active
- 2018-10-11 EP EP18804228.7A patent/EP3697936B1/de active Active
- 2018-10-11 WO PCT/EP2018/077692 patent/WO2019076720A1/de not_active Ceased
- 2018-10-11 EP EP23165955.8A patent/EP4223889B1/de active Active
-
2023
- 2023-06-16 US US18/210,816 patent/US12529123B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110997951A (zh) | 2020-04-10 |
| DE102017218704A1 (de) | 2019-04-25 |
| EP3697936B1 (de) | 2023-04-12 |
| PL3697936T3 (pl) | 2023-08-14 |
| WO2019076720A1 (de) | 2019-04-25 |
| US20200216925A1 (en) | 2020-07-09 |
| US20230332262A1 (en) | 2023-10-19 |
| EP4223889A2 (de) | 2023-08-09 |
| US11739393B2 (en) | 2023-08-29 |
| EP4223889B1 (de) | 2026-03-25 |
| CN110997951B (zh) | 2021-08-24 |
| US12529123B2 (en) | 2026-01-20 |
| EP4223889A3 (de) | 2024-08-21 |
| ES2948290T3 (es) | 2023-09-07 |
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