US20200017941A1 - Flat steel semi-finished product, method for producing a component, and use thereof - Google Patents

Flat steel semi-finished product, method for producing a component, and use thereof Download PDF

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Publication number
US20200017941A1
US20200017941A1 US16/490,454 US201816490454A US2020017941A1 US 20200017941 A1 US20200017941 A1 US 20200017941A1 US 201816490454 A US201816490454 A US 201816490454A US 2020017941 A1 US2020017941 A1 US 2020017941A1
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Prior art keywords
steel product
flat steel
semifinished
semifinished flat
weight
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Cristina Matthey
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ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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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
    • 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
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/92—Making other particular articles other parts for aircraft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0233—Sheets, foils
    • B23K35/0238—Sheets, foils layered
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • 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
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • B60N2/07—Slide construction
    • B60N2/0722—Constructive details
    • 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
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • 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
    • 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
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium 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
    • 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
    • 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Definitions

  • the invention relates to embodiments of a semifinished flat steel product comprising a first layer and at least one second layer fully and cohesively bonded to the first layer.
  • the invention further relates to processes for producing a component from the semifinished flat steel product and to corresponding uses.
  • One way of saving weight is to configure or to build, for example, the bodywork, frame, seat structure and/or chassis of a vehicle, especially in the case of electrical and/or hybrid vehicles, for example even the battery housing for accommodation of battery modules for the electrical drive, in even lighter form, by means of lightweight and innovative materials compared to the materials conventionally used.
  • Conventional materials may thus be replaced by more lightweight materials having comparable properties in a component-specific manner.
  • Material composites, especially made from different steel alloys are known in the prior art, for example from German published specification DE 10 2008 022 709 A1.
  • Such steel alloys having a martensitic microstructure which, having high (tensile) strengths (R m ), are especially suitable for the production of cold-formed, crash-relevant components (component parts).
  • Such steel alloys are sold by the applicant as martensite-phase steels under the “MS-W®” trade name, which, with the same properties, can be made thinner in terms of material thickness compared to conventional steel alloys, where the reduction in material thickness can have a positive effect on the weight of the component (component part) or total weight of the vehicle.
  • Such steel alloys are therefore of excellent suitability for the automotive industry.
  • the inventor has found that it is possible, by the provision of at least a second layer of a soft steel alloy fully and cohesively bonded at least on one side to the first layer of a steel alloy having a martensitic microstructure and having a tensile strength of >1200 MPa and/or a hardness of >370 HV10.
  • the first layer of the steel alloy has a tensile strength of >1300 MPa and/or a hardness of >400 HV10, a tensile strength of >1400 MPa and/or a hardness of >435 HV10, a tensile strength of >1500 MPa and/or a hardness of >465 HV10, or even a tensile strength of >1600 MPa and/or a hardness of >490 HV10.
  • no direct contact with the first layer should be possible at least on one side when bonded to the soft steel alloy, such that the second layer of a soft steel alloy functions as a kind of functional layer.
  • the soft steel alloy has a tensile strength of ⁇ 600 MPa and/or a hardness of ⁇ 190 HV10. In some embodiments, the soft steel alloy has a tensile strength of ⁇ 550 MPa and/or a hardness of ⁇ 175 HV10, a tensile strength of ⁇ 450 MPa and/or a hardness of ⁇ 140 HV10, or even a tensile strength of ⁇ 380 MPa and/or a hardness of ⁇ 120 HV10.
  • the second layer, or the soft steel alloy has properties that have a particularly positive effect with regard to coating and/or shaping capacity.
  • the semifinished flat steel product of the invention can thus be integrated into existing standard processes, for example roll profiling, etc., without having to make changes in the process chain.
  • the propensity to coating and/or shaping capacity is determined to a crucial degree by the properties at the surface of the semifinished flat steel product, which are determined in accordance with the invention by the second layer as functional layer.
  • C is a strength-increasing alloy element and contributes to increasing strength with increasing content, and so a content of at least 0.15% by weight, and in some embodiments preferably of at least 0.2% by weight, is present in order to achieve or establish the desired strength. With higher strength, brittleness also increases, and so the content is limited to not more than 0.6% by weight. In some embodiments, it may be preferable for the C content to be limited to not more than 0.55% by weight, not more than 0.5% by weight, not more than 0.45% by weight, or even not more than 0.4% by weight, in order not to adversely affect the material properties and to ensure sufficient weldability.
  • Ti and Nb as alloy elements may be included individually or in combination in the alloy for grain refining and/or N binding, especially when Ti is present with a content of at least 0.005% by weight.
  • the content of Ti would have to be provided at an amount of at least 3.42*N.
  • the alloy elements in combination may be limited to not more than 0.2% by weight, not more than 0.15% by weight, or even not more than 0.1% by weight, since higher contents have an adverse effect on material properties, especially an adverse effect on the toughness of the material.
  • the second layer for formation of the functional layer at least on one side of the first layer preferably consists of a microalloyed steel alloy or dual-phase steel alloy that can be coated and/or formed easily and conventionally without difficulty.
  • the second layer of the semifinished flat steel product, as well as Fe and unavoidable preparation-related impurities includes, in % by weight, C: up to 0.2%, Si: 0.01-0.6%, Mn: 0.1-2.5%, Al: 0.01-2.0%, Cr+Mo: up to 1.4%, Nb+Ti: up to 0.25%, B: up to 0.02%, V: up to 0.05%, Cu: up to 0.2%, Ni: up to 0.2%, Sn: up to 0.05%, Ca: up to 0.01%, Co: up to 0.02%, N: up to 0.01%, P: up to 0.1%, S: up to 0.06%.
  • Mn is an alloy element that contributes to hardenability and has a positive effect on tensile strength, especially for binding of S to give MnS, and so a content of at least 0.1% by weight may be present.
  • the alloy element may be limited to not more than 2.5% by weight, not more than 2.0% by weight, or even not more than 1.5% by weight, in order to ensure sufficient weldability.
  • Al as an alloy element contributes to deoxidation, where a content of at least 0.01% by weight is present. In some embodiments, a content of at least 0.015% by weight is present.
  • Al is included in the alloy in high contents in order to bring about widening of the two-phase region.
  • the alloy element is limited to not more than 2.0% by weight.
  • the alloy element may be further limited to not more than 1.8% by weight, or not more than 1.6% by weight, in order to essentially reduce and/or to avoid precipitates in the material, especially in the form of nonmetallic oxidic inclusions, which can have an adverse effect on material properties.
  • the Al content, especially in the case of microalloyed steel alloys may be limited to not more than 1.0% by weight, not more than 0.5% by weight, or not more than 0.2% by weight, in order essentially to avoid the aforementioned disadvantages.
  • B as an alloy element can contribute to hardenability, especially when N is bound, and is present in a content especially of at least 0.0002% by weight.
  • the alloy element may be limited to not more than 0.02% by weight, not more than 0.015% by weight, not more than 0.01% by weight, or not more than 0.005% by weight, depending on the embodiment, since higher contents have an adverse effect on material properties and would result in a reduction in hardness and/or strength in the material.
  • Mo, V, Cu, Ni, Sn, Ca, Co, N, P or S are alloy elements which, individually or in combination, if they are not specifically included in alloys to establish specific properties, can be counted among the impurities.
  • the contents are limited to not more than 0.2% by weight of Mo, to not more than 0.05% by weight of V, to not more than 0.2% by weight of Cu, to not more than 0.2% by weight of Ni, to not more than 0.05% by weight of Sn, to not more than 0.01% by weight of Ca, to not more than 0.02% by weight of Co, to not more than 0.01% by weight of N, to not more than 0.1% by weight of P, to not more than 0.06% by weight of S.
  • first layer with a second layer bonded to one side is provided.
  • the free surface of the second layer may be coated with an anticorrosion coating based on zinc, and, in particular, alternatively or additionally, the free surface of the first layer may be coated with an anticorrosion layer based on zinc.
  • the semifinished product may include two second layers arranged on either side of and fully and cohesively bonded to the first layer, and so it is possible to provide a sandwich material which, according to the application, may have a symmetric or asymmetric construction. Both free surfaces of the second layers may be coated with an anticorrosion coating, such as a coating based on zinc.
  • the semifinished flat steel product is provided on one or both sides with an electrolytic zinc coating.
  • the performance of an electrolytic coating has the advantage that the properties of the first layer in particular are not adversely affected by thermal effects in particular, as occur, for example, in the performance of a hot dip coating operation.
  • the semifinished flat steel product is produced by means of cladding, especially roll cladding, or by means of casting.
  • the semifinished flat steel product of the invention may be preferably produced by means of hot roll cladding as disclosed, for example, in German patent specification DE 10 2005 006 606 B3, the contents of which are hereby incorporated into this application by reference.
  • the semifinished flat steel product of the invention may be produced by means of casting, in which case one option for production thereof is disclosed in Japanese published specification JP-A 03 133 630.
  • Metallic composite production is generally prior art.
  • Embodiments of the invention further relate to processes for producing a component for road vehicle construction, rail vehicle construction, shipbuilding or aerospace, wherein a semifinished flat steel product of the invention is cold-formed.
  • a semifinished flat steel product of the invention is cold-formed. Since the second layer of the semifinished flat steel product of the invention has particularly good deformability, for example consists of a microalloyed or dual-phase steel alloy, the deforming characteristics are optimal and the semifinished flat steel product of the invention can be formed in an essentially cracked-free manner and with a higher bending angle compared to a conventional martensite-phase steel of the same composition.
  • the cold forming of the semifinished flat steel product of the invention that can be provided in sheet or plate form can be effected, for example, in a discontinuous process by folding or U-O forming, preferably in conventional forming molds.
  • the forming, for example of semifinished flat steel product in strip form can be effected inexpensively by roll profiling on preferably conventional profiling plants.
  • roll profiling By the folding, U-O forming or roll profiling, it is possible to produce open or closed profiles with different cross-sectional geometry according to the requirement.
  • the profiles produced may have a longitudinally constant or longitudinally variable cross section.
  • the profile can be used as crash profile in a vehicle, especially as profile in a battery housing of a vehicle, or the profile can be used as seat rail of a vehicle seat.
  • the battery housing comprises at least one base, four walls and a lid that are assembled, and serves to accommodate battery modules. Particularly the walls are formed from profiles produced from the semifinished flat steel product according to the various embodiments of the invention.
  • the battery housing is releasably bonded to the bodywork, for example in the floor region of a vehicle, and may deform only slightly, if at all, in the event of a crash.
  • Semifinished flat steel products of the invention are of particularly good suitability for this application owing to their high tensile strength and/or hardness, especially when they are provided with an electrolytic zinc coating to increase corrosion protection due to use in the wet region of the vehicle.
  • the vehicles are preferably hybrid vehicles or purely electrically driven vehicles, whether they be personal vehicles, utility vehicles or buses.
  • profiles produced from the semifinished flat steel products of the embodiments of the invention may also be used as longitudinal or transverse beam in a motor vehicle, for example as profiles, especially as crash profile in the bumper, door sill, side impact beam, or in regions in which zero to low deformation/intrusion in the event of a crash is required, as, for example, in battery housings, seat structures, bodywork, chassis, roof frame etc.
  • the sole FIGURE shows a schematic sectional view through an inventive semifinished flat steel product ( 1 ).
  • the inventive semifinished flat steel product ( 1 ) includes a first layer ( 1 . 1 ) of a steel alloy having a martensitic microstructure (martensite-phase steel) having a tensile strength of >1200 MPa and/or a hardness of >370 HV10. As described above, the first layer ( 1 .
  • the product ( 1 ) further includes two second layers ( 1 . 2 , 1 . 2 ′) of a soft steel alloy having a tensile strength of ⁇ 600 MPa and/or a hardness of ⁇ 190 HV10.
  • each second layer may have a tensile strength of ⁇ 550 MPa and/or a hardness of ⁇ 175 HV10, a tensile strength of ⁇ 450 MPa and/or a hardness of ⁇ 140 HV10, or even a tensile strength of ⁇ 380 MPa and/or a hardness of ⁇ 120 HV10.
  • the second layers ( 1 . 2 , 1 . 2 ′) are bonded fully and cohesively to the first layer ( 1 . 1 ) on either side respectively. According to the application and in the simplest execution, it is also possible for just one second layer ( 1 . 2 ) to be fully and cohesively bonded to the first layer ( 1 . 1 ); therefore, the second layer ( 1 . 2 ′) is represented by dotted lines.
  • the first layer ( 1 . 1 ), as well as Fe and unavoidable preparation-related impurities, includes, in % by weight, C: 0.15-0.6%, Si: 0.05-0.9%, Mn: 0.3-2.0%, Al: 0.01-2.0%, Cr+Mo: up to 1.5%, Nb+Ti: up to 0.2%, B: up to 0.02%, V: up to 0.25%, Cu: up to 0.2%, Ni: up to 0.3%, Sn: up to 0.05%, Ca: up to 0.01%, As: up to 0.02%, N: up to 0.01%, P: up to 0.06%, S: up to 0.03%.
  • Fe and unavoidable preparation-related impurities include, in % by weight, C: up to 0.2%, Si: 0.01-0.6%, Mn: 0.1-2.5%, Al: 0.01-2.0%, Cr+Mo: up to 1.4%, Nb+Ti: up to 0.25%, B: up to 0.02%, V: up to 0.05%, Cu: up to 0.2%, Ni: up to 0.2%, Sn: up to 0.05%, Ca: up to 0.01%, Co: up to 0.02%, N: up to 0.01%, P: up to 0.1%, S: up to 0.06%, where they are preferably formed from a microalloyed steel alloy.
  • the material thickness of the second layer ( 1 . 2 , 1 . 2 ), especially per side, is such that the positive properties of the first layer ( 1 . 1 ) are essentially not adversely affected, where the material thickness of the second layer (per side) is at least 2% and at most 30%. In some embodiments, the material thickness of the second layer (per side) is at least 7.5% and at most 12%, based on the total material thickness of the semifinished flat steel product ( 1 ).
  • the semifinished flat steel product ( 1 ) may have, for example, a total material thickness between 0.5 and 6 mm. Since the second layers ( 1 . 2 , 1 . 2 ), by comparison with the first layer ( 1 .
  • the coating ( 1 . 3 ′) is represented by dotted lines since, for example in the simplest embodiment of the semifinished flat steel product ( 1 ) as already described further up, it is likewise absent in the absence of a second layer ( 1 . 2 ′).
  • the semifinished flat steel product of the invention may also be formed from a tailored product, for example a tailored blank and/or tailored rolled blank.
US16/490,454 2017-03-03 2018-02-22 Flat steel semi-finished product, method for producing a component, and use thereof Abandoned US20200017941A1 (en)

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DE102017203507.2A DE102017203507A1 (de) 2017-03-03 2017-03-03 Stahlflachhalbzeug, Verfahren zur Herstellung einer Komponente und Verwendung
DE102017203507.2 2017-03-03
PCT/EP2018/054372 WO2018158130A1 (de) 2017-03-03 2018-02-22 Stahlflachhalbzeug, verfahren zur herstellung einer komponente und verwendung

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DE102019116363A1 (de) 2019-06-17 2020-12-17 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Panzerungsbauteils für Kraftfahrzeuge
DE102019211064A1 (de) * 2019-07-25 2021-01-28 Thyssenkrupp Steel Europe Ag Mehrlagenverbundrohre und Mehrlagenverbundprofile aus Zwei- oder Mehrlagenverbundcoils
CN111607732A (zh) * 2020-05-22 2020-09-01 广东合一纳米材料科技有限公司 一种新型纳米中碳结构钢及其制备方法

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DE102014114365A1 (de) * 2014-10-02 2016-04-07 Thyssenkrupp Steel Europe Ag Mehrschichtiges Stahlflachprodukt und daraus hergestelltes Bauteil
DE102015114989B3 (de) * 2015-09-07 2016-09-29 Thyssenkrupp Ag Verfahren zum Herstellen einer Bauteilstruktur mit verbesserten Fügeeigenschaften und Bauteilstruktur

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