EP3589487A1 - Produit semi-fini plat en acier, procédé servant à fabriquer un composant et utilisation - Google Patents

Produit semi-fini plat en acier, procédé servant à fabriquer un composant et utilisation

Info

Publication number
EP3589487A1
EP3589487A1 EP18708075.9A EP18708075A EP3589487A1 EP 3589487 A1 EP3589487 A1 EP 3589487A1 EP 18708075 A EP18708075 A EP 18708075A EP 3589487 A1 EP3589487 A1 EP 3589487A1
Authority
EP
European Patent Office
Prior art keywords
semi
layer
finished
weight
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18708075.9A
Other languages
German (de)
English (en)
Inventor
Cristina Matthey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel Europe AG, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3589487A1 publication Critical patent/EP3589487A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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 a semi-finished steel flat product comprising a first layer and at least one second layer bonded over its entire surface and cohesively to the first layer. Furthermore, the invention relates to a method for producing a component from the flat steel semi-finished product and a corresponding use.
  • Lightweight construction is an essential element in reducing vehicle weight. This can be achieved, inter alia, by the use of materials with increased strength. As the strength increases, its bending capacity tends to decrease. In order to ensure the occupant protection required for crash-relevant components despite increased strength to realize lightweight construction, it must be ensured that the materials used can convert the energy introduced by a crash by deformation. This requires a high degree of formability, especially in the crash-relevant components of a vehicle structure or seat structure.
  • component-specific conventional materials can be replaced by lighter materials with comparable properties.
  • more and more hybrid materials or composites are finding their way into the automotive industry, which are composed of two or more different materials, each material having certain properties, which are combined in the composite substantially opposing properties to improved properties in the composite material in comparison to the to achieve single, monolithic materials.
  • Composites, in particular dere from different steel alloys are known in the art, for example, from the German patent application DE 10 2008 022 709 AI.
  • steel alloys with a martensitic structure which are suitable with high (tensile) strengths (R m ), in particular for the production of cold-formed, crash-relevant components (components), have advantageous properties.
  • the applicant distributes such steel alloys under the trade name "MS- W® " as martensite phase steels, which can be made thinner in the material thickness while maintaining the same properties compared to conventional steel alloys, whereby the reduction of the material thickness has a positive influence on the weight of the component (component). Therefore, such steel alloys are ideal for the automotive industry.
  • martensite phase steels steel alloys with a substantially martensitic structure (martensite phase steels) are only conditionally coatable, in particular with a corrosion protection coating, owing to their chemical and physical properties. Since with increasing strength the deformability decreases, which is particularly at the expense of the bending angle, microcracks / cracks in the surface or in the near-surface region of the steel material can occur during forming depending on the geometry or complexity to be produced, leading in the worst case early to a component failure can.
  • the object of the present invention is to provide a semifinished steel semi-finished product with substantially improved properties, which is easy to coat and in particular has no or a lower tendency to crack during forming and in particular a higher bending angle, and to provide a method for producing a component and a corresponding use.
  • This object is achieved by a semi-finished steel flat product having the features of patent claim 1.
  • the inventor has found that by providing at least one second layer of a soft steel alloy, which at least on one side over the entire surface and cohesively with the first layer of a steel alloy with a martensitic microstructure, which a tensile strength> 1200 MPa and / or a hardness> 370 HV10 , in particular a tensile strength> 1300 MPa and / or a hardness> 400 HV10, preferably a tensile strength> 1400 MPa and / or a hardness> 435 HV10, more preferably a tensile strength> 1500 MPa and / or a hardness> 465 HV10, particularly preferably one Tensile strength> 1600 MPa and / or a hardness> 490 HV10, it can be ensured that at least one side no direct or direct contact with the first layer is possible, so that the second layer of a soft steel alloy acts as a kind of functional layer ,
  • the soft steel alloy has a tensile strength> 1200
  • the second layer or the soft steel alloy has properties that are particularly positive in terms of coating and / or deformation ability.
  • the semifinished steel semi-finished product according to the invention can thus be integrated into existing standard processes, such as roll profiling, etc., without having to make any changes in the process chain.
  • the coating tendency and / or the ability to deform is decisively determined by the properties on the surface of the semi-finished steel flat product which according to the invention are provided by the second layer as a functional layer.
  • the semi-finished steel flat product can be designed as a strip, plate or sheet-metal semi-finished product or can be made available to the further process steps.
  • the semi-finished steel flat product according to the invention has at least two layers of different steel alloys.
  • the first layer of the semifinished steel semi-finished product consists, in addition to Fe and unavoidable impurities in terms of production, of C: 0.15-0.6%, Si: 0.05-0.9%, Mn: 0.3-2.0 %, Al: 0.01 - 2.0%, Cr + Mo: to 1.5%, Nb + Ti: to 0.2%, B: to 0.02%, V: to 0.25%, Cu : to 0.2%, Ni: to 0.3%, Sn: to 0.05%, Ca: to 0.01%, As: to 0.02%, N: to 0.01%, P: to 0.06%, S: to 0.03%.
  • C is a strength-increasing alloying element and contributes to the increase in strength to increase the strength, so that a content of at least 0.15 wt .-%, preferably at least 0.2 wt .-% is present in order to achieve or set the desired strength , With higher strength and the brittleness increases, so that the content to a maximum of 0.6 wt .-%, in particular at most 0.55 wt .-%, preferably at most 0.5 wt .-%, more preferably at most 0.45 wt .-%, particularly preferably not more than 0.4 wt .-% is limited so as not to adversely affect the material properties and to ensure sufficient weldability.
  • Si is an alloying element that contributes to solid solution hardening and, depending on the content, has a positive effect on an increase in strength, so that a content of at least 0.05% by weight is present.
  • the alloying element is limited to not more than 0.9% by weight, in particular not more than 0.7% by weight, preferably not more than 0.5% by weight, in order to ensure adequate rolling properties.
  • Mn is an alloying element which contributes to hardenability and has a positive effect on the tensile strength, in particular for setting S to MnS, so that a content of at least 0.3% by weight is present.
  • the alloying element is limited to a maximum of 2.0% by weight, in particular a maximum of 1.7% by weight, preferably a maximum of 1.5% by weight, in order to ensure sufficient weldability.
  • Al contributes as an alloying element for deoxidation, wherein a content of at least 0.01 wt .-%, in particular 0.015 wt .-% is present.
  • the alloying element is limited to not more than 2.0% by weight, in particular not more than 1.0% by weight, preferably not more than 0.5% by weight, more preferably not more than 0.1% by weight, in particular to precipitates in the material substantially in the form of non-metallic oxide inclusions and / or to avoid which properties can influence.
  • the content is adjusted between 0.02 and 0.06 wt .-%.
  • Cr can also contribute to the setting of the strength, in particular to the hardenability, as a specific alloying element, with a content in particular of at least 0.05% by weight.
  • the alloying element is limited to a maximum of 1.5% by weight, in particular a maximum of 1.2% by weight, preferably a maximum of 1.0% by weight, in order to ensure sufficient weldability.
  • B can contribute to hardenability as an alloying element, in particular when N is hardened and is present at a level of in particular of at least 0.001% by weight.
  • the alloying element is limited to a maximum of 0.02% by weight, in particular to a maximum of 0.015% by weight, since higher contents have an adverse effect on the material properties and would result in a reduction of the hardness and / or strength in the material.
  • Ti and Nb may be alloyed as alloying elements singly or in combination for grain refining and / or N-setting, especially when Ti is present at a level of at least 0.005 wt%.
  • the content of Ti should be at least 3.42 * N.
  • the alloying elements are limited in combination to a maximum of 0.2 wt .-%, in particular a maximum of 0.15 wt .-%, preferably at most 0.1 wt .-%, since higher contents are disadvantageous to the material properties, in particular negative on the Toughness of the material.
  • Mo, V, Cu, Ni, Sn, Ca, As, N, P, or S are alloying elements which, individually or in combination, unless they are specifically added to set specific properties, can be counted as impurities.
  • the contents are limited to a maximum of 0.3% by weight Mo, to a maximum of 0.25% by weight V, to a maximum of 0.2% by weight Cu, to a maximum of 0.3% by weight Ni, to a maximum 0.05 wt .-% Sn, to a maximum of 0.01 wt .-% Ca, to a maximum of 0.02 wt .-% As, to a maximum of 0.01 wt .-% N, to a maximum of 0.06 wt.
  • the second layer for forming the at least one-sided functional layer on the first layer preferably consists of a microalloyed steel alloy or dual-phase steel alloy, which can be easily and conventionally coated and / or formed without effort.
  • the second layer of the semifinished steel semi-finished product consists not only of Fe and, due to its production, unavoidable impurities in% by weight of C: to 0.2%, Si: 0.01 to 0.6%, Mn: 0.1 to 2.5%, Al : 0.01 - 2.0%, Cr + Mo: to 1.4%, Nb + Ti: to 0.25%, B: to 0.02%, V: to 0.05%, Cu: to 0 , 2%, Ni: to 0.2%, Sn: to 0.05%, Ca: to 0.01%, Co: to 0.02%, N: to 0.01%, P: to 0.1 %, S: to 0.06%.
  • C as alloying element is at most 0.2% by weight, in particular at most 0.15% by weight, preferably at most 0.11% by weight, particularly preferably at most 0.09% by weight. %, where C is at least 0.001% by weight.
  • Si is an alloying element that contributes to solid solution hardening and positively affects an increase in strength, so that a content of at least 0.01 wt% is present.
  • the alloying element is limited to a maximum of 0.6% by weight, in particular a maximum of 0.5% by weight, preferably a maximum of 0.4% by weight, in order to ensure sufficient rollability and / or surface quality.
  • Mn is an alloying element which contributes to hardenability and has a positive effect on the tensile strength, in particular for setting S to MnS, so that a content of at least 0.1% by weight is present.
  • the alloying element is limited to a maximum of 2.5% by weight, in particular a maximum of 2.0% by weight, preferably a maximum of 1.5% by weight, in order to ensure sufficient weldability.
  • Al contributes as an alloying element for deoxidation, wherein a content of at least 0.01 wt .-%, in particular 0.015 wt .-% is present.
  • Al is alloyed in high levels in order to effect a widening of the two-phase region, the alloying element being maximally 2.0 wt. 8 wt .-%, preferably not more than 1.6 wt .-%, is limited to substantially reduce and / or avoid precipitates in the material, especially in the form of non-metallic oxidic inclusions, which can adversely affect the material properties.
  • the Al content is limited to a maximum of 1.0% by weight, in particular a maximum of 0.5% by weight, preferably a maximum of 0.2% by weight, especially in the case of microalloyed steel alloys, in order essentially to avoid the abovementioned disadvantages.
  • Cr may also contribute to adjusting the strength as alloying element, with a content in particular of at least 0.1% by weight and at most 1.4% by weight, in particular not more than 1.2% by weight, preferably maximum 1.0 wt .-%, more preferably at most 0.8 wt .-% limited in order to ensure a substantially complete coatability of the surface can.
  • the alloying element can contribute to hardenability as an alloying element, in particular when N is set and is present at a level in particular of at least 0.0002% by weight.
  • the alloying element is limited to a maximum of 0.02 wt .-%, in particular to a maximum of 0.015 wt .-%, preferably to a maximum of 0.01 wt .-%, more preferably limited to 0.005 wt .-%, since higher contents are disadvantageous to the Material properties and would result in a reduction in hardness and / or strength in the material.
  • Ti and Nb may be alloyed as alloying elements individually or in combination for grain refining and / or N-setting, with contents in particular of at least 0.001% by weight of Ti and / or of at least 0.001% by weight of Nb.
  • the content of Ti should be at least 3.42 * N.
  • the alloying elements in combination are limited to a maximum of 0.25% by weight, in particular not more than 0.2% by weight, preferably not more than 0.15% by weight, since higher contents have a disadvantageous effect on the material properties, in particular adversely on the Toughness of the material.
  • Mo, V, Cu, Ni, Sn, Ca, Co, N, P, or S are alloying elements that can be counted as impurities, singly or in combination, unless deliberately alloyed to set specific properties.
  • the contents are limited to a maximum of 0.2 wt.% Mo, to a maximum of 0.05 wt.% V, to a maximum of 0.2 wt.% Cu, to a maximum of 0.2 wt.% Ni, to a maximum of 0.05 wt .-% Sn, to a maximum of 0.01 wt .-% Ca, to a maximum of 0.02 wt .-% Co, to a maximum of 0.01 wt .-% N, to a maximum of 0.1 wt .-% P, on at most 0.06% by weight of S.
  • the semi-finished steel flat product only a first layer with a second layer connected on one side is provided in the simplest embodiment.
  • the free surface of the second layer is preferably coated with a zinc-based corrosion protection coating, wherein, in particular alternatively or additionally, the free surface of the first layer is preferably coated with a zinc-based corrosion protection coating.
  • the semifinished product comprises two second layers, which are arranged on both sides of the first layer and connected to the latter over the entire surface and by material engagement, so that a sandwich material can be provided which, depending on the application, can have a symmetrical or asymmetrical structure. Both free surfaces of the second layers may be coated with a corrosion protection coating, preferably zinc based.
  • the semi-finished steel flat product is particularly preferably provided with an electrolytic zinc coating on one or both sides.
  • the carrying out of an electrolytic coating has the advantage that the properties, in particular of the first layer, are not adversely affected, in particular by thermal influences, as occur, for example, when a hot dip coating is carried out.
  • the second layer of the soft steel alloy has a material thickness of between 2% and 30%, in particular between 5% and 20%, preferably between 7.5% and 12%, based on the total material thickness of the semi-finished steel flat product.
  • the soft steel alloy intended as a functional layer should be dimensioned in the material thickness in such a way that the positive properties of the first layer are essentially not adversely affected, with the material thickness of the second layer (per side) being a maximum of 30%, in particular a maximum of 20%.
  • the semi-finished steel flat product has a total material thickness between 0.5 and 6.0 mm, in particular between 0.8 and 4.0 mm, and preferably between 1.2 and 3.0 mm.
  • the semifinished steel semi-finished product is produced by means of plating, in particular roll cladding or by casting.
  • the semifinished steel semi-finished product according to the invention is preferably produced by means of hot-roll cladding, as disclosed, for example, in German Patent DE 10 2005 006 606 B3. Reference is made to this patent, the contents of which are hereby incorporated by reference.
  • the semi-finished steel sheet of the present invention may be produced by casting, with a possibility for its production being disclosed in Japanese Patent Laid-Open Publication JP-A-03 133 630.
  • Metallic composite fabrication is generally known in the art.
  • the invention relates to a method for producing a component for the vehicle, railway, shipbuilding or aerospace industry, wherein a semi-finished steel flat product according to the invention is cold-formed.
  • a semi-finished steel flat product according to the invention is cold-formed. Since the second layer of the semi-finished steel sheet according to the invention is particularly well deformable, for example, consists of a microalloyed or dual-phase steel alloy, so that optimum deformation properties are present and the semi-finished steel blank according to the invention are formed substantially crack-free and with a higher bending angle compared to a conventional martensite phase steel of the same composition can.
  • the cold forming of the semi-finished steel flat product according to the invention can be carried out, for example, in a discontinuous process by means of a folding or a UO molding, preferably in conventional forming tools.
  • the shaping of, for example, strip-shaped flat steel semi-finished products can be carried out inexpensively by roll profiling on preferably conventional profiling systems.
  • UO-forming or roll profiling can open or closed profiles with be made according to the requirement of different cross-sectional geometry.
  • the profiles produced can have a longitudinally constant or a longitudinally variable cross section.
  • the invention relates to a use of a manufactured profile of the semi-finished steel flat product according to the invention.
  • the profile can be used as a crash profile in a vehicle, in particular as a profile in a battery housing of a vehicle or the profile seat rail of a vehicle seat can be used.
  • the battery case includes at least a bottom, four walls, and a lid that are assembled to accommodate battery modules.
  • the walls are formed from profiles produced from the semi-finished steel flat product according to the invention.
  • the battery case is detachably connected, for example, in the bottom region of a vehicle with the body and may not or only slightly deform in a crash.
  • flat steel halves according to the invention are particularly well suited for this application, in particular if they are provided with an electrolytic zinc coating to increase the corrosion protection by the application in the wet area of the vehicle.
  • electrolytic zinc coating to increase the corrosion protection by the application in the wet area of the vehicle.
  • profiles produced from the semifinished steel semi-finished product according to the invention can also be used as longitudinal or transverse beams in the vehicle, for example as profiles, in particular as a crash profile in the bumper, sills, side impact beams or in areas in which no to small deformations / intrusions in the event of a crash are required, such as For example, in battery housings, seat structures, body, chassis, roof frame etc.
  • FIG. 1 shows a schematic section through a semifinished steel flat product according to the invention. Description of the preferred embodiment
  • the single FIGURE shows a schematic sectional illustration through a semi-finished steel flat product (1) according to the invention.
  • the semifinished steel semi-finished product (1) according to the invention comprises a first layer (1.1) of a steel alloy with a martensitic structure (martensite phase steel) which has a tensile strength> 1200 MPa and / or a hardness> 370 HV10, in particular a tensile strength> 1300 MPa and / or a hardness > 400 HV10, preferably a tensile strength> 1400 MPa and / or a hardness> 435 HV10, more preferably a tensile strength> 1500 MPa and / or a hardness> 465 HV10, particularly preferably a tensile strength> 1600 MPa and / or a hardness> 490 HV10 and two second layers (1.2, 1.2 ') of a soft steel alloy having a tensile strength ⁇ 600 MPa and / or a hardness ⁇
  • the first layer (1.1) consists, in addition to Fe and unavoidable impurities in terms of production, of C: 0.15-0.6%, Si: 0.05-0.9%, Mn: 0.3-2.0 %, Al: 0.01 - 2.0%, Cr + Mo: to 1.5%, Nb + Ti: to 0.2%, B: to 0.02%, V: to 0.25%, Cu : to 0.2%, Ni: to 0.3%, Sn: to 0.05%, Ca: to 0.01%, As: to 0.02%, N: to 0.01%, P: to 0.06%, S: to 0.03%.
  • the second layers (1.2, 1.2 ') consist not only of Fe and, in terms of production, unavoidable impurities in% by weight of C: to 0.2%, Si: 0.01 to 0.6%, Mn: 0.1 to 2.5 %, Al: 0.01 - 2.0%, Cr + Mo: to 1.4%, Nb + Ti: to 0.25%, B: to 0.02%, V: to 0.05%, Cu : to 0.2%, Ni: to 0.2%, Sn: to 0.05%, Ca: to 0.01%, Co: to 0.02%, N: to 0.01%, P: to 0.1%, S: to 0.06%, wherein they are preferably formed of a microalloyed steel alloy.
  • the material thickness of the second layer (1.2, 1.2 ') is in particular per side so dimensioned that the positive properties of the first layer (1.1) are not adversely affected substantially, the material thickness of the second layer (per side) at least 2% and at most 30%, preferably at least 7.5% and at most 12% based on the total material thickness of the semi-finished steel sheet (1), wherein the semi-finished steel sheet (1) may have, for example, a total material thickness between 0.5 and 6 mm.
  • the second layers (1.2, 1.2 ') are suitable for coating compared to the first layer (1.1) of the semifinished steel semi-finished product, they have a zinc-based corrosion protection coating on their free surfaces, preferably in each case an electrolytic zinc coating (1.3, 1.3').
  • the coating (1.3 ') is shown by dashed lines, since it is not present, for example, in the simplest embodiment of the semi-finished steel flat product (1), as already described above, in the absence of the second layer (1.2').
  • the invention is not limited to the embodiment shown in the drawing and to the statements in the general description, but rather the semi-finished steel flat product according to the invention can also be formed from a tailored product, for example a tailored blank and / or tailored roiled blank.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Transportation (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Seats For Vehicles (AREA)
  • Laminated Bodies (AREA)
  • Battery Mounting, Suspending (AREA)
  • Heat Treatment Of Steel (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

L'invention concerne un produit semi-fini plat en acier (1) comprenant : une première couche (1.1) composée d'un alliage d'acier martensitique, qui présente une résistance à la traction > 1200 MPa et/ou une dureté > 370 HV10 ; et au moins une deuxième couche (1.2, 1.2') reliée sur toute la surface et par liaison de matière à la première couche (1.1), composée d'un alliage d'acier souple, qui présente une résistance à la traction < 600 MPa et/ou une dureté < 190 HV10. L'invention concerne en outre un procédé servant à fabriquer un composant à partir du produit semi-fini plat en acier, ainsi qu'une utilisation associée.
EP18708075.9A 2017-03-03 2018-02-22 Produit semi-fini plat en acier, procédé servant à fabriquer un composant et utilisation Withdrawn EP3589487A1 (fr)

Applications Claiming Priority (2)

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DE102017203507.2A DE102017203507A1 (de) 2017-03-03 2017-03-03 Stahlflachhalbzeug, Verfahren zur Herstellung einer Komponente und Verwendung
PCT/EP2018/054372 WO2018158130A1 (fr) 2017-03-03 2018-02-22 Produit semi-fini plat en acier, procédé servant à fabriquer un composant et utilisation

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EP3589487A1 true EP3589487A1 (fr) 2020-01-08

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US (1) US20200017941A1 (fr)
EP (1) EP3589487A1 (fr)
JP (1) JP2020514547A (fr)
KR (1) KR20190126094A (fr)
CN (1) CN110392631A (fr)
DE (1) DE102017203507A1 (fr)
MX (1) MX2019010315A (fr)
WO (1) WO2018158130A1 (fr)

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LU101045B1 (en) 2018-12-11 2020-06-11 Qventis GmbH Method for the manufacture and use of a bionic hydrogel composition for medical applications
DE102018132171A1 (de) * 2018-12-13 2020-06-18 Thyssenkrupp Steel Europe Ag Batteriegehäuse und Verwendung
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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ES2709433T3 (es) 2008-05-07 2019-04-16 Thyssenkrupp Steel Europe Ag Material compuesto con efecto de protección balística
DE102008022709A1 (de) 2008-05-07 2009-11-19 Thyssenkrupp Steel Ag Verwendung eines metallischen Verbundwerkstoffs in einer Fahrzeugstruktur
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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DE102017203507A1 (de) 2018-09-06
MX2019010315A (es) 2019-10-21
CN110392631A (zh) 2019-10-29
JP2020514547A (ja) 2020-05-21
KR20190126094A (ko) 2019-11-08
WO2018158130A1 (fr) 2018-09-07
US20200017941A1 (en) 2020-01-16

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