EP3332046A1 - Acier au manganèse hautement résistant contenant de l'aluminium, procédé de fabrication d'un produit plat en acier à partir de cet acier et produit plat en acier fabriqué d'après celui-ci - Google Patents

Acier au manganèse hautement résistant contenant de l'aluminium, procédé de fabrication d'un produit plat en acier à partir de cet acier et produit plat en acier fabriqué d'après celui-ci

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Publication number
EP3332046A1
EP3332046A1 EP16747515.1A EP16747515A EP3332046A1 EP 3332046 A1 EP3332046 A1 EP 3332046A1 EP 16747515 A EP16747515 A EP 16747515A EP 3332046 A1 EP3332046 A1 EP 3332046A1
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EP
European Patent Office
Prior art keywords
steel
weight
strip
hot
slab
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
Application number
EP16747515.1A
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German (de)
English (en)
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EP3332046B1 (fr
Inventor
Peter PALZER
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Salzgitter Flachstahl GmbH
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Salzgitter Flachstahl GmbH
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Publication of EP3332046A1 publication Critical patent/EP3332046A1/fr
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • 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
    • C21D8/0221—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 characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/0221—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 characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/0247—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 characterised by the heat treatment
    • C21D8/0263—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 characterised by the heat treatment following hot rolling
    • 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
    • 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
    • C21D8/0436—Cold rolling
    • 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
    • C21D8/0447—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 heat treatment
    • C21D8/0463—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 heat treatment following hot rolling
    • 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
    • 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
    • C22C38/001—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
    • C22C38/02—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
    • C22C38/04—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
    • C22C38/06—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
    • C22C38/12—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
    • C22C38/18—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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with 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
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • 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
    • 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
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

Definitions

  • High-strength aluminum-containing manganese steel a process for producing a steel flat product from this steel and steel flat product produced therefrom
  • the invention relates to a high-strength aluminum-containing manganese steel, to a process for producing a steel flat product from this steel and to a steel flat product produced by this process.
  • European Patent Application EP 2 383 353 A2 discloses a high-strength manganese-containing steel, a flat steel product of this steel and a method for producing this flat steel product.
  • the steel consists of the elements (contents by weight and relative to the molten steel): C: up to 0,5; Mn: 4 to 12.0; Si: up to 1, 0; AI: up to 3.0; Cr: 0.1 to 4.0; Cu: up to 4.0; Ni: up to 2.0; N: up to 0.05; P: up to 0.05; S: up to 0.01; as well as the rest of iron and unavoidable impurities.
  • one or several elements from the group "V, Nb, Ti" are provided, the sum of the contents of these elements being at most 0.5.
  • This steel should be distinguished by the fact that it is cheaper to produce than high-manganese steels and at the same time high
  • a method for producing a flat steel product from the above-described high-strength manganese-containing steel includes the following
  • Output product for hot rolling is divided, or is cast into a cast strip, which is fed as a starting product to the hot rolling, - heat treating the starting product to the starting material to a
  • Hot rolling start temperature of 1 150 to 1000 ° C, - hot rolling of the starting product into a hot strip with a thickness of at most 2.5 mm, the hot rolling at a 1050 to 800 ° C amounts
  • Hot rolling end temperature is finished, - coiling the hot strip into a coil at a reel temperature of ⁇ 700 ° C.
  • the present invention the object of a high-strength aluminum-containing manganese steel with good forming properties and increased resistance to delayed cracking and Hydrogen embrittlement, a process for producing a steel flat product from this steel and to produce a steel flat product produced by this method, which offer a good combination of strength and forming properties relative to the steel.
  • a high-strength aluminum-containing manganese steel having the following chemical composition (in% by weight): C: 0.01 to ⁇ 0.3; ; Mn: 4 to ⁇ 10; AI:> 1 to 4; Si: 0.01 to 1; Cr: 0.1 to 4; Not a word; 0.02 to 1; P: ⁇ 0.1; S: ⁇ 0.1; N: ⁇ 0.3; Remainder of iron including unavoidable steel-supporting elements, with optional addition of one or more of the following elements (in% by weight): V: 0.01 to 1; Nb: 0.01 to 1; Ti: 0.01 to 1; Sn: 0 to 0.5; Cu: 0.005 to 3; W: 0.03 to 3; Co: 0.05 to 3; Zr: 0.03 to 0.5 and Ca: 0.0005 to 0.1 a good combination of strength, elongation and forming properties.
  • this manganese-containing manganese steel of the present invention (medium manganese steel) based on the alloying elements C, Mn, Cr, Al, Si and Mo is relatively inexpensive. Due to the increased Al content, the steel has a lower specific gravity compared to other low Al alloyed ones
  • Manganese steel is also characterized by increased resistance to delayed fracture and hydrogen embrittlement. This is done by excreting
  • the steel according to the invention has a multi-phase structure consisting of ferrite and / or martensite and / or bainite and retained austenite and a TRIP and / or TWIP effect.
  • the retained austenite content is 5% to 65%.
  • the retained austenite is partially or fully converted to martensite when high mechanical stresses are applied by the TRIP effect.
  • the TRIP effect increases the Elongation at break, in particular to uniform expansion, and tensile strength significantly.
  • the steel according to the invention is particularly suitable for the production of
  • high-strength heavy plate, hot and cold strip which can be provided with a metallic or non-metallic coating.
  • An application inter alia, in vehicle construction, shipbuilding, plant construction, infrastructure construction, in aerospace and home appliance technology is conceivable.
  • the steel has a tensile strength Rm of> 800 to 1700 MPa and an elongation at break A50 of 6 to 45%, preferably of> 8 to 45%.
  • a specimen A50 was used according to DIN 50 125.
  • Alloying elements are usually added to the steel in order to specifically influence certain properties.
  • An alloying element in different steels can influence different properties. The effect and interaction generally depends strongly on the amount, the presence of other alloying elements and the dissolution state in the material.
  • Carbon C needed to form carbides, stabilizes austenite and increases strength. Higher contents of C deteriorate the welding properties and lead to the deterioration of the elongation and toughness properties, therefore, a maximum content of less than 0.3 wt% is determined. In order to achieve a sufficient strength of the material, a minimum addition of 0.01 wt .-% is required.
  • Manganese Mn Stabilizes austenite, increases strength and toughness and allows for strain-induced martensite and / or twin formation in the alloy of the present invention.
  • Aluminum Al An Al content of more than 1 wt% improves strength and elongation properties, lowers specific gravity, and affects
  • Transformation behavior of the alloy according to the invention deteriorate the elongation properties. Also, higher Al contents significantly worsen the casting behavior in continuous casting. This results in a higher cost when casting. Below 4% by weight, AI retards the precipitation of carbides. Therefore, a maximum content of 4 wt .-% and a minimum content of> 1 wt .-% is set.
  • Silicon Si hinders carbon diffusion, reduces specific gravity and increases strength and elongation and toughness properties.
  • Coatability for example, by galvanizing negative. Therefore, a maximum content of 1% by weight and a minimum content of 0.01% by weight are set.
  • a maximum content of less than 1 wt .-% is set.
  • Chromium Cr Improves strength and reduces corrosion rate, retards ferrite and pearlite formation and forms carbides.
  • the maximum content is determined to be less than 4% by weight, since higher contents will result in a deterioration of the
  • Molybdenum Mo acts as a carbide former, increases strength and increases
  • Phosphorus P is a trace element from iron ore and is dissolved in the iron lattice as a substitution atom. Phosphorus increases hardness by solid solution strengthening and improves hardenability. However, it is usually tried to
  • phosphorus content is limited to less than 0.1 wt .-%.
  • Sulfur S Like phosphorus, it is bound as a trace element in iron ore. It is generally undesirable in steel as it tends to segregate and has a strong embrittlement, resulting in elongation and toughness properties
  • the sulfur content is limited to less than 0.1 wt .-%.
  • N is also a companion element of steelmaking. In the dissolved state, it improves the strength and toughness properties of steels containing more than 4% by weight of manganese-containing steels. Low Mn-alloyed steels ⁇ 4 wt .-% with free nitrogen tend to a strong aging effect. The nitrogen diffuses at low temperatures at dislocations and blocks them. It causes a rise in strength combined with a rapid increase
  • the nitrogen content is limited to less than 0.3 wt .-%.
  • Microalloying elements are usually added only in very small amounts ( ⁇ 0.1 wt .-% per element). They work in contrast to the
  • Quantity additions affect micro-alloying elements the manufacturing conditions as well as the processing and final properties strong.
  • Typical micro-alloying elements are vanadium, niobium and titanium. These elements can be dissolved in the iron grid and form carbides, nitrides and carbonitrides with carbon and nitrogen.
  • Vanadium V and niobium Nb These have a grain-refining effect, in particular due to the formation of carbides, which at the same time strength, toughness and
  • Titanium Ti As a carbide former, it refines grain, improving its strength, toughness, and elongation properties while reducing intergranular corrosion. Contents of Ti of more than 1 wt .-% deteriorate the
  • Elongation properties which is why optionally a maximum content of 1 wt .-% is determined. Minimum contents of 0.02 wt .-% may preferably be provided.
  • Tin Sn Tin increases strength but, similar to copper, accumulates at higher temperatures below the scale and grain boundaries. It leads by penetration into the grain boundaries to the formation of low-melting phases and associated with cracks in the structure and solder brittleness, which is why an optional
  • Copper Cu Reduces the corrosion rate and increases strength. Contents above 3 wt .-% deteriorate the manufacturability by forming low-melting phases during casting and hot rolling, which is why optionally a maximum content of 3 wt .-% and a minimum content of 0.005 wt .-% is set. Preferably, a minimum content of 0.5 wt .-% is provided.
  • Tungsten W acts as a carbide former and increases strength and heat resistance. Contents of W exceeding 3% by weight deteriorate the elongation properties, Therefore, optionally a maximum content of 3 wt .-% and a minimum content of 0.03 wt .-% is set. A minimum content of 0.05% by weight is preferred
  • Cobalt Co Increases the strength of the steel, stabilizes the austenite and improves the heat resistance. Contents of over 3 wt .-% worsen the
  • Elongation properties which is why optionally a maximum content of less than or equal to 3 wt .-% and a minimum content of 0.05 wt .-% is set. Preferably, a minimum content of 0.08 wt .-% is provided.
  • Zirconium Zr acts as a carbide former and improves strength. Contents of Zr of more than 0.5% by weight deteriorate the elongation properties, therefore, optionally, a maximum content of 0.5% by weight and a minimum content of 0.03% by weight are determined. Preferably, a minimum content of 0.05 wt .-% is provided.
  • Calcium Ca is used to modify non-metallic oxide inclusions, which could otherwise lead to undesirable alloy failure by inclusions in the structure which act as stress concentration sites and weaken the metal composite. Furthermore, Ca improves the
  • a process for producing a flat steel product comprises the steps:
  • V 0.01 to 1
  • Nb 0.01 to 1
  • Ti 0.01 to 1
  • Sn 0 to 0.5
  • Cu 0.005 to 3
  • W 0.03 to 3
  • Co 0.05 to 3
  • Zr 0.03 to 0.5
  • Ca 0.0005 to 0.1
  • Vorbandes in particular with a thickness of greater than 3 mm, to 1000 ° C to 1200 ° C and then hot rolling of the pre-strip to a hot strip or plate or hot rolling of the pre-strip without reheating from the
  • annealing temperature 610 to 780 ° C
  • annealing time 1 minute to 48 hours
  • Annealing temperature 610 to 780 ° C
  • annealing time 1 minute to 48 hours
  • Retained austenite content in the structure under mechanical stress has a TRIP and / or TWIP effect.
  • Hot strip is wound at a temperature of 780 ° C maximum.
  • Heavy plate bands with thicknesses above 3 mm which can certainly be wound up, for example, at a thickness of 5 mm.
  • Heavy plate with a larger thickness, for example 50 mm is tabulated after hot rolling to sheet material because it can no longer be wound. Also, if required, the hot or cold strip can be tabbed.
  • the hot-rolling temperature is between 950 ° C and Ac 1 + 50 K.
  • Typical thickness ranges for pre-strip are 1 mm to 35 mm and for slabs and thin slabs 35 mm to 450 mm.
  • the slab or thin slab is hot rolled into a hot strip or plate with a thickness of 70 mm to 1, 5 mm or hot rolled near the endabmids close cast stock is hot rolled to a hot strip with a thickness of 8 mm to 1 mm.
  • the cold strip according to the invention has a thickness of, for example, greater than 0.15 mm.
  • reheating temperatures in the range of 720 ° C to 1200 ° C are provided. If only a few rolling passes are required, the reheat temperature can be selected at the lower end of the range.
  • the hot strip as well as the heavy plate may optionally be subjected to a heat treatment in the temperature range between 610 and 780 ° C for 1 minute to 48 hours, with higher temperatures being assigned to shorter treatment times and vice versa.
  • the annealing can be done both in a bell annealing (longer annealing
  • Annealing times as well as for example in a continuous annealing (shorter annealing times) done.
  • the heat treatment can also be omitted if the hot strip or plate already has the finished performance characteristics.
  • the cold rolling of the annealed hot strip is optionally carried out with the aim of setting the thicknesses required for the end application of greater than or equal to 0.15 mm.
  • a further annealing process can be carried out optionally coupled with a coating process and finally your skin-pass process, with which the surface structure required for the end-use application is adjusted.
  • the flat steel product is hot-dip or electrolytically galvanized or metallic, inorganic or organic coated.
  • a flat steel product produced by the process according to the invention in the form of a heavy plate, hot strip or cold strip has a tensile strength Rm> 800 to 1700 MPa and an elongation at break A50 of 6 to 45%, preferably> 8 to 45%. High strengths tend to be associated with lower elongations at break and vice versa.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un acier au manganèse hautement résistant contenant de l'aluminium, ayant la composition chimique suivante (en % en poids) : C : 0,01 à < 0,3 ; Mn : 4 à < 10 ; Al : > 1 à 4 ; Si : 0,01 à 1 ; Cr : 0,1 à 4 ; Mo : 0,02 à 1 ; P : < 0,1 ; S : < 0,1 ; N : < 0,3 ; le reste étant constitué de fer et d'éléments inévitables accompagnant le fer, comprenant un ajout éventuel d'un ou de plusieurs des éléments suivants (en % en poids) : V : 0,01 à 1 ; Nb : 0,01 à 1 ; Ti : 0,01 à 1 ; Sn : 0 à 0,5 ; Cu : 0,005 à 3 ; W : 0,03 à 3 ; Co : 0,05 à 3 ; Zr : 0,03 à 0,5 et Ca : 0,0005 à 0,1, qui présente une bonne combinaison de propriétés de résistance, d'allongement et de formage. L'invention concerne également un procédé de fabrication d'un produit plat en acier à partir de cet acier et un produit plat en acier fabriqué d'après ce procédé.
EP16747515.1A 2015-08-05 2016-08-03 Acier au manganèse à haute résistance contenant de l'aluminium, procédé de fabrication d'un produit plat en acier à partir de cet acier et produit plat en acier fabriqué d'après celui-ci Active EP3332046B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015112886.1A DE102015112886A1 (de) 2015-08-05 2015-08-05 Hochfester aluminiumhaltiger Manganstahl, ein Verfahren zur Herstellung eines Stahlflachprodukts aus diesem Stahl und hiernach hergestelltes Stahlflachprodukt
PCT/EP2016/068564 WO2017021459A1 (fr) 2015-08-05 2016-08-03 Acier au manganèse hautement résistant contenant de l'aluminium, procédé de fabrication d'un produit plat en acier à partir de cet acier et produit plat en acier fabriqué d'après celui-ci

Publications (2)

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EP3332046A1 true EP3332046A1 (fr) 2018-06-13
EP3332046B1 EP3332046B1 (fr) 2021-02-24

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US (1) US20180230579A1 (fr)
EP (1) EP3332046B1 (fr)
KR (1) KR20180036731A (fr)
DE (1) DE102015112886A1 (fr)
RU (1) RU2709560C2 (fr)
WO (1) WO2017021459A1 (fr)

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DE102016110661A1 (de) * 2016-06-09 2017-12-14 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines kaltgewalzten Stahlbandes aus einem hochfesten, manganhaltigen Stahl
DE102017223633A1 (de) 2017-12-21 2019-06-27 Voestalpine Stahl Gmbh Kaltgewalztes Stahlflachprodukt mit metallischer Korrosionsschutzschicht und Verfahren zur Herstellung eines solchen
DE102018132816A1 (de) 2018-12-19 2020-06-25 Voestalpine Stahl Gmbh Verfahren zur Herstellung von thermo-mechanisch hergestellten profilierten Warmbanderzeugnissen
DE102018132901A1 (de) * 2018-12-19 2020-06-25 Voestalpine Stahl Gmbh Verfahren zur Herstellung von konventionell warmgewalzten Warmbanderzeugnissen
DE102018132860A1 (de) * 2018-12-19 2020-06-25 Voestalpine Stahl Gmbh Verfahren zur Herstellung von konventionell warmgewalzten, profilierten Warmbanderzeugnissen
DE102018132908A1 (de) 2018-12-19 2020-06-25 Voestalpine Stahl Gmbh Verfahren zur Herstellung von thermo-mechanisch hergestellten Warmbanderzeugnissen
CN111575466B (zh) * 2020-06-29 2021-10-22 张家港联峰钢铁研究所有限公司 一种热强耐蚀钢的热处理制备方法
DE102023117976A1 (de) 2022-08-23 2024-02-29 Schaeffler Technologies AG & Co. KG Elektromechanischer Aktuator
CN119256107A (zh) 2022-08-23 2025-01-03 舍弗勒技术股份两合公司 机电致动器
CN116356233A (zh) * 2023-04-11 2023-06-30 重庆大学 一种利用形变孪晶提高锆合金抗氢脆性能的方法

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RU2018107257A3 (fr) 2019-09-05
RU2018107257A (ru) 2019-09-05
US20180230579A1 (en) 2018-08-16
DE102015112886A1 (de) 2017-02-09
EP3332046B1 (fr) 2021-02-24
WO2017021459A1 (fr) 2017-02-09
KR20180036731A (ko) 2018-04-09
RU2709560C2 (ru) 2019-12-18

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