EP3927862A1 - Produit en acier constitué d'acier léger de construction contenant du manganèse, et son procédé de fabrication - Google Patents

Produit en acier constitué d'acier léger de construction contenant du manganèse, et son procédé de fabrication

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Publication number
EP3927862A1
EP3927862A1 EP20706253.0A EP20706253A EP3927862A1 EP 3927862 A1 EP3927862 A1 EP 3927862A1 EP 20706253 A EP20706253 A EP 20706253A EP 3927862 A1 EP3927862 A1 EP 3927862A1
Authority
EP
European Patent Office
Prior art keywords
steel
strip
annealing
steel product
hot
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.)
Pending
Application number
EP20706253.0A
Other languages
German (de)
English (en)
Inventor
Zacharias Georgeou
Manuel Otto
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.)
Salzgitter Flachstahl GmbH
Original Assignee
Salzgitter Flachstahl GmbH
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 Salzgitter Flachstahl GmbH filed Critical Salzgitter Flachstahl GmbH
Publication of EP3927862A1 publication Critical patent/EP3927862A1/fr
Pending legal-status Critical Current

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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties 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 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • 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
    • 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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—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
    • 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
    • C21D2211/004—Dispersions; Precipitations
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/02—Hardening by precipitation
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • the invention relates to a steel product made of manganese-containing lightweight steel with a minimum impact energy at -40 ° C. in the transverse direction of> 20 joules, preferably> 30 joules, and a process for its production in the form of a flat steel product or a seamless tube.
  • the term “armor” is also used as a synonym for such steel products.
  • steel products refers in particular to hot-rolled products such as heavy plate with thicknesses of around 3 mm to 250 mm and also hot-rolled products
  • the invention relates to the production of a steel product from a manganese-containing lightweight steel with excellent low-temperature toughness and / or high strength, in which a notch impact work in the transverse direction of at least 20 joules, preferably at least 30 joules, can be achieved even at minus 40 ° C. (TRansformation Induced Plasticity) and / or TWIP (TWinning Induced Plasticity) effect.
  • corresponding steel products should have a high energy absorption capacity at low temperatures and sudden loads, i.e. they should absorb the impact energy as completely as possible.
  • the projectile should get stuck in the armor during a fire, i.e. not penetrate through the armor.
  • the plastic deformation of the armor by an incoming projectile should not lead to excessive elongation of the steel product. But even in the event of a crash, the material should still be sufficiently tough at low temperatures.
  • the utility model DE 7138758 U discloses a bulletproof armor for Motor vehicles that consist of an outer, preferably surface-hardened
  • the laid-open specification DE 10 2016 108 278 A1 discloses a multi-layer, strip-shaped composite material made of steel with an applied thereto
  • Non-metal layer that should be bulletproof.
  • This known armor made of steel is very complex to manufacture and therefore expensive due to the additional non-metallic coatings required.
  • Safety armor for protection against fire is known, which is enriched in the edge zone on the fire side with at least 0.5 mass% with carbon and has a minimum hardness of 55 HRC on the top surface.
  • This armoring has disadvantages in particular due to the high carbon content on the firing side, which significantly reduces the weldability.
  • a lightweight structural steel containing manganese, which is said to have excellent plasticity at low temperatures down to -150 ° C., is known from laid-open specification EP 0 889 144 A1.
  • the austenitic lightweight steel has the following
  • Alloy composition in% by mass 1 to 6% Si, 1 to 8% Al with (Al + Si) £ 12%, 10 to 30% Mn, the remainder essentially iron, including the usual
  • the steel has a notched impact strength of 70 J at -196 ° C and consists of the elements (contents in% by weight and based on the
  • Molten steel C: 0.01 to 0.06; Mn: 2.0 to 8.0; Ni: 0.01 to 6.0; Mo: 0.02 to 0.6; Si: 0.03 to 0.5; AI: 0.003 to 0.05; N: 0.0015 to 0.01; P: up to 0.02; S: up to 0.01; and the remainder iron and unavoidable impurities.
  • This steel is said to be distinguished by the fact that it is more cost-effective to manufacture than the steels containing up to 9% by weight of nickel that have been used up to now for this purpose.
  • a method for producing a steel product from the above-described high-strength medium-manganese steel comprises the following work steps:
  • Reduction rate (rolling degree) of 40% or less cooling the rolled steel to a temperature of 400 ° C or less at a cooling rate of 2 ° K / sec or more, and subsequent to the cooling, tempering the steel for 0.5 hour to 4 hours at a temperature between 550 ° C and 650 ° C.
  • the structure of the steel shows as
  • Main phase martensite and 3 to 15 vol .-% residual austenite In terms of lightweight construction in combination with adequate toughness at low temperatures, this steel is not yet optimally designed.
  • the present invention is based on the object of specifying a steel product made from a manganese-containing lightweight structural steel with an increased density reduction compared to iron, which has a high
  • the steel product should be inexpensive to manufacture using a suitable method and should be an advantageous combination of strength and strength properties
  • the impact energy is determined in accordance with DIN EN ISO 148-1.
  • the steel product according to the invention is significantly reduced in density compared to known Ni-containing steels and is therefore lighter and has a stable austenite content even at low temperatures down to at least -40 ° C, which converts at the earliest when deformed at low temperatures, but is otherwise metastable to stable.
  • the steel product according to the invention can advantageously be used as a substitute for steels with a high Ni content in low-temperature applications and sudden loads, such as in the civil or military sector.
  • the optionally alloyed elements advantageously have the following contents in% by weight: Ti: 0.002 to 0.5; Cu: 0.05 to 2; B: 0.0005 to 0.014; Co: 0.003 to 3; W: 0.03 to 2; Zr: 0.03 to 1; Ca: ⁇ 0.004 and Sn: ⁇ 0.5.
  • the steel product according to the invention has a multiphase structure, consisting of at least 40% by volume, preferably at least 70% by volume, particularly preferably at least 90% by volume of austenite, less than 40% by volume, preferably less than 20% by volume % Ferrite, the rest martensite and / or carbides.
  • the carbides can be used as kappa (K) carbides and / or vanadium and / or niobium and / or molybdenum carbides are present. A minimum ferrite content of 2% by volume is preferred. It is advantageously provided that a portion of at least 0.5% of the carbides is present as kappa and / or vanadium and / or niobium and / or molybdenum carbides.
  • a part of the austenite from 5% up to 90% can be in the form of annealing or
  • the lightweight steel can optionally have both a TRIP and a TWIP effect, with part of the austenite being able to partially convert into martensite during a subsequent deformation / forming / processing of the steel strip, whereby at least 80% of the original austenite must be retained in order to achieve the To ensure low temperature properties.
  • the crystal structure of the kappa carbides is a perovskite structure in which C is octahedral surrounded by Fe and Mn and in which Al is located at the corners of the unit cell.
  • the k-phase is typically substoichiometric with respect to C and AI.
  • C leaves voids and Al is exchanged for Fe or Mn. If there is no C, this corresponds to the fcc order structure L1 2 (Fe, Mn) 3 AI).
  • the steel product according to the invention is also distinguished by an increased resistance to delayed crack formation (delayed fracture) and to hydrogen embrittlement. This is mainly achieved through the precipitation of molybdenum carbide, which acts as a hydrogen trap.
  • the steel has a high resistance to it
  • Liquid metal embrittlement (LME) during welding Liquid metal embrittlement (LME) during welding.
  • the steel according to the invention is particularly suitable for producing heavy plate or hot and cold strip, as well as components such as welded and seamless pipes, which can be provided with metallic or non-metallic, organic or other inorganic coatings.
  • the coatings can be of the same type or a mixture of several layers.
  • the steel product advantageously has a yield strength Rp0.2 of 550 to 1200 MPa, a tensile strength Rm of 670 to 1500 MPa and a
  • Elongation at break A50 of more than 25% to 80% with higher tensile strengths tending to be associated with lower elongation at break and vice versa.
  • the solution heat treatment according to the invention achieves elongation limits Rp0.2 of 550 to 750 MPa, tensile strength Rm of 670 to 860MPa and an elongation at break A50 of 67% to 80% at room temperature.
  • a steel product in the form of a flat steel product such as hot strip, cold strip, heavy plate or a component thereof, is supplied by a method comprising the steps: Method for producing a
  • C 0.1 to 1.8, preferably 0.3 to 1.5
  • Mn 15 to 35, preferably 20 to 30
  • AI 6 to 12, preferably 7 to 10
  • Si 0.2 to 1.5, preferably 0.5 to 1.2
  • Mo 0.1 to 1.2, preferably 0.5 to 1.1
  • V 0.05 to 0.5, preferably 0.07 to 0.3
  • Nb 0.01 to 0.5, preferably 0.05 to 0.3
  • Cr 0.05 to 3, preferably 0.1 to 2
  • Ni 0.05 to 3, preferably 0.1 to 2
  • P ⁇ 0.04
  • S ⁇ 0.02
  • N ⁇ 0.02
  • the end or intermediate product such as hot strip, cold strip, heavy plate or a component made from it, has a good combination of strength, elongation and deformation properties.
  • the heavy plate, hot strip, cold strip or component is heated in an annealing system at an annealing time of 10 s to 120 s, preferably 15 s to 90 s, and temperatures of 550 ° C to 850 ° C, preferably 550 ° C to 650 ° C ° C,
  • the heavy plate, hot strip, cold strip or component is advantageously solution annealed and / or age hardening annealed in an annealing plant with an atmosphere of argon or an argon-hydrogen mixture.
  • the solution heat treatment required to achieve the required low-temperature toughness and thus the setting of the final structure can not be carried out on the hot or cold strip, but optionally only after the pipe has been manufactured.
  • the tube can be given an organic or inorganic coating on one or both sides after annealing, or it can be electrolytically galvanized or hot-dip galvanized.
  • the usual thickness ranges for pre-strip are 1 mm to 35 mm and for slabs and thin slabs 35 mm to 450 mm. It is preferably provided that the slab or thin slab is hot-rolled into a heavy plate with a thickness of more than 3 mm to 200 mm or a hot strip with a thickness of 0.8 mm to 28 mm, or the pre-strip cast close to its final dimensions is hot-rolled into a hot strip with a thickness of 0.8mm to 3mm is hot rolled.
  • the cold strip according to the invention has a thickness of at most 3 mm, preferably 0.1 mm to 1.4 mm.
  • the pre-strip produced in this way as hot strip does not have an original cast structure due to the reshaping of the two counter-rotating rolls. Hot rolling thus already takes place inline during the two-roll casting process, so that separate hot rolling can optionally be omitted.
  • the cold rolling of the hot strip can take place at room temperature or advantageously at an elevated temperature before the first rolling pass, in one or more rolling passes.
  • Cold rolling at elevated temperatures is advantageous in order to reduce the rolling forces and to promote the formation of deformation twins (TWIP effect).
  • Advantageous temperatures of the rolling stock before the first rolling pass are 60 ° C to 450 ° C.
  • the cold strip can be skin-pass after cold rolling, whereby the surface structure (topography) required for the end application is set. Passing can be done, for example, using the Pretex® process.
  • the flat steel product or component produced in this way is given a surface refinement, for example by electrolytic galvanizing or hot-dip galvanizing and, instead of galvanizing or in addition, a coating on an organic or inorganic basis.
  • the coating systems can be, for example, organic coatings, plastic coatings or lacquers or other inorganic coatings such as iron oxide layers.
  • the flat steel product produced according to the invention can be used both as sheet metal,
  • Sheet metal section or blank can be used or processed into a component such as a longitudinally or spiral-welded pipe.
  • Warm forming or warm internal high pressure forming is the term used here for forming and internal high pressure forming processes in which at least the first forming step takes place at a temperature above room temperature to below the Ac3 temperature, preferably at 60 ° C to 450 ° C.
  • the lightweight steels M1 to M4 and L1 to L2 are previously solution-annealed at a temperature of 550 to 650 ° C in an annealing system with an atmosphere of argon or an argon-hydrogen mixture and then in an annealing system with an atmosphere of argon or an Argon-hydrogen mixture

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

Abstract

L'invention concerne un produit en acier constitué d'acier léger de construction contenant du manganèse, présentant une résilience minimum à -40 °C dans la direction transversale ≥ 20 joules, de préférence d'au moins 20 joules, présentant la composition chimique suivante, en pourcentage en poids : C : 0,1 à 1,8, de préférence 0,3 à 1,5 ; Mn : 15 à 35, de préférence 20 à 30 ; Al : 6 à 12, de préférence 7 à 10 ; Si : 0,2 à 1,5, de préférence 0,5 à 1,2 ; Mo : 0,1 à 1,2, de préférence 0,5 à 1,1 ; V : 0,05 à 0,5, de préférence 0,07 à 0,3 ; Nb : 0,01 à 0,5, de préférence 0,05 à 0,3 ; Cr : 0,05 à 3, de préférence 0,1 à 2 ; Ni : 0,05 à 3, de préférence 0,1 à 2 ; P : < 0,04; S : < 0,02 ; N : < 0,02 ; le reste étant du fer, y compris des éléments inévitables concomitants à l'acier, avec alliage facultatif d'un ou de plusieurs des éléments suivants : Ti, Cu, B, Co, W, Zr, Ca et Sn, présentant une structure constituée d'au moins 40 % en volume d'austénite, de moins de 40 % en volume de ferrite, le reste étant du martensite et/ou des carbures allant jusqu'à 2 %, constituées de carbures kappa et/ou de carbures de vanadium et/ou de niobium et/ou de molybdène, avec une excellente combinaison de propriétés de ténacité, d'allongement et de formage. L'invention concerne également un procédé de fabrication d'un produit en acier sous la forme d'un produit plat en acier constitué de l'acier léger de construction susmentionné, lequel contient du manganèse.
EP20706253.0A 2019-02-22 2020-02-20 Produit en acier constitué d'acier léger de construction contenant du manganèse, et son procédé de fabrication Pending EP3927862A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019104597.5A DE102019104597A1 (de) 2019-02-22 2019-02-22 Stahlprodukt aus manganhaltigem Leichtbaustahl mit hohem Energieaufnahmevermögen bei schlagartiger Beanspruchung und niedrigen Temperaturen und Verfahren zu seiner Herstellung
PCT/EP2020/054536 WO2020169764A1 (fr) 2019-02-22 2020-02-20 Produit en acier constitué d'acier léger de construction contenant du manganèse, et son procédé de fabrication

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EP3927862A1 true EP3927862A1 (fr) 2021-12-29

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US11420296B2 (en) * 2020-09-17 2022-08-23 Te-Fu FANG Welding filler wire for fusion welding precipitation-hardened austenitic Fe—Mn—Al—C alloys
CN113088823B (zh) * 2021-04-08 2022-05-17 上海富驰高科技股份有限公司 一种轻质、高强度及高耐蚀性Fe-Mn-Al-C-Cr钢及其制备方法
CN114480988B (zh) * 2021-12-27 2023-01-06 北京科技大学 一种多相复合高强高韧低密度钢及制备方法
CN114774806B (zh) * 2022-04-25 2023-05-23 燕山大学 一种高强韧轻质钢板及其制备方法和应用
CN116288020A (zh) * 2023-01-18 2023-06-23 北京理工大学 一种Fe-Mn-Al-Ni-Mo-C高强度奥氏体低密度钢及其制备方法

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DE7138758U (de) 1972-04-06 Mannesmann Ag Beschußsichere Panzerung für Kraftfahrzeuge
DE19727759C2 (de) 1997-07-01 2000-05-18 Max Planck Inst Eisenforschung Verwendung eines Leichtbaustahls
DE102005023952B9 (de) 2005-05-20 2007-07-26 Carl Aug. Picard Gmbh & Co. Kg Sicherheitspanzerung zum Schutz gegen Beschuss sowie Verfahren zu ihrer Herstellung
KR101271974B1 (ko) 2010-11-19 2013-06-07 주식회사 포스코 극저온 인성이 우수한 고강도 강재 및 그 제조방법
WO2015099221A1 (fr) * 2013-12-26 2015-07-02 주식회사 포스코 Feuille d'acier ayant une résistance élevée et une basse densité et son procédé de fabrication
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