WO2025210385A1 - Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication - Google Patents

Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication

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Publication number
WO2025210385A1
WO2025210385A1 PCT/IB2024/053296 IB2024053296W WO2025210385A1 WO 2025210385 A1 WO2025210385 A1 WO 2025210385A1 IB 2024053296 W IB2024053296 W IB 2024053296W WO 2025210385 A1 WO2025210385 A1 WO 2025210385A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel sheet
temperature
heat
rolled
cold rolled
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
PCT/IB2024/053296
Other languages
English (en)
Inventor
Thomas DIEUDONNE
Edgar Alejandro PACHON RODRIGUEZ
Michel Soler
Romain BECHETER
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.)
ArcelorMittal SA
Original Assignee
ArcelorMittal SA
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 ArcelorMittal SA filed Critical ArcelorMittal SA
Priority to PCT/IB2024/053296 priority Critical patent/WO2025210385A1/fr
Priority to PCT/IB2025/052004 priority patent/WO2025210413A1/fr
Publication of WO2025210385A1 publication Critical patent/WO2025210385A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • 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
    • C21D8/0247—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
    • C21D8/0273—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
    • C21D9/46—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
    • C22C38/04—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—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
    • 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
    • C22C38/50—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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment

Definitions

  • Chromium is added in an amount of 0.1% to 1.0%. Below 0.1%, the hardenability of the steel sheet may be reduced. A maximum of 1.0% of chromium is allowed, above a saturation effect is noted, and adding chromium is both useless and expensive. Higher chromium causes surface cleaning issues during pickling process and as a result, affects coatability of the steel.
  • the chromium content is from 0.1% to 0.8%, more preferably from 0.1% to 0.5%.
  • Nickel is an important element of the invention and is added in an amount comprised from 0.05% to 0.7%. Nickel is added in substitution of a part of manganese in order to improve hydrogen embrittlement and reduce the risk of delayed fracture. Above 0.7%, a saturation effect is noted, and adding nickel is both useless and expensive.
  • the nickel content is from 0.1% to 0.7%, more preferably from 0.2% to 0.7%, even more preferably from 0.3% to 0.7%, or from 0.3% to 0.6%.
  • the sum of manganese and nickel contents is from 2.1% to 3.1%, more preferably from 2.1 % to 2.5%, even more preferably from 2.1% to 2.3%.
  • Titanium can be added optionally up to 0.06% to provide precipitation strengthening. Preferably a minimum of 0.005% of titanium is added in addition of boron to protect boron against the formation of BN.
  • Boron content can be added up to 0.005%.
  • the presence of boron can increase the toughness of the steel sheet.
  • boron improves weldability of the steel sheet. Above 0.005%, the formation of borocarbides at the prior austenite grain boundaries is promoted, making the steel more brittle.
  • Preferably a minimum of 0.0003% of boron is added.
  • the remainder of the composition of the steel is iron and unavoidable impurities resulting from the smelting process and depending on the process route.
  • the level of unavoidable impurities is very low.
  • the steel sheet can further comprise residual elements coming from such scraps such as Antimony, Arsenic, Lead, Copper, and Tin up to 0.03% which are considered as unavoidable impurities.
  • P, S and N are also part of the unavoidable impurities whatever the process route. Their content is below or equal to 0.020 % for P, below or equal to 0.010 % for S, and below or equal to 0.008 % for N.
  • a semi-product able to be further hot rolled is provided with the steel composition described above.
  • Such semi-product can for example be a slab.
  • the liquid steel can also be produced in an Electric Arc Furnace (EAF) by melting ferrous scraps to directly produce liquid steel. DRI may also be charged together with ferrous scrap in the EAF.
  • EAF Electric Arc Furnace
  • the steel sheet is heated up to a temperature TAI from 500°C to 800°C and maintaining at said TAI temperature for a holding time tAi from 1000s to 30h, in order to facilitate the cold rolling step.
  • the sheet is cooled and cold rolled to obtain a cold rolled steel sheet having a thickness that can be, for example, from 0.7 mm and 3 mm, or even better in the range of 0.8 mm to 2 mm.
  • the cold-rolling reduction ratio is preferably from 20% and 80%.
  • the cold rolled steel sheet is then heated to an annealing temperature T A 2 above or equal to Ac3, preferably from Ac3 to Ac3+150°C, and maintained at said TAS temperature for a holding time tA2 from 30s to 600s, in a furnace having an atmosphere, which can comprise for example 5%voL of H2 the rest being N2, or in a bath-salt furnace, in order to obtain a fully austenitic microstructure.
  • T A 2 above or equal to Ac3, preferably from Ac3 to Ac3+150°C, and maintained at said TAS temperature for a holding time tA2 from 30s to 600s, in a furnace having an atmosphere, which can comprise for example 5%voL of H2 the rest being N2, or in a bath-salt furnace, in order to obtain a fully austenitic microstructure.
  • the steel sheet is quenched to a temperature T Q below M s , before being reheated to a temperature T P which is from 250°C to 500°C, and maintaining at said T P temperature for a holding time tpfrom 30s to 2000s.
  • T Q below M s
  • T P which is from 250°C to 500°C
  • T P maintaining at said T P temperature for a holding time tpfrom 30s to 2000s.
  • the steel sheet is then cooled to room temperature.
  • the steel sheet can then be heated to a temperature comprised from 400 and 550°C, to ensure that the sheet undergoes the same temperature variation as in a zinc bath.
  • the steel sheet can optionally be heated to a temperature comprised from 400 and 550°C and coated with a zinc-based coating, in a bath at a temperature comprised from 400°C to 550°C.
  • T S c is from 600°C to 800°C.
  • the slow cooling is done with a cooling rate v S c from 0.5°C/s to 1 °C/s.
  • the steel sheet has a microstructure consisting of, in surface fraction, from 5% to 30% of retained austenite, the rest being partitioned martensite.
  • Partitioned martensite comes from the martensite formed during the quenching, which is then partitioned during the partitioning step at the T P temperature.
  • the steel sheet according to the invention has a good resistance to hydrogen embrittlement and delayed fracture, in particular, by satisfying the discriminant U- bending SEP1970 standard test. [038]
  • the invention will be now illustrated by the following examples, which are by no way limitative.
  • the steel sheets are annealed to a temperature TAI and maintained at said TAI temperature for a holding time tAi -
  • the steel sheets are then cooled and cold rolled with a reduction rate R.
  • the steel sheets are heated to a temperature T A 2 and maintained at said temperature for a holding time tA2.
  • the steel sheets are quenched from T A 2 to a T Q temperature, before being reheated to a partitioning temperature T P and maintained at said T P temperature for a holding time of t Pulate
  • the steel sheets are heated to 460°C, for a duration of 22s, to coat them with zinc, before being cooled to room temperature.
  • the trials 3,4, 8 and 9 are slow cooled at a cooling rate v S c from T A 2 to a temperature T S c, before being quenched to TQ.
  • phase percentages of the microstructures of the cold rolled and heat-treated steel sheet were determined, in surface fraction:
  • a section of the cold-rolled and heat-treated steel sheets are cut and bent according to U-bending SEP1970 standard test to evaluate hydrogen delayed fracture resistance of the steel. The tests are validated when no crack is formed in the sample after 720 hours.
  • the diffusible hydrogen content Hdiff is measured thanks to TDA (Thermal Desorption Analysis) experiments at the end of the manufacturing process.
  • the TDA set-up consists of a heating room in which a flat sample of 10 mm width and 50 mm length is heated in an infra-red furnace at a constant heating rate of 1200°C/h under a constant flow of pure nitrogen up to 900°C. Released hydrogen carried by nitrogen is detected by a quadrupole mass spectrometer.

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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)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention concerne une feuille d'acier laminée à froid et traitée thermiquement, constituée d'acier ayant une composition comprenant, en pourcentage en poids : de 0,30 à 0,45 % de C, de 1,0 à 3,0 % de Mn, de 0,8 à 2,5 % de Si, de 0,1 à 1,0 % de Cr, de 0,05 à 0,7 % de Mo, de 0,01 à 0,6 % d'Al, de 0,001 à 0,1 % de Nb, de 0,05 à 0,7 % de Ni, ≤ 0,020 % de P, ≤ 0 010 % de S, ≤ 0, 008 % de N et comprenant éventuellement un ou plusieurs des éléments suivants, en pourcentage en poids : ≤ 0,06 % de Ti, ≤ 0,005 % de B, le reste de la composition étant du fer et des impuretés inévitables résultant de la fusion, ladite tôle d'acier ayant une microstructure comprenant, en fraction de surface, de 5 % à 30 % d'austénite résiduelle, le reste étant de la martensite partitionnée.
PCT/IB2024/053296 2024-04-04 2024-04-04 Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication Pending WO2025210385A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB2024/053296 WO2025210385A1 (fr) 2024-04-04 2024-04-04 Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication
PCT/IB2025/052004 WO2025210413A1 (fr) 2024-04-04 2025-02-25 Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2024/053296 WO2025210385A1 (fr) 2024-04-04 2024-04-04 Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication

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WO2025210385A1 true WO2025210385A1 (fr) 2025-10-09

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PCT/IB2025/052004 Pending WO2025210413A1 (fr) 2024-04-04 2025-02-25 Tôle d'acier laminée à froid et traitée thermiquement et son procédé de fabrication

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020221889A1 (fr) * 2019-04-30 2020-11-05 Tata Steel Nederland Technology B.V. Produit en acier à haute résistance et procédé de production d'un produit en acier à haute résistance
CN113403529A (zh) * 2021-05-21 2021-09-17 鞍钢股份有限公司 冷冲压用1470MPa级合金化镀锌钢板及其制备方法
US20220333221A1 (en) * 2019-10-10 2022-10-20 Nippon Steel Corporation Cold-rolled steel sheet and method for producing same
WO2023001835A1 (fr) * 2021-07-20 2023-01-26 Voestalpine Stahl Gmbh Bande ou tôle d'acier laminée à froid à haute résistance conçue pour une utilisation dans le domaine automobile et ayant une bonne capacité de résistance à la décomposition de l'austénite résiduelle
WO2023233036A1 (fr) * 2022-06-03 2023-12-07 Thyssenkrupp Steel Europe Ag Acier laminé à froid à haute résistance présentant une sensibilité réduite à la fragilisation par l'hydrogène et son procédé de fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020221889A1 (fr) * 2019-04-30 2020-11-05 Tata Steel Nederland Technology B.V. Produit en acier à haute résistance et procédé de production d'un produit en acier à haute résistance
US20220333221A1 (en) * 2019-10-10 2022-10-20 Nippon Steel Corporation Cold-rolled steel sheet and method for producing same
CN113403529A (zh) * 2021-05-21 2021-09-17 鞍钢股份有限公司 冷冲压用1470MPa级合金化镀锌钢板及其制备方法
WO2023001835A1 (fr) * 2021-07-20 2023-01-26 Voestalpine Stahl Gmbh Bande ou tôle d'acier laminée à froid à haute résistance conçue pour une utilisation dans le domaine automobile et ayant une bonne capacité de résistance à la décomposition de l'austénite résiduelle
WO2023233036A1 (fr) * 2022-06-03 2023-12-07 Thyssenkrupp Steel Europe Ag Acier laminé à froid à haute résistance présentant une sensibilité réduite à la fragilisation par l'hydrogène et son procédé de fabrication

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