WO2025257440A1 - Micro-alloyed hot rolled strip with improved formability, up to 700 mpa - Google Patents

Micro-alloyed hot rolled strip with improved formability, up to 700 mpa

Info

Publication number
WO2025257440A1
WO2025257440A1 PCT/EP2025/066808 EP2025066808W WO2025257440A1 WO 2025257440 A1 WO2025257440 A1 WO 2025257440A1 EP 2025066808 W EP2025066808 W EP 2025066808W WO 2025257440 A1 WO2025257440 A1 WO 2025257440A1
Authority
WO
WIPO (PCT)
Prior art keywords
mpa
micro
hot rolled
rolled strip
alloyed 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
PCT/EP2025/066808
Other languages
French (fr)
Inventor
Martin SCHICKINGER
Helmut Spindler
Gottfried HRIBERNIG
Markus Sonnleitner
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl 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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Publication of WO2025257440A1 publication Critical patent/WO2025257440A1/en
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • 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
    • C21D6/02—Hardening by precipitation
    • 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
    • C21D8/0247—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
    • 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
    • C22C38/002—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
    • C22C38/02—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
    • C22C38/12—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
    • C22C38/18—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
    • C22C38/44—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
    • C22C38/46—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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C21D2211/002—Bainite
    • 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

Landscapes

  • 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)
  • Inorganic Fibers (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention relates to a steel strip or sheet comprising 0.03 – 0.12 C, 0.3 – 2.2 Mn, 0.01 – 0.1 Al, 0.0001 – 0.08 V, 0.01 – 0.10 Nb, 0.001 – 0.2 Ti, ≤ 0.60 Si, ≤ 0.4 Cr, ≤ 0.25 Ni, ≤ 0.2 Mo, ≤ 0.4 Cu, balance Fe apart from impurities, the microstructure comprising (in vol. %): polygonal ferrite (15 – 65), bainite and quasi polygonal ferrite (35– 85), pearlite (< 3), cementite (< 3), retained austenite (<1), and having a Yield strength of 250 – 700 MPa, a Hole expansion ratio (!) of ≥ 70 %,, a Tensile strength of 300 – 900 MPa, and a Total elongation of > 15 %, and the strip or sheet having a thickness of 2.0 – 6.5 mm. The invention also relates to a method of producing the strip or sheet.

Description

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° -° ° . ° . S - . S - . S - - . S . S - . S . S - . S - . S - . S S - - . . . - . °. ° ° .. ° °. °, . S S - . . ° S - °, . . . - , . . , -,,,, , .., – .: < – < < .: . . .: . .

Claims

. : .. – –. .. –.. . –. . –. . – –. .. –.. . –. . – –.. : ......... –.: . <– < < p0.2 : , , – ,, m – , , , . –.. ,. : , .. –. . –. . – –. . –.. .. –. .... . . , . : –, – < –. : , – < – . . –,. : –: . – ° ° ° –. , ° °, – ° =- - - - S - ° S - °, ,S - – ° – , –, ° –, ..S - °. , S - °
PCT/EP2025/066808 2024-06-14 2025-06-16 Micro-alloyed hot rolled strip with improved formability, up to 700 mpa Pending WO2025257440A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP24182350.9 2024-06-14
EP24182350.9A EP4663804A1 (en) 2024-06-14 2024-06-14 Micro-alloyed hot rolled strip with improved formability, up to 700 mpa

Publications (1)

Publication Number Publication Date
WO2025257440A1 true WO2025257440A1 (en) 2025-12-18

Family

ID=91581159

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2025/066808 Pending WO2025257440A1 (en) 2024-06-14 2025-06-16 Micro-alloyed hot rolled strip with improved formability, up to 700 mpa

Country Status (2)

Country Link
EP (1) EP4663804A1 (en)
WO (1) WO2025257440A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08199291A (en) * 1995-01-20 1996-08-06 Kobe Steel Ltd High strength hot rolled steel plate excellent in resistance weldability and its production
JPH08199298A (en) * 1995-01-20 1996-08-06 Kobe Steel Ltd High strength hot rolled steel plate excellent in chemical convertibility and its production
JP2009019265A (en) * 2007-06-12 2009-01-29 Nippon Steel Corp High Young's modulus steel plate excellent in hole expansibility and method for producing the same
EP3516085B1 (en) 2016-09-22 2020-07-08 Tata Steel IJmuiden B.V. A method of producing a hot-rolled high-strength steel with excellent stretch-flange formability and edge fatigue performance
EP3715491A1 (en) 2017-11-24 2020-09-30 Nippon Steel Corporation Hot-rolled steel sheet and manufacturing method therefor
EP3926064A1 (en) * 2020-06-16 2021-12-22 SSAB Technology AB High strength steel product and method of manufacturing the same
WO2021254719A1 (en) * 2020-06-16 2021-12-23 Ssab Technology Ab High strength steel product and method of manufacturing the same
KR20240011284A (en) * 2022-07-18 2024-01-26 주식회사 포스코 Hot rolled high strength steel sheet having excellent shearing quality and stretch-flangeabilty, and method for the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08199291A (en) * 1995-01-20 1996-08-06 Kobe Steel Ltd High strength hot rolled steel plate excellent in resistance weldability and its production
JPH08199298A (en) * 1995-01-20 1996-08-06 Kobe Steel Ltd High strength hot rolled steel plate excellent in chemical convertibility and its production
JP2009019265A (en) * 2007-06-12 2009-01-29 Nippon Steel Corp High Young's modulus steel plate excellent in hole expansibility and method for producing the same
EP3516085B1 (en) 2016-09-22 2020-07-08 Tata Steel IJmuiden B.V. A method of producing a hot-rolled high-strength steel with excellent stretch-flange formability and edge fatigue performance
EP3715491A1 (en) 2017-11-24 2020-09-30 Nippon Steel Corporation Hot-rolled steel sheet and manufacturing method therefor
EP3926064A1 (en) * 2020-06-16 2021-12-22 SSAB Technology AB High strength steel product and method of manufacturing the same
WO2021254719A1 (en) * 2020-06-16 2021-12-23 Ssab Technology Ab High strength steel product and method of manufacturing the same
KR20240011284A (en) * 2022-07-18 2024-01-26 주식회사 포스코 Hot rolled high strength steel sheet having excellent shearing quality and stretch-flangeabilty, and method for the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PROC. INT. CONF. ON TRIP-AIDED HIGH STRENGTH FERROUS ALLOYS, 2002, pages 61 - 64

Also Published As

Publication number Publication date
EP4663804A1 (en) 2025-12-17

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