SE547321C2 - A high strength steel strip or sheet, and a method for producing the same - Google Patents

A high strength steel strip or sheet, and a method for producing the same

Info

Publication number
SE547321C2
SE547321C2 SE2350335A SE2350335A SE547321C2 SE 547321 C2 SE547321 C2 SE 547321C2 SE 2350335 A SE2350335 A SE 2350335A SE 2350335 A SE2350335 A SE 2350335A SE 547321 C2 SE547321 C2 SE 547321C2
Authority
SE
Sweden
Prior art keywords
strip
retained austenite
steel strip
xcy
sheet according
Prior art date
Application number
SE2350335A
Other languages
Swedish (sv)
Other versions
SE2350335A1 (en
Inventor
Christoph Kickinger
Daniel Krizan
Johannes Rehrl
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
Priority to SE2350335A priority Critical patent/SE547321C2/en
Priority to EP24715482.6A priority patent/EP4689199A1/en
Priority to PCT/EP2024/057888 priority patent/WO2024200322A1/en
Priority to CN202480020803.5A priority patent/CN120898007A/en
Publication of SE2350335A1 publication Critical patent/SE2350335A1/en
Publication of SE547321C2 publication Critical patent/SE547321C2/en

Links

Classifications

    • 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
    • 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
    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering
    • 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
    • C21D8/0273—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
    • 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
    • C21D8/041—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 involving a particular fabrication or treatment of ingot or slab
    • 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
    • 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
    • C22C38/02—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
    • C22C38/14—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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C21D2211/002—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
    • C21D2211/008—Martensite

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)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention relates to a high strength steel strip or sheet comprising in wt. %: 0.15 - 0.25 C, 0.5 -1.8 Si, 2.0 - 2.7 Mn, 0.03 -1.2 Al, 0.6 - 2.0 Si Al. The strip or sheet having a tensile strength (Rm) of 980 - 1110 MPa, a microstructure including 10-25 vol% retained austenite. The retained austenite fulfil: a mechanical stability (kp) of 5 - 30, a carbon content xcy of the retained austenite of 0.8 -1.2, and RA * kp / xcy ≥ 200. The invention also relates to a method including double annealing cycle for producing the strip or sheet. (Fig. 1)

Claims (8)

1. A high strength steel strip or sheet having: a) b) d) a composition consisting of the following elements in Wt. %: C 0.15 - 0.25 Si 0.5 - 1.8 Mn 2.0 - 2.7 Al 0.03 -1.2 Si+ Al 0.6 - 2.0 Optionally Ti í 0.Nb í 0.V í 0.Cr í 0.B í 0.005 Mo í 0.balance Fe apart from impurities; a tensile strength (Rm) 980 - 1100 MPa Wherein Rm is derived according to the European norm EN 10002 Part 1, Wherein the samples are taken in the longitudinal direction of the strip; a microstructure comprising of in vol. %: retained austenite 10 - 25 Wherein the amount of retained austenite is measured by means of the saturation magnetization method described in detail in Proc. Int. Conf. on TRIP-aided high strength ferrous alloys (2002), Ghent, Belgium, p. 61-64, and the other phases are determined by use of scanning electron microscope (SEM) at 2000 times magnification; Wherein the retained austenite fulfil: 5 - 30, kp as defined by LudWigson and Berger in J. Iron Steel Inst. 1969, vol. 207, 10 pp. 63, a mechanical stability (kp) Where p=1: VVO _ Vy Vy _ ß _ kpxe V70 ...initial retained austenite content Vy ...retained austenite content after deformation s true strain; a carbon content of the retained austenite (in wt.%) xcy 0.8 -1.2, wherein xcy is determined by the formula: ay= 3.556+0.0453 xcy+ 0.00095 xMn+ 0.0056 xAi Where xMn, and xA1 are the content of manganese, and aluminium in austenite (in wt.%), and wherein the contents for xMn and xA1 are assumed to be equal the nominal content, and the lattice parameter av is obtained from the y reflections in X-ray diffraction (XRD) measurements using the following equation described in N.H. van Dijk, A.M. Butt, L. Zhao, J. Sietsma, S.E. Offerman, J .P. Wright, and S. van der Zwaag, Thermal stability of retained austenite in TRIP steels studied by synchrotron X-ray diffraction during cooling, Acta Materialia 5 3 (2005) 5439-5447; and RA * kp / xcy
2. The steel strip or sheet according to claim 1, wherein the microstructure fulfils at least one of the following requirements in vol. %, preferably all the requirements: double tempered martensite 15 - 60 tempered martensite 0 - 70 bainite 0 - 70 fresh martensite + carbides 0 - 10 bainite + tempered martensite 15 - 70 other phases 0 -
3. The steel strip or sheet according to claim 1 or 2, wherein the microstructure fulfils at least one of the following requirements in vol. %, preferably all the requirements: double tempered martensite 30 - 55 tempered martensite 10 - 40 bainite 5 - 30 fresh martensite + carbides 0 - 5 bainite + tempered martensite 25 - 50 other phases 0 -
4. The steel strip or sheet according to any one of the preceding claims, wherein one or more of the following mechanical properties are fulfilled: YS yield strength (RPM) HER Hole Expansion Ratio (Ä) TE Total Elongation (A30) TS*TE*HER/500 - 900 MPa E30% 215% 27000MPa%
5. The steel strip or sheet according to any one of the preceding claims, wherein one or more of the following mechanical properties are fulfilled: TS, Tensile Strength (Rm) YS yield strength (RPM) HER Hole Expansion Ratio (Ä) TE Total Elongation (A30) TS*TE*HER/980-1050 MPa 600-800 MPa 35 - 60 % 20 - 30 % 8000 - 12000 MPa
6. The steel strip or sheet according to any one of the preceding claims, wherein the retained austenite fulfils one or more of the following: AR ECD mechanical stability (kp) carbon content in retained austenite (xcy) RA* kp/.xcy 2 2.0 5 0.55 10-0.9 -1.1 250 -
7. The high strength steel strip or sheet according to claim 1 having a composition consisting of the following alloying elements (in wt. %): C Si Mn Al Si+ Al Optionally Ti Nb V Cr 0.17 -0.23 0.5 - 1.6 2.2 -2.6 0.03 -1.0 0.7 -1.50.1 50.1 50.1 50.B Mo S 0.005 S 0.balance Fe apart from impurities;
8. A method for producing a high strength steel strip or sheet according to any one of claims 1 - 7, comprising: g) Providing a cold ro11ed steel having a composition as defined in item a) of the claims: h) heating the strip at a rate (I-ÉRÉ) of to 1 - 20 °C/s to a first annealing temperature (Tan1) between 800 “C and 1000 °C, and soaiïirig for 10 - 300 s (ftani). i) cooling the strip at a rate (CR1) of 10 - 100 °C/s to a first quenching temperature (TQ1) between MF and (MS-20) °C, j) heating the cooled strip at a rate (HR2) of 1-100 °C/s to a first partitioning temperature (Toa1) in the range of the first quenching temperature (TQ1) + 10 °C to 500 °C, and partitioning the strip for 204000 s (toal), k) cooiiiig the strip to a teihperature below 50 °C at a rate (CRÉZ) of 1 - 50 °C/s, 1) heating the strip at a rate (HRÉ) of to 1 - 20 °C/s to a second annealing temperature (Tan2) between 700 °C, and 900 °C, and soaking for 10 - 300 s (tanfi), m) cooling the strip at a rate (CR3) of 10 - 100 °C/s to a second quenching temperature (TQ2) in the range of 150 - 500 °C, n) partitioning the strip for 20 -(toa2) at a second partitioning temperature (Toa2) in the range of the second quenching temperature (TQ2) to 500 °C. o) coohng the strip to a teniperature below 50 °C, p) optionahy' niaking sheets fittan the strips.
SE2350335A 2023-03-24 2023-03-24 A high strength steel strip or sheet, and a method for producing the same SE547321C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE2350335A SE547321C2 (en) 2023-03-24 2023-03-24 A high strength steel strip or sheet, and a method for producing the same
EP24715482.6A EP4689199A1 (en) 2023-03-24 2024-03-22 A high strength steel strip or sheet, and a method for producing the same
PCT/EP2024/057888 WO2024200322A1 (en) 2023-03-24 2024-03-22 A high strength steel strip or sheet, and a method for producing the same
CN202480020803.5A CN120898007A (en) 2023-03-24 2024-03-22 High-strength steel strips or sheets and their manufacturing methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2350335A SE547321C2 (en) 2023-03-24 2023-03-24 A high strength steel strip or sheet, and a method for producing the same

Publications (2)

Publication Number Publication Date
SE2350335A1 SE2350335A1 (en) 2024-09-25
SE547321C2 true SE547321C2 (en) 2025-07-01

Family

ID=90675377

Family Applications (1)

Application Number Title Priority Date Filing Date
SE2350335A SE547321C2 (en) 2023-03-24 2023-03-24 A high strength steel strip or sheet, and a method for producing the same

Country Status (4)

Country Link
EP (1) EP4689199A1 (en)
CN (1) CN120898007A (en)
SE (1) SE547321C2 (en)
WO (1) WO2024200322A1 (en)

Citations (4)

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Publication number Priority date Publication date Assignee Title
US20150203947A1 (en) * 2012-07-31 2015-07-23 Jfe Steel Corporation High-strength galvanized steel sheet with excellent formability and shape fixability and method for manufacturing the same
WO2020151855A1 (en) * 2019-01-22 2020-07-30 Voestalpine Stahl Gmbh Cold rolled steel sheet
WO2022259838A1 (en) * 2021-06-11 2022-12-15 Ｊｆｅスチール株式会社 High-strength steel sheet and manufacturing method therefor
WO2023001835A1 (en) * 2021-07-20 2023-01-26 Voestalpine Stahl Gmbh High strength cold rolled steel strip sheet for automotive use having good withstandability to retained austentite decomposition

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WO2017109539A1 (en) * 2015-12-21 2017-06-29 Arcelormittal Method for producing a high strength steel sheet having improved strength and formability, and obtained high strength steel sheet
KR102490989B1 (en) * 2015-12-29 2023-01-19 아르셀러미탈 Method for manufacturing ultra-high strength galvannealed steel sheet and obtained galvannealed steel sheet
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150203947A1 (en) * 2012-07-31 2015-07-23 Jfe Steel Corporation High-strength galvanized steel sheet with excellent formability and shape fixability and method for manufacturing the same
WO2020151855A1 (en) * 2019-01-22 2020-07-30 Voestalpine Stahl Gmbh Cold rolled steel sheet
WO2022259838A1 (en) * 2021-06-11 2022-12-15 Ｊｆｅスチール株式会社 High-strength steel sheet and manufacturing method therefor
WO2023001835A1 (en) * 2021-07-20 2023-01-26 Voestalpine Stahl Gmbh High strength cold rolled steel strip sheet for automotive use having good withstandability to retained austentite decomposition

Also Published As

Publication number Publication date
WO2024200322A1 (en) 2024-10-03
EP4689199A1 (en) 2026-02-11
CN120898007A (en) 2025-11-04
SE2350335A1 (en) 2024-09-25

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