EP1662012B1 - Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte - Google Patents

Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte Download PDF

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Publication number
EP1662012B1
EP1662012B1 EP04425879A EP04425879A EP1662012B1 EP 1662012 B1 EP1662012 B1 EP 1662012B1 EP 04425879 A EP04425879 A EP 04425879A EP 04425879 A EP04425879 A EP 04425879A EP 1662012 B1 EP1662012 B1 EP 1662012B1
Authority
EP
European Patent Office
Prior art keywords
micro
strip
steel strip
hot rolled
ratio
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.)
Revoked
Application number
EP04425879A
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English (en)
French (fr)
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EP1662012A1 (de
Inventor
Giovanni Arvedi
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.)
Individual
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Individual
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34932908&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1662012(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to AT04425879T priority Critical patent/ATE467691T1/de
Priority to DE602004027147T priority patent/DE602004027147D1/de
Priority to EP04425879A priority patent/EP1662012B1/de
Priority to ES04425879T priority patent/ES2343460T3/es
Publication of EP1662012A1 publication Critical patent/EP1662012A1/de
Application granted granted Critical
Publication of EP1662012B1 publication Critical patent/EP1662012B1/de
Revoked 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Definitions

  • the present invention relates to a low carbon micro-alloyed steel strip that shows such features that it can replace, in producing finished pieces being stamped or cut, the cold rolled strips till now used to obtain structures of reduced weight and good mechanical strength.
  • Said micro-alloyed or HSLA "High Strength Low Alloy" steels owe their name to the fact of including an addition of small quantities of niobium, vanadium, titanium and boron which hardly exceed the total quantity of 0.2%.
  • These elements instead of entering as alloying agents in the iron crystal lattice, carry out their action being combined with carbon and nitrogen in the matrix, thus forming finely dispersed carbides, nitrides and carbonitrides. These compounds contribute to the grain refining and cause the matrix hardening with their precipitation in the ferritic grains.
  • Object of the present invention is that of providing a strip of hot rolled, micro-alloyed low carbon steel with thickness ⁇ 0.7 mm which, particularly upon pickling and skinpassing, shows substantially the same metallurgical and geometrical features, as well as relating to planarity and deformability, of a cold rolled strip for producing stamped or sheared finished pieces, such as to be used as a valid substitute thereof.
  • the strip according to the present invention is preferably, although not exclusively, manufactured with in-line plants of the thin-slab type, as disclosed e.g. in WO2004/026497 in the name of the present applicant, which is schematically represented in Fig. 1 and is characterized, as set forth in claim 1, by a grain fineness better than grade 10 of ASTM E 112 standard in a percentage > 90% of the whole structure, with a ratio between yield strength and breaking strength ⁇ 70%.
  • the strip of micro-alloyed steel according to the present invention is preferably, although not exclusively, produced in thin-slab plants as schematically represented in Fig. 1 , where references is made in particular to the plant being the object of the international publication WO2004/026497 .
  • the following operating steps can be observed, downstream of the casting step: a) liquid core reduction; b) roughing step directly adjoining the continuous casting; c) heating in an induction furnace; e) finishing rolling; f) compact controlled cooling; g) coiling on a reel.
  • Such a plant is able to keep the temperature of the pre-strip (d) above 900°C in the steps preceding the final rolling.
  • the pre-strip rolling above preceding 900°C allows to keep solute in the ⁇ iron (austenitic phase) most of the micro-alloying agents by completely exploiting their function of limiting the growth of the austenitic grain and enhancing the hardening by precipitation in ferritic phase during the cooling step after the final rolling.
  • micro-alloyed steel strip according to the present invention shows a ratio between yield and tensile strength load equal or higher than 70%, as well as a good capability of being formed and cut under cold conditions.
  • the ratio between the fatigue limit due to plain flexure ( ⁇ FP ) and the yield strength ⁇ FP /R p0,2 is near to 1 and equal to 0.96, thereby constantly higher than that relating to the reference hot rolled material, comprised between 0.88 and 0.90, practically corresponding to the value of the same ratio as detected for cold rolled strips of the same grade.
  • the particular fine microstructure of these strips cause the same to be suitable for being finally cut and forming holes therein by punching, as well as the cold forming of complex shapes, in particular folds at 180° with bending radius equal to the thickness, for high strength steels having minimum warranted yield strength comprised between 275 and 700N/mm 2 .
  • the cold forming of pieces having a complex shape is made easier also by the constant profile of the strip and its parallelism with deviation of less than 0.05 mm.
  • the various steel grades have a chemical analysis comprised within the limits listed in the following Table 1: Element Content (%) C 0.04-0.08 Mn 0.15-2.0 Si 0.06-0.60 P 0.010 max S 0.010 max Cr 0.35 max Ni 0.20 max Mo 0.25 max Cu 0.20 max Nb 0.012-0.070 V 0.02-0.03 Ti ⁇ 0.11 Al 0.025-0.050 N 0.0115 max
  • the total sum of micro-alloying elements (V, Ti and Nb) does not exceed 0.2%.

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

Claims (4)

  1. Warmgewalzter mikrolegierter kohlenstoffarmer Stahlstreifen, mit einer Dicke ≥ 0,7 mm und einer feinkörnigen Mikrostruktur, wobei dessen Voraus-Streifen, stromaufwärts der abschließenden Walzung, auf einer Temperatur von ≥ 900° C gehalten wird, mit einer Dehngrenze zwischen 275 und 700 N/mm2, gekennzeichnet durch folgende chemische Zusammensetzung:
    C 0,04-0,08%, Mn 0,15-2,0%, Si 0,06-0,60%, P ≤ 0,010%, S ≤ 0,010%, Cr ≤ 0,35%, Ni ≤ 0,20%, Mo ≤ 0,25%, Cu ≤ 0,20%, Nb 0,012-0,070%, V 0,02-0,03%, Ti ≤ 0,11%, Al ≤ 0,025-0,050%, N ≤ 0,0115% mit einem Rest aus Fe sowie unvermeidbaren Verunreinigungen, wobei mindestens 90% seiner Körner eine Feinheit besser als Stufe 10 der Norm ASTM E 112 haben, und das Verhältnis zwischen Ermüdungsgrenzwert und Dehngrenze σFF/Rp0.2 ≥ 90% ist, mit dem Verhältnis zwischen Dehngrenze und Zugfestigkeit ≥ 70%.
  2. Stahlstreifen gemäß Patentanspruch 1, dadurch gekennzeichnet, dass die Dicken-Toleranzen ≤ 0,05 mm betragen.
  3. Stahlstreifen gemäß Patentanspruch 1, durch die Tatsache gekennzeichnet, dass keine Zusätze von Bor als mikrolegierendes Element enthalten sind.
  4. Stahlstreifen gemäß Patentanspruch 3, dadurch gekennzeichnet, dass die Gesamtsumme der mikrolegierenden Elemente, wie z. B. V, Ti und Nb 0,2% nicht überschreiten.
EP04425879A 2004-11-24 2004-11-24 Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte Revoked EP1662012B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT04425879T ATE467691T1 (de) 2004-11-24 2004-11-24 Streifen des warm gewalzten mikro-legierten stahls für das erhalten der fertigen stücke durch die betätigende und scherende kälte
DE602004027147T DE602004027147D1 (de) 2004-11-24 2004-11-24 Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte
EP04425879A EP1662012B1 (de) 2004-11-24 2004-11-24 Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte
ES04425879T ES2343460T3 (es) 2004-11-24 2004-11-24 Fleje de acero microaleado laminado en caliente para la obtencion de piezas acabadas mediante prensado en frio y cizallado.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425879A EP1662012B1 (de) 2004-11-24 2004-11-24 Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte

Publications (2)

Publication Number Publication Date
EP1662012A1 EP1662012A1 (de) 2006-05-31
EP1662012B1 true EP1662012B1 (de) 2010-05-12

Family

ID=34932908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425879A Revoked EP1662012B1 (de) 2004-11-24 2004-11-24 Streifen des warm gewalzten Mikro-legierten Stahls für das Erhalten der fertigen Stücke durch die betätigende und scherende Kälte

Country Status (4)

Country Link
EP (1) EP1662012B1 (de)
AT (1) ATE467691T1 (de)
DE (1) DE602004027147D1 (de)
ES (1) ES2343460T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3943210A1 (de) 2020-07-23 2022-01-26 Primetals Technologies Austria GmbH Giess-walz-verbundanlage zur herstellung eines warmgewalzten fertigbands aus einer stahlschmelze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2006336816B2 (en) 2006-01-26 2011-09-15 Giovanni Arvedi Strip of hot rolled micro-alloyed steel for obtaining finished pieces by cold pressing and shearing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562028A (en) * 1968-08-28 1971-02-09 Inland Steel Co Tough,high strength steel article
US6488790B1 (en) * 2001-01-22 2002-12-03 International Steel Group Inc. Method of making a high-strength low-alloy hot rolled steel
JP2003253381A (ja) * 2002-03-01 2003-09-10 Mitsubishi Heavy Ind Ltd 高強度低合金鋼
KR100630402B1 (ko) * 2002-03-29 2006-10-02 신닛뽄세이테쯔 카부시키카이샤 고온 강도가 우수한 고장력 강 및 그 제조 방법
ITMI20021996A1 (it) * 2002-09-19 2004-03-20 Giovanni Arvedi Procedimento e linea di produzione per la fabbricazione di nastro a caldo ultrasottile sulla base della tecnologia della bramma sottile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3943210A1 (de) 2020-07-23 2022-01-26 Primetals Technologies Austria GmbH Giess-walz-verbundanlage zur herstellung eines warmgewalzten fertigbands aus einer stahlschmelze
WO2022017690A1 (de) 2020-07-23 2022-01-27 Primetals Technologies Austria GmbH Giess-walz-verbundanlage zur herstellung eines warmgewalzten fertigbands aus einer stahlschmelze

Also Published As

Publication number Publication date
ATE467691T1 (de) 2010-05-15
DE602004027147D1 (de) 2010-06-24
ES2343460T3 (es) 2010-08-02
EP1662012A1 (de) 2006-05-31

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