EP1662011B1 - Hot rolled dual-phase steel strip having features of a cold rolled strip - Google Patents

Hot rolled dual-phase steel strip having features of a cold rolled strip Download PDF

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Publication number
EP1662011B1
EP1662011B1 EP04425878A EP04425878A EP1662011B1 EP 1662011 B1 EP1662011 B1 EP 1662011B1 EP 04425878 A EP04425878 A EP 04425878A EP 04425878 A EP04425878 A EP 04425878A EP 1662011 B1 EP1662011 B1 EP 1662011B1
Authority
EP
European Patent Office
Prior art keywords
strip
thickness
phase steel
dual phase
steel strip
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
EP04425878A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1662011A1 (en
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
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34932907&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1662011(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to SI200430998T priority Critical patent/SI1662011T1/sl
Priority to DE602004018791T priority patent/DE602004018791D1/de
Priority to PT04425878T priority patent/PT1662011E/pt
Priority to AT04425878T priority patent/ATE419399T1/de
Priority to ES04425878T priority patent/ES2316950T3/es
Priority to EP04425878A priority patent/EP1662011B1/en
Priority to DK04425878T priority patent/DK1662011T3/da
Application filed by Individual filed Critical Individual
Priority to PL04425878T priority patent/PL1662011T3/pl
Publication of EP1662011A1 publication Critical patent/EP1662011A1/en
Publication of EP1662011B1 publication Critical patent/EP1662011B1/en
Application granted granted Critical
Priority to HR20090024T priority patent/HRP20090024T3/xx
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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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 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips 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
    • 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
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • 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
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention is directed to a hot rolled dual phase steel strip, having features similar to those of a corresponding cold rolled dual phase steel strip.
  • Low carbon steel strips of the dual phase type (ferrite-martensite) are known, being cold rolled, which have special geometrical, and metallurgical features, as well as relating to planarity and deformability, so as to render the same particularly adapted to the production of pressed or cut pieces requiring very strict tolerances, particularly when designed for the car manufacturing industry with a thickness of more than 1.0 mm.
  • a basic feature for this product is in fact the tendency to be cold shaped, as well as a good mechanical resistance being fit to absorb shocks as a consequence of the crash tests recently developed in the car industry. It has been found that these steels must show a microstructure mainly formed of ferrite and, as a slightest portion, of martensite or bainite, i.e. a structure of high hardness that can be obtained by suddenly cooling the steel from an intercritic temperature comprised between 700 and 800°C.
  • this type of steel requires significant additions of chromium and phosphorous, especially the first mentioned element in order to increase the steel capacity of being hardened and to enhance the production of carbides, whereas the second mentioned element is added to make ferrite harder and cause the yield point to raise. Both elements have also the effect of increasing the tensile strength.
  • An object of the present invention is therefore that of providing a steel strip of the above-mentioned type which, unlike the other cold rolled dual phase steels being known so far, has the same features and may replace without problems a cold rolled dual phase steel strip, in particular for cold pressed or cut pieces.
  • Another object of the present invention is that of providing a steel strip that, even without important additions of chromium and phosphorous, is provided with the same qualities as mentioned, which are peculiar of the steels wherein considerable amounts of these two elements are present.
  • the strip according to the present invention is preferably, although not exclusively, produced by means of in-line plants of the thin-slab type, as disclosed in EP 0415987 in the name of the present applicant and schematically illustrated in figure 1 and is characterized, as set forth in claim 1, by a carbon content comprised between 0.06 and 0.15%, manganese between 1.0 and 2.0% and other elements within % ranges as follows: C 0.06-0.15%, Mn 1.0-2.0%, Si ⁇ 0.80%, P ⁇ 0.010%, S ⁇ 0.005%, Cr ⁇ 0.30%, Ni ⁇ 0.30%, Mo ⁇ 0.03%, Al 0.030 ⁇ 0.050%, with the balance being Fe and unavoidable impurities.
  • This strip has a chemical composition poorer than that of the strip of this type according to the prior art and shows a constant geometrical profile along the whole length, with low tolerances relating to the thickness, comparable with those typical of a cold rolled strip.
  • the dual phase steel strip according to the present invention is preferably, although not exclusively, manufactured in thin-slab plants as schematically shown in figure 1 , where reference is particularly made to the plant being the object of patent EP 0415987 .
  • the following processing steps can be distinguish therein, downstream of the continuous casting step: a) liquid core reduction; b) roughing step directly adjoining to the continuous casting; c) heating in an induction furnace; d) keeping temperature in a furnace provided with internal mandrel; e) finishing rolling; f) compact controlled cooling; and g) coiling on a reel. It has been found in fact that the particular working conditions, typical of this plant, give the final product a particularly thin and homogeneous structure with positive consequences on the chemical-physical characteristics of the final product itself.
  • the hot rolled low carbon steel strip with a dual phase structure formed of ferrite and martensite
  • the hot rolled low carbon steel strip with a dual phase structure are basically: a thickness of 1 to 8 mm with tolerances comprised between ⁇ 0.06 mm and ⁇ 0,15 mm , a parallelism ⁇ 0.05 mm and a structure with grain fineness better than grade 10 of the ASTM E 112 standard.
  • Thickness Standard Tolerances Tolerance of the strip of the invention EN 10051 EN 10031 Cold Strips Hot Tolerances Max Crown Hot Coils Standard Strict ⁇ 1.50 +/- 0.17 +/-0.11 +/-0.08 +/-0.06 0.03 1.51 - 2.00 +/-0.17 +/-0.13 +/-0.09 +/-0.07 0.04 2.01 - 2.50 +/- 0.18 +/-0.15 +/-0.11 +/-0.10 0.04 2.51-3.00 +/-0.20 +/-0.17 +/-0.12 +/-0.11 0.05 3.01-4.00 +/- 0.22 +/-0.12 0.06 4.01-5.00 +/-0.24 +/-0.12 0.06 5.01 - 6.00 +/-0.26 +/-0.12 0.07 6.01 - 8.00 +/- 0.29 +/-0.15 0.07
  • the tolerances, as detected for the hot rolled steel strip according to the present invention not only correspond on average to less than one half of the tolerances relating to the traditional hot rolled strips, but are even lower than the strict tolerances of the cold strips having the same thickness.
  • the percentage at which the chromium and phosphorous elements are present can be limited to the values stated, without any necessity of high amounts of these elements being added, although the same good qualities are maintained, thanks to the fact that the temperature of slab, pre-strip and rolled strip never goes below the critical values beyond which the chromium carbides precipitate and phosphorous is separated from the solid solution.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
EP04425878A 2004-11-24 2004-11-24 Hot rolled dual-phase steel strip having features of a cold rolled strip Revoked EP1662011B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DK04425878T DK1662011T3 (da) 2004-11-24 2004-11-24 Varmvalset bånd af tofaset stål med egenskaber som et koldvalset bånd
PT04425878T PT1662011E (pt) 2004-11-24 2004-11-24 Banda de aço dupla fase laminada a quente que tem características de banda laminada a frio
AT04425878T ATE419399T1 (de) 2004-11-24 2004-11-24 Warmgewalztes band aus dualphasenstahl mit den eigenschaften eines kaltgewalzten bandes
ES04425878T ES2316950T3 (es) 2004-11-24 2004-11-24 Chapa de acero de fase laminada en caliente provista de la caracteristicas de una chapa laminada en frio.
EP04425878A EP1662011B1 (en) 2004-11-24 2004-11-24 Hot rolled dual-phase steel strip having features of a cold rolled strip
PL04425878T PL1662011T3 (pl) 2004-11-24 2004-11-24 Walcowana na gorąco taśma ze stali dwufazowej, mająca właściwości taśmy walcowanej na zimno
SI200430998T SI1662011T1 (sl) 2004-11-24 2004-11-24 Toplo valjani dvofazni jekleni trak, ki ima značilnosti hladno valjanega traku
DE602004018791T DE602004018791D1 (de) 2004-11-24 2004-11-24 Warmgewalztes Band aus Dualphasenstahl mit den Eigenschaften eines kaltgewalzten Bandes
HR20090024T HRP20090024T3 (en) 2004-11-24 2009-01-16 Hot rolled dual-phase steel strip having features of a cold rolled strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425878A EP1662011B1 (en) 2004-11-24 2004-11-24 Hot rolled dual-phase steel strip having features of a cold rolled strip

Publications (2)

Publication Number Publication Date
EP1662011A1 EP1662011A1 (en) 2006-05-31
EP1662011B1 true EP1662011B1 (en) 2008-12-31

Family

ID=34932907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425878A Revoked EP1662011B1 (en) 2004-11-24 2004-11-24 Hot rolled dual-phase steel strip having features of a cold rolled strip

Country Status (9)

Country Link
EP (1) EP1662011B1 (pt)
AT (1) ATE419399T1 (pt)
DE (1) DE602004018791D1 (pt)
DK (1) DK1662011T3 (pt)
ES (1) ES2316950T3 (pt)
HR (1) HRP20090024T3 (pt)
PL (1) PL1662011T3 (pt)
PT (1) PT1662011E (pt)
SI (1) SI1662011T1 (pt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20120066A1 (it) * 2012-01-23 2013-07-24 Arvedi Steel Engineering S P A Procedimento e impianto per la produzione di un nastro d'acciaio bifasico laminato a caldo
AT525283B1 (de) * 2021-10-29 2023-02-15 Primetals Technologies Austria GmbH Verfahren zur Herstellung eines Dualphasenstahlbands in einer Gieß-Walz-Verbundanlage, ein mit dem Verfahren hergestelltes Dualphasenstahlband und eine Gieß-Walz-Verbundanlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6488790B1 (en) * 2001-01-22 2002-12-03 International Steel Group Inc. Method of making a high-strength low-alloy hot rolled steel

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE430902B (sv) 1979-05-09 1983-12-19 Svenskt Stal Ab Sett att vermebehandla ett stalband med 0,05 - 0,20% kolhalt och laga halter legeringsemnen
JPS57137452A (en) 1981-02-20 1982-08-25 Kawasaki Steel Corp Hot rolled high tensile steel plate having composite structure and its manufacture
JPS57137426A (en) 1981-02-20 1982-08-25 Kawasaki Steel Corp Production of low yield ratio, high tensile hot rolled steel plate by mixed structure
DE3440752A1 (de) 1984-11-08 1986-05-22 Thyssen Stahl AG, 4100 Duisburg Verfahren zur herstellung von warmband mit zweiphasen-gefuege
IT1224318B (it) * 1988-05-26 1990-10-04 Mannesmann Ag Processo ed impianto per la produzione continua di nastro di acciaio
JPH04235219A (ja) * 1991-01-08 1992-08-24 Nippon Steel Corp 極めて疲労特性に優れた複合組織熱延高張力鋼板の製造方法
CA2202616C (en) * 1994-10-20 2001-01-23 Fritz-Peter Pleschiutschnigg Process and device for producing a steel strip with the properties of a cold-rolled product
JP3538990B2 (ja) * 1995-08-31 2004-06-14 Ｊｆｅスチール株式会社 耐衝撃性に優れる高張力熱延鋼板およびその製造方法
JP3713804B2 (ja) * 1996-05-02 2005-11-09 Ｊｆｅスチール株式会社 成形性に優れる薄物熱延鋼板
NL1003293C2 (nl) * 1996-06-07 1997-12-10 Hoogovens Staal Bv Werkwijze en inrichting voor het vervaardigen van een stalen band.
JP3719007B2 (ja) * 1998-08-12 2005-11-24 Ｊｆｅスチール株式会社 厚物２相組織熱延鋼帯の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6488790B1 (en) * 2001-01-22 2002-12-03 International Steel Group Inc. Method of making a high-strength low-alloy hot rolled steel

Also Published As

Publication number Publication date
ES2316950T3 (es) 2009-04-16
HRP20090024T3 (en) 2009-02-28
PT1662011E (pt) 2009-02-03
DE602004018791D1 (de) 2009-02-12
DK1662011T3 (da) 2009-04-06
SI1662011T1 (sl) 2009-04-30
EP1662011A1 (en) 2006-05-31
PL1662011T3 (pl) 2009-06-30
ATE419399T1 (de) 2009-01-15

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