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WO2002048410A1 - Procede de production de feuillards ou de toles a chaud en acier microallie - Google Patents

Procede de production de feuillards ou de toles a chaud en acier microallie Download PDF

Info

Publication number
WO2002048410A1
WO2002048410A1 PCT/EP2001/014829 EP0114829W WO0248410A1 WO 2002048410 A1 WO2002048410 A1 WO 2002048410A1 EP 0114829 W EP0114829 W EP 0114829W WO 0248410 A1 WO0248410 A1 WO 0248410A1
Authority
WO
WIPO (PCT)
Prior art keywords
hot strip
temperature
hot
steel
weight
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.)
Ceased
Application number
PCT/EP2001/014829
Other languages
German (de)
English (en)
Inventor
Wilfried Hänsch
Werner Scholten
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
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 ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Priority to US10/398,795 priority Critical patent/US20040040633A1/en
Priority to AT01270630T priority patent/ATE293175T1/de
Priority to EP01270630A priority patent/EP1453984B8/fr
Priority to DE50105924T priority patent/DE50105924D1/de
Publication of WO2002048410A1 publication Critical patent/WO2002048410A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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 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
    • 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
    • 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

Definitions

  • the invention relates to a method for producing hot strip or sheet from ikrolegiertir. Steel.
  • the hot strips consist of a steel which in weight% is at most 0.3% C, at most 0.5% Si, 0.3 - 2.0% Mn, ⁇ 0.05% Al, 0.01 - 0.02 % Nb, 0.01 - 0.2% V and possibly 0.01 - 0.2% Mo and 0.01 - 0.2% Ti, balance iron and unavoidable impurities.
  • a raw material produced from this steel is finish-rolled into hot strip at a final roll temperature of at least 750 ° C., which is then immediately cooled to a coiling temperature of at most 650 ° C. The hot strip is then subjected to a final heat treatment.
  • the object of the invention is, starting from the prior art explained above, an inexpensive method for producing hot strips specify that have a high strength even with larger thicknesses.
  • This object is achieved according to the invention by a method for producing hot strips or sheets having a minimum yield strength of 700 N / mm 2 with a thickness of 8 mm, in which a micro-alloyed steel, which in addition to micro-alloying elements (in% by weight) 0.05 - 0.12% C, 0.2-0.5% Si, 1.5-2.2% Mn, ⁇ 0.025% P, ⁇ 0.01% S, balance contains iron and unavoidable impurities, to a starting material such as slabs , Thin slabs or blooms, is cast, in which the primary material is heated to a temperature of 1300 - 1350 ° C, in which the heated primary material is pre-rolled with a degree of deformation of 36% to 43%, in which the pre-rolled primary material is thermo-mechanical at one Above the Ac 3 temperature lying roll end temperature is hot rolled to a hot strip, in which the hot strip with a
  • Cooling rate of at least 15 ° C / s is cooled to a coiling temperature of at least 590 ° C and at most 630 ° C, with which the cooled hot strip is finally coiled.
  • the inventive design of the contents of the individual alloy elements and the targeted coordination of the final roll temperature, the cooling rate and the reel temperature can produce hot strips which have the highest strengths even with thicknesses of more than 8 mm.
  • a yield strength of at least 760 N / mm 2 can be achieved for thicknesses of 13 mm. Additional heat treatment after the cooling in the coil is not required.
  • the high strength of steel produced according to the invention is achieved by the combined use of precipitation, fine grain and mixed crystal strengthening.
  • the selected contents of the alloying elements C and Mn lead to the desired solid solution strengthening.
  • the primary material By bringing the primary material to a temperature of 1300 ° C to 1350 ° C before the preliminary rolling, the precipitates of the alloy elements Ti, V and Nb which may be present are completely dissolved.
  • the degrees of deformation set during the subsequent pre-deformation lead to a fine, evenly distributed and recrystallized austenite grain.
  • the excellent strength values make hot strip produced according to the invention particularly suitable for the production of load-bearing components on motor vehicles, such as, for example, heavily loaded side members of trucks.
  • the steel preferably contains at least one of the microalloying elements V, Mo, Ti, Nb in the following contents (in% by weight) 0.08-0.12% V, 0.1-0.2% Mo, 0.08-0, 11% Ti and 0.05-0.06% Nb.
  • the Al content should be between 0.02 - 0.05% by weight.
  • the micro alloying element niobium hinders austenite grain growth. It also hinders them Recrystallization of the austenite grains during hot rolling.
  • the recrystallization during hot rolling is also avoided by hot-rolling according to the invention at temperatures above the Ac 3 temperature.
  • the austenite / ferrite conversion takes place during the strip cooling behind the last stand of the hot rolling finishing train. In this way, a recrystallized, fine-grain structure with low pearlite contents is obtained.
  • the ferrite grains have a size of 11 to 14 ASTM.
  • the cooling rate of at least 15 ° C./s is selected in order to cool the hot strip sufficiently quickly from the hot rolling end temperature, which is preferably at least 840 ° C., to the coiling temperature.
  • the precipitation hardness maximum is reached by the micro-alloying elements Ti and V and Nb. This effect can be achieved particularly reliably if the reel temperature is in the range from 600 ° C. to 620 ° C.
  • Hot strips the yield strength of which is at least 700 N / mm 2 even with a thickness of 16 mm, can be produced particularly reliably in the procedure according to the invention if the steel (in% by weight) 0.06-0.08% C, 0, Contains 2-0.3% Si, 1.95-2.1% Mn, ⁇ 0.02% P and ⁇ 0.005% S.
  • the Ti content, if present, should not be more than 0.1% by weight.
  • hot strips the yield strength of which is at least 760 N / mm 2 at a thickness of 13 mm
  • the steel in% by weight
  • the steel preferably has at least one of the microalloying elements V, Mo, Ti, Nb in the following contents (in% by weight): 0.08-0.10% V, 0.1-0.2% Mo, 0.09 - 0.11% Ti, 0.05 - 0.06% Nb.
  • the steel used according to the invention can contain one or more of the elements N, Cu, Ni, Sn, B or As as a result of production or to express certain properties, the sum of the contents of these elements being not more than 0.1% by weight.
  • the holding time should be at least 135 minutes during the heating of the slabs to ensure that the raw material is safely warmed up.
  • the slabs were then preheated at a temperature of 1350 ° C. for 135 minutes and then rolled to a thickness of 55 mm at a degree of deformation between 36% and 43%.
  • the pre-rolled slabs were thermo-mechanically finished rolled in a finishing mill to a thickness of 16 mm.
  • the temperature control and the degree of deformation were coordinated with one another in such a way that the hot-rolled hot strip A had an optimal microstructure for the intended use.
  • the final roll temperature was 840 ° C.
  • the hot strip A emerging from the finishing rolling mill was immediately water-cooled to a reel temperature of 610 ° C. and coiled. In the course of water cooling, cooling speeds of at least 15 ° C / s were achieved. Tensile tests were carried out on samples AI-A8 obtained from the hot strip A thus produced, the results of which are given in Table 1:
  • composite steel melt was cast into slabs.
  • the slabs were preheated at a temperature of 1350 ° C. for 135 minutes, then rolled to a thickness of 55 mm and hot-rolled in a finishing mill at a final roll temperature of 840 ° C.
  • the thickness of the hot rolled strip was 13 mm.
  • the hot strip B emerging from the finishing rolling mill was, like the hot strip A, immediately water-cooled and coiled to a coiling temperature of 610 ° C. In the course of water cooling, cooling rates of 15 ° C / s were again achieved.

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)
  • Laminated Bodies (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne un procédé de production de feuillards ou de tôles à chaud, consistant à couler un acier microallié contenant, outre les éléments de microalliage (en % en poids) C : 0,05 - 0,12 %, Si : 0,2 - 0,5 %, Mn : 1,5 - 2,2 %, Al : 0,02 - 0,05 %, P : </= 0,025 %, S : </= 0,01 %, du fer et les impuretés inévitables, pour obtenir un produit primaire tel que des brames, des blooms ou des brames minces. Le produit primaire est ensuite chauffé à une température de 1300 - 1350 DEG C, le produit primaire chauffé est ébauché avec un degré de déformation compris entre 36 % et 43 %, le produit primaire ébauché est laminé à chaud thermomécaniquement à une température finale de laminage supérieure à la température Ac3 pour former un feuillard à chaud, lequel est refroidi à une vitesse de refroidissement d'au moins 15 DEG C/s à une température de bobinage comprise entre 590 DEG C et 630 DEG C, température à laquelle le feuillard refroidi est alors bobiné. Ce procédé permet de produire de façon économique des feuillards à chaud qui présentent une résistance particulièrement élevée, y compris en cas d'épaisseurs importantes.
PCT/EP2001/014829 2000-12-16 2001-12-15 Procede de production de feuillards ou de toles a chaud en acier microallie Ceased WO2002048410A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/398,795 US20040040633A1 (en) 2000-12-16 2001-12-15 Method for the production of hot strip or sheet from a micro-alloyed steel
AT01270630T ATE293175T1 (de) 2000-12-16 2001-12-15 Verfahren zum herstellen von warmband oder -blech aus einem mikrolegierten stahl
EP01270630A EP1453984B8 (fr) 2000-12-16 2001-12-15 Procede de production de feuillards ou de toles a chaud en acier microallie
DE50105924T DE50105924D1 (de) 2000-12-16 2001-12-15 Verfahren zum herstellen von warmband oder -blech aus einem mikrolegierten stahl

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10062919.9 2000-12-16
DE10062919A DE10062919A1 (de) 2000-12-16 2000-12-16 Verfahren zum Herstellen von Warmband oder -blech aus einem mikrolegierten Stahl

Publications (1)

Publication Number Publication Date
WO2002048410A1 true WO2002048410A1 (fr) 2002-06-20

Family

ID=7667534

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/014829 Ceased WO2002048410A1 (fr) 2000-12-16 2001-12-15 Procede de production de feuillards ou de toles a chaud en acier microallie

Country Status (6)

Country Link
US (1) US20040040633A1 (fr)
EP (1) EP1453984B8 (fr)
AT (1) ATE293175T1 (fr)
DE (2) DE10062919A1 (fr)
ES (1) ES2240337T3 (fr)
WO (1) WO2002048410A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1396550A1 (fr) * 2002-08-28 2004-03-10 ThyssenKrupp Stahl AG Procédé pour la fabrication d' une bande à chaud
EP1918402A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé de fabrication de produits plats en acier à partir d'un acier formant une structure de phases complexes
EP1918406A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases micro-allié en bore
US11225697B2 (en) 2014-12-19 2022-01-18 Nucor Corporation Hot rolled light-gauge martensitic steel sheet and method for making the same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20095528L (fi) * 2009-05-11 2010-11-12 Rautaruukki Oyj Menetelmä kuumavalssatun nauhaterästuotteen valmistamiseksi sekä kuumavalssattu nauhaterästuote
FI122143B (fi) * 2009-10-23 2011-09-15 Rautaruukki Oyj Menetelmä korkealujuuksisen sinkityn muotovalmisteen valmistamiseksi sekä muotovalmiste
JP5365673B2 (ja) * 2011-09-29 2013-12-11 Ｊｆｅスチール株式会社 材質均一性に優れた熱延鋼板およびその製造方法
JP5578288B2 (ja) 2012-01-31 2014-08-27 Ｊｆｅスチール株式会社 発電機リム用熱延鋼板およびその製造方法
CN111519105B (zh) * 2020-05-12 2021-06-15 首钢集团有限公司 一种汽车构件钢及其制备方法、汽车构件

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925111A (en) * 1972-12-31 1975-12-09 Nippon Steel Corp High tensile strength and steel and method for manufacturing same
JPS58136719A (ja) * 1982-02-05 1983-08-13 Nippon Kokan Kk <Nkk> 高強度熱延鋼板の製造方法
JPS61281814A (ja) * 1985-06-06 1986-12-12 Kobe Steel Ltd バウシンガ−効果感受性の低い高強度熱延鋼板の製造方法
JPS63223130A (ja) * 1987-03-13 1988-09-16 Kawasaki Steel Corp 加工性に優れた高張力熱延鋼板の製造方法
JPH059572A (ja) * 1991-07-08 1993-01-19 Sumitomo Metal Ind Ltd 加工性に優れた熱延鋼板の製造法
EP0564309A1 (fr) * 1992-02-28 1993-10-06 Sollac Procédé d'élaboration d'une tôle d'acier et tôle d'acier obtenue par ce procédé
JPH11140542A (ja) * 1997-11-11 1999-05-25 Nkk Corp 高延性を有し、かつ材質均一性に優れた高強度熱延鋼板の製造方法

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* Cited by examiner, † Cited by third party
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DE2133744B2 (de) * 1971-07-07 1973-07-12 August Thyssen-Hütte AG, 4100 Duisburg Die verwendung eines vollberuhigten stahles fuer gegenstaende aus warmgewalztem band

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925111A (en) * 1972-12-31 1975-12-09 Nippon Steel Corp High tensile strength and steel and method for manufacturing same
JPS58136719A (ja) * 1982-02-05 1983-08-13 Nippon Kokan Kk <Nkk> 高強度熱延鋼板の製造方法
JPS61281814A (ja) * 1985-06-06 1986-12-12 Kobe Steel Ltd バウシンガ−効果感受性の低い高強度熱延鋼板の製造方法
JPS63223130A (ja) * 1987-03-13 1988-09-16 Kawasaki Steel Corp 加工性に優れた高張力熱延鋼板の製造方法
JPH059572A (ja) * 1991-07-08 1993-01-19 Sumitomo Metal Ind Ltd 加工性に優れた熱延鋼板の製造法
EP0564309A1 (fr) * 1992-02-28 1993-10-06 Sollac Procédé d'élaboration d'une tôle d'acier et tôle d'acier obtenue par ce procédé
JPH11140542A (ja) * 1997-11-11 1999-05-25 Nkk Corp 高延性を有し、かつ材質均一性に優れた高強度熱延鋼板の製造方法

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PATENT ABSTRACTS OF JAPAN vol. 011, no. 141 (C - 421) 8 May 1987 (1987-05-08) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 021 (C - 560) 18 January 1989 (1989-01-18) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 274 (C - 1064) 27 May 1993 (1993-05-27) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 10 31 August 1999 (1999-08-31) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1396550A1 (fr) * 2002-08-28 2004-03-10 ThyssenKrupp Stahl AG Procédé pour la fabrication d' une bande à chaud
EP1918402A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé de fabrication de produits plats en acier à partir d'un acier formant une structure de phases complexes
EP1918406A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases micro-allié en bore
WO2008052917A1 (fr) * 2006-10-30 2008-05-08 Thyssenkrupp Steel Ag Procédé de fabrication de produits plats en acier à partir d'un acier formant une structure à phase complexe
WO2008052919A1 (fr) * 2006-10-30 2008-05-08 Thyssenkrupp Steel Ag Procédé de fabrication de produits plats en acier à partir d'un acier multiphase micro-allié à du bore
US11225697B2 (en) 2014-12-19 2022-01-18 Nucor Corporation Hot rolled light-gauge martensitic steel sheet and method for making the same

Also Published As

Publication number Publication date
ES2240337T3 (es) 2005-10-16
EP1453984B1 (fr) 2005-04-13
EP1453984A1 (fr) 2004-09-08
DE10062919A1 (de) 2002-06-27
US20040040633A1 (en) 2004-03-04
ATE293175T1 (de) 2005-04-15
EP1453984B8 (fr) 2005-07-27
DE50105924D1 (de) 2005-05-19

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