EP0748877B1 - Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech - Google Patents

Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech Download PDF

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Publication number
EP0748877B1
EP0748877B1 EP96401263A EP96401263A EP0748877B1 EP 0748877 B1 EP0748877 B1 EP 0748877B1 EP 96401263 A EP96401263 A EP 96401263A EP 96401263 A EP96401263 A EP 96401263A EP 0748877 B1 EP0748877 B1 EP 0748877B1
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EP
European Patent Office
Prior art keywords
sheet
steel sheet
niobium
temperature
thickness
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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.)
Expired - Lifetime
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EP96401263A
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English (en)
French (fr)
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EP0748877A1 (de
Inventor
Xavier Bano
Maurice Malta
Stéphane Fiori
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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    • 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 a sheet metal strip. hot rolled steel with very high yield strength, particularly for the shaping of parts and having a brittle / ductile transition to a temperature below -50 ° C.
  • Controlled rolling keeps sheet steel in a low equivalent carbon level and obtain mechanical properties wanted by refining of the ferritic structure grain and coherent precipitation niobium carbonitride, niobium can be combined with titanium or vanadium.
  • a product such as a ULCB steel sheet (bainitic structure low carbon) has a higher yield strength at 700 MPa and a brittle / ductile transition temperature of approximately - 60 ° C.
  • flawless 180 ° bending of the steel sheet is limited to internal bending diameters greater than 2.5 times the thickness of the sheet in the rolling direction and greater than 3 times the thickness of the sheet in the cross direction of rolling.
  • a product such as a micro-alloy steel sheet has a yield strength greater than 700 MPa and can be bent 180 ° without generating a defect for a bending diameter less than twice the thickness of the sheet but this steel has the disadvantage of having a temperature of ductile / brittle transition between -20 ° C and -40 ° C.
  • the object of the invention is to present a method for producing a strip of hot-rolled steel sheet with very high yield strength especially for the shaping of parts and presenting a possibility faultless 180 ° bending under a bending diameter of less than twice sheet thickness and brittle / ductile transition at a lower temperature at -50 ° C.
  • the invention also relates to a steel sheet as defined in claim 4.
  • Figure 1 is a curve showing schematic, according to the method of the invention, the variation of temperature as a function of time, imposed on the strip of hot-rolled sheet steel.
  • Figure 2 shows transition curves brittle / ductile for a 5 mm thick steel sheet, brittle / ductile transition measured in the direction long and crosswise of the rolled sheet strip hot.
  • the basic composition provides a ferrite microstructure and hardened granular bainite by precipitation of niobium-titanium microalloy elements.
  • the rolling process according to the invention aims to obtain a good recrystallization of the austenitic grains at the exit of the rolling mill stands thus allowing obtaining an equiaxed structure.
  • Steel structure of sheet metal strip allows high elongations greater than 15 % up to 20% and bending at 180 ° without defect with smaller inside bending diameters twice the thickness of the sheet.
  • the temperature at the end of rolling is greater than 850 ° C, and preferably 900 ° C in order to limit the precipitation of micro-alloying elements induced by hot rolling and secondly, to make the most of their effect hardening during controlled cooling.
  • Controlled cooling is imposed on the belt hot-rolled sheet after a time interval less than 10 seconds between the end of hot rolling and the start of controlled cooling.
  • the time interval is of the order of 1.5 seconds, this which ensures a very fine grain size and a limit high elasticity.
  • the controlled cooling rates are chosen between 20 ° C per second and 100 ° C per second in depending on the thickness of the sheet strip to be treated.
  • the controlled cooling rate is, on average 40 ° C per second for a strip of sheet metal about 5 mm thick. Under these conditions, there are hardening precipitation of microalloy elements, which provides an upper yield strength at 700 MPa, or 740 MPa.
  • End of controlled cooling temperature is between 550 ° C and 750 ° C and preferably 650 ° C, which ensures hardening precipitation of microalloy elements.
  • Figure 1 is a diagrammatic curve, according to the process of the invention, the temperature variation in time function imposed on the sheet steel strip after hot rolling. After rolling to a temperature greater than 850 ° C represented by the portion of curve "a”, a period of less than 10 seconds, represented by the portion of curve "b", is requested before controlled cooling of the rolled sheet strip hot which is represented by the portion of curve "c".
  • Figure 2 shows two transition curves A and B brittle / ductile, i.e. curves giving the breaking energy of a test piece taken from a sheet metal as a function of temperature.
  • Curves A and B relate to a steel sheet 5 mm thick and the brittle / ductile transition is measured respectively in the long direction and in the cross direction of the sheet hot rolled.
  • the sheet steel strip according to the invention does not have a brittle / ductile transition in the temperature range between + 20 ° C and -80 ° C. All the ruptures are therefore ductile up to -80 ° C.
  • the brittle / ductile transition temperature is therefore less than -80 ° C.
  • the method according to the invention allows the realization thick hot-rolled steel sheet between 2.5 and 10 mm, sheet of which the steel has an elastic limit greater than 700 MPa.
  • Prison steel can be subjected to a 180 ° bend without defects, the inside diameter of the folding can be less than twice the thickness of the sheet.
  • Titanium participates in precipitation hardening in the form of TiC.
  • Molybdenum allows after precipitation microalloy elements in the form of carbide, limit carbon diffusion at high temperatures thus ensuring obtaining fine precipitates in the ferritic matrix and lowering the temperature of fragile / ductile transition at a temperature always located below -50 ° C in the case of a steel according to the composition defining the invention.
  • the hot-rolled sheet strip according to the invention can be used for parts manufacturing folded profiled or stamped with reduced thickness for their lightening and / or pieces having better mechanical characteristics in fatigue.
  • the low temperature of brittle / ductile transition offers the possibility operation of pieces of equipment, entering through example in the construction of cranes, in a field of very low temperature without risk of fragile breakage.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (4)

  1. Verfahren zur Herstellung eines warmgewalzten Stahlblechstreifens, der eine Dicke im Bereich zwischen 2,5 mm und 10 mm besitzt, dessen Elastizitätsgrenze mehr als 700 MPa beträgt, der bei einem Biegungsinnendurchmesser von weniger als der zweifachen Dicke des Blechs ohne Schädigung um 180° gebogen werden kann, der vor allem zum Formen von Teilen verwendbar ist und der eine Temperatur des Übergangs zwischen spröde und formbar aufweist, die unter -50 °C liegt, dadurch gekennzeichnet, daß der Stahl mit folgender gewichtsbezogener Zusammensetzung:
    Kohlenstoff ≤ 0,1 %,
    1 % ≤ Mangan ≤ 1,5%,
    Silicium ≤ 0,3 %,
    Phosphor ≤ 0,03 %,
    Schwefel ≤ 0,01 %,
    0,01 % ≤ Aluminium ≤ 0,1 %,
    0,04 % ≤ Niobium ≤ 0,06 %,
    0,1 % ≤ Titan ≤ 0,15 %,
    0,1 % ≤ Molybdän ≤ 0,2 %,
    wobei der Rest mit Ausnahme von Verunreinigungen, die mit der Herstellung zusammenhängen, aus Eisen besteht,
    nach dem Warmwalzen einer gesteuerten Abkühlung auf eine Abkühlungsendtemperatur im Bereich zwischen 550 °C und 750°C bei einer Abkühlgeschwindigkeit im Bereich zwischen 20 °C pro Sekunde und 100 °C pro Sekunde unterzogen wird, derart, daß eine körnige, durch Ausscheidung der Niobium-Titan-Mikrolegierungselemente ausgehärtete Ferrit- und Bainit-Mikrostruktur erhalten wird.
  2. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Temperatur am Ende des Warmwalzens vorzugsweise mehr als 850 °C beträgt.
  3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Zeit, die zwischen dem Ende der Warmwalzung und dem Beginn der gesteuerten Abkühlung vergeht, vorzugsweise weniger als 10 Sekunden beträgt.
  4. Warmgewalztes Stahlblech mit einer Dicke im Bereich zwischen 2,5 mm und 10 mm, das eine Elastizitätsgrenze von mehr als 700 MPa besitzt und bei einem Biegungsinnendurchmesser von weniger als der zweifachen Dicke des Blechs ohne Schädigung um 180° gebogen werden kann, das vor allem zum Formen von Teilen verwendbar ist und eine Temperatur des Übergangs zwischen spröde und formbar aufweist, die unter -50 °C liegt, wobei das Blech durch das Verfahren nach Anspruch 1 bis 3 erhalten wird, gekennzeichnet durch die folgende gewichtsbezogene Zusammensetzung:
    Kohlenstoff ≤ 0,1 %,
    1 % ≤ Mangan ≤ 1,5 %,
    Silicium ≤ 0,3 %,
    Phosphor ≤ 0,03 %,
    Schwefel ≤ 0,01 %,
    0,01 % ≤ Aluminium ≤ 0,1 %,
    0,04 % ≤ Niobium ≤ 0,06 %,
    0,1 % ≤ Titan ≤ 0,15 %,
    0,1 % ≤ Molybdän ≤ 0,2 %,
    wobei der Rest mit Ausnahme von Verunreinigungen, die mit der Herstellung zusammenhängen, aus Eisen besteht, und umfassend eine körnige, durch Ausscheidung der Niobium-Titan-Mikrolegierungselemente ausgehärtete Ferrit- und Bainit-Mikrostruktur.
EP96401263A 1995-06-15 1996-06-11 Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech Expired - Lifetime EP0748877B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9507122A FR2735498B1 (fr) 1995-06-15 1995-06-15 Procede de realisation d'une bande de tole d'acier laminee a chaud a haute limite d'elasticite utlisable notamment pour la mise en forme
FR9507122 1995-06-15

Publications (2)

Publication Number Publication Date
EP0748877A1 EP0748877A1 (de) 1996-12-18
EP0748877B1 true EP0748877B1 (de) 2001-03-07

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Application Number Title Priority Date Filing Date
EP96401263A Expired - Lifetime EP0748877B1 (de) 1995-06-15 1996-06-11 Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech

Country Status (6)

Country Link
US (1) US5716464A (de)
EP (1) EP0748877B1 (de)
AT (1) ATE199575T1 (de)
DE (1) DE69611950T2 (de)
ES (1) ES2156985T3 (de)
FR (1) FR2735498B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3417878B2 (ja) * 1999-07-02 2003-06-16 株式会社神戸製鋼所 伸びフランジ性および疲労特性に優れた高強度熱延鋼板およびその製法
KR100401272B1 (ko) * 1999-09-29 2003-10-17 닛폰 고칸 가부시키가이샤 박강판 및 박강판의 제조방법
FR2801061B1 (fr) * 1999-11-12 2001-12-14 Lorraine Laminage Procede de realisation d'une bande de tole laminere a chaud a tres haute resistance, utilisable pour la mise en forme et notamment pour l'emboutissage
JP6252291B2 (ja) * 2014-03-26 2017-12-27 新日鐵住金株式会社 鋼板及びその製造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795506A (en) * 1971-04-20 1974-03-05 Nippon Kokan Kk Nonthermal refining type high tension steel exhibiting excellent cold-work-ability
US3976514A (en) * 1975-02-10 1976-08-24 Nippon Steel Corporation Method for producing a high toughness and high tensil steel
DE2517164A1 (de) * 1975-04-18 1976-10-21 Rheinstahl Giesserei Ag Verwendung einer schweissbaren, hoeherfesten stahllegierung fuer dickwandige stahlgusserzeugnisse
JPS6220821A (ja) * 1985-07-17 1987-01-29 Nippon Steel Corp 高強度厚鋼板の製造法
JP3031485B2 (ja) * 1990-11-28 2000-04-10 川崎製鉄株式会社 降伏伸びに優れた高強度鉄筋の製造方法
EP0535238A4 (en) * 1991-03-13 1993-08-04 Kawasaki Steel Corporation High-strength steel sheet for forming and production thereof
WO1995026424A1 (fr) * 1994-03-29 1995-10-05 Nippon Steel Corporation Tole grosse d'acier presentant d'excellentes caracteristiques sur le plan de la prevention de la propagation des criques et de la durete a basse temperature et procede d'elaboration de cette tole

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H. Berns, Stahlkunde für Ingenieure, 2. ed. juillet 1993, Springer Verlag, Berlin, p. 109-111 *

Also Published As

Publication number Publication date
US5716464A (en) 1998-02-10
DE69611950T2 (de) 2001-06-21
DE69611950D1 (de) 2001-04-12
ES2156985T3 (es) 2001-08-01
FR2735498A1 (fr) 1996-12-20
EP0748877A1 (de) 1996-12-18
ATE199575T1 (de) 2001-03-15
FR2735498B1 (fr) 1997-07-11

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