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EP0971044B1 - Beschichtetes warmgewalztes und kaltgewalztes Stahlblech mit sehr hoher Festigkeit nach thermischer Behandlung - Google Patents

Beschichtetes warmgewalztes und kaltgewalztes Stahlblech mit sehr hoher Festigkeit nach thermischer Behandlung Download PDF

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Publication number
EP0971044B1
EP0971044B1 EP99401690A EP99401690A EP0971044B1 EP 0971044 B1 EP0971044 B1 EP 0971044B1 EP 99401690 A EP99401690 A EP 99401690A EP 99401690 A EP99401690 A EP 99401690A EP 0971044 B1 EP0971044 B1 EP 0971044B1
Authority
EP
European Patent Office
Prior art keywords
sheet
coating
aluminium
composition
coated
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.)
Expired - Lifetime
Application number
EP99401690A
Other languages
English (en)
French (fr)
Other versions
EP0971044A1 (de
Inventor
Jean-Pierre Laurent
Jacques Devroc
Jean-Paul Hennechart
Dominique Spehner
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.)
ArcelorMittal France SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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
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Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0971044A1 publication Critical patent/EP0971044A1/de
Application granted granted Critical
Publication of EP0971044B1 publication Critical patent/EP0971044B1/de
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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/939—Molten or fused coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/1275—Next to Group VIII or IB metal-base component
    • Y10T428/12757—Fe

Definitions

  • the invention relates to a hot-rolled and cold-rolled steel sheet coated with and having a very high resistance after heat treatment.
  • the proposed solutions mechanical characteristics are exerted to the detriment of the formatting properties.
  • the characteristics necessary for the use are obtained by a treatment thermal posterior or concomitant to the shaping.
  • the sheets offered are not delivered coated for problems with coating during heat treatment. The coating is therefore carried out on finished parts which requires careful cleaning of surfaces and parts hollow.
  • the heat treatment must be carried out under atmosphere controlled to avoid decarburization and oxidation of the sheet metal.
  • the steel sheets for heat treatment do not have pre-coating, which requires post-treatments of degreasing, stripping and coating.
  • JP 01-176,056 discloses a high-strength steel composition having good resistance to fatigue and containing 0.30-0.55% C, 0.15-0.35% Si, 1.00-2.00% Mn, less than 0.040% S, 0.0010-0.0040% B, 0102-0.05% Ti, less than 0.008% N, less than 0.003% O and 0.02-0.04% Al and optionally less than 0.40% Cr, the Ti / N ratio being greater than or equal to 3.
  • the object of the invention is to produce a hot rolled steel sheet or cold of a desired thickness, coated, and presenting possibilities of setting in extended form and which, after heat treatment performed on the finished part, allows to obtain a mechanical strength greater than 1000 MPa, a resistance to shocks, fatigue, abrasion and heavy wear, all maintaining good corrosion resistance and good suitability painting and collage. It must also be possible to implement the hot form with quenching in the tool by obtaining the same properties.
  • the invention also relates to a method for producing a part to from the coated sheet in which after shaping and before treatment thermal, the coating of the part is subjected to an elevation of temperature exceeding 5 ° C / second which may exceed 600 ° C / second.
  • the invention also relates to the use of hot-rolled steel sheet and can then be cold-rolled and coated, for structural parts and / or anti-intrusion or underbody for a land motor vehicle such as a bumper beam, a door reinforcement, an arm wheel ...
  • the sheet according to the invention which arises, because of its elaboration, of a hot rolling mill, can optionally be cold-rolled in depending on the desired final thickness. It is then coated based on aluminum, for example by dipping in a bath further comprising from 8% to 11% of silicon, from 2% to 4% of iron, the sheet having a high mechanical strength after heat treatment and high resistance to corrosion, as well as a good aptitude for painting and gluing.
  • the function of the coating is notably to protect the sheet metal base against corrosion hot and cold.
  • Characteristics in the state of delivery of the sheet according to the invention allow a wide variety of shaping especially a deep stamping.
  • the heat treatment applied in a hot forming process or after the shaping makes it possible to obtain high mechanical characteristics may exceed 1500 MPa for strength and 1200 MPa for the yield strength.
  • the final mechanical characteristics are adaptable and depend on the carbon content of the steel and the heat treatment.
  • the coating forms a layer having a high resistance to abrasion, wear, fatigue, shock as well as good resistance to corrosion and a good aptitude for painting and gluing.
  • a coating of the sheet by dipping in a metal bath containing an aluminum alloy comprising a proportion of approximately 90% aluminum, the coating layer has a first layer of alloy in contact with the surface of the steel. This layer, directly in contact with the surface of the sheet is strongly allied in iron.
  • a second layer of coating, above the first, contains approximately 90% aluminum and may contain, depending on the composition of the bath, silicon and a little iron.
  • the first alloy layer may crack when the sheet is form for the manufacture of parts.
  • the coating is subjected to a temperature rise at a speed greater than 5 ° C / second which may exceed 600 ° C / second. This climb in temperature allows rapid reflow of the aluminum which clogs the cracks caused by the operation of shaping the workpiece.
  • Another advantage of the invention lies in the fact that the diffusion iron in the coating will be initiated at high temperature. We will have a better cohesion between coating and the steel of the sheet.
  • the heat treatment can be carried out locally, in strongly deformed areas.
  • the steel sheet according to the invention containing 0.21% carbon; 1.14% manganese; 0.020% phosphorus; 0.0038% sulfur; 0.25% silicon; 0.040% aluminum; 0.009% copper; 0.020% nickel; 0.18% chromium; 0.0040% nitrogen; 0.032% titanium; 0.003% boron; 0.0050% calcium is coated with a base layer aluminum having about 20 microns thick.
  • the sheet in the state of delivery in a reel or in sheets, whose thickness can be between 0.25 mm and 15 mm has good shaping properties as well as good corrosion resistance as well as a good aptitude for painting and gluing.
  • Sheet metal, a coated steel product has significant resistance Corrosion in the delivery state, during shaping and processing as well as during the use of the finished part. After treatment thermally, a significant mechanical strength is obtained that can exceed 1500 MPa.
  • the presence of the coating during the heat treatment of the parts prevents any decarburization of the base metal as well as any oxidation. This is an undeniable advantage, especially in the case of formatting hot.
  • the heating of the treated part does not require an oven having a controlled atmosphere to avoid decarburization.
  • the heat treatment of the metal of the sheet consists of heating at a temperature between Ac1, transformation start temperature austenitic, for example, 750 ° C, and 1200 ° C, in an oven, for a time which is a function of the temperature to be reached and the thickness of the sheet of the room.
  • the composition is optimized to limit the magnification of the grains during heat treatment. If the targeted structure is totally martensitic, the holding temperature must be greater than Ac3, for example 840 ° C, end of austenitic formation temperature. The temperature maintenance must followed by a cooling adapted to the final structure aimed.
  • the cooling rate must be greater than the critical speed of quenching which is 27 ° C / s for austenitization at 900 ° C for 5 min, the sheet having a thickness of about 1 mm.
  • Chromium, manganese, boron and carbon are added, in the composition of the steel according to the invention, for their influence on hardenability.
  • carbon achieves high mechanical characteristics thanks to its effect on the hardness of martensite.
  • Aluminum is introduced into the composition in order to trap oxygen and to protect the effectiveness of boron.
  • Titanium whose ratio of the content to the nitrogen content must be greater than 3.42 is introduced in order to avoid the combination of boron with nitrogen, nitrogen being combined with titanium.
  • the alloy elements, Mn, Cr, B allow a hardenability permitting quenching in stamping tools or the use of low hardness limiting the deformation of parts during treatment thermal.
  • the composition according to the invention is optimized from the point of view of view of weldability.
  • the steel of the sheet can undergo a treatment of globulization of sulphides made with calcium which improves fatigue resistance sheet metal.
  • the proposed coating avoids various operations of surface preparation as for steel sheets for processing thermal having no coating.
  • the modulation of the heat treatment parameters allows to achieve, with a given composition, different levels of resistance in hot and cold sheet metal depending on the thickness.
  • the coating based for example of aluminum is transformed into a layer allied with iron and having different phases depending on the heat treatment and having a high hardness that can exceed 600HV100g.

Landscapes

  • 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)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Laminated Bodies (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (8)

  1. Warmgewalztes Stahlblech, welches unter Umständen anschließend kaltgewalzt werden könnte, das Blech beschichtet und thermisch behandelt wurde, der Stahl des Bleches die folgende gewichtsanalytische Zusammensetzung hat:
    0,15% < Kohlenstoff < 0,5%
    0,5% < Mangan < 3%
    0,1% < Silizium < 0,5%
    0,01% < Chrom < 1%
    Titan < 0,2%
    Aluminium < 0,1%
    Phosphor < 0,1%
    Schwefel < 0,05%
    0,0005 < Bor < 0,08%, wobei der Rest aus Eisen und aus, von der Stahlerzeugung herrührenden Verunreinigungen besteht, und die Beschichtung auf Aluminium oder auf Aluminiumlegierung basiert.
  2. Beschichtetes Blech gemäß Anspruch 1, dadurch gekennzeichnet, daß die gewichtsanalytische Zusammensetzung des Bleches vorzugsweise wie folgt ist:
    0,20% < Kohlenstoff < 0,5%
    0,8% < Mangan < 1,5%
    0,1% < Silizium < 0,35%
    0,01% < Chrom < 1%
    Titan < 0,1%
    Aluminium < 0,1%
    Phosphor < 0,05%
    Schwefel < 0,03%
    0,0005 < Bor < 0,01%, wobei der Rest aus Eisen und aus, von der Stahlerzeugung herrührenden Verunreinigungen besteht.
  3. Beschichtetes Blech gemäß Anspruch 1, dadurch gekennzeichnet, daß in der gewichtsanalytischen Zusammensetzung des Bleches, der Titangehalt im Verhältnis zum Stickstoffgehalt größer als 3,42 ist, wobei das Bor nicht mehr mit dem Stickstoff verbunden werden kann.
  4. Beschichtetes Blech gemäß Anspruch 1, dadurch gekennzeichnet, daß das Metallbad für die Beschichtung, in seiner gewichtsanalytischen Grundzusammensetzung, von 9% bis zu 10% Silikon, von 2% bis 3,5% Eisen enthält, und der Rest aus Aluminium besteht.
  5. Blech gemäß Anspruch 1, dadurch gekennzeichnet, daß das Metallbad für die Beschichtung, in seiner gewichtsanalytischen Grundzusammensetzung, von 2% bis zu 4% Eisen enthält, und der Rest aus Aluminium besteht.
  6. Verfahren zur Herstellung eines Teils, ausgehend vom beschichteten Blech gemäß Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß nach der Formgebung und vorgängig zur Wärmebehandlung die Beschichtung des Teils einer Temperaturerhöhung mit einer Schnelligkeit größer als 5°C/Sekunde, die aber auch 600°C/Sekunde überschreiten könnte, unterzogen wird.
  7. Verfahren gemäß dem Anspruch 6, dadurch gekennzeichnet, daß die Wärmebehandlung darin besteht, die Beschichtung und das Teil auf eine Temperatur von mehr als 750°C zu erwärmen.
  8. Verwendung des warmgewalzten Stahlbleches welches, kaltgewalzt und beschichtet werden kann, gemäß den Ansprüchen 1 bis 5, für Strukturteile und/oder "Anti-lntrusions"-Teile oder für den Unterbau motorgetriebener Landfahrzeuge.
EP99401690A 1998-07-09 1999-07-07 Beschichtetes warmgewalztes und kaltgewalztes Stahlblech mit sehr hoher Festigkeit nach thermischer Behandlung Expired - Lifetime EP0971044B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9808793A FR2780984B1 (fr) 1998-07-09 1998-07-09 Tole d'acier laminee a chaud et a froid revetue et comportant une tres haute resistance apres traitement thermique
FR9808793 1998-07-19

Publications (2)

Publication Number Publication Date
EP0971044A1 EP0971044A1 (de) 2000-01-12
EP0971044B1 true EP0971044B1 (de) 2003-05-14

Family

ID=9528455

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EP99401690A Expired - Lifetime EP0971044B1 (de) 1998-07-09 1999-07-07 Beschichtetes warmgewalztes und kaltgewalztes Stahlblech mit sehr hoher Festigkeit nach thermischer Behandlung

Country Status (11)

Country Link
US (3) US6296805B1 (de)
EP (1) EP0971044B1 (de)
JP (1) JP3931251B2 (de)
AT (1) ATE240419T1 (de)
BR (1) BR9902712A (de)
CA (1) CA2276911C (de)
DE (1) DE69907816T2 (de)
DK (1) DK0971044T3 (de)
ES (1) ES2196740T3 (de)
FR (1) FR2780984B1 (de)
PT (1) PT971044E (de)

Cited By (13)

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EP1865086A1 (de) 2006-06-07 2007-12-12 ThyssenKrupp Steel AG Mangan-Bor-Stahl, aus einem solchen Stahl hergestelltes Flachprodukt und Verfahren zu dessen Herstellung
DE102009007909A1 (de) 2009-02-06 2010-08-12 Thyssenkrupp Steel Europe Ag Verfahren zum Herstellen eines Stahlbauteils durch Warmformen und durch Warmformen hergestelltes Stahlbauteil
WO2010112140A1 (de) 2009-04-02 2010-10-07 Volkswagen Aktiengesellschaft Verfahren zur herstellung eines bauteils, insbesondere eines karosserieteiles, sowie fertigungsstrasse zur durchführung des verfahrens
KR101590689B1 (ko) 2011-05-12 2016-02-01 아르셀러미탈 인베스티가시온 와이 데살롤로 에스엘 초고강도 마텐자이트 강의 제조 방법 및 이 방법에 의해 획득된 시트 또는 부품
EP2993248A1 (de) 2014-09-05 2016-03-09 ThyssenKrupp Steel Europe AG Stahlflachprodukt mit einer Al-Beschichtung, Verfahren zu seiner Herstellung, Stahlbauteil und Verfahren zu dessen Herstellung
DE102015225662A1 (de) 2015-12-17 2017-06-22 Volkswagen Aktiengesellschaft Verfahren zur vorbereitenden Behandlung und zur Warmumformung eines Stahlbauteils
DE102016000177A1 (de) 2016-01-13 2017-07-13 Klaus-Dieter Horn Stahlband aus borlegiertem Vergütungsstahl mit hohem Stickstoffgehalt
US10323292B2 (en) 2014-05-12 2019-06-18 Thyssenkrupp Steel Europe Ag Method for producing a steel component which is shaped by hot-forming a steel sheet which has a metal coating, such a steel sheet, and a steel component produced from said steel sheet by means of a hot-forming process
WO2021074388A1 (de) 2019-10-18 2021-04-22 Thyssenkrupp Steel Europe Ag Verfahren zum herstellen eines stahlflachprodukts und verfahren zum herstellen eines bauteils daraus
WO2022038135A1 (de) 2020-08-19 2022-02-24 Thyssenkrupp Steel Europe Ag Verfahren zum herstellen eines stahlflachproduktes mit einem aluminium-basierten korrosionsschutzüberzug und stahlflachprodukt mit einem aluminium-basierten korrosionsschutzüberzug
EP4092141A1 (de) 2021-05-21 2022-11-23 ThyssenKrupp Steel Europe AG Stahlflachprodukt mit einer al-beschichtung, verfahren zu dessen herstellung, stahlbauteil und verfahren zu dessen herstellung
WO2023202765A1 (de) 2022-04-20 2023-10-26 Thyssenkrupp Steel Europe Ag Stahlflachprodukt mit einer al-beschichtung, verfahren zu dessen herstellung, stahlbauteil und verfahren zu dessen herstellung
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US9067260B2 (en) 2006-09-06 2015-06-30 Arcelormittal France Steel plate for producing light structures and method for producing said plate
US11155902B2 (en) 2006-09-27 2021-10-26 Nucor Corporation High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same
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DE102006053819A1 (de) * 2006-11-14 2008-05-15 Thyssenkrupp Steel Ag Verfahren zum Herstellen eines Bauteil durch Warmpresshärten und hochfestes Bauteil mit verbesserter Bruchdehnung
EP2126144B1 (de) 2007-02-23 2017-12-27 Tata Steel IJmuiden BV Verfahren zur thermomechanischen formung eines endprodukts mit sehr hoher stärke und damit hergestelltes produkt
WO2008104610A1 (en) * 2007-07-19 2008-09-04 Corus Staal Bv Method for annealing a strip of steel having a variable thickness in length direction
PL2171102T3 (pl) * 2007-07-19 2018-02-28 Muhr Und Bender Kg Pas stali o zmiennej grubości w kierunku długości
EP2025771A1 (de) * 2007-08-15 2009-02-18 Corus Staal BV Verfahren zur Herstellung eines beschichteten Stahlbandes zur Herstellung von Platinenzuschnitten zur thermomechanischen Formgebung, so hergestelltes Band und Verwendung eines solchen Bandes
EP2045360B1 (de) * 2007-10-02 2011-11-30 ThyssenKrupp Steel Europe AG Verfahren zum Herstellen eines Stahlbauteils durch Warmformen und durch Warmformen hergestelltes Stahlbauteil
DE102007061489A1 (de) 2007-12-20 2009-06-25 Voestalpine Stahl Gmbh Verfahren zum Herstellen von gehärteten Bauteilen aus härtbarem Stahl und härtbares Stahlband hierfür
WO2009090443A1 (en) 2008-01-15 2009-07-23 Arcelormittal France Process for manufacturing stamped products, and stamped products prepared from the same
KR101010971B1 (ko) * 2008-03-24 2011-01-26 주식회사 포스코 저온 열처리 특성을 가지는 성형용 강판, 그 제조방법,이를 이용한 부품의 제조방법 및 제조된 부품
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DK0971044T3 (da) 2003-08-11
FR2780984A1 (fr) 2000-01-14
CA2276911C (fr) 2009-05-05
EP0971044A1 (de) 2000-01-12
FR2780984B1 (fr) 2001-06-22
US6296805B1 (en) 2001-10-02
DE69907816T2 (de) 2004-03-11
DE69907816D1 (de) 2003-06-18
USRE44153E1 (en) 2013-04-16
ES2196740T3 (es) 2003-12-16
BR9902712A (pt) 2000-03-08
JP2000038640A (ja) 2000-02-08
CA2276911A1 (fr) 2000-01-09
JP3931251B2 (ja) 2007-06-13
ATE240419T1 (de) 2003-05-15
USRE44940E1 (en) 2014-06-10

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