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EP1399598B1 - Procede pour fabriquer des produits en acier de grande resistance et de bonne malleabilite, formes a froid a partir d'un feuillard lamine a chaud - Google Patents

Procede pour fabriquer des produits en acier de grande resistance et de bonne malleabilite, formes a froid a partir d'un feuillard lamine a chaud Download PDF

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Publication number
EP1399598B1
EP1399598B1 EP02738172A EP02738172A EP1399598B1 EP 1399598 B1 EP1399598 B1 EP 1399598B1 EP 02738172 A EP02738172 A EP 02738172A EP 02738172 A EP02738172 A EP 02738172A EP 1399598 B1 EP1399598 B1 EP 1399598B1
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EP
European Patent Office
Prior art keywords
cold
hot
product
temperature
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.)
Expired - Lifetime
Application number
EP02738172A
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German (de)
English (en)
Other versions
EP1399598A1 (fr
EP1399598B2 (fr
Inventor
Thomas Heller
Bernhard Engl
Günter STICH
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
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Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1399598A1 publication Critical patent/EP1399598A1/fr
Publication of EP1399598B1 publication Critical patent/EP1399598B1/fr
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Publication of EP1399598B2 publication Critical patent/EP1399598B2/fr
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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
    • C21D8/0221—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
    • 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
    • C21D8/0236—Cold 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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

Definitions

  • the invention relates to a method for producing a high-strength, cold-formed from a hot strip Steel product with good formability.
  • a method of making high strength having hot strip is from DE 197 10 125 A1 known.
  • This formability can be according to the Process known from DE 197 10 125 A1 be increased that the hot strip after coiling annealing in the temperature range from 500 ° C to 850 ° C is subjected.
  • the advantages for components offers, overall still high strength, before all yield strength, with good formability have to.
  • you can particularly high strengths with extraordinary low yield strength ratios or equivalent high strengthening with good elongation values achieved become.
  • this is suitable annealed hot strip for cold rolling, in which a Degree of deformation of at least 30% is reached.
  • cold-formed strip then at temperatures Continuously annealed from 700 ° C to 900 ° C a cold-formed sheet product of high Strength, further improved yield strength ratio and good hardening behavior.
  • the object of the invention was a method to create a cold formed product, that with increased strength in the cold-formed state high elasticity and accordingly good Formability.
  • the invention is based on the surprising Finding that the strength-increasing Properties of the steels according to the invention microalloying elements contained in the inventive Generation of the hot strip by annealing the from the Hot strip obtained after coiling by cold working Activate the product and get cold formed Products with particularly high strengths and one too Produce good formability in the cold-formed state leave without a procedural costly remuneration would be required.
  • crash-relevant components such as Bumpers, side impact beams, reinforcement elements, available to the full extent in the event of a Collision with other objects on a large scale to be able to convert kinetic energy into forming energy.
  • the method according to the invention is also suitable especially for the production of components, their dimensions and Dimensional requirements are just as high as to their strength in use.
  • a typical example for such an application provide frames for screens that are in picture tubes of televisions or Computer monitors the shadow mask due to the Thermal stress during their assembly and their Operation under uniform tension in a fixed defined level.
  • the required high The so cold-formed component then receives strength in the According to the invention after the cold working performed heat treatment, so the result is a precisely shaped, high-strength component with high Yield strength is available.
  • An additional Remuneration leading to the delay of the component and a The surface can then be impaired not necessary anymore.
  • the operating parameters including the reel temperature can be selected that by the presence of a sufficient amount of microalloying elements possible per se Hardness increase in the course of reeling is not achieved, but that the microalloy elements after reeling are present in the undissolved, dissolved state. Out for this reason the reel temperature is according to the invention always chosen so that they are at a clear distance is below the temperature at which the Elimination maximum of the microalloying elements reached would.
  • the steel alloy used according to the invention comprises Steel compositions that make up depending on the respective composition and production conditions Dual phase steels, bainitic steels or Have complex phase steels manufactured. To be aimed for basically steels with a fine grain multiphase structure in which bainite, ferrite, and martensite Residual austenite depending on the type of steel dependent scope are included.
  • the hot rolling start temperature is like this chosen that the microalloying elements largely stay loosened in the steel so that they can last for the Effected step of the method according to the invention Effects are available.
  • the Rolling temperature for this purpose at least 1050 ° C be.
  • thin slab or Thin strip casting process with which it is due to the Circumstance that the need for reheating of the primary material or a solution of Microalloying elements do not exist and on the other hand the cooling speeds of the strand are high can, particularly safely, is possible Microalloying elements until the beginning of the To keep the hot rolling process largely solved.
  • the hot rolling end temperature should preferably be in the austenite region, that is to say above the Ar 3 temperature, in order to obtain the fine-grained, multi-phase structure sought after according to the invention.
  • composition of the structure of the hot strip obtained is obtained by chemical Properties, the warm-up, rolling and cooling conditions as well as the reel temperatures. It has shown that the effect achieved according to the invention increase in strength and formability Sets dual-phase steels particularly safely when the reel temperature is a maximum of 300 ° C. For steels with a predominantly bainitic structure, this effect safely reached at reel temperatures of up to 350 ° C 450 ° C. Complex phase steels should be preferred can be coiled at temperatures from 450 ° C to 550 ° C.
  • steels of the type used in accordance with the invention have a high strength of at least 550 N / mm 2 .
  • the steels harden very strongly.
  • the elongation decreases significantly, so that a product that is high-strength but difficult to deform is obtained.
  • cold-formed components of this type have only a small forming reserve and a correspondingly reduced energy absorption capacity. As such, for example, they are only suitable to a limited extent for the production of components which are to be used as bumpers in crash-prone areas of an automobile.
  • Typical annealing temperatures during the Cold deformation of the following glow is in the range of 450 ° C to 700 ° C, preferably in the range of 550 ° C to 650 ° C.
  • Annealing time and annealing temperature are in the limited frame interchangeable. That is, at high temperatures are only short holding times required and vice versa. Accordingly, the Heat treatment as carried out separately Treatment step in a hood or in a Continuous annealing.
  • One in a conventional way in conditions leading to a complete Recrystallization would result in annealing treatment would nullify the effect achieved by the invention do.
  • the annealing step in a heat treatment that is from the hot strip cold-formed product in the course of its further processing is subjected anyway.
  • this step it can be for example a galvanizing or another Process for coating or passivation of the Act on the surface of the cold-formed product in the range provided for the annealing treatment Temperatures is carried out.
  • the degrees of deformation achieved in the course of cold forming amount to at least 2% until the limit shape change, whereby yourself through the procedure according to the invention effects achieved especially if the Degree of cold deformation 5% to 20%, in particular 5% to 10%.
  • the cold deformation can be, for example, as Roll profiling, drawing, pressing or Hydroforming can be performed. On Cold rolling at relatively low Degrees of deformation are also suitable for this.
  • the micro-alloying element comes in accordance with the invention Steel at least one of the elements Ti, Nb and / or V for use. Of course, these items can combined in amounts to be triggered that caused at the end of the method according to the invention Elimination process are sufficient. Especially however, the use of Ti, which is preferred through a particularly favorable excretion behavior distinguished. If Ti is preferred Embodiment of the invention as the only one Microalloying element used, so should its content be at least 3.4 times the N content, in order a sufficient solution potential of the Ensure microalloying element. Preferably lies the Ti content of the steel for this purpose in the range 0.07, to 0.15 wt%, while the nitrogen content is preferably less than 0.007% by weight. With Ti contents on this scale the formation of Fine deposits with a hardening effect are optimal supported.
  • the Al content is preferably in the range from 0.015 to 0.08% by weight. or 0.5 to 1.5% by weight.
  • Steel sheets produced according to the invention are suitable preferred for cold forming into components on their Strength with good elongation behavior and accordingly good deformation behavior as well as high high dimensional accuracy are. They are characterized by sheets according to the invention produced components by low weight and high Energy absorption capacity.
  • Steel sheets produced according to the invention is the production of frames for flat screens.
  • Steel sheets manufactured according to the invention for vehicle bodies or attachments produce the one hand particularly firm and on the other hand, for example, in the event of a collision with another vehicle the on impact kinetic energies in deformation energy need to convert.
  • These include Side members, so-called “Crash boxes”, chassis parts, hollow structure parts and Reinforcing parts such as the A, B or C pillar of the Automobile body.
  • Hot strip produced according to the invention is basically for Suitable for galvanizing. However, one is relative low temperature, especially piecewise, hot-dip galvanizing is preferable, Galvanizing at temperatures above 750 ° C are less suitable because the with regard to the effect achieved according to the invention critical temperatures in the processed Workpiece can be exceeded.
  • a steel composed according to Table 1 was cast on a continuous casting plant to a pre-slab, which was then hot-rolled as a starting material at a temperature of 1125 ° C. in a hot strip mill to a hot strip.
  • the hot rolling end temperature was 925 ° C.
  • the reel temperature was 475 ° C.
  • the hot strip is pickled and delivered to a cold rolling mill in the pickled state.
  • the plates of group G1 are closed None for comparison purposes following the cold deformation Annealing has been carried out while the sheets of Group G2 at 500 ° C, the sheets of group G3 at 550 ° C, the plates of group G4 at 600 ° C and the Sheet of group G5 at 650 ° C in a hood furnace for annealed for one hour each and then on Air have been cooled.
  • the strength values obtained are significantly improved in comparison with the only cold-formed and not heat-treated sheets G1.1-G1.5.
  • a uniform expansion A gl is achieved by the heat treatment carried out after the cold working, which corresponds approximately to the uniform expansion A gl of the non-cold-formed and non-heat-treated sheet Gl1.0. Accordingly, the cold-formed and subsequently heat-treated steels produced according to the invention have particularly good formability and an equally good energy absorption capacity.
  • Table 3 shows a second example of a steel composition used according to the invention.
  • a correspondingly alloyed steel was melted and cast into slabs.
  • the slabs were then reheated to a temperature of more than 1150 ° C. and hot-rolled with a hot rolling temperature of at least 850 ° C.
  • the tape sample T3.2 clearly shows that high-strength in the procedure according to the invention let cold-formed sheet metal products are obtained which, like a Comparison of the ductility values shows, regarding their Formability superior to the undeformed tape sample T3.0 are.
  • An example of a particularly advantageous use of a steel produced according to the invention consists in the Manufacture of frames in which the shadow masks of TV tubes are held. To blacken the one Such a tight shadow mask will Frame with the shadow mask for a sufficient time exposed to a temperature that is typically approx. Is 570 ° C.
  • the hot strip is deformable by cold working and then in the course of the blackening of him held shadow mask for a sufficient time the temperature required for blackening the strength of the frame increases to.
  • the process consists in the production of galvanized Side impact beams or other crash-relevant Components for vehicle bodies.
  • This will start with the respective from hot strip produced according to the invention Component, for example, through a deep-drawing operation cold formed.
  • the cold-formed component is then at Temperatures in the range of 470 ° C for galvanizing subjected.
  • Component also kept at a temperature level, in which the increase achieved according to the invention Elasticity and strength sets.
  • the so obtained Side impact beam exhibits due to its good Elasticity and high strength at the same time particularly high energy absorption capacity which it does in the event of a collision with another Vehicle a large part of the free convert kinetic energy into deformation energy and the space necessary for the survival of the occupants can secure.

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

Claims (17)

  1. Procédé pour fabriquer un produit très résistant possédant une bonne capacité de déformation et formé à froid à partir d'un feuillard chaud, selon lequel on coule
    un acier comportant (en % en poids): C 0,01 - 0,25 %, Si 0,01 - 1,50 %, Mn 0,50 - 2,00 %, P ≤ 0,08 %, S ≤ 0,01 %, Al 0,001 - 1,50 %, Cr ≤ 0,60 %, Mo ≤ 0,60 %, N < 0,02 %,
    ainsi qu'au moins un élément de micromélange tiré du groupe Ti ≤ 0,20 %, Nb ≤ 0,06 %, V ≤ 0,15 %,
    le reste étant formé de fer et d'impuretés usuelles pour former un produit brut, comme par exemple des brames, des brames minces ou un feuillard coulé,
    selon lequel on lamine à chaud le produit brut à partir d'une température initiale de laminage à chaud, pour laquelle les éléments du microalliage restent essentiellement dissous, pour former un feuillard chaud,
    selon lequel on enroule le feuillard chaud à une température de renvidage inférieure à 600°C,
    selon lequel on déforme ensuite à froid du feuillard chaud pour former un produit, avec un degré de déformation à froid qui est égal au moins à 2 % et correspond au maximum au changement de forme limite, et
    selon lequel on applique un recuit au produit obtenu par déformation à froid, à des températures et pendant des durées, qui se situent au-dessous des températures et des durées nécessaires pour la recristallisation complète.
  2. Procédé selon la revendication 1, caractérisé en ce que l'acier contient en tant qu'élément unique de microalliage du Ti et que le rapport de la teneur en Ti à la teneur en N est égal au moins à 3,4.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température finale de laminage à chaud est égale au moins à la température de Ar3.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température du renvidage est inférieure à 300°C.
  5. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la température de renvidage est de 350-450°C.
  6. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la température de renvidage est égale à 450-550°C.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le degré de déformation à froid est égal à 5 % - 20 % et notamment va de 5 % à 10 %.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température de recuit est égale à 550°C-600°C.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que le recuit est exécuté en continu.
  10. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que le recuit est exécuté dans un four à hotte.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que le matériau brut est produit sous la forme d'un feuillard coulé dans une installation de laminage de coulée continue.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que le produit fabriqué par déformation à froid est un cadre pour des écrans plats.
  13. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que le produit fabriqué par déformation à froid est un composant pour la fabrication de carrosseries de véhicules automobiles ou d'un composant rapporté.
  14. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on obtient le produit par déformation exécutée à froid sous haute pression interne.
  15. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on soumet le produit déformé à froid, à une galvanisation.
  16. Procédé selon la revendication 15, caractérisé en ce qu'on exécute la galvanisation sous la forme d'une galvanisation à chaud.
  17. Procédé selon la revendication 15 ou 16, caractérisé en ce que la galvanisation s'effectue à des températures autour de 460°C.
EP02738172A 2001-06-26 2002-06-21 Procede pour fabriquer des produits en acier de grande resistance et de bonne malleabilite, formes a froid a partir d'un feuillard lamine a chaud Expired - Lifetime EP1399598B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10130774 2001-06-26
DE10130774A DE10130774C1 (de) 2001-06-26 2001-06-26 Verfahren zum Herstellen von hochfesten, aus einem Warmband kaltverformten Stahlprodukten mit guter Dehnbarkeit
PCT/EP2002/006870 WO2003002772A1 (fr) 2001-06-26 2002-06-21 Procede pour fabriquer des produits en acier de grande resistance et de bonne malleabilite, formes a froid a partir d'un feuillard lamine a chaud

Publications (3)

Publication Number Publication Date
EP1399598A1 EP1399598A1 (fr) 2004-03-24
EP1399598B1 true EP1399598B1 (fr) 2004-10-13
EP1399598B2 EP1399598B2 (fr) 2011-02-23

Family

ID=7689496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02738172A Expired - Lifetime EP1399598B2 (fr) 2001-06-26 2002-06-21 Procede pour fabriquer des produits en acier de grande resistance et de bonne malleabilite, formes a froid a partir d'un feuillard lamine a chaud

Country Status (5)

Country Link
EP (1) EP1399598B2 (fr)
AT (1) ATE279540T1 (fr)
DE (2) DE10130774C1 (fr)
ES (1) ES2230500T3 (fr)
WO (1) WO2003002772A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2855184B1 (fr) * 2003-05-19 2006-05-19 Usinor Tole laminee a froid et aluminiee en acier dual phase a tres haute resistance pour ceinture anti-implosion de televiseur, et procede de fabrication de cette tole
US9149868B2 (en) 2005-10-20 2015-10-06 Nucor Corporation Thin cast strip product with microalloy additions, and method for making the same
US9999918B2 (en) 2005-10-20 2018-06-19 Nucor Corporation Thin cast strip product with microalloy additions, and method for making the same
US10071416B2 (en) 2005-10-20 2018-09-11 Nucor Corporation High strength thin cast strip product and method for making the same
DE112006003169B4 (de) * 2005-12-01 2013-03-21 Posco Stahlbleche zum Warmpressformen mit ausgezeichneten Wärmebehandlungs- und Schlageigenschaften, daraus hergestellte Warmpressteile und Verfahren zu deren Herstellung
US20110277886A1 (en) 2010-02-20 2011-11-17 Nucor Corporation Nitriding of niobium steel and product made thereby
US20180209011A1 (en) 2015-07-17 2018-07-26 Salzgitter Flachstahl Gmbh Method of producing a hot strip of a bainitic multi-phase steel having a zn-mg-al coating, and a corresponding hot strip
DE102016005532A1 (de) * 2016-05-02 2017-11-02 Vladimir Volchkov Stahl
CN109023105B (zh) * 2018-09-25 2020-11-13 首钢集团有限公司 一种汽车结构用热轧带钢及制造方法
CN110684932B (zh) * 2019-10-12 2021-06-08 唐山钢铁集团有限责任公司 一种1500MPa级冷成形带钢及其生产方法
CN116497266A (zh) * 2022-01-19 2023-07-28 宝山钢铁股份有限公司 一种热轧高强度高塑性钢及其制造方法
EP4403662A1 (fr) 2023-01-18 2024-07-24 voestalpine Stahl GmbH Acier laminé à froid et son procédé de production

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3950190A (en) † 1974-11-18 1976-04-13 Youngstown Sheet And Tube Company Recovery-annealed cold-reduced plain carbon steels and methods of producing
US3963531A (en) † 1975-02-28 1976-06-15 Armco Steel Corporation Cold rolled, ductile, high strength steel strip and sheet and method therefor
US4082576A (en) † 1976-10-04 1978-04-04 Youngstown Sheet And Tube Company Ultra-high strength low alloy titanium bearing flat rolled steel and process for making
DE19710125A1 (de) * 1997-03-13 1998-09-17 Krupp Ag Hoesch Krupp Verfahren zur Herstellung eines Bandstahles mit hoher Festigkeit und guter Umformbarkeit
FR2796083B1 (fr) † 1999-07-07 2001-08-31 Usinor Procede de fabrication de bandes en alliage fer-carbone-manganese, et bandes ainsi produites

Also Published As

Publication number Publication date
DE50201321D1 (de) 2004-11-18
EP1399598A1 (fr) 2004-03-24
WO2003002772A1 (fr) 2003-01-09
ES2230500T3 (es) 2005-05-01
EP1399598B2 (fr) 2011-02-23
DE10130774C1 (de) 2002-12-12
ATE279540T1 (de) 2004-10-15

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