EP1319725B1 - Procédé pour la fabrication d'une bande à chaud - Google Patents

Procédé pour la fabrication d'une bande à chaud Download PDF

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Publication number
EP1319725B1
EP1319725B1 EP02025150A EP02025150A EP1319725B1 EP 1319725 B1 EP1319725 B1 EP 1319725B1 EP 02025150 A EP02025150 A EP 02025150A EP 02025150 A EP02025150 A EP 02025150A EP 1319725 B1 EP1319725 B1 EP 1319725B1
Authority
EP
European Patent Office
Prior art keywords
hot
strip
mpa
temperature
less
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
EP02025150A
Other languages
German (de)
English (en)
Other versions
EP1319725A3 (fr
EP1319725A2 (fr
Inventor
Thomas Dr.-Ing. Heller
Werner Zimmermann
Günther Dipl.-Ing. Stich
Bernhard Dr.-Ing. Engl
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
Publication of EP1319725A2 publication Critical patent/EP1319725A2/fr
Publication of EP1319725A3 publication Critical patent/EP1319725A3/fr
Application granted granted Critical
Publication of EP1319725B1 publication Critical patent/EP1319725B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D8/021—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
    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C21D8/0278—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

  • Hot strips are increasingly used today Motor vehicle construction for the production of so-called "crash-relevant" components used. It is about components of a motor vehicle that absorb an excessive amount of kinetic energy in an accident and convert it into deformation energy. Around Minimum weight requirements will be met hot strips desired by users, which have a high, strength of at least 800 MPa and a at the same time good cold formability with a thickness of have one to four millimeters.
  • Hot strips intended for this purpose are, for example known from WO 98/40522 and DE 197 19 546 C2.
  • Around to achieve the required strengths contain the known hot strips in each case at least 0.1% by weight Carbon. In this way, strengths of reach up to 1400 MPa. The comparable high However, carbon levels pull a relatively poor one Weldability of the known hot strips.
  • the object of the invention was a to create cost-effective procedures, which enables the properties of high strength, well deformable hot strip on the respective To optimize the intended use.
  • a steel is processed that has low, has sub-peritectic levels of carbon.
  • Such steel can be on a casting and rolling line to thin slabs or on a belt caster shed cast tape.
  • the raw material thus obtained can be made directly to hot strip with low Roll thicknesses from 0.8 mm to 4 mm, for example.
  • the due to the low carbon content Allows good pourability of the invention
  • the steel used allows a continuous ongoing manufacturing process for hot strip production to use. In this way it can be compared to conventional manufacturing method much simplified Process flow inexpensive a hot strip provide that as soon as you leave the Hot strip mill has a thickness, as in particular in automotive engineering for the production of structural elements Body is needed, and at the same time is that its properties after graduation a suitable cooling by choosing one certain reel temperature for each Purpose can be optimized.
  • the low carbon content becomes strength achieved as otherwise only with higher carbon Steels are possible.
  • Hot rolling is ended according to the invention at temperatures above the Ar 3 temperature, since high hot rolling end temperatures have a favorable effect on the rollability and the state of solution of the microalloying elements.
  • the invention is carried out in an intensive, two-stage manner known per se performed cooling of the band.
  • this cooling becomes a pearlite-free, low-carbon bainitic Structure with hardness-increasing proportions of martensite and Preserved austenite.
  • the choice of the reel temperature is essential since according to the invention by the choice of the reel temperature targeted setting of the desired Material properties takes place. In any case tensile strengths of at least 800 MPa are achieved.
  • High reel temperatures of at least 580 ° C lead to a hot strip that has a high yield ratio and associated with it has a high yield strength.
  • Such hot strips are particularly suitable for Manufacture of weakly deformed components in which a high work hardening of the steel due to lack of Deformation is not usable, but in the case of a high energy absorption capacity in the elastic range is needed.
  • the hot strip is used at temperatures in the range of 450 ° C coiled up to 580 ° C, the hot strip obtained has a lower yield strength ratio and therefore one lower yield strength. At the same time they own it procured hot strips produced according to the invention a high solidification capacity even at low Deformation.
  • Hot strips can be made by lowering the reel temperature below 250 ° C, especially below 100 ° C. at such low reel temperatures becomes a hot strip obtained, which has a minimum tensile strength of 900 MPa with a low yield ratio. It thus has the property profile of a Complex phase steel, such as from the WO98 / 40522 is known. In contrast to the known one However, CP steel has one according to the invention significantly lower carbon content and a accordingly improved weldability.
  • the steel 0.05 wt% to 0.07 wt% Contains carbon. It can also be useful to Increasing the hardness of the steel has a Si content of 0.3% by weight to 0.8% by weight, in particular 0.5% by weight to 0.8% by weight. By calcium treatment leaves influence the sulfide form favorably.
  • a compensating furnace must be provided, the primary material before it is hot rolled, passes.
  • the primary material should be in the compensating furnace heated to a temperature above 1050 ° C be high enough Keep microalloying elements in solution.
  • hot strip produced according to the invention is suitable for a Surface finishing, especially for a electrolytic galvanizing or hot-dip galvanizing.
  • Hot strip produced according to the invention in a special way for the production of highly stressed Structural elements for vehicle body construction.
  • elements can be, for example Side impact beams, bumpers, reinforcement elements, Act frame structures, profiles or similar.
  • Hot strip can be produced by cold forming, whereby especially roll profiling for shaping suitable. An additional heat or other Compensation treatment to increase the strength of the components obtained is not regularly required.
  • Hot strip produced according to the invention can be over it roll out to cold strip. Both are suitable hot strip produced according to the invention and also the result thereof rolled cold strip in a special way for a Hot-dip galvanizing.
  • a steel melt with (in% by weight) 0.058% C, 0.61% Si, 1.72% Mn, 0.015% P, 0.001% S, 0.026% Al, 0.0057% N, 0.34% Cr, 0.117% Ti, 0.01% Cu, 0.021% Ni, 0.0028% Ca, rest of iron and unavoidable impurities is in a casting and rolling system has been cast into one strand, from which subsequently in a continuous Process flow thin slabs were divided. As well The thin slabs then have uninterrupted Homogenization of their temperature distribution and their Structure structure one with a temperature above 1050 ° C lying temperature operated compensating furnace go through before continuously in one Hot rolling line for hot strips A1-A5, B1-B10 and C ready have been hot rolled.
  • Hot strips A1-A5, B1-B10 and C are in a first cooling stage with a cooling rate CR of at least 150 K / s have been intensively cooled to an intermediate temperature ZT, on which they then have at least three and at most cooling break of ten seconds without active cooling have been held.
  • a second cooling stage they are Hot strips then from the intermediate temperature ZT Air or under the influence of a coolant accelerated cooled down to a reel temperature HT Service.
  • Table 1 shows the final rolling temperature ET, the cooling rate CR, the intermediate temperature ZT, the reel temperature HT and the thickness D for the hot strips A1-A5, B1-B10 and C.
  • hot strip ET CR ZT HT D [° C] [K / s] [° C] [° C] [Mm]
  • the hot strips A1-A5 coiled at high reel temperatures HT above 580 ° C. each have a pronounced yield strength R e at tensile strengths between 800 MPa and 900 MPa, which is regularly above 690 MPa, in particular above 740 MPa. Accordingly, they have a high energy absorption capacity in the elastic range and are therefore particularly suitable for the production of components that should be able to safely absorb high forces even in the undeformed state or with little deformation.
  • the hot strips B1-B10 coiled in the middle reel temperature range from 450 ° C to 580 ° C also regularly achieve tensile strengths that are above 800 MPa and below 900 MPa.
  • the hot strips B1-B10 have a continuous transition from elastic to plastic deformation, for which a yield strength R p0.2 of less than 690 MPa and a lower yield strength ratio R p0.2 / R m are determined compared to the hot strips A1-A5 has been.
  • the hot strips B1-B10 can therefore be cold formed particularly well into components that must have a high level of hardening capacity even with low deformation.
  • Hot strips of the type in question are here additional hot strips B11, B12 have been produced.
  • the at their manufacture set Hot strip end temperature ET (900 ° C), cooling rate CR and intermediate temperature ZT (600 ° C) was there comparable to that in the production of hot strips B1 parameters set up to B10.
  • the reel temperature HT in the production of the hot strip B11 was 510 ° C, while on during the production of the hot strip B12 530 ° C was set.
  • the hot bands B11, B12 are then hot-dip galvanized. It is the same Hot strip C e has been subjected to hot-dip galvanizing.
  • hot strips B11, B12 regularly have particularly high strengths R m of at least 880 MPa at annealing temperatures which are less than 800 ° C. If the hot strip C is annealed at annealing temperatures of less than 800 ° C, the strengths R m achieved are at least 900 MPa.
  • the yield strength R e of the galvanized hot strips B11, B12, C is at least at the level of the hot strips B11, B12 and C.
  • the level of uniform elongation A gl and the elongation at break A80 of the galvanized hot strips B11, B12 and C is above the level of the hot strips B11, B12, C from which they were cold-rolled for each of the annealing temperatures.

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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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (12)

  1. Procédé pour la fabrication d'une bande à chaud d'une résistance à la traction d'au moins 800 N/mm2, pour lequel, au cours d'un déroulement continu des opérations,
    un acier, qui contient (en % en poids) C 0,03 à 0,10 % Si ≤ 0,8 % Mn 1,2 à 2,0 % Al 0,02 à 0,06 % Cr ≤ 0,5 % Ti ≤ 0,2 % Nb ≤ 0,08 % Ca < 0,005 % Cu < 0,05 % Ni < 0,05 % P < 0,02 % S < 0,005 % N < 0,01 % et comme
    reste du fer, de même que des impuretés inévitables, est coulé en un matériau préliminaire, tel des brames minces ou une bande coulée,
    le matériau préliminaire est laminé à chaud en une bande à chaud à une température finale située au-dessus de la température Ar3,
    la bande à chaud obtenue est refroidie dans une première section de refroidissement à une vitesse de refroidissement d'au moins 150 K/s jusqu'à une température intermédiaire de 500 °C à 700 °C et
    après une pause de refroidissement durant de trois à dix secondes, la bande à chaud est refroidie dans une deuxième section de refroidissement à une température de bobinage qui est déterminée d'après les critères suivants :
    a) Pour des bandes à chaud dont la limite d'élasticité est supérieure à 690 MPa et dont la résistance à la traction est inférieure à 900 MPa :
    température de bobinage > 580 °C
    b) Pour des bandes à chaud dont la limite d'élasticité atteint 690 MPa au plus et dont la résistance à la traction est inférieure à 900 MPa :
    450 °C ≤ température de bobinage ≤ 580 °C
    c) Pour des bandes à chaud dont la résistance à la traction est supérieure à 900 MPa :
    température de bobinage ≤ 250 °C
  2. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'acier contient de 0,05 % en poids à 0,07 % en poids de carbone.
  3. Procédé selon la revendication 1, caractérisé en ce que l'acier contient de 0,3 % en poids à 0,8 % en poids de silicium.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'acier contient plus de 0,4 % en poids, en particulier au moins 0,5 % en poids de silicium.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant qu'il soit laminé à chaud, le matériau préliminaire traverse un four de compensation dans lequel il est réchauffé à une température au-dessus de 1050 °C.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la température de bobinage est de moins de 100 °C.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande à chaud est soumise à un ennoblissement de surface, en particulier à une galvanisation électrolytique ou à une galvanisation au bain.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande à chaud est formée à froid selon un profilage par roulage pour donner un élément de construction.
  9. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la bande à chaud est laminée à froid en une bande à froid.
  10. Procédé selon la revendication 9, caractérisé en ce que la bande à froid est soumise à une galvanisation au bain.
  11. Procédé selon la revendication 10, caractérisé en ce que la résistance à la traction de la bande à froid galvanisée est d'au moins 850 MPa.
  12. Utilisation d'une bande à chaud qui est fabriquée d'après un procédé élaboré selon l'une quelconque des revendications 1 à 8 pour la fabrication d'éléments de structure pour des carrosseries d'automobile.
EP02025150A 2001-12-13 2002-11-09 Procédé pour la fabrication d'une bande à chaud Expired - Lifetime EP1319725B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10161465A DE10161465C1 (de) 2001-12-13 2001-12-13 Verfahren zum Herstellen von Warmband
DE10161465 2001-12-13

Publications (3)

Publication Number Publication Date
EP1319725A2 EP1319725A2 (fr) 2003-06-18
EP1319725A3 EP1319725A3 (fr) 2003-12-10
EP1319725B1 true EP1319725B1 (fr) 2004-10-20

Family

ID=7709195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02025150A Expired - Lifetime EP1319725B1 (fr) 2001-12-13 2002-11-09 Procédé pour la fabrication d'une bande à chaud

Country Status (4)

Country Link
EP (1) EP1319725B1 (fr)
AT (1) ATE280248T1 (fr)
DE (2) DE10161465C1 (fr)
ES (1) ES2231638T3 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101019791B1 (ko) † 2002-12-24 2011-03-04 신닛뽄세이테쯔 카부시키카이샤 용접 열영향부의 내연화성과 버링성이 우수한 고강도 강판
ES2325962T3 (es) * 2006-10-30 2009-09-25 Thyssenkrupp Steel Ag Procedimiento para fabricar productos planos de acero a partir de un acero multifasico microaleado con boro.
FI20095528A (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
WO2012127125A1 (fr) * 2011-03-24 2012-09-27 Arcelormittal Investigatión Y Desarrollo Sl Tôle d'acier laminée à chaud et procédé de fabrication associé
DE102012013113A1 (de) * 2012-06-22 2013-12-24 Salzgitter Flachstahl Gmbh Hochfester Mehrphasenstahl und Verfahren zur Herstellung eines Bandes aus diesem Stahl mit einer Mindestzugfestigkleit von 580MPa
KR102099488B1 (ko) * 2012-07-30 2020-04-10 타타 스틸 네덜란드 테크날러지 베.뷔. 탄소강의 강 스트립 제조 방법
HUE044411T2 (hu) 2014-07-03 2019-10-28 Arcelormittal Eljárás ultranagyszilárdságú, bevont vagy bevonat nélküli acéllemez elõállítására, és az eljárással elõállított lemez
DE112015005690T8 (de) 2014-12-19 2018-04-19 Nucor Corporation Warmgewalztes martensitisches Leichtbau-Stahlblech und Verfahren zum Herstellen desselben
CN108431247B (zh) 2015-12-29 2019-10-01 安赛乐米塔尔公司 用于生产超高强度镀锌扩散退火钢板的方法和获得的镀锌扩散退火钢板
DE102017209982A1 (de) * 2017-06-13 2018-12-13 Thyssenkrupp Ag Hochfestes Stahlblech mit verbesserter Umformbarkeit
DE102020203564A1 (de) * 2020-03-19 2021-09-23 Sms Group Gmbh Verfahren zum Herstellen eines gewalzten Mehrphasenstahlbandes mit Sondereigenschaften
CN113481436A (zh) * 2021-06-29 2021-10-08 鞍钢股份有限公司 一种800MPa级热轧复相钢及其生产方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5850300B2 (ja) * 1979-12-15 1983-11-09 新日本製鐵株式会社 加工性に優れ且つ加工後人工時効硬化性の高い高強度低降伏比高延性複合組織鋼板の製造方法
DE19719546C2 (de) * 1996-07-12 1998-12-03 Thyssen Stahl Ag Warmband aus Stahl und Verfahren zu seiner Herstellung
DE19710125A1 (de) * 1997-03-13 1998-09-17 Krupp Ag Hoesch Krupp Verfahren zur Herstellung eines Bandstahles mit hoher Festigkeit und guter Umformbarkeit
DE19911287C1 (de) * 1999-03-13 2000-08-31 Thyssenkrupp Stahl Ag Verfahren zum Erzeugen eines Warmbandes
EP1143022B1 (fr) * 1999-09-16 2010-04-14 JFE Steel Corporation Procede de production d' une plaque fine d'acier a resistance mecanique elevee
ATE490349T1 (de) * 1999-09-29 2010-12-15 Jfe Steel Corp Stahlblech und verfahren zu dessen herstellung
JP3858540B2 (ja) * 1999-11-30 2006-12-13 Ｊｆｅスチール株式会社 材質均一性に優れた高加工性熱延高張力鋼板の製造方法

Also Published As

Publication number Publication date
EP1319725A3 (fr) 2003-12-10
DE50201348D1 (de) 2004-11-25
EP1319725A2 (fr) 2003-06-18
DE10161465C1 (de) 2003-02-13
ATE280248T1 (de) 2004-11-15
ES2231638T3 (es) 2005-05-16

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