EP1017863B1 - Procedes de production d'elements constitutifs en acier sensible au vieillissement, vernis au vernis a cuire - Google Patents

Procedes de production d'elements constitutifs en acier sensible au vieillissement, vernis au vernis a cuire Download PDF

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Publication number
EP1017863B1
EP1017863B1 EP98943833A EP98943833A EP1017863B1 EP 1017863 B1 EP1017863 B1 EP 1017863B1 EP 98943833 A EP98943833 A EP 98943833A EP 98943833 A EP98943833 A EP 98943833A EP 1017863 B1 EP1017863 B1 EP 1017863B1
Authority
EP
European Patent Office
Prior art keywords
cold strip
cold
storage
strip
ageing
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
EP98943833A
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German (de)
English (en)
Other versions
EP1017863A1 (fr
Inventor
Rolf Bode
Ilse Heckelmann
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 EP1017863A1 publication Critical patent/EP1017863A1/fr
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    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0442—Flattening; Dressing; Flexing

Definitions

  • the invention relates to a method for producing dent-resistant enamelled components made of cold strip, which is made of age-sensitive steel with high bake-hardening potential, especially of more than 70 N / mm2, consists.
  • Aging can be caused by the diffusion of dissolved carbon and / or nitrogen.
  • the influence of temperature on the aging time can be estimated as follows: The times t 1 and t 2 required for the same aging effects behave in the opposite way to the associated temperature-dependent diffusion coefficients of carbon in the ⁇ -iron.
  • Table 1 shows the factors calculated according to equation [1] for the time delay of an aging effect due to reduced temperatures. At -10 ° C, for example, the aging time is extended 62 times compared to aging at room temperature. Aging temperature (° C) 10 5 0 -5 -10 factor 3.6 7 14 29 62
  • Table 2 shows the factors for the delay in an aging effect caused by dissolved nitrogen, calculated according to equation [2]. Aging temperature (° C) 10 5 0 -5 -10 factor 3.1 5.5 10 19 36.5
  • the invention is based on the object Process for the aging-free further processing of Cold strips made of a steel sensitive to aging high bake hardening potential for production stoved component to be specified.
  • Equation [3] follows from equation [2] and relates on a steel that due to nitrogen aging after exceeding a storage time of more than 2 days at 20 ° C no longer processed properly can be. Because of the lower diffusion rate of carbon compared to Nitrogen is caused by both elements when aging just taking nitrogen into account is sufficient.
  • Fig. 1 shows the temporal development of R eh -R el at room temperature, 60 ° C and 100 ° C.
  • the value R eh -R el 2 N / mm 2 can be seen as a limit for error-free processing. If the values are higher than 2 N / mm 2 , flow figures must be expected, since there is a pronounced load drop in the stress-strain curve.
  • Table 4 shows the mechanical values of the steel, its 0.2% proof stress (Rp 0.2 ), tensile strength (Rm), elongation (A80), uniform elongation (Ag), the r-value and its bake-hardening potential BH 0 and the contents of dissolved C and N in the initial state are listed.
  • Rp 0.2 N / mm 2 Rm N / mm 2 A80% Ag% r-value BH 0 N / mm 2 C gel ppm N gel.
  • a steel with high levels of dissolved carbon and / or nitrogen, which is not at room temperature is resistant to aging by using one of the both methods according to the invention even after a long time Storage time without risk of surface defects to be processed further.
  • the advantage of the method according to the invention is that Harnessing a high bake-hardening potential that Compared to conventional aging-resistant at room temperature Bake hardening steels higher Dent resistance of the components made from it allows.

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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 Steel (AREA)

Claims (3)

  1. Procédé de production d'un élément constitutif verni au vernis à cuire, résistant au voilement, à partir d'un feuillard laminé à froid constitué d'acier sensible au vieillissement à potentiel de hardening Bake élevé, en particulier de plus de 70 N/mm2, caractérisé en ce que le feuillard laminé à froid est amené par dressage dans un état exempt d'allongement à la limite élastique, dans lequel la condition Reh - Rel < 2N/mm2 est remplie,
       en ce que le feuillard laminé à froid est ensuite stocké à une température de stockage située au-dessous de la température ambiante, pendant une durée de stockage dont la longueur est au maximum égale à la longueur de la période à la fin de laquelle la valeur critique de la résistance au vieillissement, à laquelle la condition Reh - Re1 = 2 N/mm2 est remplie et qui est fonction de la température de stockage respective, est atteinte,
       en ce que le feuillard laminé à froid est formé à froid après le stockage pour obtenir un élément constitutif et
       en ce que l'élément constitutif est, pour terminer, verni au vernis à cuire.
  2. Procédé selon la revendication 1, caractérisé en ce que la température de stockage T en [K] du feuillard laminé à froid est choisie en fonction de la durée de stockage t en [h] prévue, suivant l'équation T = 9225 / (31,48 - ln (48/t)) dans laquelle
    T :
    température de stockage en [K]
    t :
    durée de stockage en [h].
  3. Procédé de production d'un élément constitutif verni au vernis à cuire, résistant au voilement, à partir d'un feuillard laminé à froid constitué d'acier sensible au vieillissement à potentiel de hardening Bake élevé, en particulier de plus de 70 N/mm2, caractérisé en ce que
       le feuillard laminé à froid est stocké, sans avoir été dressé, à température ambiante pendant une durée de stockage,
       en ce que le feuillard laminé à froid, après écoulement de la durée de stockage, est amené par dressage dans un état exempt d'allongement à la limite élastique, dans lequel la condition Reh - Re1 < 2 N/mm2 est remplie,
       en ce que le feuillard laminé à froid dressé est finalement formé à froid pour obtenir un élément constitutif et
       en ce que l'élément constitutif est, pour terminer, verni au vernis à cuire.
EP98943833A 1997-09-12 1998-08-04 Procedes de production d'elements constitutifs en acier sensible au vieillissement, vernis au vernis a cuire Expired - Lifetime EP1017863B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19740148 1997-09-12
DE19740148A DE19740148C1 (de) 1997-09-12 1997-09-12 Verfahren zur Herstellung von beulfesten einbrennlackierten Bauteilen aus alterungsempfindlichem Stahl
PCT/EP1998/004845 WO1999014384A1 (fr) 1997-09-12 1998-08-04 Procedes de production d'elements constitutifs en acier sensible au vieillissement, vernis au vernis a cuire

Publications (2)

Publication Number Publication Date
EP1017863A1 EP1017863A1 (fr) 2000-07-12
EP1017863B1 true EP1017863B1 (fr) 2002-05-08

Family

ID=7842158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98943833A Expired - Lifetime EP1017863B1 (fr) 1997-09-12 1998-08-04 Procedes de production d'elements constitutifs en acier sensible au vieillissement, vernis au vernis a cuire

Country Status (7)

Country Link
US (1) US6726786B1 (fr)
EP (1) EP1017863B1 (fr)
JP (1) JP2001516807A (fr)
AT (1) ATE217356T1 (fr)
DE (1) DE19740148C1 (fr)
ES (1) ES2177049T3 (fr)
WO (1) WO1999014384A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1051307A (fr)
US3537913A (en) 1967-04-17 1970-11-03 Nat Steel Corp Cyclic stressing for suppression of strain aging
JPS5215046B2 (fr) * 1972-06-22 1977-04-26
US3909311A (en) 1974-08-05 1975-09-30 Hitachi Ltd Shadow mask for use in color picture tube and method for fabricating same
JPS5157623A (en) * 1974-11-18 1976-05-20 Nippon Kokan Kk Takaitosoyakitsukekokaseitosugureta hijikoseiomotsukochoryokureienkohanno seizohoho
US4358325A (en) * 1979-08-31 1982-11-09 General Motors Corporation Method of treating low carbon steel for improved formability
US4410372A (en) 1981-06-10 1983-10-18 Nippon Steel Corporation Process for producing deep-drawing, non-ageing, cold rolled steel strips having excellent paint bake-hardenability by continuous annealing
NL8502145A (nl) * 1985-07-29 1987-02-16 Hoogovens Groep Bv Hard blik vervaardigd uit a1-rustig, continugegoten, kool mangaanstaal en werkwijze voor de vervaardiging van zulk blik.
DE3528782A1 (de) * 1985-08-10 1987-02-19 Hoesch Stahl Ag Verfahren zum herstellen eines alterungsbestaendigen bandstahles mit hoher kaltumformbarkeit
DE3841870A1 (de) * 1988-12-13 1990-06-21 Westfalenstahl Kalt Und Profil Stahl zur herstellung von stahlbaendern fuer die fertigung von schattenmasken
FR2724946B1 (fr) 1994-09-23 1996-12-13 Lorraine Laminage Procede de fabrication d'un acier presentant une bonne aptitude a la mise en forme et une bonne resistance a l'indentation
DE19622164C1 (de) * 1996-06-01 1997-05-07 Thyssen Stahl Ag Verfahren zur Erzeugung eines kaltgewalzten Stahlbleches oder -bandes mit guter Umformbarkeit

Also Published As

Publication number Publication date
US6726786B1 (en) 2004-04-27
DE19740148C1 (de) 1999-07-15
JP2001516807A (ja) 2001-10-02
ATE217356T1 (de) 2002-05-15
ES2177049T3 (es) 2002-12-01
EP1017863A1 (fr) 2000-07-12
WO1999014384A1 (fr) 1999-03-25

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