EP1017863A1 - 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

Info

Publication number
EP1017863A1
EP1017863A1 EP98943833A EP98943833A EP1017863A1 EP 1017863 A1 EP1017863 A1 EP 1017863A1 EP 98943833 A EP98943833 A EP 98943833A EP 98943833 A EP98943833 A EP 98943833A EP 1017863 A1 EP1017863 A1 EP 1017863A1
Authority
EP
European Patent Office
Prior art keywords
cold
aging
strip
coated
enamelled
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.)
Granted
Application number
EP98943833A
Other languages
German (de)
English (en)
Other versions
EP1017863B1 (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
Application granted granted Critical
Publication of EP1017863B1 publication Critical patent/EP1017863B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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, stove-enamelled components from cold-rolled and trained strip (cold strip) made of age-sensitive steel with a high bake-hardening potential, in particular of more than 70 N / mm 2 .
  • steels In order to achieve a high bake-hardening potential, steels are generally used which, in addition to dissolved carbon, also contain dissolved nitrogen. Examples of this are unsteady steels.
  • the storage of cold strips from such steels at room temperature leads to aging processes after only a short time of one or two days, which makes perfect further processing, in particular cold forming, impossible. The surface quality of the cold strips will also be affected.
  • 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 x 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. This applies in the temperature range up to 100 ° C
  • Table 1 shows the factors calculated according to equation [1] for the time delay of an aging effect due to reduced temperatures. For example, at -10 ° C compared to aging at room temperature, the aging time is extended 62 times.
  • the invention is based on the object of specifying a method for the aging-free further processing of cold strips from an age-sensitive steel with a high bake-hardening potential for the finished stove-enamelled component.
  • the aging of trained cold rolled strip is suppressed by its storage at low temperature.
  • the stove enamelling which takes place shortly after the shaping further processing prevents aging of the cold strip which has been briefly trained before further processing due to the triggered bake hardening effect.
  • Equation [3] follows from equation [2] and refers to a steel that cannot be processed properly due to nitrogen aging after a storage period of more than 2 days at 20 ° C. Due to the lower diffusion rate of carbon compared to nitrogen, aging by both elements only takes nitrogen into account.
  • Fig. 1 shows the temporal development of R eh -R el at room temperature, 60 ° C and 100 ° C.
  • 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.
  • a steel with a high content of dissolved carbon and / or nitrogen, which is not resistant to aging at room temperature, can be further processed by using one of the two methods according to the invention even after a long storage period without the risk of surface defects.
  • the advantage of the method according to the invention lies in the utilization of a high bake-hardening potential which, in comparison to conventional bake-hardening steels which are resistant to aging at room temperature, enables the components produced therefrom to have higher dent resistance.

Landscapes

  • 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)

Abstract

L'invention concerne des procédés de production d'un élément constitutif vernis au vernis à cuire et résistant au voilement, réalisé dans un feuillard laminé à froid et dressé (feuillard laminé à froid) en acier sensible au vieillissement à potentiel élevé de durcissement par étuvage, notamment de plus de 70 N/mm2. L'invention se caractérise en ce que le feuillard laminé à froid passe par dressage à l'état libre de limite d'étirage (R¿eh?-Rel < 2 N/mm?2¿), puis est stocké à une température inférieure à la température ambiante, avant de subir un traitement ultérieur pour adopter la forme de l'élément constitutif. Le feuillard est ensuite vernis 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 true EP1017863A1 (fr) 2000-07-12
EP1017863B1 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9914384A1 *

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
EP1017863B1 (fr) 2002-05-08
WO1999014384A1 (fr) 1999-03-25

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