EP1017863A1 - Verfahren zur erzeugung von einbrennlackierten bauteilen aus alterungsempfindlichem stahl - Google Patents
Verfahren zur erzeugung von einbrennlackierten bauteilen aus alterungsempfindlichem stahlInfo
- 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
Links
- 230000032683 aging Effects 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000470 constituent Substances 0.000 title abstract 3
- 210000003298 dental enamel Anatomy 0.000 title abstract 3
- 238000003860 storage Methods 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 229910052757 nitrogen Inorganic materials 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 230000003679 aging effect Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 230000002431 foraging effect Effects 0.000 description 2
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
Description
Claims
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 (de) | 1997-09-12 | 1998-08-04 | Verfahren zur erzeugung von einbrennlackierten bauteilen aus alterungsempfindlichem stahl |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1017863A1 true EP1017863A1 (de) | 2000-07-12 |
EP1017863B1 EP1017863B1 (de) | 2002-05-08 |
Family
ID=7842158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98943833A Expired - Lifetime EP1017863B1 (de) | 1997-09-12 | 1998-08-04 | Verfahren zur erzeugung von einbrennlackierten bauteilen aus alterungsempfindlichem stahl |
Country Status (7)
Country | Link |
---|---|
US (1) | US6726786B1 (de) |
EP (1) | EP1017863B1 (de) |
JP (1) | JP2001516807A (de) |
AT (1) | ATE217356T1 (de) |
DE (1) | DE19740148C1 (de) |
ES (1) | ES2177049T3 (de) |
WO (1) | WO1999014384A1 (de) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1051307A (de) | ||||
US3537913A (en) | 1967-04-17 | 1970-11-03 | Nat Steel Corp | Cyclic stressing for suppression of strain aging |
JPS5215046B2 (de) * | 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 |
-
1997
- 1997-09-12 DE DE19740148A patent/DE19740148C1/de not_active Expired - Fee Related
-
1998
- 1998-08-04 JP JP2000511921A patent/JP2001516807A/ja active Pending
- 1998-08-04 US US09/508,490 patent/US6726786B1/en not_active Expired - Fee Related
- 1998-08-04 AT AT98943833T patent/ATE217356T1/de not_active IP Right Cessation
- 1998-08-04 WO PCT/EP1998/004845 patent/WO1999014384A1/de active IP Right Grant
- 1998-08-04 ES ES98943833T patent/ES2177049T3/es not_active Expired - Lifetime
- 1998-08-04 EP EP98943833A patent/EP1017863B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
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 (de) | 2002-05-08 |
WO1999014384A1 (de) | 1999-03-25 |
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