EP0699769B1 - Verfahren zur Herstellung eines tiefziehfähigen Verpackungsstahlen und nach diesem Verfahren hergestellter Stahl - Google Patents

Verfahren zur Herstellung eines tiefziehfähigen Verpackungsstahlen und nach diesem Verfahren hergestellter Stahl Download PDF

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Publication number
EP0699769B1
EP0699769B1 EP95401091A EP95401091A EP0699769B1 EP 0699769 B1 EP0699769 B1 EP 0699769B1 EP 95401091 A EP95401091 A EP 95401091A EP 95401091 A EP95401091 A EP 95401091A EP 0699769 B1 EP0699769 B1 EP 0699769B1
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EP
European Patent Office
Prior art keywords
steel
nitrogen
ppm
deep
drawn
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.)
Revoked
Application number
EP95401091A
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English (en)
French (fr)
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EP0699769A1 (de
Inventor
Véronique Sardoy
Patrick Zimmer
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the subject of the present invention is a method for preparing a steel for packaging suitable for deep drawing and not very sensitive to formation of horns during stamping, and a steel obtained from this process.
  • the present invention is particularly applicable to the production very thin products obtained by deep drawing of the box type stamped-stamped or stamped-ironed boxes.
  • a sheet blank When manufacturing a metal package, a sheet blank, generally made of a metal which has undergone an operation of rolling, so that this metal has an anisotropy with regard to its resistance to thinning.
  • this collar has a sinuous profile comprising "horns" and “hollow horns”.
  • This anisotropy of the metal with regard to its resistance to thinning is also responsible for the formation of folds or undulations in certain areas during stamping.
  • This formation of folds or ripples is due to a difference resistance to sliding of the metal according to the areas under the blank holder which surrounds the die and the stamping punch.
  • This anisotropy of the metal is translated by two coefficients, well known in the art of stamping, in particular of deep-drawn stamping, the Lankford coefficient r and the coefficient planar anisotropy ⁇ r.
  • the Lankford coefficient r is representative of the resistance to thinning of the metal used in the direction in which it is determined.
  • the direction in which the Lankford coefficient is most high corresponds to the direction in which the metal flows easily and therefore does not form folds during stamping and therefore at the position of the horns.
  • the direction in which the coefficient of Lankford is the lowest corresponds to the direction in which the metal has a high resistance to sliding and therefore forms folds during stamping and therefore to the direction of the hollow of the horn.
  • This planar anisotropy coefficient ⁇ r is representative of the ability of the sheet metal blank to present horns and horn recesses to stamping.
  • Such steels have a carbon content of the order of 200 to 800 ppm (parts per million) and present, after having undergone an operation work hardening by rolling, called skin pass operation, with a rate of 25% reduction in skin pass, mechanical characteristics relatively high (Rm of the order of 620 MPa).
  • planar anisotropy coefficient ⁇ r after the skin pass operation with a reduction rate of around 25% is around 0.15 to 0.20.
  • the re-rolling on the skin pass has the effect of degrading certain properties such as for example the elongation percent after rupture and the planar anisotropy coefficient ⁇ r.
  • planar anisotropy coefficient ⁇ r of an ultra steel low carbon degassed under vacuum with low nitrogen content goes from 0.16 for a skin pass reduction rate of around 25% to 0.28 for a rate 35% reduction in skin pass.
  • the subject of the present invention is a method for preparing a steel for packaging allowing the same skin pass reduction rate, obtain mechanical characteristics substantially equal to those of a mild steel not degassed under vacuum and deep drawing properties substantially identical to that of an ultra-low carbon steel degassed under vacuum with low nitrogen content.
  • the present invention relates more particularly to a method of producing a steel for packaging suitable for deep drawing and not very sensitive to the formation of horns during drawing, in which a low carbon steel is produced by vacuum degassing in a decarburization chamber, characterized in that the composition of the steel degassed under vacuum, before insufflation of the nitrogen is as follows in ppm: Carbon ⁇ 80 Manganese from 1000 to 3000 Aluminum ⁇ 400 Nitrogen ⁇ 40 Phosphorus ⁇ 150 Sulfur ⁇ 150 Silicon ⁇ 200 Molybdenum ⁇ 80 Copper + Nickel + Chrome ⁇ 800 the remainder being iron and residuals, and in that, after degassing under vacuum, nitrogen is blown into the steel bath to add to said steel from 80 to 140 ppm of nitrogen.
  • the present invention also relates to a steel for packaging suitable for deep drawing and not very sensitive to the formation of horns during stamping developed by the above process which, after its preparation, is hot rolled and / or cold rolled, undergoes continuous or base annealing, and undergoes rolling hardening light, so as to have a planar anisotropy coefficient ⁇ r ⁇ 0.20.
  • the present invention also relates to the use of a steel such as described above for the production of very thin products obtained by deep drawing of stamped-re-stamped boxes or boxes stamped-ironed.
  • the present invention relates to a steel for packaging suitable for deep drawing and little sensitive to the formation of horns during deep drawing, particularly useful for the production of very thin obtained by deep drawing, in particular by deep drawing in shrinkage, of the stamped-re-stamped boxes or stamped-ironed boxes.
  • This steel is a low carbon steel produced from known manner, to the steelworks converter, then degassed under vacuum in a decarburization enclosure.
  • the important characteristic of this steel is that, after vacuum degassing, nitrogen is blown into the steel bath to add said steel from 80 to 140 ppm (parts per million) of nitrogen.
  • the added nitrogen content must be greater than 80 ppm, because a lower content would not be effective enough and we would not significantly increase the characteristics steel mechanics.
  • the added nitrogen content must also be less than 140 ppm, because if you add more than 140 ppm nitrogen, the steel becomes too effervescent and very difficult or almost impossible to pour.
  • the steel undergoes vacuum degassing until reaching a carbon content of 80 ppm or less, preferably at 40 ppm, and the steel is an extra mild steel, calmed with aluminum, free of titanium and niobium.
  • the steel after its production according to the process described above is then cast, hot rolled and / or cold rolled, it is annealed continuous or annealing on base, and it undergoes a hardening by light rolling on a finishing train. also called skin pass operation.
  • the Applicant has found that the addition of nitrogen after vacuum degassing does not degrade the drawing properties of steel, and in particular does not influence the planar anisotropy coefficient ⁇ r.
  • a first series of blanks was made of mild steel type standard at 800 ppm carbon, cold rolled, annealed and subjected to skin pass operation with a 25% reduction rate.
  • a second series of blanks was produced from mild steel with very low carbon calmed with aluminum, without titanium or niobium, the composition of which is as follows in ppm: Carbon 50 Manganese 2000 Aluminum 300 Nitrogen 30 Phosphorus 120 Sulfur 130 Silicon 150 Molybdenum 60 Copper + Nickel + Chrome 600 the rest being iron and residuals.
  • This steel was also cold rolled, annealed and subjected to skin pass operation with a 25% reduction rate, in conditions identical to the first series of blanks.
  • This steel was then subjected to the same rolling treatment, annealed. and skin pass than the other two.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Packages (AREA)
  • Vacuum Packaging (AREA)

Claims (4)

  1. Verfahren zur Herstellung eines tiefziehfähigen Verpackungsstahles, der wenig anfällig für die Ausbildung von Zipfeln während des Ziehvorgangs ist, wobei ein Stahl mit geringem Kohlenstoffgehalt durch Entgasung im Vakuum in einer Entkohlungskammer hergestellt wird, dadurch gekennzeichnet, dass der im Vakuum entgaste Stahl vor dem Einblasen von Stickstoff die folgende Zusammensetzung in ppm aufweist: Kohlenstoff ≤ 80, vorzugsweise ≤ 40 Mangan von 1000 bis 3000 Aluminium ≤ 400 Stickstoff ≤ 40 Phosphor ≤ 150 Schwefel ≤ 150 Silizium ≤ 200 Molybdän ≤ 80 Kupfer+Nickel+Chrom ≤ 800
    Rest Eisen und Verunreinigungen,
    und dass nach dem Entgasen im Vakuum Stickstoff in das Stahlbad eingeblasen wird, um dem Stahl 80 bis 140 ppm Stickstoff zuzufügen.
  2. Verfahren zur Herstellung eines Verpackungsstahles nach Anspruch 1, dadurch gekennzeichnet, dass der Stahl ein extraweicher Stahl ist, der mit Aluminium beruhigt wurde und der weder Titan noch Niob enthält.
  3. Tiefziehfähiger Verpackungsstahl, der nur wenig anfällig für die Ausbildung von Zipfeln während des Ziehvorgangs ist und der nach dem Verfahren gemäß der vorgehenden Ansprüche hergestellt worden ist und der nach seiner Herstellung warm gewalzt und/oder kaltgewalzt und einer kontinuierlichen oder zeitweisen Wiedererwärmung ausgesetzt wird und der einem leichten Kaltnachwalzvorgang unterworfen wird, derart, dass er einen planaren Anisotropie-Koeffizienten
    Δr < 0,20 aufweist.
  4. Verwendung eines Stahles nach Anspruch 3 für die Herstellung mittels eines Tiefziehverfahrens von sehr dünnen Gegenständen vom Typ gezogene-nachgezogene Dose oder gezogene-repassierte Dose.
EP95401091A 1994-08-29 1995-05-11 Verfahren zur Herstellung eines tiefziehfähigen Verpackungsstahlen und nach diesem Verfahren hergestellter Stahl Revoked EP0699769B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9410361 1994-08-29
FR9410361A FR2723964B1 (fr) 1994-08-29 1994-08-29 Procede d'elaboration d'un acier pour emballage apte a un emboutissage profond et acier obtenu par ce procede

Publications (2)

Publication Number Publication Date
EP0699769A1 EP0699769A1 (de) 1996-03-06
EP0699769B1 true EP0699769B1 (de) 1999-11-17

Family

ID=9466529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401091A Revoked EP0699769B1 (de) 1994-08-29 1995-05-11 Verfahren zur Herstellung eines tiefziehfähigen Verpackungsstahlen und nach diesem Verfahren hergestellter Stahl

Country Status (5)

Country Link
EP (1) EP0699769B1 (de)
AT (1) ATE186753T1 (de)
DE (1) DE69513347T2 (de)
ES (1) ES2141311T3 (de)
FR (1) FR2723964B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4559918B2 (ja) 2004-06-18 2010-10-13 新日本製鐵株式会社 加工性に優れたブリキおよびテインフリースチール用鋼板およびその製造方法
DE102014112286A1 (de) 2014-08-27 2016-03-03 Thyssenkrupp Ag Verfahren zur Herstellung eines aufgestickten Verpackungsstahls

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6428319A (en) * 1987-07-24 1989-01-30 Nippon Kokan Kk Production of nitrogen-containing steel
EP0659890A2 (de) * 1993-12-21 1995-06-28 Kawasaki Steel Corporation Verfahren zum Herstellen von dünnen Stahlblechern mit niedriger planarer Anisotropie für Dosen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417463A (en) * 1965-07-09 1968-12-24 Maximilianshuette Eisenwerk Method of producing steel for sheets to be enamelled by the single-coat method
LU53027A1 (de) * 1966-02-26 1968-03-25
AU2433671A (en) * 1970-02-06 1972-07-20 Armco Steel Corporation Product and method for making drawing quality enameling stock
DE2115307B2 (de) * 1970-03-31 1976-08-05 Nippon Steel Corp., Tokio Verwendung eines stahls
FR2678641B1 (fr) * 1991-07-04 1998-11-20 Lorraine Laminage Acier a emboutissabilite amelioree et procede de fabrication de toles destinees a l'emboutissage.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6428319A (en) * 1987-07-24 1989-01-30 Nippon Kokan Kk Production of nitrogen-containing steel
EP0659890A2 (de) * 1993-12-21 1995-06-28 Kawasaki Steel Corporation Verfahren zum Herstellen von dünnen Stahlblechern mit niedriger planarer Anisotropie für Dosen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 211 (C - 597) 17 May 1989 (1989-05-17) *

Also Published As

Publication number Publication date
ES2141311T3 (es) 2000-03-16
DE69513347T2 (de) 2000-07-27
ATE186753T1 (de) 1999-12-15
FR2723964B1 (fr) 1997-03-14
FR2723964A1 (fr) 1996-03-01
DE69513347D1 (de) 1999-12-23
EP0699769A1 (de) 1996-03-06

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