EP0699769A1 - 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
EP0699769A1
EP0699769A1 EP95401091A EP95401091A EP0699769A1 EP 0699769 A1 EP0699769 A1 EP 0699769A1 EP 95401091 A EP95401091 A EP 95401091A EP 95401091 A EP95401091 A EP 95401091A EP 0699769 A1 EP0699769 A1 EP 0699769A1
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EP
European Patent Office
Prior art keywords
steel
ppm
nitrogen
under vacuum
stamped
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
EP95401091A
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English (en)
French (fr)
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EP0699769B1 (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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Publication date
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Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0699769A1 publication Critical patent/EP0699769A1/de
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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 producing a steel for packaging suitable for deep drawing and little sensitive to the formation of horns during stamping, and a steel obtained from this process.
  • the present invention is particularly applicable to the production of very thin products obtained by deep drawing of the stamped-re-stamped boxes or stamped-ironed boxes type.
  • a sheet blank is stamped, generally made of a metal which has undergone a rolling operation, 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 irregularity is located at the end of the peripheral skirt and this irregularity creates a certain number of obstacles during subsequent operations.
  • This anisotropy of the metal with regard to its resistance to thinning is also responsible for the formation of folds or ripples in certain areas during stamping.
  • This anisotropy of the metal is translated by two coefficients, well known in the technique of stamping, in particular of swaged stamping, the Lankford coefficient r and the coefficient of planar anisotropy ⁇ r.
  • the Lankford coefficient r is representative of the resistance to thinning of the metal used in the direction in lacquer! The it is determined.
  • the direction in which the Lankford coefficient is highest 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 Lankford coefficient is the lowest corresponds to the direction in which the metal has a high resistance to sliding and therefore forms folds during drawing and therefore to the direction of the hollow of the horn.
  • This planar anisotropy coefficient ⁇ r is representative of the ability of the sheet blank to present horns and horn recesses when stamped.
  • Such steels have a carbon content of the order of 200 to 800 ppm (parts per million) and exhibit, after having undergone a roll-hardening operation, known as a skin pass operation, with a skin pass reduction rate of of the order of 25%, relatively high mechanical characteristics (Rm of the order of 620 MPa).
  • planar anisotropy coefficient ⁇ r after the skin pass operation with a reduction rate of around 25% is in the range of 0.15 to 0.20.
  • re-rolling with 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 low carbon steel degassed under vacuum with low nitrogen content goes from 0.16 for a rate 25% reduction in skin pass to 0.28 for a skin pass reduction rate of around 35%.
  • the subject of the present invention is a process for the preparation of a steel for packaging allowing, at the same reduction rate as the skin pass, to obtain mechanical characteristics substantially equal to those of mild steel which is not degassed under vacuum and properties stamping 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 little 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 after degassing under vacuum, nitrogen is blown into the steel bath to add to said steel 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 produced by the above process, characterized in that after its preparation, it is hot rolled and / or cold rolled, it undergoes continuous or base annealing, and it undergoes hardening by light rolling.
  • the present invention also relates to the use of a steel as described above for the production of very thin products obtained by deep drawing of the stamped-re-stamped boxes or stamped-ironed boxes.
  • the present invention relates to a steel for packaging suitable for deep drawing and not very sensitive to the formation of horns during stamping, particularly useful for the production of very thin products obtained by deep drawing, in particular by shrinking stamping, of the box type. stamped-stamped or stamped-ironed boxes.
  • This steel is a low carbon steel produced in a known manner, using a steelworks converter, then degassed under vacuum in a decarburization chamber.
  • the added nitrogen content must be greater than 80 ppm, since a lower content would not be sufficiently effective and the mechanical characteristics of the steel would not be increased significantly enough.
  • the added nitrogen content must also be less than 140 ppm, because if more than 140 ppm of nitrogen is added, the steel becomes too effervescent and very difficult or almost impossible to flow.
  • the steel after its production according to the process described above is then cast, hot rolled and / or cold rolled, it undergoes continuous annealing or annealing on base, and it undergoes hardening by light rolling in a finishing train. , also called skin pass operation.
  • a first series of blanks was produced from mild steel of standard type with 800 ppm carbon, cold rolled, annealed and having undergone a skin pass operation with a reduction rate of 25%.
  • This steel was also cold rolled, annealed and subjected to a skin pass operation with a reduction rate of 25%, under conditions identical to the first series of blanks.
  • This steel was then subjected to the same rolling, annealing and skin pass treatment as 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)
  • Vacuum Packaging (AREA)
  • Packages (AREA)
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
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
FR9410361 1994-08-29

Publications (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8012276B2 (en) 2004-06-18 2011-09-06 Nippon Steel Corporation Method for manufacturing a steel sheet for tin plated steel sheet and tin-free steel sheet each having excellent formability

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014112286A1 (de) * 2014-08-27 2016-03-03 Thyssenkrupp Ag Verfahren zur Herstellung eines aufgestickten Verpackungsstahls

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1120668A (en) * 1965-07-09 1968-07-24 Maximilianshuette Eisenwerk Method of producing low-carbon steel sheet
GB1182144A (en) * 1966-02-26 1970-02-25 Hoerder Huettenunion Ag Method of producing a Drawing and Deep Drawing Steel Resistant to Ageing, particularly for Single-Coat Enamelling
FR2078273A5 (en) * 1970-02-06 1971-11-05 Armco Steel Corp Low carbon, iron-contng enamel
FR2083682A1 (en) * 1970-03-31 1971-12-17 Nippon Steel Corp Steel sheet for deep drawn cans
EP0521808A1 (de) * 1991-07-04 1993-01-07 Sollac Verfahren zum Herstellen von Tiefziehblechen

Family Cites Families (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
EP0659890B1 (de) * 1993-12-21 2000-03-29 Kawasaki Steel Corporation Verfahren zum Herstellen von dünnen Stahlblechen mit niedriger planarer Anisotropie für Dosen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1120668A (en) * 1965-07-09 1968-07-24 Maximilianshuette Eisenwerk Method of producing low-carbon steel sheet
GB1182144A (en) * 1966-02-26 1970-02-25 Hoerder Huettenunion Ag Method of producing a Drawing and Deep Drawing Steel Resistant to Ageing, particularly for Single-Coat Enamelling
FR2078273A5 (en) * 1970-02-06 1971-11-05 Armco Steel Corp Low carbon, iron-contng enamel
FR2083682A1 (en) * 1970-03-31 1971-12-17 Nippon Steel Corp Steel sheet for deep drawn cans
EP0521808A1 (de) * 1991-07-04 1993-01-07 Sollac Verfahren zum Herstellen von Tiefziehblechen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8012276B2 (en) 2004-06-18 2011-09-06 Nippon Steel Corporation Method for manufacturing a steel sheet for tin plated steel sheet and tin-free steel sheet each having excellent formability

Also Published As

Publication number Publication date
DE69513347D1 (de) 1999-12-23
FR2723964B1 (fr) 1997-03-14
ATE186753T1 (de) 1999-12-15
ES2141311T3 (es) 2000-03-16
DE69513347T2 (de) 2000-07-27
FR2723964A1 (fr) 1996-03-01
EP0699769B1 (de) 1999-11-17

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