EP0581629B1 - Stahlblech für Abstrecktiefziehen - Google Patents

Stahlblech für Abstrecktiefziehen Download PDF

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Publication number
EP0581629B1
EP0581629B1 EP93401739A EP93401739A EP0581629B1 EP 0581629 B1 EP0581629 B1 EP 0581629B1 EP 93401739 A EP93401739 A EP 93401739A EP 93401739 A EP93401739 A EP 93401739A EP 0581629 B1 EP0581629 B1 EP 0581629B1
Authority
EP
European Patent Office
Prior art keywords
sheet
rolling
temperature
cold
coefficient
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
EP93401739A
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English (en)
French (fr)
Other versions
EP0581629A1 (de
Inventor
Daniel Lafontaine
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
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0581629A1 publication Critical patent/EP0581629A1/de
Application granted granted Critical
Publication of EP0581629B1 publication Critical patent/EP0581629B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

Definitions

  • the present invention relates to sheet metal aluminum calmed steel for swaged stamping.
  • Such sheets must have characteristics mechanical giving them good drawability, that is to say an aptitude to undergo a stamping without necking or breaking.
  • Mechanical characteristics of a sheet vary according to the composition of the steel constituting the sheet and according to the sheet manufacturing conditions.
  • sheets cold-rolled i.e. obtained by re-rolling cold of hot-rolled sheets from of a slab.
  • the average anisotropy coefficient r m (r 0 + r 90 + 2r 45 ) 4
  • the curves representing the evolution of the average anisotropy coefficient r m and of the plane anisotropy coefficient ⁇ r as a function of the cold re-rolling rate are established, which makes it possible to determine the ability to deep-drawn stamping with little appearance of horns, and to compare these curves with those of other sheets possibly usable for deep-drawn stamping.
  • the object of the present invention is to provide a sheet metal with suitable composition and manufacture to be able to be used in a less limited way in deep-drawn stamping, with low level of horns stamping.
  • Curve A in Figures 1 and 2 is representative of a sheet made of boron steel, the temperature end of hot rolling being about 885 ° i.e. above the point temperature apparent transformation, the winding temperature being 640 °.
  • the average anisotropy coefficient r m is between 0.9 and 1.1 while the plane anisotropy coefficient ⁇ r is in absolute value generally less than 0, 3.
  • Curve B in Figures 1 and 2 is representative a steel sheet called "standard” that is to say low carbon and hot rolled, the end temperature of hot rolling being 885 °, that is to say greater than apparent transformation point and the temperature of winding being approximately 565 °.
  • Such a sheet has good drawability but the disadvantage of presenting after stamping important horns when the rate of re-rolling at cold is between 35 and 85%.
  • curve C corresponds to a sheet having after stamping horns less important than standard steel sheet in an important area of cold rolling rate (between 30 and 70% approximately).
  • the invention allows, in particular, in the field of cold sheets, to obtain a metal known as "without drawing horns "( ⁇ r ⁇ 0.3) for re-rolling rates higher than in the case of a standard sheet (up to around 45% compared to 35%).
  • Curve C is the result of successive tests and represents a preferred sheet according to the invention. These tests made it possible to determine that for a sheet according to the invention, steel calmed with aluminum contains carbon in a proportion of 0.02 to 0.05% by weight and manganese in a proportion of 0.1 to 0.3 %, the hot rolling temperature being less than the apparent transformation point temperature and the winding temperature being between 200 and 500 ° C.
  • the steel contains carbon in a proportion of 0.02 to 0.05% by weight, of the manganese in a proportion of 0.1 to 0.3%, aluminum in a proportion of 0.03 to 0.07% and nitrogen in a proportion of 0.003 to 0.006%.
  • the hot rolling temperature is important because if it is rolled at a temperature greater than or equal to the transformation temperature Ar 3 , the curves representative of the sheet will be similar to curves B, that is to say that the sheet will have a coefficient d plane anisotropy ⁇ r more important.
  • the hot rolling temperature is lower than the temperature recommended by the invention, the ability to stamp the sheet will be less good, in particular, the curve representing the coefficient mean anisotropy will approach curve A.
  • An example of a preferred sheet, represented by the curve C, consists of a sheet made of steel, the weight composition is preferably as follows: 0.03% carbon, 0.2% manganese, 0.05% aluminum, 0.005% nitrogen, the rest being iron.
  • the preferred end of rolling temperature at hot is about 30 ° C below the temperature of the apparent transformation point.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Claims (1)

  1. Al-beruhigtes Stahlblech, welches einen mittleren Anisotropiekoeffizienten rm von höher als 1,2 und einem Flächenanisotropiekoeffizienten Δr von weniger als 0,30 aufweist, und welches in Gewichtsprozent die folgende gewichtsanalytische Zusammensetzung aufweist:
    0,02 bis 0,05% Kohlenstoff
    0,1 bis 0,3% Mangan
    0,03 bis 0,07% Aluminium
    0,003 bis 0,006% Stickstoff,
    wobei der Rest aus Eisen und restlichen Unreinheiten besteht, wobei das Blech durch Heißwalzen einer Bramme, dann durch Wicklung, Kaltwalzen des erhaltenen Heißwalzbandes und ein Ausglühen unter einer Glocke des kaltgewalzten Bandes erhalten wird, wobei die Endtemperatur des Heißwalzens zwischen dem Scheinumwandlungspunkt Ar3 und Ar3 -30°C und der Wickeltemperatur zwischen ca. 200 und 500°C liegt.
EP93401739A 1992-07-23 1993-07-05 Stahlblech für Abstrecktiefziehen Expired - Lifetime EP0581629B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9209107 1992-07-23
FR9209107A FR2694024B1 (fr) 1992-07-23 1992-07-23 Tôle améliorée pour emboutissage en rétreint et procédé de fabrication d'une telle tôle.

Publications (2)

Publication Number Publication Date
EP0581629A1 EP0581629A1 (de) 1994-02-02
EP0581629B1 true EP0581629B1 (de) 1999-05-19

Family

ID=9432191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401739A Expired - Lifetime EP0581629B1 (de) 1992-07-23 1993-07-05 Stahlblech für Abstrecktiefziehen

Country Status (5)

Country Link
EP (1) EP0581629B1 (de)
AT (1) ATE180286T1 (de)
DE (1) DE69324968T2 (de)
ES (1) ES2134248T3 (de)
FR (1) FR2694024B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2728490B1 (fr) * 1994-12-21 1997-01-24 Lorraine Laminage Procede de fabrication d'une bande d'acier destinee a la fabrication par emboutissage et re-emboutissage de recipients en acier
FR2738259B1 (fr) * 1995-09-06 1997-10-03 Lorraine Laminage Procede de fabrication d'une bande en acier pour emballage

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1304915A (fr) * 1961-10-25 1962-09-28 Armco Steel Corp Procédé de fabrication de tôles ou feuillards en acier à basse teneur en carbone
US3357822A (en) * 1964-06-26 1967-12-12 Sumitomo Metal Ind Low-carbon aluminum killed steel for high temperature applications
JPS501341B1 (de) * 1969-12-30 1975-01-17
JPS5322052B2 (de) * 1971-12-27 1978-07-06
JPS5338691B2 (de) * 1972-12-28 1978-10-17
US4313770A (en) * 1979-06-28 1982-02-02 Sumitomo Metal Industries, Ltd. Method of producing cold rolled steel strip having improved press formability and bake-hardenability
JPS6342355A (ja) * 1986-08-06 1988-02-23 Nippon Steel Corp 片面ホ−ロ−用熱延鋼板およびその製造方法
JPH0293025A (ja) * 1988-09-28 1990-04-03 Nippon Steel Corp 連続焼鈍による耐時効性の優れた冷延鋼板の製造方法

Also Published As

Publication number Publication date
ES2134248T3 (es) 1999-10-01
DE69324968T2 (de) 1999-09-16
ATE180286T1 (de) 1999-06-15
EP0581629A1 (de) 1994-02-02
DE69324968D1 (de) 1999-06-24
FR2694024B1 (fr) 1994-10-14
FR2694024A1 (fr) 1994-01-28

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