EP0231864B1 - Bande en acier non vieillissable - Google Patents

Bande en acier non vieillissable Download PDF

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Publication number
EP0231864B1
EP0231864B1 EP87101123A EP87101123A EP0231864B1 EP 0231864 B1 EP0231864 B1 EP 0231864B1 EP 87101123 A EP87101123 A EP 87101123A EP 87101123 A EP87101123 A EP 87101123A EP 0231864 B1 EP0231864 B1 EP 0231864B1
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EP
European Patent Office
Prior art keywords
steel
cold
annealed
max
content
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
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EP87101123A
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German (de)
English (en)
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EP0231864A3 (en
EP0231864A2 (fr
Inventor
Ernst Jürgen dr. Drewes
Bernhard Dr. Engl
Klaus Dieter Horn
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.)
Hoesch Stahl AG
Original Assignee
Hoesch Stahl AG
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Publication date
Application filed by Hoesch Stahl AG filed Critical Hoesch Stahl AG
Priority to AT87101123T priority Critical patent/ATE68017T1/de
Publication of EP0231864A2 publication Critical patent/EP0231864A2/fr
Publication of EP0231864A3 publication Critical patent/EP0231864A3/de
Application granted granted Critical
Publication of EP0231864B1 publication Critical patent/EP0231864B1/fr
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    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the invention relates to the use of a cold-rolled steel strip as a material for non-aging sheets with excellent cold formability.
  • the disruptive elements C and N are stably bound by the addition of titanium or niobium.
  • a Ti-containing deep-drawing steel is known from EP-PS 120 976, which has very low carbon contents (0.004%), because with a high carbon content, the cold-rolled sheet has high yield strengths, low elongations and low r values, and accordingly that Carbon content to max. 0.015% is to be limited.
  • DE-OS 32 34 574 it is pointed out in DE-OS 32 34 574 that the amount of titanium carbide formed in the steel increases when carbon is contained in amounts above 0.015%, which leads to a considerable increase in the recrystallization temperature of the strips obtained, which is why the carbon content is limited to a maximum of 0.015%.
  • the carbon content with a titanium content of 0.15 to 0.30% must not be higher than 0.020, preferably 0.010%.
  • the sulfur content of this known deep-drawing steel must not be higher than 0.030%.
  • a steel with excellent formability can only be produced according to US Pat. No. 3,522,110 if the carbon content at Ti contents is limited from 0.02 to 0.5% to less than 0.02% C with a view to the education of good properties becomes.
  • vacuum degassing treatment must be performed to achieve this goal.
  • US Pat. No. 1,192,794 calls for a limitation of the carbon content to below 0.02% using vacuum degassing.
  • the invention has for its object to provide a steel as a material for non-aging sheets with excellent cold formability, which is nonetheless producible without increased effort.
  • a steel which is manufactured without vacuum degassing treatment, a chemical composition of up to 0.4% for complete setting of the elements nitrogen, sulfur and carbon contained in the liquid steel, Remainder iron and melting-related impurities and in the annealed, untreated state a yield strength of less than 150 N / mm2, a characteristic value of the vertical anisotropy (r m ) of more than 1.7, an elongation at break (A80) of more than 38% and an average strengthening exponent (n m ) greater than 0.22.
  • Further preferred embodiments result from the subclaims and the following exemplary embodiments.
  • the advantage of the use proposed according to the invention can be seen in particular in the fact that the steel according to the invention contains more carbon than required by the prior art and z. B. is approved for an excellent cold-formable steel, so that an expensive process step in the production of non-aging sheets with excellent cold formability, in particular the use of a vacuum treatment for carbon reduction can be dispensed with.
  • the steel contains an increased sulfur content, so that a complex desulfurization treatment can be dispensed with in the same way.
  • Steels 1 to 6 listed in the table below were melted in an oxygen blowing process and cast into slabs in the strand.
  • the slabs were heated and rolled out in a hot strip mill to form hot strip, coiled, pickled, cold-rolled and annealed in the laboratory, but not treated.
  • Steels 7 to 14 were melted, rolled, annealed and also not treated in the laboratory.
  • the steel 1 - with low C content and S content according to the prior art - has mechanical properties - measured in the tensile test - which speak for excellent cold formability, ie the yield strength ( R po.2 ) and the yield strength ratio (R po.2 / R m ) are low, while the elongation at break (A80) of the hardening exponents (n m ) and the characteristic value of the vertical anisotropy (r m ) are high.
  • Steel 2 has an increased carbon - at 0.025% with a still relatively low S content of 0.014%.
  • a Such an increased C content results in steel production using the oxygen blowing process without the use of an additional vacuum treatment.
  • the properties of the steel 2 are significantly deteriorated compared to the steel 1 - as determined in the prior art - with a tensile strength of 341 N / mm2, an elastic limit of 150 N / mm2, a yield strength ratio of 0.44, an elongation at break A80 of 34%, an average solidification exponent of 0.228 and a characteristic value of the vertical average anisotropy of 1.7.
  • the steel 3 has an S content of 0.028%, which is likewise deliberately increased, with a C content increased to 0.025%, as is obtained without the use of a vacuum treatment.
  • the mechanical properties of this non-vacuum-treated steel 3 according to the invention are, as can be seen from FIG. 1, excellent and comparable to those of the vacuum-treated steel 1.
  • the structure of the steel according to the invention consists of ferrite with a grain size of approx. 15, ⁇ m and thus resembles the structure of the steel 1 according to the prior art.
  • Steels 4 to 6 were subjected to batch annealing.
  • the behavior of these steels with regard to the mechanical properties is very similar to that of steels 1 to 3.
  • the mechanical properties of the steel 4 with the low C content required according to the current state of knowledge are excellent.
  • the steel 5 with a C content increased to 0.018% due to the saving of a vacuum treatment shows significantly deteriorated mechanical properties with a tensile strength of 330 N / mm2, an elastic limit R po.2 of 136 N / mm2 , a yield strength ratio of 0.41, an elongation at break A80 of 38%, an average strengthening exponent n m of 0.239 and a characteristic value of the vertical anisotropy r m of 1.70.
  • the steel 6 according to the invention has a C content increased to 0.023% and the specifically increased sulfur content of 0.028%.
  • FIG. 3 shows the effect of the increasing sulfur content at a different level of carbon on the mechanical properties using steels 7 to 14. From the graph it can be clearly seen that with an increase in the carbon content from 0.005 over 0.015 to 0.022% z. B. by saving a vacuum treatment, with low sulfur content, for. B. as is customary in the current state of the art below 0.02% S, the properties of the deep-drawing steel are significantly deteriorated. It is only through the targeted increase of the sulfur content according to the invention to values above 0.02% that improvements in properties can be achieved with a carbon content increased to more than 0.020%, which lead to the desired values of excellent cold formability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (6)

  1. Utilisation d'un acier à feuillard laminé à froid, fabriqué sans dégazage sous vide, présentant la composition:
    Figure imgb0005
    à 0,4 %, pour assurer une liaison chimique complète des éléments azote, soufre et carbone présents dans l'acier liquide,
    le solde étant Fer et impuretés de coulée,
    et présentant en l'état recuit et non transformé une limite élastique de moins de 150 N/mm², une caractéristique d'anisotropie transversable (rm) de plus de 1,7, un allongement à la rupture (A₈₀) de plus de 38 % et un indice moyen de consolidation (nm) de plus de 0,22, comme matière première pour tôles résistant au vieillissement et à excellente formabilité à froid.
  2. Utilisation d'un acier selon la revendication 1, avec une teneur en soufre de 0,03 à 0,05 %, pour l'application selon la revendication 1.
  3. Utilisation d'un acier selon la revendication 1, avec une teneur en soufre de (4/3 % C) à 0,05 %, pour l'application selon la revendication 1.
  4. Utilisation d'un acier selon l'une des revendications 1 à 3, un recuit de l'acier étant effectué en continu après laminage à froid.
  5. Utilisation d'un acier selon l'une des revendications 1 à 4, l'acier laminé à froid et recuit en continu étant ensuite immédiatement recouvert d'une couche métallique dans un bain de fusion.
  6. Utilisation d'un acier selon l'une des revendications 1 à 3, l'acier étant recuit après laminage à froid par le procédé de recuit en four à cloche.
EP87101123A 1986-02-06 1987-01-27 Bande en acier non vieillissable Expired - Lifetime EP0231864B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101123T ATE68017T1 (de) 1986-02-06 1987-01-27 Alterungsfreier bandstahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3603691 1986-02-06
DE19863603691 DE3603691A1 (de) 1986-02-06 1986-02-06 Alterungsfreier bandstahl

Publications (3)

Publication Number Publication Date
EP0231864A2 EP0231864A2 (fr) 1987-08-12
EP0231864A3 EP0231864A3 (en) 1989-04-26
EP0231864B1 true EP0231864B1 (fr) 1991-10-02

Family

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Family Applications (1)

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EP87101123A Expired - Lifetime EP0231864B1 (fr) 1986-02-06 1987-01-27 Bande en acier non vieillissable

Country Status (3)

Country Link
EP (1) EP0231864B1 (fr)
AT (1) ATE68017T1 (fr)
DE (2) DE3603691A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931106A (en) * 1987-09-14 1990-06-05 Kawasaki Steel Corporation Hot rolled steel sheet having high resistances against secondary-work embrittlement and brazing embrittlement and adapted for ultra-deep drawing and a method for producing the same
DE4015249A1 (de) * 1989-05-09 1991-02-28 Salzgitter Peine Stahlwerke Verfahren zur herstellung von feuerverzinktem kaltband
DE59009505D1 (de) * 1989-05-09 1995-09-14 Preussag Stahl Ag Verfahren zur herstellung von coilbreak-freiem warmband und alterungsbeständigem feuerverzinktem kaltband.
US5403410A (en) * 1990-06-06 1995-04-04 Nkk Corporation Abrasion-resistant steel
JPH0441616A (ja) * 1990-06-06 1992-02-12 Nkk Corp 低硬度で且つ耐摩耗性および曲げ加工性に優れた耐摩耗鋼の製造方法
US5236521A (en) * 1990-06-06 1993-08-17 Nkk Corporation Abrasion resistant steel
US5292384A (en) * 1992-07-17 1994-03-08 Martin Marietta Energy Systems, Inc. Cr-W-V bainitic/ferritic steel with improved strength and toughness and method of making
FR2736933B1 (fr) * 1995-07-18 1997-08-22 Lorraine Laminage Procede de fabrication d'une bande de tole mince a emboutissabilite amelioree
DE19543804B4 (de) * 1995-11-24 2004-02-05 Salzgitter Ag Verfahren zur Herstellung von feuerverzinktem Stahlband und damit hergestelltes feuerverzinktes Blech oder Band aus Stahl

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1192797A (en) * 1915-10-11 1916-07-25 Christian H Nelson Sheet-metal-edging machine.
US2495835A (en) * 1945-10-15 1950-01-31 George N Hibben Light-colored enameled steel article
US3138078A (en) * 1961-02-28 1964-06-23 Nojima Takeo Road substructure construction
US3183078A (en) * 1961-09-29 1965-05-11 Yawata Iron & Steel Co Vacuum process for producing a steel for nonageing enameling iron sheets
DE1483210A1 (de) * 1965-11-23 1969-03-20 Hoerder Huettenunion Ag Verwendung eines unlegierten Stahls mit guter Abkantbarkeit in Laengs- und Querrichtung
GB1176863A (en) * 1966-02-17 1970-01-07 Yawata Iron & Steel Co Process for the production of Cold-Rolled Steel Sheets having Excellent Press Workability
JPS523885B1 (fr) * 1966-09-10 1977-01-31
US3607456A (en) * 1969-04-15 1971-09-21 Bethlehem Steel Corp Deep drawing steel and method of manufacture
DE2052959A1 (de) * 1969-11-05 1971-05-27 Pako Corp , Minneapolis, Minn (V St A) Photographische Entwickler
US3853639A (en) * 1971-04-01 1974-12-10 Inland Steel Co Cold rolled steel strip with improved drawing properties and method for producing same
DE2133744B2 (de) * 1971-07-07 1973-07-12 August Thyssen-Hütte AG, 4100 Duisburg Die verwendung eines vollberuhigten stahles fuer gegenstaende aus warmgewalztem band
JPS5338691B2 (fr) * 1972-12-28 1978-10-17
GB1465064A (en) * 1973-08-14 1977-02-23 British Steel Corp Deep-drawing steel
JPS5722974B2 (fr) * 1975-01-28 1982-05-15
AU533226B2 (en) * 1979-03-21 1983-11-10 British Steel Corp. Non-silicon electromagnetic steel (non-aging)
JPS5867827A (ja) * 1981-09-18 1983-04-22 Nippon Steel Corp 深紋り用冷延鋼板の製造方法
JPS5967322A (ja) * 1982-10-08 1984-04-17 Kawasaki Steel Corp 深絞り用冷延鋼板の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IRON AND STEEL INTERNATIONAL, April 1982, Seiten 83-84,86; NN: "Thefuture of interstitial-free steels" *Seite 83, linke Spalte *
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 78(C-102)(956), 15 Mai 1982; &JP - A - 5713123 *

Also Published As

Publication number Publication date
EP0231864A3 (en) 1989-04-26
ATE68017T1 (de) 1991-10-15
DE3773401D1 (de) 1991-11-07
DE3603691A1 (de) 1987-08-20
EP0231864A2 (fr) 1987-08-12

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