EP0231864A2 - Bande en acier non vieillissable - Google Patents

Bande en acier non vieillissable Download PDF

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Publication number
EP0231864A2
EP0231864A2 EP87101123A EP87101123A EP0231864A2 EP 0231864 A2 EP0231864 A2 EP 0231864A2 EP 87101123 A EP87101123 A EP 87101123A EP 87101123 A EP87101123 A EP 87101123A EP 0231864 A2 EP0231864 A2 EP 0231864A2
Authority
EP
European Patent Office
Prior art keywords
steel
cold
content
annealed
carbon
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
EP87101123A
Other languages
German (de)
English (en)
Other versions
EP0231864B1 (fr
EP0231864A3 (en
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
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 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
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. 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.
  • 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 from 0.02 to 0.5% to max. 0.02% C is limited. A vacuum degassing treatment is proposed to achieve this goal. Furthermore, in US Pat. No. 1,192,794 a limitation of the carbon content of 0.02% is required 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 nonetheless without increased effort, d. H. can be produced in particular without using a vacuum degassing process.
  • a steel which has 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 into hot strip in a hot strip mill, coiled, pickled, cold-rolled and annealed in the laboratory, but not dressed.
  • 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 0.14%. Such an increased C content occurs 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, a rotation limit of 150 N / mm2, a yield ratio of 0.44, an elongation at break A80 of 34%, an average Solidification exponents of 0.228 and a characteristic value of the vertical mean. Anisotropy of 1.7.
  • 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 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% according to the invention.
  • the excellent properties are comparable to those of the vacuum-treated steel 4.
  • 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 when the carbon content is increased from 0.005 to 0.015 to 0.022%, e.g. 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 0.015%, which lead to the desired values of excellent cold formability.

Landscapes

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

Family

ID=6293541

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308751A1 (fr) * 1987-09-14 1989-03-29 Kawasaki Steel Corporation Feuille d'acier laminé à chaud ayant une résistance élevée à un accroissement de la fragilité suite à un travail secondaire ou à une soudure et adaptée à un emboutissage profond et méthode pour la fabriquer
WO1990013672A1 (fr) * 1989-05-09 1990-11-15 Stahlwerke Peine-Salzgitter Ag Procede pour fabriquer un feuillard a chaud exempt de plis de bobinage et un feuillard a froid galvanise a chaud resistant au vieillissement
DE4015249A1 (de) * 1989-05-09 1991-02-28 Salzgitter Peine Stahlwerke Verfahren zur herstellung von feuerverzinktem kaltband
GB2244718A (en) * 1990-06-06 1991-12-11 Nippon Kokan Kk An abrasion resistant steel
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
US5403410A (en) * 1990-06-06 1995-04-04 Nkk Corporation Abrasion-resistant steel
EP0754770A1 (fr) * 1995-07-18 1997-01-22 Sollac S.A. Procédé de fabrication d'une bande de tÔle mince à emboutissabilité améliorée
EP0775757A1 (fr) * 1995-11-24 1997-05-28 Preussag Stahl Ag Procédé et appareil de revêtement par immersion à chaud d'une bande d'acier avec résistance au vieilissement

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

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308751A1 (fr) * 1987-09-14 1989-03-29 Kawasaki Steel Corporation Feuille d'acier laminé à chaud ayant une résistance élevée à un accroissement de la fragilité suite à un travail secondaire ou à une soudure et adaptée à un emboutissage profond et méthode pour la fabriquer
WO1990013672A1 (fr) * 1989-05-09 1990-11-15 Stahlwerke Peine-Salzgitter Ag Procede pour fabriquer un feuillard a chaud exempt de plis de bobinage et un feuillard a froid galvanise a chaud resistant au vieillissement
DE4015249A1 (de) * 1989-05-09 1991-02-28 Salzgitter Peine Stahlwerke Verfahren zur herstellung von feuerverzinktem kaltband
GB2244718A (en) * 1990-06-06 1991-12-11 Nippon Kokan Kk An abrasion resistant steel
US5236521A (en) * 1990-06-06 1993-08-17 Nkk Corporation Abrasion resistant steel
US5403410A (en) * 1990-06-06 1995-04-04 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
EP0754770A1 (fr) * 1995-07-18 1997-01-22 Sollac S.A. Procédé de fabrication d'une bande de tÔle mince à emboutissabilité améliorée
FR2736933A1 (fr) * 1995-07-18 1997-01-24 Lorraine Laminage Procede de fabrication d'une bande de tole mince a emboutissabilite amelioree
EP0775757A1 (fr) * 1995-11-24 1997-05-28 Preussag Stahl Ag Procédé et appareil de revêtement par immersion à chaud d'une bande d'acier avec résistance au vieilissement

Also Published As

Publication number Publication date
DE3603691A1 (de) 1987-08-20
ATE68017T1 (de) 1991-10-15
DE3773401D1 (de) 1991-11-07
EP0231864B1 (fr) 1991-10-02
EP0231864A3 (en) 1989-04-26

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