EP0435968B2 - Procede pour fabriquer des pieces formees a partir d'un feuillard a chaud exempt de plis de bobinage - Google Patents

Procede pour fabriquer des pieces formees a partir d'un feuillard a chaud exempt de plis de bobinage Download PDF

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Publication number
EP0435968B2
EP0435968B2 EP90906870A EP90906870A EP0435968B2 EP 0435968 B2 EP0435968 B2 EP 0435968B2 EP 90906870 A EP90906870 A EP 90906870A EP 90906870 A EP90906870 A EP 90906870A EP 0435968 B2 EP0435968 B2 EP 0435968B2
Authority
EP
European Patent Office
Prior art keywords
steel
hot strip
strip
hot
coil
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
EP90906870A
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German (de)
English (en)
Other versions
EP0435968B1 (fr
EP0435968A1 (fr
Inventor
Klaus Freier
Klaus-Dieter Hufenbach
Stefan Hussy
Walter Zimnik
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.)
Salzgitter AG
Original Assignee
Salzgitter 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.)
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Publication date
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Application filed by Salzgitter AG filed Critical Salzgitter AG
Publication of EP0435968A1 publication Critical patent/EP0435968A1/fr
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Classifications

    • 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

Definitions

  • the invention relates to a method for producing formed parts from a hot strip.
  • the hot strip to be unwound can work without braking or without sufficient tension between the unwinding system and the introduction rolls of a processing system both in a large arc and also run in a tight arc, depending on whether it is leading or lagging behind. Especially when it comes to small bow and with frequent changes between leading and lagging, which is too strong Beats in the strip, coil breaks occur as serious damage to the strip surface. Fast uncoiling has a particularly strong hitting and accordingly strong coil breaks Episode.
  • Coil breaks between the straightening rolls can also occur. Due to the sinusoidal continuous bending of the band, the tension in the different band sections is distributed unevenly, so that flow can start at different loads. Coil breaks can no longer be eliminated by subsequent straightening, bending, pickling or skin-dressing. The tendency towards coil breaks increases the softer, thinner and narrower the hot strip to be unwound. The same applies to smaller coil diameters.
  • the object of the invention is therefore to provide a method for producing soft coilbreak-free Steel strip with permanent yield point elongation and good mechanical properties to indicate the lowest possible consumption of alloying elements.
  • the manufacturing method according to the invention for the formed parts from hot strip provides for a defined titanium content in the steel to be made more uniform, which has the following analytical values in% by weight: C 0.02 - 0.08% Si 0.01 - 0.40% Mn 0.05-1.00% P 0.002 - 0.025% S 0.001 - 0.015% al 0.015-0.080% N ⁇ 0.0080% Ti > 0.04 - 0.080%
  • Remainder iron and unavoidable impurities whereby the steel is cast into slabs using the continuous casting process and then finished from a slab heated from room temperature to over 1100 ° C. to a hot strip of 2 to 6 mm thickness at temperatures above the Ar 3 point, at temperatures of 550 to reel up to 400 ° C.
  • the hot strip has an almost constant yield strength of less than 350 N / mm 2 in the freshly rolled state and after prolonged aging.
  • the titanium content of the steel for the production of coilbreak-free hot strip with a longer-term Elongation at stretch is set according to the invention so that it is larger than for setting Nitrogen, but less than is stoichiometrically necessary for the additional setting of carbon.
  • Hot strip remains coilbreak-free even after prolonged cold or warm aging, has good mechanical properties and can be produced with low consumption of alloying elements.
  • Examples of the coil break-free hot strip produced according to the invention and comparison strips are based on the composition in Table 1 (extract from the melt analysis), final rolling temperature and coil temperature characterized hot strip samples.
  • the steel strip is cooled in the coil in still air in relatively fresh rolling Condition assembled as hot strip or for cutting, punching or Bent parts machined after decoiling.
  • coil breaks can be done Avoid if the hot strip has been previously treated or if a special additional, and therefore expensive, Wrapping process with the help of a so-called McKay roll system, with the deliberately minimal, technically ineffective coil breaks can be used.
  • the uniformity of the yield point elongation occurs in all examined sample layers.
  • Table 2 in all sample layers with a steel with 0.033% by weight carbon, 0.20% by weight manganese and 0.04% by weight titanium and a reel temperature of 450 ° C., the yield strength and tensile strength values according to the method according to the invention achieved that correspond to those of the known soft, non-microalloyed grades according to US standard SAE 1006/1008.
  • this material is characterized by high elongation values of around 45% (A 5 standard sample).
  • Oil filter lids were produced from this tape and had such a flat surface that they did not need to be reworked.
  • formed parts can advantageously be produced from the coilbreak-free hot strip, the surface of which has to meet increased requirements.
  • Hot strip / melt sample Location R eH N / mm 2 R m N / mm 2 FIG.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Steel (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Claims (1)

  1. Procédé de fabrication des pièces formées de feuillard à chaud d'acier ne souffrant pas de rupture des bobines, d'une épaisseur de 2 à 6 mm, présentant une limite d'allongement inférieure à 350 N/mm2, avec une limite d'allongement constante dans le temps, sans minima et maxima alternés, réalisé à partir d'acier présentant la composition suivante en pourcentages en poids: C 0,02 - 0,08 % Si 0,01 - 0,40 % Mn 0,05 - 1,00 % P 0,002 - 0,025 % S 0,001 - 0,015 % Al 0,015 - 0,080 % N ≤ 0,0080 % Ti >0,04 - 0,080 %
    le reste étant du fer et des impuretés inévitables, qui est coulé en barres, une brame découpée étant réchauffée depuis sensiblement la températures ambiante jusqu'à au moins 1.100 °C, et ensuite laminée en feuillard à chaud à des températures situées au-dessus du point Ar3, enfin dévidée dans une plage de température de 550 à 400 °C, et après debobinage redressée à la machine pour donner des pièces de découpe, d'estampage ou de cintrage, la teneur en titane de l'acier étant établie à au moins la quantité nécessaire pour lier l'azote, et à une valeur moindre que celle stoechiométriquement nécessaire pour la liaison complète supplémentaire du carbone.
EP90906870A 1989-05-09 1990-05-09 Procede pour fabriquer des pieces formees a partir d'un feuillard a chaud exempt de plis de bobinage Expired - Lifetime EP0435968B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3915445 1989-05-09
DE3915445 1989-05-09
PCT/DE1990/000338 WO1990013672A1 (fr) 1989-05-09 1990-05-09 Procede pour fabriquer un feuillard a chaud exempt de plis de bobinage et un feuillard a froid galvanise a chaud resistant au vieillissement

Publications (3)

Publication Number Publication Date
EP0435968A1 EP0435968A1 (fr) 1991-07-10
EP0435968B1 EP0435968B1 (fr) 1995-08-09
EP0435968B2 true EP0435968B2 (fr) 2002-06-05

Family

ID=6380474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90906870A Expired - Lifetime EP0435968B2 (fr) 1989-05-09 1990-05-09 Procede pour fabriquer des pieces formees a partir d'un feuillard a chaud exempt de plis de bobinage

Country Status (7)

Country Link
EP (1) EP0435968B2 (fr)
JP (1) JPH04500541A (fr)
AT (1) ATE126276T1 (fr)
DE (2) DE59009505D1 (fr)
DK (1) DK0435968T3 (fr)
ES (1) ES2075899T3 (fr)
WO (1) WO1990013672A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2675891C1 (ru) * 2018-05-22 2018-12-25 Публичное акционерное общество "Северсталь" Способ производства горячекатаных листов из низколегированной стали класса прочности К60 толщиной до 40 мм

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE19708666A1 (de) * 1997-03-04 1998-09-10 Schloemann Siemag Ag Verfahen und Anlage zum Herstellen von Metallband
KR20060028909A (ko) * 2004-09-30 2006-04-04 주식회사 포스코 형상 동결성이 우수한 고강도 냉연강판 및 그 제조방법

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5241209B1 (fr) * 1970-12-19 1977-10-17
US3947293A (en) * 1972-01-31 1976-03-30 Nippon Steel Corporation Method for producing high-strength cold rolled steel sheet
JPS5669358A (en) * 1979-10-18 1981-06-10 Kobe Steel Ltd Ultra low carbon cold rolled steel sheet with superior press formability
DE3603691A1 (de) * 1986-02-06 1987-08-20 Hoesch Stahl Ag Alterungsfreier bandstahl
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
DE3803064C2 (de) * 1988-01-29 1995-04-20 Preussag Stahl Ag Kaltgewalztes Blech oder Band und Verfahren zu seiner Herstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2675891C1 (ru) * 2018-05-22 2018-12-25 Публичное акционерное общество "Северсталь" Способ производства горячекатаных листов из низколегированной стали класса прочности К60 толщиной до 40 мм

Also Published As

Publication number Publication date
ATE126276T1 (de) 1995-08-15
EP0435968B1 (fr) 1995-08-09
DE4015248A1 (de) 1991-01-03
DE59009505D1 (de) 1995-09-14
JPH04500541A (ja) 1992-01-30
DK0435968T3 (da) 1995-12-27
WO1990013672A1 (fr) 1990-11-15
EP0435968A1 (fr) 1991-07-10
ES2075899T3 (es) 1995-10-16

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