EP0435968B1 - Procede pour fabriquer un feuillard a chaud exempt de plis de bobinage et un feuillard a froid galvanise a chaud resistant au vieillissement - Google Patents

Procede pour fabriquer un feuillard a chaud exempt de plis de bobinage et un feuillard a froid galvanise a chaud resistant au vieillissement Download PDF

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Publication number
EP0435968B1
EP0435968B1 EP90906870A EP90906870A EP0435968B1 EP 0435968 B1 EP0435968 B1 EP 0435968B1 EP 90906870 A EP90906870 A EP 90906870A EP 90906870 A EP90906870 A EP 90906870A EP 0435968 B1 EP0435968 B1 EP 0435968B1
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EP
European Patent Office
Prior art keywords
strip
hot
steel
titanium
coil
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Expired - Lifetime
Application number
EP90906870A
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German (de)
English (en)
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EP0435968B2 (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
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Preussag Stahl AG
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Application filed by Preussag Stahl AG filed Critical Preussag Stahl AG
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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

Definitions

  • the invention relates to a method for producing steel strip.
  • the hot strip to be unwound between the unwinding system and the infeed rollers of a processing system can run both in a large arc and in a narrow arc, depending on whether it is leading or lagging behind.
  • Coil breaks occur as serious damage to the belt surface, especially when running in a small arc and when there is a frequent change between leading and staying behind, which leads to severe blows in the belt.
  • Fast uncoiling results in particularly strong beating and correspondingly strong coil breaks.
  • 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 tape was coiled.
  • the reel temperatures were, for example, 490, 500, 450, 430, 710 and 500 ° C.
  • the mixture was cooled to room temperature and, after pickling, strips were reduced by cold rolling in various stages from 10% to 80% to sheet metal thickness and reeled.
  • the coil was heated to 700 ° C in the bell annealing furnace, annealed to a crystallization rate of 1.1 t / h to 1.9 t / h and then cooled to 120 ° C in the furnace.
  • the tape was then trained in order to avoid the appearance of flow figures (coil breaks) in the subsequent assembly into sheet metal. This material is not resistant to aging.
  • the manufacturing process according to the invention for the hot strip provides for a defined titanium content in the steel to be made more uniform, which has the following analysis values in% by weight:
  • Remainder iron and unavoidable impurities whereby the steel is cast into slabs in the continuous casting process and then finished from a slab heated from room temperature to over 1100 ° C, to 2 to 6 mm thick hot strip at temperatures above the Ars point, at temperatures from 550 to To reel at 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 steel strip with permanent yield point elongation is set so that it is stoichiometrically necessary for the setting of nitrogen but less than for the additional setting of carbon.
  • the carbon on the other hand, is only partially bound with the remaining amount of titanium; the remaining carbon is obviously kept in solution.
  • the treatment and titanium metering according to the invention can probably achieve a considerable delay in the rate of diffusion of the carbon.
  • niobium and / or vanadium as an alloying element would also have resulted in a nitrogen setting in the steel, but only if a considerable hardening of the steel strip was accepted.
  • the hot strip has a very uniform yield point elongation when there is a pronounced yield point, or in the stress-strain diagram or force-extension diagram in the region of the yield point elongation the tension has no alternating maxima and minima, that is to say one that is as smooth as possible Has course.
  • This overcomes the previous prejudice that to avoid flow figures or coil breaks it is necessary to avoid the occurrence of a pronounced yield point.
  • the hot strip according to the invention remains coilbreak-free even after prolonged cold or warm aging, has good mechanical properties and can be produced with a low consumption of alloying elements.
  • hot-dip galvanizing is understood to mean the metallic molten bath coating of steel strip with zinc and its mixtures such as Galfan and Galvalume.
  • Galfan and Galvalume are registered trademarks of ILZRO, New York.
  • the hot strip shows practically no signs of aging.
  • the subsequent treatment steps cold rolling with z. B. about 50 to 90% degree of deformation has no negative impact on the yield strength, provided that the recrystallizing annealing in the continuous furnace before the galvanizing bath provides a complete recrystallization of the structure in the steel strip.
  • the quenching of the strip directly behind the galvanizing bath initially leads to a pronounced elongation limit with alternating minima and maxima in the course of the force.
  • this band is trained to form a desired surface roughness and possibly better band flatness and, if necessary, stretch-oriented, eg. B. with 0.5 to 2% degree of deformation.
  • stretch-oriented eg. B. with 0.5 to 2% degree of deformation.
  • the force curve is again homogenized in the area of the elastic limit. The force curve remains after aging.
  • coil break-free steel strip produced according to the invention and comparison strips are shown on the basis of the hot strip samples characterized in Table 1 according to their composition (extract from the melt analysis), finish rolling temperature and reel temperature.
  • the steel strip is further processed into cold strip or assembled as hot strip or machined into cutting, stamped or bent parts after decoiling.
  • coil breaks can be done Avoid if the hot strip has been previously trained or if a special additional, and therefore costly, wrapping process was used with the help of a so-called McKay roller system, with which consciously minimal, technically ineffective coil breaks can be generated.
  • FIGS. 1 and 2 show pronounced yield point strains with a highly uneven course, both in the initial state and after aging.
  • a comparison between the hot strip samples Z and Y shows that a low reel temperature alone does not lead to an equalization of the yield point elongation.
  • the hot strips showed the same behavior with 0.04 to 0.05% by weight of Ti from the TQ melts with thicknesses of 2.09 to 4.20 mm at approximately the same final rolling temperatures of 870-880 ° C and reel temperatures of 490 to 535 ° C while samples V, U1, U2 were coiled at 450 and 430 ° C, respectively.
  • the yield strength was approx. 300 ⁇ 20 N / mm 2
  • the tensile strength approx. 390 ⁇ 15 N / mm 2 . Partial aging hardly changed the values and the strips could be processed excellently without showing coil breaks.
  • 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% (standard As sample).
  • Oil filter covers with such a flat surface were produced from this tape 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.
  • Table 4 shows an analysis extract for the steel N and the steel L according to the invention as well as comparatively for the titanium-free steels P, K and an IF steel O.
  • Table 5 shows a graphic representation of the yield strengths for the galvanized grades P, O, N before and after six months of aging and specific individual values for strips made of steels K, L before and after three months of aging.
  • Table 6 shows comparison parameters of steels L, K for freshly rolled galvanized cold strip and a condition after three months of aging.
  • Table 7 shows the temperatures in the furnace and on the strip in the course of a galvanizing process.
  • the comparative strip K which has also been outsourced, shows an increase in the yield point from 231 to 309 N / mm 2.
  • the extension is plotted on the abscissa and the force on the ordinate.
  • the force curve for a hot-dip galvanized undressed strip L is shown on the left in FIG. 8, in the middle after a skin pass degree of 0.7% and on the right after three months of aging.
  • the belt according to the invention maintains the homogeneous force curve after the skin pass, so that no disruptive flow figures become recognizable after processing.
  • FIG. 9 shows an inhomogeneous force curve in the region of the yield point for the grade K galvanized strip after three months of aging, which is permanently noticeable in the form of coil break lines on the part produced from the strip after sheet metal processing.
  • Table 6 also clearly shows that the good forming behavior (Aso-elongation) is practically retained in the steel according to the invention.
  • the elongation decreases with the band L by 1.5% points, whereas the elongation with the steel K is reduced by 6.6% points after aging.
  • the steel L according to the invention (analysis see Table 4) was melted with 0.06% titanium content in the oxygen inflation process and then cast in the strand.
  • a separated slab was heated from room temperature to 1220 ° C. and rolled to a hot strip of 4 mm thickness with a final rolling temperature (T We ) of 870 ° C. and coiled after water cooling at 520 ° C. (T Ha ).
  • the coil was rolled out with a degree of deformation of 70% to form a strip 1.2 mm thick and 1175 mm wide after it had previously been pickled.
  • the cold strip was then run at a speed of 41 m / min. corresponding to 27.3 t / h throughput, preheated to 690 ° C in a continuous annealing furnace before the galvanizing bath and annealed at 900 ° C in the annealing zone (see table 7).
  • the belt still had a temperature of 510 ° C in the trunk area before the bath inlet. At this temperature it was drawn through the galvanizing bath (460 ° C) and then quenched.
  • the strip obtained the desired surface roughness through light skin-pass treatment with a 0.7% degree of deformation.
  • the hot-dip galvanized strips treated in this way can be used for shaped parts such.

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

Claims (3)

1. Procédé de fabrication de feuillard 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:
Figure imgb0011
le reste étant du fer et des impuretés inévitables, qui est coulé en barres, une brame découpée étant réchauffée depuis sensiblement la température ambiante jusqu'à au moins 1.100°C, et ensuite laminée en feuillard à chaud à des températures situées au-dessus du point Ar3, et enfin dévidée dans une plage de température de 550 à 400 ° C.
2. Procédé selon la revendication 1, caractérisé en ce que la teneur en titane de l'acier est 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.
3. Utilisation d'un feuillard d'acier selon l'une des revendications 1 ou 2 pour la fabrication d'un feuillard galvanisé à chaud, par décapage, laminage à froid et recuit de recristallisation à des températures de four de 800 à 940 ° C et galvanisation subséquente à chaud et dressage à un taux de déformation de 0,5 à 2%.
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 true EP0435968B1 (fr) 1995-08-09
EP0435968B2 EP0435968B2 (fr) 2002-06-05

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Family Applications (1)

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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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0863222A1 (fr) * 1997-03-04 1998-09-09 Sms Schloemann-Siemag Aktiengesellschaft Procédé et dispositif pour produire de la tÔle
EP1805339A1 (fr) * 2004-09-30 2007-07-11 Posco Co., Ltd. Tole en acier laminee a froid haute resistance possedant une excellente aptitude au maintien de la forme, et procede de fabrication associe

Families Citing this family (2)

* 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
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

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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0863222A1 (fr) * 1997-03-04 1998-09-09 Sms Schloemann-Siemag Aktiengesellschaft Procédé et dispositif pour produire de la tÔle
EP1805339A1 (fr) * 2004-09-30 2007-07-11 Posco Co., Ltd. Tole en acier laminee a froid haute resistance possedant une excellente aptitude au maintien de la forme, et procede de fabrication associe
EP1805339A4 (fr) * 2004-09-30 2009-03-25 Posco Co Ltd Tole en acier laminee a froid haute resistance possedant une excellente aptitude au maintien de la forme, et procede de fabrication associe

Also Published As

Publication number Publication date
ATE126276T1 (de) 1995-08-15
EP0435968B2 (fr) 2002-06-05
DK0435968T3 (da) 1995-12-27
WO1990013672A1 (fr) 1990-11-15
EP0435968A1 (fr) 1991-07-10
DE59009505D1 (de) 1995-09-14
ES2075899T3 (es) 1995-10-16
DE4015248A1 (de) 1991-01-03
JPH04500541A (ja) 1992-01-30

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