EP2227574B1 - Stahl für hochfeste bauteile aus bändern, blechen oder rohren mit ausgezeichneter umformbarkeit und besonderer eignung für hochtemperatur-beschichtungsverfahren - Google Patents

Stahl für hochfeste bauteile aus bändern, blechen oder rohren mit ausgezeichneter umformbarkeit und besonderer eignung für hochtemperatur-beschichtungsverfahren Download PDF

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Publication number
EP2227574B1
EP2227574B1 EP08855857A EP08855857A EP2227574B1 EP 2227574 B1 EP2227574 B1 EP 2227574B1 EP 08855857 A EP08855857 A EP 08855857A EP 08855857 A EP08855857 A EP 08855857A EP 2227574 B1 EP2227574 B1 EP 2227574B1
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EP
European Patent Office
Prior art keywords
steel
strength
sheets
content
bands
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Application number
EP08855857A
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German (de)
English (en)
French (fr)
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EP2227574A1 (de
Inventor
Joachim SCHÖTTLER
Volker Flaxa
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Salzgitter Flachstahl GmbH
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Salzgitter Flachstahl GmbH
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Priority to PL08855857T priority Critical patent/PL2227574T3/pl
Publication of EP2227574A1 publication Critical patent/EP2227574A1/de
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    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a steel for high-strength components made of strips, sheets or tubes with excellent formability and particular suitability for high-temperature coating method according to claim 1.
  • high temperature in this context temperatures above A c3 (about 900 ° C) understood.
  • thermomechanical rolling This presupposes that these steels are no longer subjected to heat treatment in downstream process stages, since in this case the mechanical properties would be lost from the thermomechanical treatment.
  • Table 1 below shows this with the example of steel grade S-420 in 3.0 mm and 8.0 mm with a minimum yield strength of 420 MPa.
  • Table 1 Change in the mechanical properties of sheets from S-420 after 1 or 2 enamel firings Thickness, mm sample Location Status R p0.2 - MPa R m - MPa A 80 % 3.0 mm along initial state 444 569 21.3 after 1 annealing 430 521 25.1 after 2 anneals 405 522 25.9 crosswise initial state 502 592 20.9 after 1 annealing 453 537 25.1 after 2 anneals 439 537 23.0 8.0 mm along initial state 426 523 29.8 after 1 annealing 391 498 31.0 after 2 anneals 385 494 31.5 crosswise initial state 437 538 26.7 after 1 annealing 401 505 29.7 after 2 anneals 395 503 29.2
  • the cause of the occurrence of fish scales is considered to be that during the enamelling process, the steel surface comes into contact with moisture from the furnace atmosphere and from the enamel slurry.
  • the reaction of the water with the steel surface forms atomic hydrogen, which diffuses into the steel during the baking process.
  • the hydrogen solubility in the steel decreases, and the hydrogen urges out of the steel and recombines at the material boundary steel / enamel to form molecular hydrogen.
  • This reaction is associated with an increase in volume, which can build up a high pressure locally, which eventually becomes so great that the adhesive strength of the composite enamel / steel is exceeded and crescent-shaped enamel flaking (fish scales) occur in the now solidified enamel.
  • the invention has for its object to provide a low-cost steel for high-strength components of tapes, sheets or tubes, which has excellent formability and suitability for high temperature coating process while ensuring the general weldability and in particular the HFI weldability.
  • this object is achieved by a steel with the following contents in% by mass: C 0.07 to ⁇ 0.15 al ⁇ 0.05 Si ⁇ 0.80 Mn 1.60 to ⁇ 2.10 P ⁇ 0.020 S ⁇ 0.010 Cr 0.50 to ⁇ 1.0 Not a word 0.15 to ⁇ 0.25 Ti min 48/14 x [N] V 0.05 to ⁇ 0.10 B 0.0015 to ⁇ 0.0050 Rest of iron including standard steel-accompanying elements ,
  • the high-strength steel according to the invention is designed as a tempering steel which can be hardened in air or in a medium having comparable cooling gradients.
  • the steel is suitable for high-temperature coating processes such.
  • enamelling or galvanizing even at treatment temperatures above 900 ° C particularly suitable and is characterized by the fact that it does not lose strength when cooled after coating, but even gains strength by the tempering effect.
  • a steel is provided with the alloy composition according to the invention, which has both an excellent enameling and fish scale resistance and at the same time obtains a high strength from the tempering treatment during enamel firing or galvanizing.
  • the relatively low carbon equivalent also ensures excellent overall weldability.
  • HFI welding high-frequency induction welding
  • the Fischuppenbe pretechnik the steel is inventively achieved by an addition of chromium and vanadium, with finely dispersed precipitates of chromium and vanadium carbides or carbonitrides and titanium nitrides in the hardened structure of the steel form hydrogen traps on which the forming during enamelling atomic hydrogen harmless for can attach the enamel.
  • the alloy concept based on Mn, Cr, Mo, V and B causes the compensation of the steel already at a cooling gradient comparable to cooling in air by advantageous displacement of the relevant transformation points.
  • the steel has a low for a galvanizing with ⁇ 0.30% Si content, so that the galvanic z. B. is guaranteed for use in the automotive industry.
  • the cold workability can be achieved by a subsequent soft annealing, z. B. in a hood annealing, or by a Homogenticiansglühen be achieved.
  • the cold workability may alternatively according to Hot rolls are also preserved when a correspondingly tightly wound coil slowly, u. U. in a special thermally insulated hood, cools.
  • the tempering state can then be readjusted by means of a subsequent heat treatment.
  • Table 2 determined characteristic values are listed on samples of the steel according to the invention for hot or cold rolled sheets or strips and tubes produced therefrom: Table 2: Change in the mechanical characteristics of the steel according to the invention after enameling Cold strip 1.5 mm R p0.2 [MPa] R m [MPa] As [%] Delivery condition soft 339 494 35.1 After enameling 490 770 12.1 Hot strip 4.6 mm R p0.2 [MPa] R m [MPa] As [%] Delivery condition soft 336 528 33.4 After enameling 475 740 12.2
  • test results show that the comparison steel TRIP HXT800 has a pickling removal that is significantly higher than the specifications, so that a fish scale resistance test was not possible.
  • the steel according to the invention can be used in a wide range of variations as strip, sheet metal, hot or cold rolled or for welded and seamless pipes.
  • the thickness or wall thickness range z. B. 0.5 - 4 mm.
  • the corresponding values for hot-rolled or hot-formed products are approx. 1.5 - 8 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)
EP08855857A 2007-12-03 2008-11-05 Stahl für hochfeste bauteile aus bändern, blechen oder rohren mit ausgezeichneter umformbarkeit und besonderer eignung für hochtemperatur-beschichtungsverfahren Active EP2227574B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08855857T PL2227574T3 (pl) 2007-12-03 2008-11-05 Stal dla elementów konstrukcyjnych o wysokiej wytrzymałości z taśm, blach lub rur o doskonałej formowalności i szczególnej przydatności do procesów powlekania wysokotemperaturowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007058222A DE102007058222A1 (de) 2007-12-03 2007-12-03 Stahl für hochfeste Bauteile aus Bändern, Blechen oder Rohren mit ausgezeichneter Umformbarkeit und besonderer Eignung für Hochtemperatur-Beschichtungsverfahren
PCT/DE2008/001845 WO2009071046A1 (de) 2007-12-03 2008-11-05 Stahl für hochfeste bauteile aus bändern, blechen oder rohren mit ausgezeichneter umformbarkeit und besonderer eignung für hochtemperatur-beschichtungsverfahren

Publications (2)

Publication Number Publication Date
EP2227574A1 EP2227574A1 (de) 2010-09-15
EP2227574B1 true EP2227574B1 (de) 2011-07-06

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EP08855857A Active EP2227574B1 (de) 2007-12-03 2008-11-05 Stahl für hochfeste bauteile aus bändern, blechen oder rohren mit ausgezeichneter umformbarkeit und besonderer eignung für hochtemperatur-beschichtungsverfahren

Country Status (8)

Country Link
US (1) US20110024006A1 (pl)
EP (1) EP2227574B1 (pl)
KR (1) KR20100097669A (pl)
AT (1) ATE515583T1 (pl)
DE (1) DE102007058222A1 (pl)
PL (1) PL2227574T3 (pl)
RU (1) RU2472868C2 (pl)
WO (1) WO2009071046A1 (pl)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014017274A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Höchstfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102014017273A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102014017275A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102017218434A1 (de) 2017-10-16 2019-04-18 Thyssenkrupp Ag Emaillieren von höherfesten Stählen

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009038974B3 (de) 2009-08-21 2010-11-25 Salzgitter Flachstahl Gmbh Verfahren zum Erzeugen von Warmband mittels Bandgießen mit über den Bandquerschnitt einstellbaren Werkstoffeigenschaften
DE102011118491A1 (de) 2010-11-26 2012-05-31 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Bauteilen durch Warmumformung von Platinen
DE102012002079B4 (de) 2012-01-30 2015-05-13 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höchstfesten Mehrphasenstahl
DE102013004905A1 (de) 2012-03-23 2013-09-26 Salzgitter Flachstahl Gmbh Zunderarmer Vergütungsstahl und Verfahren zur Herstellung eines zunderarmen Bauteils aus diesem Stahl
DE102016104295A1 (de) 2016-03-09 2017-09-14 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Stahl zur Verwendung als Schweißzusatzwerkstoff
EP3564400B1 (en) * 2016-12-27 2021-03-24 JFE Steel Corporation High-strength galvanized steel sheet and method for manufacturing same
DE102019114090A1 (de) 2019-05-27 2020-12-03 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines geschweißten Bauteils aus einem umgeformten hochfesten Stahl und Bauteil hierzu
DE102024102000A1 (de) 2024-01-24 2025-07-24 Voestalpine Stahl Gmbh Emaillierfähiges stahlblech und verfahren zur herstellung eines solchen

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014017274A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Höchstfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102014017273A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102014017275A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
WO2016078643A1 (de) 2014-11-18 2016-05-26 Salzgitter Flachstahl Gmbh Hochfester lufthärtender mehrphasenstahl mit hervorragenden verarbeitungseigenschaften und verfahren zur herstellung eines bandes aus diesem stahl
WO2016078644A1 (de) 2014-11-18 2016-05-26 Salzgitter Flachstahl Gmbh Höchstfester lufthärtender mehrphasenstahl mit hervorragenden verarbeitungseigenschaften und verfahren zur herstellung eines bandes aus diesem stahl
WO2016078642A1 (de) 2014-11-18 2016-05-26 Salzgitter Flachstahl Gmbh Hochfester lufthärtender mehrphasenstahl mit hervorragenden verarbeitungseigenschaften und verfahren zur herstellung eines bandes aus diesem stahl
DE102017218434A1 (de) 2017-10-16 2019-04-18 Thyssenkrupp Ag Emaillieren von höherfesten Stählen

Also Published As

Publication number Publication date
PL2227574T3 (pl) 2011-12-30
RU2010127341A (ru) 2012-01-10
ATE515583T1 (de) 2011-07-15
KR20100097669A (ko) 2010-09-03
US20110024006A1 (en) 2011-02-03
DE102007058222A1 (de) 2009-06-04
WO2009071046A1 (de) 2009-06-11
RU2472868C2 (ru) 2013-01-20
EP2227574A1 (de) 2010-09-15

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