US20110024006A1 - Steel for high-strength components made of bands, sheets or tubes having excellent formability and particular suitability for high-temperature coating processes - Google Patents

Steel for high-strength components made of bands, sheets or tubes having excellent formability and particular suitability for high-temperature coating processes Download PDF

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Publication number
US20110024006A1
US20110024006A1 US12/745,798 US74579808A US2011024006A1 US 20110024006 A1 US20110024006 A1 US 20110024006A1 US 74579808 A US74579808 A US 74579808A US 2011024006 A1 US2011024006 A1 US 2011024006A1
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United States
Prior art keywords
steel
content
component
sheets
strength
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Abandoned
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US12/745,798
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English (en)
Inventor
Joachim Schötter
Volker Flaxa
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Salzgitter Flachstahl GmbH
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Salzgitter Flachstahl GmbH
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Assigned to SALZGITTER FLACHSTAHL GMBH reassignment SALZGITTER FLACHSTAHL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FLAXA, VOLKER, SCHOETTLER, JOACHIM
Publication of US20110024006A1 publication Critical patent/US20110024006A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • 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
    • C22C38/24—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 steel for high-strength components made of bands, sheets or pipes having excellent formability and particular suitability for high-temperature coating processes according to claim 1 .
  • the term high temperature in this context indicates temperatures above A c3 (about 900° C.).
  • Components made of high-strength steels employed in the automobile industry are typically coated with corrosion-inhibiting coatings, predominantly made of zinc.
  • enamel coatings are also used in addition to corrosion-inhibiting coatings.
  • thermo-mechanical rolling Semi-finished goods, such as bands or sheets made of conventional high-strength steels for these application fields are predominantly produced by thermo-mechanical rolling. This requires that the steels are not subjected to additional heat treatment in subsequent processing steps, because the mechanical properties obtained with the thermo-mechanical treatment would otherwise be lost.
  • steels are subjected to a subsequent thermal treatment where, for example, a corrosion-inhibiting layer in form of enamel or metallic coatings made of zinc, aluminum or their alloys is applied at treatment temperatures reaching the values higher than A c3 (about 900° C.), then these steels loose their original strength. This situation occurs likewise also in similarly heat-treated zones after welding.
  • This phenomenon is repeated if multiple heat treatments are preformed, for example with thermal coating methods, with intersecting weld seams in the respective heat-treated region, as well during repeated enamel firings typically performed during enameling, causing the material to continuously loose strength.
  • Table 1 shows this phenomenon on the example of the steel grade S-420 in 3.0 mm and 8.0 mm, respectively, with a minimum yield strength of 420 MPa.
  • These steels may have another problem in that egression of hydrogen from the material is hindered by a thick protective layer, such as enamel. If this is the case, then the coating may be at risk of spalling (fish scales).
  • This reaction is accompanied by an increase in volume, wherein locally a high pressure can be generated which finally becomes so large that the yield strength of the composite enamel/steel is exceeded and half-moon-shaped enamel splinters (fish scales) occur on the enamel that has meanwhile solidified.
  • the invention is based on the invention to produce a low-cost steel for high-strength components made of bands, sheets or pipes, which has excellent formability and suitablility for high-temperature coating methods, while simultaneously ensuring general weldability and, more particularly, HFI weldability.
  • this object is obtained with a steel having the following composition in % by mass:
  • the high-strength steel according to the invention is designed as heat-treated steel which can be hardened in air or in a medium with comparable cooldown gradients.
  • the steel is particularly suited for high-temperature coating methods, for example in enameling or zinc-plating, even at treatment temperatures above 900° C., and is distinguished in that it does not lose strength during cooldown after coating, but even becomes stronger as a result of the heat treatment. It was surprising to persons skilled in the art to observe in extensive test series, that for the first time a steel could be provided with the alloy composition of the invention, which has both an excellent enameling ability and fish scale resistance, while attaining at the same time a high strength as a result of the heat treatment during enamel firing or during zinc-plating.
  • This comparatively very cost-effective alloying concept in particular the low carbon content, also produces excellent cold-forming properties in the initial state “soft”, which is of particular importance for use with deep-drawn parts, for example in sanitary installations for hot water heaters, in boiler construction, in the construction of chemical equipment or in the construction of automobile chassis.
  • the relatively low carbon equivalent furthermore ensures excellent general weldability.
  • Weldability is excellent, in particular, with high-frequency induction welding (HFI welding), as used for example in the production of pipes, because the chromium content in the weld seam, which prevents unwanted chromium carbide precipitates, is relatively small.
  • HFI welding high-frequency induction welding
  • the fish scale resistance of the steel is attained with the invention through addition of chromium and vanadium, wherein finely dispersed precipitates of chromium and vanadium carbides or carbon nitrites and titanium nitrites form hydrogen traps in the hard structure of the steel, with the atomic hydrogen formed during enameling accumulating at the hydrogen traps without damaging the enamel.
  • the alloy concept based on Mn, Cr, Mo, V and B enables temper-hardening of the steel already with a cooldown gradient that is comparable to cooldown in air through an advantageous shift in the relevant transformation points.
  • the steel has a low Si-content of ⁇ 0.30% for zinc-plating, thereby ensuring suitability for zinc-plating, for example, for applications in the automotive industry.
  • temper-hardened steels where hardening is attained solely by cooldown of the steel in air, for example after heat treatment of the component, in order to realize the required material properties.
  • cold-formability can be attained by way of a subsequent soft-annealing process, for example in a hood-type annealing furnace, or by homogenizing annealing.
  • the cold-formability after hot-rolling can also be maintained by slowly cooling a suitably tightly wound coil, optionally in a special insulated hood.
  • the temper-hardening conditions can then again be adjusted by way of a subsequent heat treatment.
  • cold-forming refers to the following process variants:
  • Table 2 lists parameters measured on samples of the steel according to the invention for hot-rolled and cold-rolled sheets or bands, as well as pipes produced therefrom:
  • test results show that the comparison steel TRIP HXT800 has a pickling removal which is significantly higher than the allowed value, so that fish scale resistance could not be tested.
  • FIGS. 1 a to 1 c The results of the fish scale test are illustrated in FIGS. 1 a to 1 c.
  • FIGS. 2 and 3 Reference is made here to FIGS. 2 and 3 .
  • the steel according to the invention can be used in many applications in form of a band, sheet, hot- or cold-rolled, or for welded and seamless pipes.
  • the thickness range or wall-thickness range may be, for example, 0.5-4 mm.
  • the corresponding values for hot-rolled or hot-formed products are about 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)
US12/745,798 2007-12-03 2008-11-05 Steel for high-strength components made of bands, sheets or tubes having excellent formability and particular suitability for high-temperature coating processes Abandoned US20110024006A1 (en)

Applications Claiming Priority (3)

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
DE102007058222.8 2007-12-03
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 (1)

Publication Number Publication Date
US20110024006A1 true US20110024006A1 (en) 2011-02-03

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US12/745,798 Abandoned US20110024006A1 (en) 2007-12-03 2008-11-05 Steel for high-strength components made of bands, sheets or tubes having excellent formability and particular suitability for high-temperature coating processes

Country Status (8)

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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10036085B2 (en) 2012-03-23 2018-07-31 Salzgitter Flachstahl Gmbh Non-scaling heat-treatable steel and method for producing a non-scaling component from said steel
US10086426B2 (en) 2009-08-21 2018-10-02 Salzgitter Flachstahl Gmbh Method for producing a hot strip by means of strip casting with material properties adjustable across the strip cross-section
US10273552B2 (en) 2012-01-30 2019-04-30 Salzgitter Flachstahl Gmbh Ultrahigh-strength multiphase steel with improved properties during production and processing
CN110121568A (zh) * 2016-12-27 2019-08-13 杰富意钢铁株式会社 高强度镀锌钢板及其制造方法
US10626478B2 (en) 2014-11-18 2020-04-21 Salzgitter Flachstahl Gmbh Ultra high-strength air-hardening multiphase steel having excellent processing properties, and method for manufacturing a strip of said steel
US10640855B2 (en) 2014-11-18 2020-05-05 Salzgitter Flachstahl Gmbh High-strength air-hardening multiphase steel having excellent processing properties, and method for manufacturing a strip of said steel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118491A1 (de) 2010-11-26 2012-05-31 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Bauteilen durch Warmumformung von Platinen
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
DE102016104295A1 (de) 2016-03-09 2017-09-14 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Stahl zur Verwendung als Schweißzusatzwerkstoff
DE102017218434A1 (de) * 2017-10-16 2019-04-18 Thyssenkrupp Ag Emaillieren von höherfesten Stählen
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

Citations (2)

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US20040166360A1 (en) * 2001-10-23 2004-08-26 Kazuhito Imai Hot press forming method, and a plated steel material therefor and its manufacturing method
US20070029015A1 (en) * 2003-09-30 2007-02-08 Naoki Yoshinaga High-yield-ratio high-strength thin steel sheet and high-yield-ratio high-strength hot-dip galvanized thin steel sheet excelling in weldability and ductility as well as high-yield ratio high-strength alloyed hot-dip galvanized thin steel sheet and process for producing the same

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EP1143022B1 (de) * 1999-09-16 2010-04-14 JFE Steel Corporation Verfahren zur herstellung einer dünnen stahlplatte mit hoher festigkeit
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US20040166360A1 (en) * 2001-10-23 2004-08-26 Kazuhito Imai Hot press forming method, and a plated steel material therefor and its manufacturing method
US20070029015A1 (en) * 2003-09-30 2007-02-08 Naoki Yoshinaga High-yield-ratio high-strength thin steel sheet and high-yield-ratio high-strength hot-dip galvanized thin steel sheet excelling in weldability and ductility as well as high-yield ratio high-strength alloyed hot-dip galvanized thin steel sheet and process for producing the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10086426B2 (en) 2009-08-21 2018-10-02 Salzgitter Flachstahl Gmbh Method for producing a hot strip by means of strip casting with material properties adjustable across the strip cross-section
US10273552B2 (en) 2012-01-30 2019-04-30 Salzgitter Flachstahl Gmbh Ultrahigh-strength multiphase steel with improved properties during production and processing
US10036085B2 (en) 2012-03-23 2018-07-31 Salzgitter Flachstahl Gmbh Non-scaling heat-treatable steel and method for producing a non-scaling component from said steel
US10626478B2 (en) 2014-11-18 2020-04-21 Salzgitter Flachstahl Gmbh Ultra high-strength air-hardening multiphase steel having excellent processing properties, and method for manufacturing a strip of said steel
US10640855B2 (en) 2014-11-18 2020-05-05 Salzgitter Flachstahl Gmbh High-strength air-hardening multiphase steel having excellent processing properties, and method for manufacturing a strip of said steel
CN110121568A (zh) * 2016-12-27 2019-08-13 杰富意钢铁株式会社 高强度镀锌钢板及其制造方法
US11377708B2 (en) 2016-12-27 2022-07-05 Jfe Steel Corporation High-strength galvanized steel sheet and method for producing the same

Also Published As

Publication number Publication date
RU2010127341A (ru) 2012-01-10
KR20100097669A (ko) 2010-09-03
ATE515583T1 (de) 2011-07-15
RU2472868C2 (ru) 2013-01-20
EP2227574A1 (de) 2010-09-15
WO2009071046A1 (de) 2009-06-11
DE102007058222A1 (de) 2009-06-04
PL2227574T3 (pl) 2011-12-30
EP2227574B1 (de) 2011-07-06

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Owner name: SALZGITTER FLACHSTAHL GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHOETTLER, JOACHIM;FLAXA, VOLKER;REEL/FRAME:024847/0359

Effective date: 20100531

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION