US20140147697A1 - Apparatus for producing annealed steels and process for producing said steels - Google Patents

Apparatus for producing annealed steels and process for producing said steels Download PDF

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Publication number
US20140147697A1
US20140147697A1 US14/232,474 US201214232474A US2014147697A1 US 20140147697 A1 US20140147697 A1 US 20140147697A1 US 201214232474 A US201214232474 A US 201214232474A US 2014147697 A1 US2014147697 A1 US 2014147697A1
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Prior art keywords
temperature
cooling
zone
strip
heating
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US14/232,474
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Inventor
Basjan Berkhout
David Neal Hanlon
Steven Celotto
Gerardus Jacobus Paulussen
Jacques Pierre Jean Verberne
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Tata Steel Nederland Technology BV
Tata Steel Ijmuiden BV
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Tata Steel Nederland Technology BV
Tata Steel Ijmuiden BV
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Assigned to TATA STEEL NEDERLAND TECHNOLOGY BV, TATA STEEL IJMUIDEN BV reassignment TATA STEEL NEDERLAND TECHNOLOGY BV ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERKHOUT, BASJAN, CELOTTO, STEVEN, HANLON, DAVID NEAL, PAULUSSEN, GERARDUS JACOBUS, VERBERNE, JACQUES PIERRE JEAN
Publication of US20140147697A1 publication Critical patent/US20140147697A1/en
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D21/00—Combined processes according to methods covered by groups B21D1/00 - B21D19/00
    • 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
    • C21D8/0447—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 characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C21D8/0478—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 involving a particular surface treatment
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]

Definitions

  • This invention related to an apparatus for producing annealed steels and to a process for producing said steels.
  • alloy design is the most powerful tool available to product developers the limitations imposed by customer specifications and in-house makability requirements (e.g. weldability, galvanisability, surface condition, mill loads etc) present a serious obstacle to further improvement of existing products through alloying alone.
  • these same limitations imposed on chemistry when taken together with the relatively restricted variation in annealing schedule which may be achieved over conventional high volume lines, represent hard obstacles to commercialisation of the most promising metallurgical strategies for the next generation of ultra high strength, high ductility steels.
  • current high strength steel developments are reaching the acceptable limits of alloy addition and the next generation of advanced high strength steel may not be achievable without resorting to alloy contents which are unacceptably high in the context of current processing practice and capabilities.
  • HSS hot-dip galvanising
  • HDG hot-dip galvanising
  • AHSS Advanced HSS
  • AHSS are multiphase steels which contain phases like martensite, bainite and retained austenite in quantities sufficient to produce unique mechanical properties.
  • AHSS exhibit higher strength values or a superior combination of high strength with good formability (Bleck & Phiu-on, HSLA Steels 2005, Sanya (China)).
  • EP0688884-A1 discloses such a large scale production facility for annealing and hot dip galvanising a metal strip incorporating an induction furnace which allows producing an initial temperature peak at the beginning of the thermal cycle to accelerate the recrystallisation using a heating zone consisting of an induction heating to the peak temperature and a soaking zone (Z 2 ) second with a cooling zone (Z 1 ) in between.
  • an apparatus for producing annealed steels comprising:
  • the apparatus according to the invention allows the development and production of (relatively) low-volume, high-value products instead of low-value, high-volume products.
  • the highly flexible continuous annealing and galvanising line is extremely useful because it allows the production of AHSS and UHSS steels with simpler chemistries and gives the opportunity to run small batch sizes against relatively low (running) costs.
  • the apparatus according to the invention allows the production of AHSS and UHSS steels with a flexibility of the heat treatments and thus in different properties over the length of the strip.
  • a constraint of conventional production lines for the continuous processing of strip is that the heating and cooling is applied uniformly over the whole width of the strip.
  • One reason for this is to achieve uniformity in mechanical properties.
  • different mechanical properties are required at different locations in the product for its manufacture (e.g. formability as in bendability) or for its application (e.g. high strength for energy absorption).
  • Different mechanical properties can be achieved through different heat-treatment cycles or post heat treatment after the main annealing cycle. Therefore, it would also be advantageous to incorporate not just flexibility in the temperature/time profiles of a production line, but also allow the option of spatial flexibility in heat treating the strip with multiple heat treatment zones parallel to the longitudinal direction of the strip.
  • the differences in heat treatment may be differences in overageing or tempering temperatures after a main annealing cycle that may include a deep quench.
  • the apparatus according to the invention allows the production of AHSS and UHSS steels with a spatial flexibility of the heat treatments and thus in different properties over the width of the strip.
  • the latter local heat treatment in a tailor annealing zone produces Tailor Annealed Strip (TAS).
  • TAS Tailor Annealed Strip
  • the apparatus according to the invention provides the following new processing capabilities:
  • UHSS substrates in many cases require full-austenitisation (high top temperatures) followed by rapid cooling to a low quench temperature and subsequent isothermal holding often at a temperature substantially higher than the quench temperature.
  • the unique features of the apparatus are the capability to apply an almost endless variety of annealing curves and the possibility to switch quickly between production of different products. Both properties are enabled by the use of special technology that allows flexibility in heating and cooling sections of the furnace and a low heat latency of the furnace as a whole. The furnace is therefore the most important part of the line.
  • the heating zone of the line comprises a heating step, a soaking step and a cooling step.
  • This heating step comprises a first heating section that will heat the product to an intermediate temperature.
  • This first heating section is followed by a second heating section that is able to heat the material to a temperature of around 1000° C. or a lower temperature depending on the requirements.
  • the intermediate temperature is preferably between 400 and 600° C., and more preferably between 450 and 550° C.
  • a suitable intermediate temperature is about 500° C.
  • the first heating section preferably consists of a Radiant Tube Furnace (RTF).
  • RTF Radiant Tube Furnace
  • an induction furnace could be used, but the RTF generally provide a more uniform temperature profile over the width at these relatively low temperatures.
  • the second section preferably comprises one or more, but preferably at least two induction heating sections in order to give the line its heating flexibility.
  • Most steel grades benefit from initial fast heating in the temperature range between 500 and 750-800° C. Preferably this is enabled by a fast transverse flux (TFX) induction furnace following base temperature heating up to 500° C. in the first heating part.
  • the top temperature between 850 and 1000° C. can be obtained by a second TFX induction furnace. Because of the paramagnetic properties of some of the materials (austenitic steels) transversal induction is needed.
  • the second TFX induction furnace is used for final heating from 800° C. to about 1000° C. All ferrous materials become paramagnetic in this temperature range, so transversal induction is needed.
  • RTF cannot be used to heat to the top temperature because of the large thermal latency in the cycle temperatures as a result of extensive heat accumulation in the RTF equipment itself and the slower overall heating rate achievable with RTF. This would adversely affect the flexibility of the apparatus in terms of rapid switches between annealing cycles.
  • the heating step is followed by a soaking step that is relevant for a number of materials. It can soak materials at a given temperature for periods depending on the line speed.
  • the preferable maximum soaking time is about 120 seconds, more preferably 60 seconds.
  • the material After soaking, the material will be cooled in the cooling step, preferably by three subsequent cooling sections: a slow cooling section, followed by a fast cooling section and finally a third cooling section that will be active when materials need to be cooled to temperatures around 100° C. before entering the reheating zone.
  • the cooling part which follows after the soaking part, comprises one or more cooling sections to achieve the cooling of the strip after soaking.
  • this cooling part comprises a slow cooling section, a fast cooling section and a third cooling section.
  • the slow cooling section is used to cool the strip from the soaking temperature to the fast cooling start temperature, which is usually just above the temperature where the austenite would start to transform (Ar3).
  • the fast cooling section the strip is cooled from the temperature just above Ar3 to a temperature of about 300° C.
  • the third cooling section would further cool the strip to a temperature below the temperature where no further transformation takes place, i.e. about 100° C.
  • the fast and third cooling section may be separate sections, or one integrated section with the ability of controlling the cooling stop temperature and the cooling rate.
  • the cooling rate in the fast cooling is preferably at least 50° C./s.
  • the strip In the reheating zone the strip may be subjected to an overageing step or an annealing step.
  • an overageing step or an annealing step In order to reach the overageing temperature in a fast and flexible manner, another induction furnace is installed.
  • the reheating zone of the furnace can be used as an overageing section or optionally, it can be used to apply a uniform or local heat treatment.
  • the latter local heat treatment produces Tailor Annealed Strip (TAS).
  • TAS material mechanical properties can be tailored according to the specific requirements of the part. At locations where more formability is needed this can be achieved by local heat treatment of the strip in the line, usually resulting in desired variations of the mechanical properties over the width of the strip.
  • the products this TAS-option will enable are coils of strip of coated or uncoated HSS with one or more zones parallel to the rolling direction. These zones are preferably at least 50 mm wide.
  • the properties of the TAS-treated zones will be dependent on the applied temperature cycle but will in general result in an enhanced (local) formability which can facilitate the use of HSS/UHSS for complex part geometries.
  • the strip After the overaging, the uniform annealing, or the TAS treatment, the strip will be cooled to about between 150 and 250° C. in a fourth cooling section before leaving the protective atmosphere. Finally the strip will be cooled with air to about 50 to 100° C. in a fifth cooling section.
  • the fourth cooling section cools the strip to about between 150 and 250° C., preferably about 200° C., preferably using HNx and/or the fifth cooling section cools the strip to about 50 to 100° C., preferably about 80° C., preferably by using air cooling.
  • the reheating to an overageing temperature of preferably between 350 and 450° C. preferably takes place by means of a longitudinal flux induction (LFX) because of the flexibility it provides.
  • LFX longitudinal flux induction
  • the relevant steels are all magnetic at the overageing temperatures there is no need to use a TFX-furnace, although it could be used instead of an LFX.
  • a TFX-unit is needed as the temperatures involved of preferably between 750 and 850° C. involve paramagnetic materials.
  • the overageing time depends on the line speed and the length of the furnace, but it is generally preferably limited to 180s.
  • the galvanisation is performed by electrolytic coating in an electrolytic coating part.
  • Electro-galvanising was chosen instead of hot dip galvanising. This was done in order to be able to make the annealing process completely independent of the galvanising process and to be able to achieve an excellent coating quality even at lines speeds which are low in comparison to conventional HDG lines.
  • An activation/pickling and/or cleaning section is preferably used just before the an electrolytic coating part. This reduces surface related problems to a minimum and allows the use of a larger variety of alloying elements.
  • annealing and coating steps are separated such that coating requirements (such as line speed and strip temperature) can be met without consequence for the development of the substrate microstructure or imposition of severe alloying restrictions. Beside these advantages there is the obvious advantage that current high capacity lines to produce large volumes of consistent commodities are relieved of the production of these difficult niche-products.
  • the invention is also embodied in a process using the apparatus according to the invention.
  • the invention is also embodied in the annealed steel produced using the apparatus or the process according to the invention.
  • FIG. 1 a schematic drawing of an apparatus in accordance with the invention is presented in FIG. 1 .
  • the entry zone may e.g. comprise one or more of rinsing equipment, drying equipment, buffer means (such as looping tower).
  • the exit zone may e.g. comprise one or more of surface inspection, oiling equipment, cutting equipment or buffer means.
  • FIG. 1 By means of non-limiting examples the flexibility of the apparatus according to FIG. 1 is demonstrated by means of FIGS. 2 to 6 wherein in FIG. 2 the thermal curve for a 600 MPa AHSS is presented comprising ferrite, bainite, martensite and retained austenite.
  • FIG. 3 shows the curve for a recovery annealed steel
  • FIG. 4 for a steel comprising bainitic ferrite and martensite
  • FIG. 5 for a tempered martensite.
  • FIG. 2 A fast heating rate in the temperature range 500-750° C. is employed because fast heating through into the heating transformation range is beneficial since it influences the size and distribution of the intercritical austenite and thus, in turn, of the second phase in the final microstructure.
  • the material is heated to ⁇ 750° C.
  • the strip goes through the 2nd fast heating to the soaking section at an intercritical temperature typically in the range 780-850° C. for.
  • the strip is first slowly cooled and then fast cooled to an overageing temperature of ⁇ 420° C. This temperature is chosen to promote the formation of bainite leading to the enrichment of carbon in austenite and thus the retention of metastable austenite in the final microstructure. Martensite is formed in the final cool followed by cooling to ambient temperature. An interruption of the final quench at 200° C. or lower is permissible.
  • FIG. 3 Heat treatment of 10-60 s at 600-700° C. where the heating and cooling rates are not critical to induce recovery in a cold-rolled high strength steel to allow for an increased elongation at the expense of some of the work-hardening.
  • FIG. 4 After the RTF furnace, the material is heated to ⁇ 750° C., and after the 2nd fast heating the strip will have a temperature>Ac3. After full austenitizing during the soak at ⁇ 850° C. for ⁇ 30 seconds, the strip is slowly cooled but the temperature should remain above 700° C. at the end of the slow cool section. The fast cooling will decrease the strip temperature to ⁇ 400° C. In the overageing section the austenite decomposes virtually completely to bainitic ferrite such that no martensite will be formed in the final cooling.
  • FIG. 5 First the material must be fully austenitic at temperature dependent on the C and Mn content, but typically above 820° C., followed by relatively fast cooling of at least 80° C./s to below a temperature of at least 200° C. to fully transform into martensite.
  • Light tempering to improve bendability and hole-expansion can be achieved by re-heating up to about 400-500° C. for 10-60s.
  • Higher temperature or longer tempering to improve formability at some expense to strength is achieved by heat treating at 600-750° C. for 30-60s. Heating and cooling rates for tempering are not critical.
  • FIG. 6 The strip is heated and austenitized in the intercritical region meaning that the soaking temperature is in the range 830-860° C.
  • the volume fraction of intercritical ferrite is controlled by this top temperature, which in its turn determines the hardenability of the austenite prior to cooling.
  • the strip is cooled slowly to ⁇ 700° C., and subsequently the strip goes through the fast cooling section to arrive at temperature near Ms ( ⁇ 350° C.).
  • the 3rd cooling section is important to cool the strip to ⁇ 250° C. A moderate cooling rate is sufficient in this section because the formation of martensite in this temperature range is not time dependent but simply controlled by the undercooling below Ms.
  • the strip After cooling the strip is heated by means of induction to enter the overageing section at a temperature of 350-450° C.
  • the austenite may become more stable due to carbon partitioning and (3) some carbide-free bainite may be formed which may also stabilise the austenite.
  • this product it is aimed to create very stable austenite, which means that no martensite will be formed in the final cooling.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
US14/232,474 2011-07-15 2012-07-15 Apparatus for producing annealed steels and process for producing said steels Abandoned US20140147697A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11174195 2011-07-15
EP11174195.5 2011-07-15
PCT/EP2012/063860 WO2013010968A1 (en) 2011-07-15 2012-07-15 Apparatus for producing annealed steels and process for producing said steels

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US (1) US20140147697A1 (ru)
EP (1) EP2732058B1 (ru)
JP (1) JP2014523970A (ru)
KR (1) KR101960992B1 (ru)
CN (1) CN103649347B (ru)
BR (1) BR112014000837A2 (ru)
CA (1) CA2841635C (ru)
ES (1) ES2675278T3 (ru)
MX (1) MX369049B (ru)
RU (1) RU2608257C2 (ru)
TR (1) TR201809068T4 (ru)
WO (1) WO2013010968A1 (ru)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016001711A1 (en) * 2014-07-03 2016-01-07 Arcelormittal Multipurpose processing line for heat treating and hot dip coating a steel strip
WO2016001888A3 (en) * 2014-07-03 2016-02-25 Arcelormittal Multipurpose processing line for heat treating and hot dip coating a steel strip
AT517848A4 (de) * 2016-04-15 2017-05-15 Andritz Tech And Asset Man Gmbh Verfahren und ofenanlage zum wärmebehandeln von metallbändern
US20180087122A1 (en) * 2016-09-27 2018-03-29 Novelis Inc. Pre-ageing systems and methods using magnetic heating
EP3348655A1 (en) * 2017-01-12 2018-07-18 Hitachi Metals, Ltd. Method of producing martensitic stainless steel strip
US10358691B2 (en) 2013-12-25 2019-07-23 Posco Apparatus for continuous annealing of strip and method for continuous annealing of same
US20200232063A1 (en) * 2019-01-23 2020-07-23 Drever International Method and furnace for thermally treating a high-resistance steel strip comprising a temperature homogenisation chamber
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WO2026051249A1 (zh) * 2024-09-03 2026-03-12 首钢集团有限公司 连续退火装置及方法

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CN103649347A (zh) 2014-03-19
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