EP4448810A1 - Heating method of a metallic product - Google Patents

Heating method of a metallic product

Info

Publication number
EP4448810A1
EP4448810A1 EP22818124.4A EP22818124A EP4448810A1 EP 4448810 A1 EP4448810 A1 EP 4448810A1 EP 22818124 A EP22818124 A EP 22818124A EP 4448810 A1 EP4448810 A1 EP 4448810A1
Authority
EP
European Patent Office
Prior art keywords
semi
steel product
finished steel
heating
fluidized bed
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.)
Pending
Application number
EP22818124.4A
Other languages
German (de)
French (fr)
Inventor
Akshay BANSAL
Benjamin BOISSIERE
Gérard Griffay
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.)
ArcelorMittal SA
Original Assignee
ArcelorMittal SA
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.)
Filing date
Publication date
Application filed by ArcelorMittal SA filed Critical ArcelorMittal SA
Publication of EP4448810A1 publication Critical patent/EP4448810A1/en
Pending legal-status Critical Current

Links

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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/53—Heating in fluidised beds
    • 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
    • C21D8/021—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 involving particular fabrication steps or treatments of ingots or slabs
    • 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
    • C21D8/0221—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 characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets

Definitions

  • the invention relates to a method for heating a semi-finished steel product.
  • steel products need to be reheated before undergoing forming process or heat treatment. This is for example the case of billets or bloom before hot rolling which are generally reheated, from room temperature to temperature above 1000°C, in a furnace.
  • the present invention relates to a method for heating a semi-finished steel product 2, being a slab, a billet or a bloom, comprising
  • a pre-heating step performed in a pre-heating device comprising a chamber 3 containing solid particles 4, a heat exchanger 5, a support 6 able to support said semi-finished steel product, a gas injector 7, and
  • said pre-heating step comprises the steps of : i. injecting a gas 12 into said first chamber 3 so as to form a first fluidized bed 8, ii. heating said fluidized bed 8 by means of said heat exchanger 5, iii. putting said semi-finished steel product 2, into said fluidized bed 8 such that said semi-finish steel product 2 is supported by said support 6 and such that said fluidized bed 8 is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 200°C to 1000°C, and said heating step comprises the step of heating said semi-finished steel product to a temperature from 1100 to 1400°C.
  • Figure 1 illustrated an embodiment of a device wherein the claimed method can be performed.
  • Figure 2 illustrated an embodiment of multiple pre-heating device where the pre-heating is performed by at least two pre-heating devices.
  • said semi-finished steel product being a slab or a billet or a bloom is to be laminated.
  • This device comprises a chamber 3 containing solid particles 4, a heat exchanger 5, a support able to support a semi-finished steel product 6 and a gas injector 7.
  • the chamber is preferentially able to receive more than one semi-finished steel product.
  • the support 6 is preferentially able to receive more than one semi-finished steel product.
  • the support can be a mesh basket.
  • the semi-finished steel product lies on said support.
  • the semi-finished steel product may be conveyed inside and outside the chamber by a rolling conveyor or may be placed inside the chamber by pick up means, such as cranes or any suitable pick up mean.
  • pick up means such as cranes or any suitable pick up mean.
  • the system disclosed in WO 2021 064 451 can be used to as pick up means.
  • said support is not used move said semi-finished product inside or outside the chamber 3. Dissociating the support system and the transport system, e.g. pick-up means, permits to reduce the number of transport system in case several semi-finished steel products are pre-heated simultaneously.
  • the chamber may be a closed chamber with a closable opening through which a semifinished steel product maybe be conveyed, but it could also have an open roof or any configuration suitable for semi-finished steel products conveying.
  • step i. of the pre-heating step a gas is injected into said chamber 3 so as to form a fluidized bed 8. This injection is done by means of the gas injector 7.
  • said gas injected in said chamber is heated.
  • said gas has a temperature from 200 to 1000°C. It permits to reduce the energy required to heat the fluidized bed at the preferred temperature range.
  • said gas is at least partly heated by a renewable energy source and/ or by recovered waste heat.
  • the recovered waste heat can for example come from reused fumes.
  • said gas injected in said chamber is heated by means of heating means powered in part or all by CO2 neutral electricity.
  • CO 2 neutral electricity includes notably electricity from renewable source which is defined as energy that is collected from renewable resources, which are naturally replenished on a human timescale, including sources like sunlight, wind, rain, tides, waves, and geothermal heat.
  • renewable source which is defined as energy that is collected from renewable resources, which are naturally replenished on a human timescale, including sources like sunlight, wind, rain, tides, waves, and geothermal heat.
  • the use of electricity coming from nuclear sources can be used as it is not emitting CO2 to be produced.
  • said solid particles of said fluidized bed are in a bubbling regime.
  • the gas velocity to be applied to get a bubbling regime depends on several parameters like the kind of gas used, the size and density of the particles or the size of the chamber which are easily managed by a person skilled in the art.
  • step ii. the fluidized bed is heated by means of the heat exchanger.
  • the heat exchanger 5 is able to transfer heat to said fluidized bed 8.
  • An entry pipe 9 is connected to said heat exchanger such that a transfer medium can be introduced into the heat exchanger by said entry pipe 9.
  • An exit pipe 11 is connected to said heat exchanger such that the transfer medium can be drained away from the heat exchanger by said exit pipe 11.
  • the walls of the chamber 3 can contain the heat exchanger.
  • step ii. said fluidized bed is heated at a temperature from 400 to 700°C, preferably from 500 to 700°C, and even more preferably from 600 to 700°C.
  • a transfer medium is circulating in said heat exchanger and is introduced into said heat exchanger at a temperature from 250°C to 1500°C.
  • said transfer medium is at least partly heated by a renewable energy source.
  • a transfer medium is circulating in said heat exchanger and is exiting said heat exchanger at a temperature from 150°C to 1000°C.
  • said gas is at least partly heated by a renewable energy source and/ or by recovered waste heat.
  • the recovered waste heat can for example come from reused fumes.
  • the step ii. happens simultaneously as the step i., so that while the solid particles form a fluidized bed, they are heated.
  • the semi-finished steel product is put inside the fluidized bed such that it can be heated by the fluidized bed. So, the steps i. and ii. are performed during the step iii. to allow the heat transfer from the heat exchanger to the fluidized bed and also from the heat exchanger to the semi-finished steel product.
  • said semi-finished steel product is at ambient temperature before being brought into the fluidized bed.
  • the whole semi-finished steel product is inside said fluidized bed.
  • step iv. the semi-finished steel product is taken out of the fluidized bed when it reaches a determined temperature.
  • said semi-finished steel product is taken out when its temperature is from 500°C to 700°C. Even more preferably, said semi-finished steel product is taken out when its temperature is from 600°C to 700°C.
  • the semi-finished steel product is heated in a furnace to a temperature from 1100°C to 1400°C. Such a heating range permits to perform a hot rolling.
  • said method comprises a hot rolling step, after the heating step, wherein said semi-finished steel product is hot rolled.
  • said gas injected in said chamber is air.
  • the gas injected by the gas injector is preferably an inert gas, such as argon or helium, or nitrogen or a mix of gases.
  • said gas injected in said chamber as a temperature close, or higher, to the one of the fluidised bed.
  • the gas is injected at a velocity from 1 to 30 cm.s .
  • a velocity range requires a low ventilation power and thus a reduced energy consumption
  • the solid particles have a size from 40 to 500 pm.
  • the solid particles have a heat capacity comprised from 500 to 2000 J.kg'kK 1 .
  • the bulk density of the solid particles is from 1400 to 4000 kg.m
  • the solid particles are ceramic particles.
  • the solid particles are made of glass or any other solid materials chemically stable up to 1000°C.
  • the solid particles can be made of SiC, Olivine, steel slag or alumina.
  • the solid particles are inert. It avoids any reaction with the semi-finished steel product.
  • the method according to the invention permits to heat, at least partly a semi-finished steel product by means of renewable energy and/ or recovered waste energy, in the pre-heating step.
  • the pre-heating step is performed by at least two pre-heating devices (1, 100).
  • Said at least two pre-heating devices are arranged such that the exit pipe (11) of a first preheating device (1) is connected to an entry pipe (90) of a second pre-heating device (100).
  • the pre-heating step comprises the steps of i. injecting a gas (12, 120) into the chamber (3, 30) of said first and second pre-heating devices so as to form fluidized beds (4, 40), ii. heating said fluidized beds (4, 40) by means of heat exchanger (5, 50), iii. putting said semi-finished steel product 2, into the fluidized bed (80) of said second preheating device (100) and onto said support (60) such said fluidized bed (80) is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 300°C to 500°C, v.
  • Such a pre-heating steps permits to heat the semi-finished steel product in several steps so as to increase the efficiency of the transfer medium passing through the heat exchangers.
  • the invention also relates to a method for heating a semi-finished steel product 2, comprising : a pre-heating step, performed in a pre-heating device 1 comprising a chamber 3 containing solid particles 4, a heat exchanger 5, a support 6 able to support said semi-finished steel product, a gas injector 7, and a rolling step performed in a rolling mill, wherein said pre-heating step comprises the steps of : i. injecting a gas 12 into said first chamber 3 so as to form a first fluidized bed 8, ii. heating said fluidized bed 8 by means of said heat exchanger 5, iii.
  • said rolling step comprises the step of rolling said semi-finished steel product at a temperature from 150 to 300°C.

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)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention relates to a method for heating a semi-finished steel product, comprising : a pre-heating step, performed in a pre-heating device comprising a chamber containing solid particles, a heat exchanger, a support able to support said semi-finished steel product, a gas injector, and a heating step, performed in a furnace, wherein, said pre-heating step comprises the steps of : i. injecting a gas into said first chamber so as to form a first fluidized bed, ii. heating said fluidized bed by means of said heat exchanger, iii. putting said semi-finished steel product, into said fluidized bed and onto said support such said fluidized bed is able to transfer heat to said semi-finished steel product, iv. taking out said semi-finished steel product when its temperature is from 200°C to 1000°C, and said heating step comprises the step heating said semi-finished product to a temperature from 1100 to 1400°C.

Description

HEATING METHOD OF A METALLIC PRODUCT
The invention relates to a method for heating a semi-finished steel product.
In the steel production, but more generally in metal production, steel products need to be reheated before undergoing forming process or heat treatment. This is for example the case of billets or bloom before hot rolling which are generally reheated, from room temperature to temperature above 1000°C, in a furnace.
However, such a reheating consumes a great amount of energy leading to emission of greenhouse gas. It is thus desirable to develop heating methods of semi-finished product that reduce the process impact on the environment.
It is a subject of this invention to provide such a heating method.
This is achieved by providing a method according to any one of the claims 1 to 10.
Other characteristics and advantages will become apparent from the following description of the invention.
The present invention relates to a method for heating a semi-finished steel product 2, being a slab, a billet or a bloom, comprising
- a pre-heating step, performed in a pre-heating device comprising a chamber 3 containing solid particles 4, a heat exchanger 5, a support 6 able to support said semi-finished steel product, a gas injector 7, and
- a heating step, performed in a furnace, wherein said semi-finished steel product is heated to a temperature from 1000 to 1400°C,
- a hot rolling step, after the heating step, wherein said semi-finished steel product is hot rolled, wherein, said pre-heating step comprises the steps of : i. injecting a gas 12 into said first chamber 3 so as to form a first fluidized bed 8, ii. heating said fluidized bed 8 by means of said heat exchanger 5, iii. putting said semi-finished steel product 2, into said fluidized bed 8 such that said semi-finish steel product 2 is supported by said support 6 and such that said fluidized bed 8 is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 200°C to 1000°C, and said heating step comprises the step of heating said semi-finished steel product to a temperature from 1100 to 1400°C.
Figure 1 illustrated an embodiment of a device wherein the claimed method can be performed.
Figure 2 illustrated an embodiment of multiple pre-heating device where the pre-heating is performed by at least two pre-heating devices.
Preferably, said semi-finished steel product, being a slab or a billet or a bloom is to be laminated.
This device comprises a chamber 3 containing solid particles 4, a heat exchanger 5, a support able to support a semi-finished steel product 6 and a gas injector 7. The chamber is preferentially able to receive more than one semi-finished steel product. The support 6 is preferentially able to receive more than one semi-finished steel product. The support can be a mesh basket. Preferably, in step iii., the semi-finished steel product lies on said support.
The semi-finished steel product may be conveyed inside and outside the chamber by a rolling conveyor or may be placed inside the chamber by pick up means, such as cranes or any suitable pick up mean. For example, the system disclosed in WO 2021 064 451 can be used to as pick up means. Even more preferably, said support is not used move said semi-finished product inside or outside the chamber 3. Dissociating the support system and the transport system, e.g. pick-up means, permits to reduce the number of transport system in case several semi-finished steel products are pre-heated simultaneously.
The chamber may be a closed chamber with a closable opening through which a semifinished steel product maybe be conveyed, but it could also have an open roof or any configuration suitable for semi-finished steel products conveying.
In step i. of the pre-heating step, a gas is injected into said chamber 3 so as to form a fluidized bed 8. This injection is done by means of the gas injector 7.
Preferably, said gas injected in said chamber is heated. Even more preferably, said gas has a temperature from 200 to 1000°C. It permits to reduce the energy required to heat the fluidized bed at the preferred temperature range. Even more preferably, said gas is at least partly heated by a renewable energy source and/ or by recovered waste heat. The recovered waste heat can for example come from reused fumes.
Even more preferably, said gas injected in said chamber is heated by means of heating means powered in part or all by CO2 neutral electricity.
CO2 neutral electricity includes notably electricity from renewable source which is defined as energy that is collected from renewable resources, which are naturally replenished on a human timescale, including sources like sunlight, wind, rain, tides, waves, and geothermal heat. In some embodiments, the use of electricity coming from nuclear sources can be used as it is not emitting CO2 to be produced.
Preferably, said solid particles of said fluidized bed are in a bubbling regime. The gas velocity to be applied to get a bubbling regime depends on several parameters like the kind of gas used, the size and density of the particles or the size of the chamber which are easily managed by a person skilled in the art.
In step ii., the fluidized bed is heated by means of the heat exchanger. The heat exchanger 5 is able to transfer heat to said fluidized bed 8. An entry pipe 9 is connected to said heat exchanger such that a transfer medium can be introduced into the heat exchanger by said entry pipe 9. An exit pipe 11 is connected to said heat exchanger such that the transfer medium can be drained away from the heat exchanger by said exit pipe 11. The walls of the chamber 3 can contain the heat exchanger.
Preferably, in step ii., said fluidized bed is heated at a temperature from 400 to 700°C, preferably from 500 to 700°C, and even more preferably from 600 to 700°C.
Preferably, a transfer medium is circulating in said heat exchanger and is introduced into said heat exchanger at a temperature from 250°C to 1500°C.
Preferably, said transfer medium is at least partly heated by a renewable energy source.
Preferably, a transfer medium is circulating in said heat exchanger and is exiting said heat exchanger at a temperature from 150°C to 1000°C.
Even more preferably, said gas is at least partly heated by a renewable energy source and/ or by recovered waste heat. The recovered waste heat can for example come from reused fumes.
The step ii. happens simultaneously as the step i., so that while the solid particles form a fluidized bed, they are heated. In step iii., the semi-finished steel product is put inside the fluidized bed such that it can be heated by the fluidized bed. So, the steps i. and ii. are performed during the step iii. to allow the heat transfer from the heat exchanger to the fluidized bed and also from the heat exchanger to the semi-finished steel product.
Preferably, said semi-finished steel product is at ambient temperature before being brought into the fluidized bed.
Preferably, the whole semi-finished steel product is inside said fluidized bed.
In step iv., the semi-finished steel product is taken out of the fluidized bed when it reaches a determined temperature.
Preferably, said semi-finished steel product is taken out when its temperature is from 500°C to 700°C. Even more preferably, said semi-finished steel product is taken out when its temperature is from 600°C to 700°C.
In the heating step, the semi-finished steel product is heated in a furnace to a temperature from 1100°C to 1400°C. Such a heating range permits to perform a hot rolling.
Preferably, said method comprises a hot rolling step, after the heating step, wherein said semi-finished steel product is hot rolled.
— PREFERRED EMBODIMENTS —
Preferably, said gas injected in said chamber is air. Alternatively, the gas injected by the gas injector is preferably an inert gas, such as argon or helium, or nitrogen or a mix of gases.
Preferably, said gas injected in said chamber as a temperature close, or higher, to the one of the fluidised bed.
Preferably, the gas is injected at a velocity from 1 to 30 cm.s . Such a velocity range requires a low ventilation power and thus a reduced energy consumption
Preferably, the solid particles have a size from 40 to 500 pm.
Preferably, the solid particles have a heat capacity comprised from 500 to 2000 J.kg'kK1.
Preferably, the bulk density of the solid particles is from 1400 to 4000 kg.m Preferably, the solid particles are ceramic particles. Preferably, the solid particles are made of glass or any other solid materials chemically stable up to 1000°C. For example, the solid particles can be made of SiC, Olivine, steel slag or alumina.
Preferably, the solid particles are inert. It avoids any reaction with the semi-finished steel product.
The method according to the invention permits to heat, at least partly a semi-finished steel product by means of renewable energy and/ or recovered waste energy, in the pre-heating step.
Alternatively, as illustrated in Figure 2, the pre-heating step is performed by at least two pre-heating devices (1, 100).
Said at least two pre-heating devices are arranged such that the exit pipe (11) of a first preheating device (1) is connected to an entry pipe (90) of a second pre-heating device (100).
In that case, the pre-heating step comprises the steps of i. injecting a gas (12, 120) into the chamber (3, 30) of said first and second pre-heating devices so as to form fluidized beds (4, 40), ii. heating said fluidized beds (4, 40) by means of heat exchanger (5, 50), iii. putting said semi-finished steel product 2, into the fluidized bed (80) of said second preheating device (100) and onto said support (60) such said fluidized bed (80) is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 300°C to 500°C, v. putting said semi-finished steel product 2, into the fluidized bed (8) of said second preheating device (1) and onto said support (6) such said fluidized bed (8) is able to transfer heat to said semi-finished steel product 2, vi. taking out said semi-finished steel product 2 when its temperature is from 500°C to 700°C.
Such a pre-heating steps permits to heat the semi-finished steel product in several steps so as to increase the efficiency of the transfer medium passing through the heat exchangers.
The invention also relates to a method for heating a semi-finished steel product 2, comprising : a pre-heating step, performed in a pre-heating device 1 comprising a chamber 3 containing solid particles 4, a heat exchanger 5, a support 6 able to support said semi-finished steel product, a gas injector 7, and a rolling step performed in a rolling mill, wherein said pre-heating step comprises the steps of : i. injecting a gas 12 into said first chamber 3 so as to form a first fluidized bed 8, ii. heating said fluidized bed 8 by means of said heat exchanger 5, iii. putting said semi-finished steel product 2, into said fluidized bed 8 such that said semi-finish steel product 2 is supported by said support 6 and such that said fluidized bed 8 is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 150°C to 350°C, and said rolling step comprises the step of rolling said semi-finished steel product at a temperature from 150 to 300°C.

Claims

7
CLAIMS A method for heating a semi-finished steel product 2, being a slab, a billet or a bloom, comprising :
- a pre-heating step, performed in a pre-heating device 1 comprising a chamber 3 containing solid particles 4, a heat exchanger 5, a support 6 able to support said semi-finished steel product, a gas injector 7, and
- a heating step performed in a furnace, wherein said semi-finished steel product is heated to a temperature from 1000 to 1400°C,
- a hot rolling step, after the heating step, wherein said semi-finished steel product is hot rolled, wherein, said pre-heating step comprises the steps of : i. injecting a gas 12 into said first chamber 3 so as to form a first fluidized bed 8, ii. heating said fluidized bed 8 by means of said heat exchanger 5, iii. putting said semi-finished steel product 2, into said fluidized bed 8 such that said semi-finish steel product 2 is supported by said support 6 and such that said fluidized bed 8 is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 200°C to 1000°C,. Method according to claim 1, , wherein said gas injected in said chamber is air. Method according to claim 1 or 2, , wherein, said solid particles of said fluidized bed are in a bubbling regime. Method according to any one of the claims 1 to 3, wherein in step ii., said fluidized bed is heated at a temperature from 400 to 700°C, preferably from 500 to 700°C, and even more preferably from 600 to 700°C. Method according to any one of the claims 1 to 4, wherein semi-finished steel product is taken out when its temperature is from 500°C to 700°C. 8 Method according to claim 5, wherein semi-finished steel product is taken out when its temperature is from 600°C to 700°C. Method according to any one of the claims 1 to 6, wherein a transfer medium is circulating in said heat exchanger and is introduced into said heat exchanger at a temperature from 250°C to 1500°C. Method according to any one of the claims 1 to 7, wherein a transfer medium is circulating in said heat exchanger and is exiting said heat exchanger at a temperature from 150°C to 1000°C. A method for heating a semi-finished steel product 2, being a slab, a billet or a bloom, comprising:
- a heating step, performed in a pre-heating device 1 comprising a chamber 3 containing solid particles 4, a heat exchanger 5, a support 6 able to support said semi-finished steel product, a gas injector 7, and
- a rolling step performed in a rolling mill, wherein said heating step comprises the steps of : i. injecting a gas 12 into said first chamber 3 so as to form a first fluidized bed 8, ii. heating said fluidized bed 8 by means of said heat exchanger 5, iii. putting said semi-finished steel product 2, into said fluidized bed 8 such that said semi-finish steel product 2 is supported by said support 6 and such that said fluidized bed 8 is able to transfer heat to said semi-finished steel product 2, iv. taking out said semi-finished steel product 2 when its temperature is from 150°C to 350°C, and said rolling step comprises the step of rolling said semi-finished steel product at a temperature from 150 to 300°C.
EP22818124.4A 2021-12-14 2022-12-02 Heating method of a metallic product Pending EP4448810A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/IB2021/061689 WO2023111633A1 (en) 2021-12-14 2021-12-14 Heating method of a metallic product
PCT/IB2022/061704 WO2023111760A1 (en) 2021-12-14 2022-12-02 Heating method of a metallic product

Publications (1)

Publication Number Publication Date
EP4448810A1 true EP4448810A1 (en) 2024-10-23

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Country Status (10)

Country Link
US (1) US20250019784A1 (en)
EP (1) EP4448810A1 (en)
JP (1) JP7778932B2 (en)
KR (1) KR20240090725A (en)
CN (1) CN118284709A (en)
CA (1) CA3237553A1 (en)
MX (1) MX2024007245A (en)
UA (1) UA130148C2 (en)
WO (2) WO2023111633A1 (en)
ZA (1) ZA202403407B (en)

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WO2025114741A1 (en) 2023-11-27 2025-06-05 Arcelormittal Device for heat transfer

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