CN111097885B - Material heating device and continuous casting device - Google Patents

Material heating device and continuous casting device Download PDF

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Publication number
CN111097885B
CN111097885B CN201911020508.7A CN201911020508A CN111097885B CN 111097885 B CN111097885 B CN 111097885B CN 201911020508 A CN201911020508 A CN 201911020508A CN 111097885 B CN111097885 B CN 111097885B
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cover
tunnel furnace
area
replacement
heating
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CN111097885A (en
Inventor
赵庸硕
李赫骏
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Posco Holdings Inc
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Posco Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
    • F27B9/067—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated heated by induction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Metal Rolling (AREA)
  • Tunnel Furnaces (AREA)

Abstract

The present invention provides a material heating apparatus, including: a tunnel furnace for heating a material; and a replacement section for replacing at least any one of a first area around an introduction portion where the material is introduced into the tunnel furnace and a second area around a discharge portion where the material is discharged from the tunnel furnace, to insulate at least the material, the replacement section having: a capping mechanism for capping the material to reduce temperature loss of the material; and a cylindrical flat roller mechanism for moving the material through the cover mechanism in rotational contact with the widthwise bottom line of the material.

Description

Material heating device and continuous casting device
Technical Field
The present invention relates to a material heating apparatus and a continuous casting apparatus for improving surface defects.
Background
The statements herein merely provide background information related to the present disclosure and may not constitute prior art, as described in the specification.
Ensuring the temperature to perform rolling is a very important issue in the continuous casting process.
When rolling is performed, if the temperature on the outlet side of the finishing mill is not secured and the mechanical and metallurgical property values of the material cannot be satisfied, the product cannot be obtained.
Also, when the temperature is low, the load of the rolling mill becomes large to cause instability of the pass-through property, and therefore there is a risk of possibly causing an accident.
In the continuous casting process, in order to secure a temperature to perform rolling, a material (S1ab) is heated using a tunnel furnace to secure a desired material temperature.
Referring to fig. 1, most of the prior art continuous casting process of thin slabs (small mills) produces a final hot rolled product through one rolling mill using two continuous casting machines and two tunnel furnaces to ensure productivity.
However, when the final hot rolled product is produced through one rolling mill using two continuous casting machines and two tunnel furnaces as in the prior art, since the length of the tunnel furnace used is 200m or more and two are used, there is a problem in that energy consumption is large.
In addition, with the prior art continuous casting process, a material is cut with a cutter between a continuous casting machine and a tunnel furnace, and the thickness of the material is sequentially reduced by discontinuous intermittent rolling using a conveyor, thereby producing a product of a desired thickness.
With this type of intermittent rolling, the head of the slab enters the rolling mill every time each slab moves to the rolling mill, while the tail of the slab should exit the rolling mill, so the possibility of frequent operational accidents increases.
This problem may occur more frequently as the thickness of the hot rolled product is smaller.
In addition, since the head and tail portions are exposed to the outside from the side of the slab, the temperature is relatively low due to a larger energy loss, and thus there is a problem in that the thickness, width, and shape of the material are largely deviated.
Referring to fig. 2, a tunnel furnace used in the related art continuous casting process uses disc type rolls to transfer a material in a length direction D2 of the material.
The function of such disc rolls is to reduce the energy lost from the material in the direction of the roll by reducing the contact area with the material.
However, with this type of roller, if the foreign matter causes the rotation to be not smooth, scratches are caused on the material, thereby reducing the surface quality of the product.
Prior art documents
Patent document 1: KR 10-2000-0039452A
Disclosure of Invention
Technical problem
An aspect of the present invention is to provide a material heating apparatus that can save energy usage while ensuring strength of a material and improving surface defects of the material.
Technical scheme
In order to achieve the above object, an aspect of the present invention provides a material heating apparatus including: a tunnel furnace for heating a material; and a replacement section for replacing at least any one of a first area around an introduction portion where the material is introduced into the tunnel furnace and a second area around a discharge portion where the material is discharged from the tunnel furnace, to insulate at least the material, the replacement section having: a capping mechanism for capping the material to reduce temperature loss of the material; and a cylindrical flat roller mechanism for moving the material through the cover mechanism in rotational contact with the widthwise bottom line of the material.
Preferably, the replacement zone may also have an induction heating mechanism for inductively heating the material when the material cools below a set temperature.
Preferably, the replacement area may be provided with a combination of the cover mechanism and the flat roller mechanism on at least either one side of the first area and the second area.
Preferably, the replacement area may be provided with at least the cover mechanism and the flat roll mechanism in the first area, and may be provided with at least the cover mechanism and the flat roll mechanism and the induction heating mechanism in the second area.
Preferably, an induction heating mechanism may be provided behind the second zone and accurately control the outlet side temperature of the material leaving the second zone.
Preferably, the second zone may have a heat-retaining unit formed by at least the combination of the cover mechanism and the flat roller mechanism and a heating unit including at least the induction heating mechanism, the heat-retaining unit and the heating unit being alternately provided.
Preferably, the cover mechanism may be provided with a cover unit to cover between adjacent two of the flat roller mechanisms, and a plurality of the cover units may be provided in succession in the replacement area.
Preferably, the cover mechanism may have: an upper cover member provided in an upper region of the replacement region; and a lower cover member provided in a lower area of the replacement area, and covering the replacement area together with the upper cover member.
Preferably, the upper cover member may be provided to cover the entire upper area of the replacement area, and the lower cover member may be provided with a plurality of lower cover units spaced apart and provided to cover a partial lower area of the replacement area.
Preferably, a plurality of upper cover units may be provided in series to cover a part of the upper area of the replacement area, and a plurality of lower cover units may be provided in a spaced-apart relationship to cover a part of the lower area of the replacement area.
Preferably, the material heating apparatus may determine the replaceable length of the tunnel furnace to be replaced with the replacement section among the entire length of the tunnel furnace by the following equation (1).
Mathematical formula (1):
Figure BDA0002245713860000041
wherein, H: thickness of material [ mm ]]V, V: speed of material [ m/min ]]And T: average temperature of material at outlet side of continuous casting [ ° c]，LP: replaceable length of tunnel furnace m]。
Preferably, the material heating apparatus may determine a remaining length of the tunnel furnace, which is not replaced by the replacement section, from the entire length of the tunnel furnace by the following equation (2).
Mathematical formula (2):
LTF≥0.165HV+0.364
wherein, H: thickness of material [ mm ]]V, V: speed of material [ m/min ]]，LTF: residual length of tunnel furnace m]。
Preferably, the material heating apparatus may determine the amount of heat input to the material by the induction heating mechanism by the following equation (3).
Mathematical formula (3):
Figure BDA0002245713860000042
wherein, H: thickness of material [ mm ]]W: width of material [ mm]V, V: speed of material [ m/min ]]L, L: alternative length of tunnel furnace [ m ]]，LP: replaceable length of tunnel furnace m]And P: heat input to material [ W ]]。
In order to achieve the above object, an aspect of the present invention provides a material heating apparatus including: a tunnel furnace for heating a material; and a replacement section for replacing at least any one of a first area around an introduction portion where the material is introduced into the tunnel furnace and a second area around a discharge portion where the material is discharged from the tunnel furnace, to insulate at least the material, the replacement section having: a capping mechanism for capping the material to reduce temperature loss of the material; and an induction heating mechanism for induction heating the material when the material is cooled to a temperature below a set temperature.
In order to achieve the above object, an aspect of the present invention provides a continuous casting apparatus comprising: a continuous casting machine for continuously casting molten steel into a material of a predetermined thickness; any one of the foregoing material heating apparatuses for heating a material produced by the continuous casting machine; and a rolling mill for rolling the material heated in the material heating device.
Effects of the invention
According to an embodiment of the present invention, it is possible to save energy usage while securing strength of a material and improving surface defects of the material.
Drawings
Fig. 1 is a view showing a prior art continuous casting process.
Fig. 2 is a view showing the tunnel furnace of fig. 1 and a disc type roll applied to the tunnel furnace.
Fig. 3 is a view illustrating a material heating apparatus and a continuous casting apparatus according to an embodiment of the present invention.
Fig. 4 to 7b are views illustrating various embodiments of a tunnel furnace and an alternative zone of the material heating apparatus of fig. 3.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. However, the present invention can be modified in various ways, and the scope of the present invention is not limited to the following embodiments. In addition, embodiments of the present invention are provided to more fully describe the present invention to those of ordinary skill in the art. The shapes, sizes, and the like of the various elements in the drawings may be exaggerated in order to more clearly illustrate the present invention.
The material heating apparatus 30 according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 3 to 7b, a material heating apparatus 30 according to an embodiment of the present invention may include a tunnel furnace 100 and a replacement zone 200.
Referring to fig. 3 and 4, the material heating apparatus 30 may include: a tunnel furnace 100 for heating the material S; and a replacement section 200 for replacing at least any one of a first area 100-1 around an introduction portion where the material S is introduced into the tunnel furnace 100 and a second area 100-2 around a derivation portion where the material S is derived from the tunnel furnace 100 to keep warm at least the material S, the replacement section 200 may have: a cover mechanism 300 for covering the material S to reduce a temperature loss of the material S; and a cylindrical flat roller mechanism 400 for moving the material S through the cover mechanism 300 in rotational contact with the bobbin thread SL in the width direction D1 of the material S.
Referring to fig. 3, the tunnel furnace 100 is a unit for heating the material S produced by the continuous casting machine 10.
As one example, the material S produced by the continuous caster 10 may be a slab.
In addition, the material heating apparatus 30 of the present invention can be used to secure the temperature of the material in the rolling section after continuous casting.
Specifically, referring to fig. 3, the material heating apparatus 30 of the present invention may be disposed in front of the rolling mill 50 to heat the material S to ensure the temperature of the material in the rolling section.
Referring to fig. 3 and 4, the replacement section 200 is an assembly for replacing a partial section of the existing tunnel furnace 100 to reduce the length of the tunnel furnace 100 that heats the material S.
With respect to the replacement area 200, after a part of the tunnel section is removed, components of the cover mechanism 300, the flat roller mechanism 400, and the like, which constitute the replacement area 200, may be arranged.
The present invention replaces a partial section of the existing tunnel furnace 100 with the replacement section 200, thereby reducing the length of the tunnel furnace 100 heating the material S, saving the input energy and reducing the generation of surface defects of the material S.
The replacement section 200 may replace at least any one of the first and second sections 100-1 and 100-2 of the tunnel furnace 100 to insulate at least the material S.
The replacement section 200 may be provided on at least either one of the first section 100-1 in front of the tunnel oven 100 or the second section 100-2 in rear of the tunnel oven 100 to replace a portion of the tunnel oven 100.
The replacement zone 200 may replace one of the first zone 100-1 of the tunnel oven 100 or the second zone 100-2 of the tunnel oven 100.
As an example, the upper cover mechanism 300 and the flat roller mechanism 400 may be replaced in the second zone 100-2 of the tunnel furnace 100.
In addition, the zone 200 may be replaced in the first zone 100-1 of the tunnel furnace 100 or the second zone 100-2 of the tunnel furnace 100, respectively.
Referring to fig. 3 and 4, the material heating apparatus 30 of the present invention replaces a portion of the tunnel furnace 100 with the replacement section 200, thereby shortening the length of the tunnel furnace 100, saving the amount of energy used to be input into the tunnel furnace 100, simultaneously securing the strength of the material S, and improving the surface defects of the material S.
With the disc type roller 31 employed in the conventional tunnel furnace 100 shown in fig. 2, the contact with the material S is locally formed at a plurality of places, and thus there is a problem in that the possibility of generating surface defects of the material S due to scratches is increased.
Referring to fig. 3, the present invention replaces a portion of the tunnel furnace 100 with the replacement area 200 of the first area 100-1 or the second area 100-2 and replaces the disc type roller 31 used in the conventional tunnel furnace 100 shown in fig. 2 with the cylindrical flat roller mechanism 400, so that the bottom surface of the conveyed material S is in contact with the entire width direction D1 of the flat roller mechanism 400, thereby reducing surface defects of the material S caused by scratches.
In addition, in the case where a portion of the tunnel furnace 100 is replaced with the replacement section 200 as described in the present invention, the temperature of the material S may be relatively lower than in the case where heating is performed over the entire length of the tunnel furnace 100.
Therefore, as the temperature of the material S becomes relatively low, the strength of the material S increases to some extent, and the generation of surface defects of the material S can be reduced.
Referring to fig. 4, the covering mechanism 300 covers the material S to reduce the temperature loss of the material S, so that the material S can be insulated.
The cover mechanism 300 may be provided to cover the replacement area 200, and a plurality of flat roller mechanisms 400 may be disposed at intervals on the replacement area 200.
Referring to fig. 4, the flat roller mechanism 400 may be composed of a cylindrical member that moves the material S by being in rotational contact with the bobbin thread SL across the width direction D1 of the material S.
The base line SL of the material S means the entire length in the width direction D1 formed on the bottom surface of the material S.
That is, in the present invention, the flat roller mechanism 400 is in contact with the entire bottom line SL in the width direction D1 of the conveyed material S, so that the material S moves in the replacement area 200.
The flat roller mechanism 400 may have: a cylindrical roller body 410 which moves the material S through the cover mechanism 300 and is in rotational contact with the bobbin thread SL in the width direction D1 of the material S as a whole; and roller shafts 430 formed on both ends of the roller body 410.
When the entire bottom line SL of the material S in the width direction D1 is in contact with the top surface of the roller body 410, the load during the movement of the material S is dispersed to the top surface of the roller body 410 in contact with the entire bottom line SL of the material S in the width direction D1, so that the occurrence of surface defects on the conveyed material S can be reduced.
Referring to fig. 6a to 7b, the replacement area 200 may further include an induction heating mechanism 500 for induction heating the material S when the material S is cooled below a set temperature.
The replacement area 200 is provided with the induction heating mechanism 500 together with the cover mechanism 300 and the flat roll mechanism 400, so that the temperature of the material S can be adjusted to a set temperature.
Referring to fig. 4 and 5, the replacement area 200 may be provided with a combination of the cover mechanism 300 and the flat roller mechanism 400 on at least either side of the first area 100-1 and the second area 100-2.
As an example, the replacement area 200 may be provided with the cover mechanism 300 and the flat roller mechanism 400 in the first area 100-1 and the second area 100-2, respectively.
Of course, the induction heating mechanism 500 may be further provided in the first and second regions 100-1 and 100-2.
The replacement area 200 may be provided with at least the cover mechanism 300 and the flat roll mechanism 400 in the first area 100-1, and with at least the cover mechanism 300 and the flat roll mechanism 400 and the induction heating mechanism 500 in the second area 100-2.
As an example, referring to fig. 7a and 7b, the replacement area 200 may be configured with a combination of the cover mechanism 300 and the flat roll mechanism 400 in the first area 100-1, and a combination of the cover mechanism 300, the flat roll mechanism 400, and the induction heating mechanism 500 in the second area 100-2.
Of course, the induction heating mechanism 500 may be further disposed in the first area 100-1, so that a combination of the cover mechanism 300, the flat roller mechanism 400, and the induction heating mechanism 500 is disposed in the first area 100-1.
However, in consideration of the importance of temperature adjustment of the material S on the exit side of the tunnel furnace 100 and the increase in equipment cost when the induction heating mechanism 500 is disposed on both sides, it is more preferable to dispose the cover mechanism 300 and the flat roll mechanism 400 in the first area 100-1 and the cover mechanism 300, the flat roll mechanism 400, the induction heating mechanism 500 in the second area 100-2.
At this time, if the induction heating mechanism 500 of the second section 100-2 is disposed at the rear of the second section 100-2, there is an effect that the temperature of the outlet side of the material S leaving the replacement section 200 can be precisely controlled.
The replacement section 200 of the material heating apparatus 30 of the present invention may be provided with any one of 1) a combination of the cover mechanism 300 and the platen mechanism 400, 2) a combination of the cover mechanism 300 and the induction heating mechanism 500, or 3) a combination of the cover mechanism 300 and the platen mechanism 400 and the induction heating mechanism 500, in at least any one of the first area 100-1 and the second area 100-2.
As an example, referring to fig. 4 and 5, a combination of the cover mechanism 300 and the flat roller mechanism 400 may be disposed in the first area 100-1.
Although not shown in the drawings, a combination of the cover mechanism 300 and the flat roller mechanism 400 may be disposed in the second area 100-2.
Although not shown in the drawings, a combination of the cover mechanism 300 and the flat roller mechanism 400 may be disposed in the first area 100-1 and the second area 100-2, respectively.
As another example, referring to fig. 7a and 7b, a combination of the cover mechanism 300 and the flat roller mechanism 400 may be disposed in the first area 100-1, and a combination of the cover mechanism 300 and the flat roller mechanism 400 and the induction heating mechanism 500 may be disposed in the second area 100-2.
Of course, various combinations may be configured in addition to the illustrated configuration relationship.
Referring to fig. 6a to 7b, the induction heating mechanism 500 is disposed behind the second area 100-2, so that the outlet side temperature of the material S leaving the second area 100-2 can be precisely controlled.
The cover mechanism 300 and the flat roll are disposed in the second area 100-2 provided in connection with the tunnel furnace 100, and the induction heating mechanism 500 is disposed at the exit side from the cover mechanism 300, so that the exit side temperature of the material S can be precisely controlled.
The induction heating mechanism 500 induction-heats the material S so that the outlet side temperature of the material S leaving the second zone 100-2 can be adjusted to the final target temperature.
The final target temperature leaving the second zone 100-2 may be adjusted to ensure the exit side temperature of the rolling mill 50.
Because, if the outlet side temperature of the rolling mill 50 cannot be secured, the rolled material produced by the rolling mill 50 cannot satisfy the mechanical and metallurgical property values, and thus a desired rolled material product cannot be produced.
Referring to fig. 6a and 7a, a combination of a cover mechanism 300 and a flat roller mechanism 400 may be disposed at a lead-out portion of the material S from the tunnel furnace 100, and an induction heating mechanism 500 may be disposed therebehind.
In this case, the installation length of the cover mechanism 300 may be set to 2 times or more and 3 times or less of the installation length of the induction heating mechanism 500. This is to precisely control the outlet side temperature of the material S exiting the replacement section 200 by the induction heating mechanism 500 after the material S heated in the tunnel furnace 100 passes through the state of being kept warm for the shortest time in the cover mechanism 300.
Referring to fig. 6b and 7b, the second area 100-2 may have a heat-insulating unit U1 formed by at least the combination of the cover mechanism 300 and the flat roller mechanism 400 and a heating unit U2 including at least the induction heating mechanism 500, and the heat-insulating unit U1 and the heating unit U2 may be alternately disposed.
A plurality of the soak units U1 and a plurality of the heating units U2 may be provided in the second region 100-2, and the soak units U1 and the heating units U2 may be alternately arranged.
From the viewpoint of accurately controlling the outlet-side temperature of the material S leaving the second area 100-2, it is more preferable to dispose the heating unit U2 including the induction heating mechanism 500 at the rearmost side of the second area 100-2.
Referring to fig. 5, the cover mechanism 300 may be provided with a cover unit to cover between two adjacent flat roller mechanisms 400, and a plurality of the cover units may be arranged in series in the replacement area 200.
Referring to fig. 5, the cover mechanism 300 may be composed of a plurality of cover units, and the plurality of cover units may be connected to each other across the entire replacement area 200.
Each cover unit may be provided to cover an individual covering area formed between adjacent two flat roller mechanisms 400, and a plurality of cover units may be provided in series.
The adjacent flat roll mechanisms 400 are divided according to sections, and each section cover unit can be independently installed and detached, so that the effect of facilitating equipment maintenance is achieved.
Referring to fig. 4 and 5, the cover mechanism 300 may include: an upper cover member 310 disposed at an upper region of the replacement area 200; and a lower cover member 330 disposed at a lower region of the replacement area 200, covering the replacement area 200 together with the upper cover member 310.
The upper cover member 310 may be provided to cover an upper area of the replacement area 200, and the lower cover member 330 may be provided to cover a lower area of the replacement area 200.
The upper cover member 310 and the lower cover member 330 are provided to cover the transport area of the material S together at the replacement area 200, so that the temperature loss of the material S can be reduced.
Referring to fig. 4, the upper cover member 310 may be disposed to cover the entire upper area of the replacement area 200, and the lower cover member 330 may be disposed to be spaced apart by a plurality of lower cover units 330U disposed to cover a partial lower area of the replacement area 200.
The upper cover member 310 may be provided to cover the entire upper area of the replacement area 200 where a plurality of the flat roller mechanisms 400 are provided.
The lower cover unit 330U may be disposed to cover a portion of the lower area formed between adjacent two of the flat roller mechanisms 400, and a plurality of the lower cover units 330U may be disposed to be spaced apart.
A plurality of lower cover units 330U may be spaced apart and coupled to one upper cover member 310, respectively.
In a state where the upper cover member 310 and the plurality of lower cover units 330U are combined, a space in which the flat roller mechanism 400 is disposed, that is, a flat roller disposition region 350 may be formed in the cover mechanism 300, and the plurality of flat roller disposition regions 350 may be formed at predetermined intervals.
Referring to fig. 5, a plurality of upper cover units 310U may be connected to each other to cover a portion of the upper area of the replacement area 200, and a plurality of lower cover units 330U may be spaced apart from each other to cover a portion of the lower area of the replacement area 200 in the lower cover part 330.
The upper cover member 310 may be provided such that a plurality of upper cover units 310U are connected to each other to cover an upper area of the replacement area 200.
The upper cover unit 310U may form a cutting groove 311 that receives the flat roller mechanism 400.
The upper cover units 310U may be connected by abutting the end portions of two adjacent upper cover units 310U.
The lower cover member 330 may be provided such that a plurality of lower cover units 330U are disposed to be spaced apart and cover a lower area of the replacement area 200.
The lower cover unit 330U may be disposed between two adjacent flat roller mechanisms 400, and a plurality of the lower cover units 330U are disposed at intervals.
Referring to fig. 5, the flat roll mechanism 400 may be disposed in a space formed by the cutting slits 311 of two adjacent upper cover units 310U and a space formed between two adjacent lower cover units 330U, i.e., a flat roll disposition region 350.
The material heating apparatus 30 can determine the replaceable length of the tunnel furnace 100 to be replaced with the replacement section 200 in the entire length of the tunnel furnace 100 by the following mathematical formula (1).
Mathematical formula (1):
Figure BDA0002245713860000131
wherein, H: thickness of Material S [ mm]V, V: speed of material S [ m/min ]]And T: average temperature of the material S at the outlet side of continuous casting [. degree.C]，LP: alternative length m of tunnel furnace 100]。
The material heating device 30 can determine the remaining length of the tunnel furnace 100, which is not replaced by the replacement section 200, from the entire length of the tunnel furnace 100 by the following equation (2).
Mathematical formula (2):
LTF≥0.165HV+0.364
wherein, H: thickness of Material S [ mm]V, V: speed of material S [ m/min ]]，LTF: residual length [ m ] of tunnel furnace 100]。
As described above, the remaining length of the tunnel furnace 100 should satisfy the formula (2), otherwise, a sufficient temperature cannot be secured at the exit side of the tunnel furnace 100, and the flux plate becomes unstable, which may cause an accident.
The material heating apparatus 30 can determine the amount of heat input to the material S by the induction heating mechanism 500 by the following equation (3).
Mathematical formula (3):
Figure BDA0002245713860000141
wherein, H: thickness of Material S [ mm]W: width of material S [ mm ]]V, V: speed of material S [ m/min ]]L, L: alternate length m of tunnel furnace 100]，Lp: alternative length m of tunnel furnace 100]And P: heat input to material S W]。
Under the conditions of example 1 and example 2, it was checked by using the expressions (1), (2) and (3) whether the tunnel furnace 100 can be replaced with the replacement area 200 and whether the induction heating mechanism 500 needs to be provided, and the like as follows:
the conditions of example 1 are H: 90mm, V: 5.5m/min, W: 1550mm, T: 1200 ℃, length of tunnel furnace 100: 200 m.
The conditions of example 2 were H: 90mm, V: 5.5m/min, W: 1550mm, T: 1200 ℃, length of tunnel furnace 100: 200 m.
Wherein, H: thickness of Material S [ mm]V, V: speed of material S [ m/min ]]And T: average temperature of the material S at the outlet side of continuous casting [. degree.C]，LP: alternative length m of tunnel furnace 100]，LTF: residual length [ m ] of tunnel furnace 100]。
Mathematical formula (1):
Figure BDA0002245713860000151
mathematical formula (2):
LTF≥0.165HV+0.364
mathematical formula (3):
Figure BDA0002245713860000152
in example 1, when H: 90mm, V: 6.5m/min, W: 1650mm, T: 1250 ℃, length of tunnel furnace 100: 200m, the replaceable length L of the tunnel furnace 100 should be satisfiedPLess than or equal to 67.88m, the remaining length L of the tunnel furnace 100TF≥96.89m。
When the replacement length L of the tunnel furnace 100: at 60m, the tunnel furnace 100 may be replaced because the remaining length is 140 m.
When the replacement length L of the tunnel furnace 100: at 90m, due to LP< L, the tunnel furnace 100 has a remaining length of 110m, and an induction heating mechanism 500 needs to be provided in the replacement area 200.
When the heat quantity P to be input to the material S is required to be equal to or more than 4543702W and the efficiency of the induction heating mechanism 500 is 60%, the capacity of the induction heating mechanism 500 must be 7572837W, and if this condition is satisfied, it can be replaced.
When the replacement length L of the tunnel furnace 100: at 120m, due to LP< L, the tunnel furnace 100 has a remaining length of 80m and is therefore not replaceable.
In example 2, when H: 90mm, V: 5.5m/min, W: 1550mm, T: 1200 ℃, length of tunnel furnace 100: at 200m, the replaceable length of the tunnel furnace 100 is calculated by the equation (2).
Should satisfy the replaceable length L of the tunnel furnace 100PLess than or equal to 46.10m, the remaining length L of the tunnel furnace 100TF≥82.04m。
When the replacement length L of the tunnel furnace 100: at 40m, the tunnel furnace 100 may be replaced because the remaining length is 160 m.
When the replacement length L of the tunnel furnace 100: at 70m, due to LP< L, the remaining length of the tunnel furnace 100 is 130m, and it is necessary to provide the induction heating mechanism 500 in the replacement area 200.
When the heat quantity P to be input to the material S is required to be equal to or more than 4637901W and the efficiency of the induction heating mechanism 500 is 60%, the capacity of the induction heating mechanism 500 must be 7729835W, and if this condition is satisfied, it can be replaced.
When the replacement length L of the tunnel furnace 100: at 100m, due to LP< L, the remaining length of the tunnel furnace 100 is 100m, and the induction heating mechanism 500 needs to be provided in the replacement area 200.
When the heat quantity P to be input to the material S is required to be equal to or more than 10460216W and the efficiency of the induction heating mechanism 500 is 60%, the capacity of the induction heating mechanism 500 must be 17433694W, and if this condition is satisfied, it can be replaced.
A material heating apparatus 30 according to another embodiment of the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 3 and 6a to 7b, a material heating apparatus 30 according to an embodiment of the present invention may include a tunnel furnace 100 and a replacement zone 200.
The material heating apparatus 30 includes: a tunnel furnace 100 for heating the material S; and a replacement section 200 for replacing at least any one of a first area 100-1 around an introduction portion where the material S is introduced into the tunnel furnace 100 and a second area 100-2 around a derivation portion where the material S is derived from the tunnel furnace 100 to keep warm at least the material S, the replacement section 200 may have: a cover mechanism 300 for covering the material S to reduce a temperature loss of the material S; and an induction heating mechanism 500 for induction-heating the material S when the material S is cooled to a set temperature or lower.
Although not shown in the drawings, a combination of the cover mechanism 300 and the flat roller mechanism 400 may be disposed in the first area 100-1, and a combination of the cover mechanism 300 and the induction heating mechanism 500 may be disposed in the second area 100-2.
In particular, in the cover mechanism 300 and the flat roller mechanism 400, the induction heating mechanism 500, various forms of combinations of the cover mechanism 300 and the induction heating mechanism 500 may be applied to the replacement section 200 in addition to the flat roller mechanism 400.
In addition, it is needless to say that the various embodiments of the material heating apparatus 30 having the various embodiments described above can be applied to the continuous casting apparatus of the present invention.
Therefore, the configurations of the tunnel furnace 100 of the material heating apparatus 30 for the continuous casting apparatus, the cover mechanism 300 of the replacement section 200, and the induction heating mechanism 500 are the same as those of the material heating apparatus 30 already described, and are not described again to avoid repetition of the description.
The continuous casting apparatus is described in detail below with reference to the accompanying drawings.
Referring to fig. 3 to 7b, a continuous casting apparatus according to an embodiment of the present invention may include a continuous casting machine 10, a material heating apparatus 30, and a rolling mill 50.
The continuous casting apparatus may include: a continuous casting machine 10 for continuously casting molten steel into a material S of a predetermined thickness; the material heating device 30 is used for heating the material S produced by the continuous casting machine 10; and a rolling mill 50 for rolling the material S heated in the material heating device 30.
The continuous casting apparatus of the present invention may be a continuous casting machine 10, a material heating apparatus 30, and a rolling mill 50, which are sequentially connected.
Referring to fig. 3, the tunnel furnace 100 heats the material S cut by the cutter 20 after being produced by the continuous casting machine 10, and the heated material S is transferred to the rolling mill 50 to be rolled.
A coiler 60 may be disposed behind the rolling mill 50 to coil the rolled material S to form a coil.
The continuous casting machine 10 may continuously cast the molten steel into the material S having a thickness of 60mm to 120 mm.
Referring to fig. 1, the prior art produces a final hot rolled product by intermittent rolling from one rolling mill 50 using two continuous casting machines 10 and two tunnel furnaces 100.
With the prior art, the material S is cut between the continuous casting machine 10 and the tunnel furnace 100, and the thickness of the material S is sequentially reduced by discontinuous intermittent rolling, thereby producing a product of a desired thickness.
With such intermittent rolling employed in the prior art, whenever each slab moves to the rolling mill 50, the head (top) of the slab enters the rolling mill 50 and the tail (tail) of the slab should exit the rolling mill 50, so that the possibility of frequent occurrence of operational accidents increases.
The continuous casting apparatus of the present invention is directly connected to the rolling mill 50 via a continuous casting machine 10, a material heating apparatus 30 including a tunnel furnace 100 and a replacement section 200, so that, unlike the prior art, discontinuous intermittent rolling using a conveyor 40 is not required, only the head of the initial coil enters the rolling mill 50, and only the tail of the final coil exits the rolling mill 50, thereby having the effect of reducing operational accidents.
In addition, since the product is produced by the constant-speed isothermal rolling, there are advantages in that the thickness and the width dimension are excellent and the variation of the crown (crown) is small, compared to the material S produced by the conventional intermittent rolling.
A brief description of a continuous casting process according to one embodiment of a continuous casting apparatus follows.
The material can be made by the following steps: a material S production step of continuously casting molten steel into a material S of a predetermined thickness by the continuous casting machine 10; a material S heating step of heating the material S in the tunnel furnace 100; a rolling step of rolling the material S heated in the tunnel furnace 100; and a coiling step of coiling the rolled material after rolling.
At this time, in the material S production step, the continuous casting machine 10 may cast the molten steel at a casting speed of 4 to 8mpm to manufacture a slab of the material S having a thickness in the range of 60 to 120 mm.
In addition, it is needless to say that the various embodiments of the material heating apparatus 30 having the various embodiments described above can be applied to the continuous casting apparatus of the present invention.
Therefore, the construction of the tunnel furnace 100, the replacement area 200 of the material heating apparatus 30 for the continuous casting apparatus is the same as that of the material heating apparatus 30 already described, and is not described again to avoid repetition of the description.
The embodiments of the present invention have been described in detail above, but it is apparent to those skilled in the art that the scope of the claims of the present invention is not limited thereto, and various modifications and variations can be made without departing from the technical idea of the present invention described in the claims.
Description of the symbols
10: the continuous casting machine 20: cutting machine
30: material heating device 31: disc type roller
40: the conveyor 50: rolling mill
60: the coiler 100: tunnel furnace
100-1: first region 100-2: second region
200: replacement area 300: cover mechanism
310: upper cover member 310U: upper cover unit
311: cutting groove 330: lower cover part
330U: the lower cover unit 350: flat roll arrangement area
400: the flat roller mechanism 410: roller body
430: roller shaft 500: induction heating mechanism
D1: width direction D2: length direction of the film
S: material SL: bottom line
U1: heat preservation unit U2: heating unit

Claims (11)

1. A material heating apparatus, comprising:
a tunnel furnace for heating a material; and
a replacement zone for replacing at least any one of a first zone around an introduction portion where material is introduced into the tunnel furnace and a second zone around a discharge portion where material is discharged from the tunnel furnace, to insulate at least the material,
the replacement area has:
a capping mechanism for capping the material to reduce temperature loss of the material;
a cylindrical flat roller mechanism for moving the material through the cover mechanism by being brought into rotational contact with a widthwise bottom line of the material; and
an induction heating mechanism for induction-heating the material when the material is cooled to a temperature lower than a set temperature,
the replacement area is provided with at least the cover mechanism and the flat roll mechanism in the first area, and is provided with at least the cover mechanism and the flat roll mechanism and the induction heating mechanism in the second area.
2. The material heating apparatus according to claim 1, characterized in that:
the induction heating mechanism is disposed behind the second zone and precisely controls the outlet-side temperature of the material exiting the second zone.
3. The material heating apparatus according to claim 1, characterized in that:
the second area is provided with a heat preservation unit formed by at least combining the cover mechanism and the flat roller mechanism and a heating unit at least comprising the induction heating mechanism,
the heat preservation unit and the heating unit are alternately arranged.
4. The material heating apparatus according to claim 1, characterized in that:
the cover mechanism is provided with a cover unit to cover between two adjacent flat roller mechanisms, and a plurality of the cover units are arranged in connection in the replacement area.
5. The material heating apparatus according to claim 1, characterized in that:
the cover mechanism has:
an upper cover member provided in an upper region of the replacement region; and
and a lower cover member provided at a lower area of the replacement area, and covering the replacement area together with the upper cover member.
6. The material heating apparatus according to claim 5, characterized in that:
the upper cover member is provided to cover the entire upper area of the replacement area,
the lower cover member is provided with a plurality of lower cover units at intervals, and the lower cover units are arranged to cover a part of the lower area of the replacement area.
7. The material heating apparatus according to claim 5, characterized in that:
the upper cover part is provided with a plurality of upper cover units which are arranged to cover partial upper areas of the replacement areas,
the lower cover member is provided with a plurality of lower cover units at intervals, and the lower cover units are arranged to cover a part of the lower area of the replacement area.
8. The material heating apparatus according to claim 1, characterized in that:
the replaceable length of the tunnel furnace to be replaced with the replacement section among the entire lengths of the tunnel furnace is determined by the following equation (1),
mathematical formula (1):
Figure FDA0003098695960000031
wherein, H: thickness of material [ mm ]]V, V: speed of material [ m/min ]]And T: average temperature of material at outlet side of continuous casting [ ° c]，LP: replaceable length of tunnel furnace m]。
9. The material heating apparatus according to claim 8, characterized in that:
the remaining length of the tunnel furnace not replaced by the replacement zone among the entire lengths of the tunnel furnace is determined by the following equation (2),
mathematical formula (2):
LTF≥0.165HV+0.364
wherein, H: thickness of material [ mm ]]V, V: speed of material [ m/min ]]，LTF: residual length of tunnel furnace m]。
10. The material heating apparatus according to claim 1, characterized in that:
the amount of heat input to the material by the induction heating mechanism is determined by the following equation (3),
mathematical formula (3):
Figure FDA0003098695960000032
wherein, H: thickness of material [ mm ]]W: width of material [ mm]V, V: speed of material [ m/min ]]L, L: alternative length of tunnel furnace [ m ]]，LP: replaceable length of tunnel furnace m]And P: heat input to material [ W ]]。
11. A continuous casting apparatus comprising:
a continuous casting machine for continuously casting molten steel into a material of a predetermined thickness;
a material heating apparatus according to any one of claims 1 to 10, for heating a material produced by the continuous casting machine; and
a rolling mill for rolling the material heated in the material heating device.
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