KR20140056711A - Material for coating tundish for high carbon steel - Google Patents

Material for coating tundish for high carbon steel Download PDF

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Publication number
KR20140056711A
KR20140056711A KR1020120121960A KR20120121960A KR20140056711A KR 20140056711 A KR20140056711 A KR 20140056711A KR 1020120121960 A KR1020120121960 A KR 1020120121960A KR 20120121960 A KR20120121960 A KR 20120121960A KR 20140056711 A KR20140056711 A KR 20140056711A
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South Korea
Prior art keywords
coating layer
tundish
layer
molten steel
base
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Application number
KR1020120121960A
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Korean (ko)
Inventor
기웅간
조원재
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현대제철 주식회사
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Priority to KR1020120121960A priority Critical patent/KR20140056711A/en
Publication of KR20140056711A publication Critical patent/KR20140056711A/en

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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention relates to a material for coating a tundish for high carbon steel respectively having a coating layer for reducing pollution and a coating layer for facilitating the separation of an interior material, including: a steel skin layer for maintaining the shape of the tundish; an Al2O3-SiO2-based refractory layer formed on top of the steel skin layer; a first coating layer based on a material having a large difference in the coefficient of thermal expansion, positioned on top of the refractory layer; and a second coating layer positioned on top of the first coating layer, based on a material for reducing the generation of slag even when high carbon steel inside the tundish is in contact with molten steel.

Description

TECHNICAL FIELD [0001] The present invention relates to a tundish coating material for high carbon steels,

The present invention relates to a tundish coating material for high carbon steels, and more particularly, to a tundish coating material for high carbon steels, each of which has a coating layer for facilitating separation between a coating layer for reducing molten steel contamination and an interior material.

In general, a continuous casting machine is a machine which is produced in a steel making furnace, receives molten steel transferred to a ladle by a tundish, and supplies it to a mold for a continuous casting machine to produce a cast steel having a predetermined size.

The continuous casting machine includes a ladle for storing molten steel, a casting mold for forming a tundish and a molten steel that is guided in the tundish first to form a cast slab having a predetermined shape, and a casting member connected to the mold, A plurality of pinch rolls.

In other words, the molten steel introduced from the ladle and the tundish is transferred to the mold through the immersion nozzle, and is formed into a cast slab having a predetermined width, thickness and shape in the mold, is transported through the pinch roll, The cast slab is cut into slabs, blooms, billets and the like, which are cut by a cutter and have a predetermined shape.

Related Prior Art Korean Patent Publication No. 2009-0053248 (published on May 27, 2009, titled: tundish coating agent and tundish coating method using the same) is available.

DISCLOSURE OF THE INVENTION The present invention provides a tundish coating material for a high carbon steel for reducing reaction with molten steel to reduce inclusions and easily peel off the residue remaining in the tundish.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems.

According to an aspect of the present invention, there is provided a tundish coating material for high carbon steels comprising: an iron-clad layer for maintaining the shape of a tundish; A refractory layer formed of Al 2 O 3 -SiO 2 base on the iron-clad layer; A first coating layer disposed on the refractory layer and having a base material having a large difference in thermal expansion coefficient from the refractory layer as a base; And a second coating layer on the first coating layer, the second coating layer being based on a material whose inclusion generation is reduced even when the tundish is in contact with the high carbon steel while the molten steel touches the tundish.

Specifically, the first coating layer may be formed of a MgO base.

The second coating layer may be formed of an alumina base (Al 2 O 3 base).

In addition, the refractory layer may include an interior material and a permanent material.

The first coating layer may have a thickness of 5 mm or more and less than 30 mm.

Also, the second coating layer may be formed by varying the thickness of the molten steel according to the casting time.

As described above,

By forming the second coating layer formed of Al 2 O 3 Base, contamination of molten steel generated in the casting of high carbon steel is reduced, and thus the casting defects can be prevented.

In addition, the present invention has the effect of facilitating removal of the tundish residue due to the difference in thermal expansion from the refractory layer by forming the first coating layer formed of MgO base on the bottom surface of the second coating layer formed of Al 2 O 3 Base.

1 is a side view showing a continuous casting machine according to an embodiment of the present invention.
FIG. 2 is a conceptual view for explaining the continuous casting machine of FIG. 1 around a molten steel flow.
3 is a perspective view of the tundish of FIG. 2 viewed from above.
4 is a cut-away perspective view of a tundish having a structure of a tundish coating material for high carbon steels according to an embodiment of the present invention.
5 is a view of a layer of a tundish coating material for high carbon steels according to an embodiment of the present invention shown in "A"
6 is a graph showing the amount of inclusions produced in refractory materials of high carbon steel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a side view showing a continuous casting machine according to an embodiment of the present invention.

Continuous casting is a casting process in which a molten metal is continuously cast into a bottomless mold while continuously drawing a steel ingot or steel ingot. Continuous casting is used to manufacture slabs, blooms and billets, which are mainly rolled materials, and long products of simple cross-section such as square, rectangle and circle.

The shape of a continuous casting machine is classified into a vertical type and a vertical bending type. In Figs. 1 and 2, a vertical bending-like shape is illustrated.

1, the continuous casting machine may include a ladle 10 and a tundish 20, a mold 30, a secondary cooling stand 60 and 65, a pinch roll 70, and a cutter 90 have.

A tundish 20 is a container for receiving molten metal from a ladle 10 and supplying molten metal to a mold 30. The ladles 10 are provided in pairs to alternately receive molten steel and supply the molten steel to the tundish 20. In the tundish 20, the supply rate of the molten metal flowing into the mold 30 is controlled, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the nonmetallic inclusions are separated.

Mold 30 is typically made of water-cooled copper and allows the molten steel taken to be first cooled. The mold 30 has a pair of structurally opposed faces open to form a hollow portion for receiving molten steel. In the case of manufacturing the slab, the mold 30 includes a pair of barriers and a pair of end walls connecting the barriers. Here, the end wall has a smaller area than the barrier. The walls, mainly the walls, of the mold 30 may be rotated to be away from or close to each other to have a certain level of taper. This taper is set to compensate for the shrinkage due to the solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) varies depending on the carbon content according to the steel type, the kind of the powder (strong cold type Vs and cold type), the casting speed and the like.

The mold 30 is formed such that a solidified shell or a solidified shell 81 is formed so as to maintain the shape of the casting pluck pulled out from the mold 30 and to prevent the molten metal from being hardly outflowed from flowing out. . The water-cooling structure includes a method using a copper tube, a method of water-cooling the copper block, and a method of assembling a copper tube having a water-cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall surface of the mold. A lubricant is used to reduce the friction between the mold 30 and the solidification shell 81 during oscillation and to prevent burning. As the lubricant, there is oil to be sprayed and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become slag and the lubrication of the mold 30 and the solidifying shell 81 as well as the oxidation and nitrification of the molten metal in the mold 30 and keeping warm, It also functions to absorb the emerging nonmetallic inclusions. A powder feeder 50 is installed to feed the powder into the mold 30. The portion of the powder feeder 50 for discharging the powder is directed to the inlet of the mold 30.

The secondary cooling bands 60 and 65 further cool the molten steel that has been primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spraying means 65 for spraying water while being maintained by the support roll 60 so that the coagulation angle is not deformed. Most of the solidification of the cast steel is accomplished by the secondary cooling.

The pulling device employs a multi-drive type or the like in which a plurality of pinch rolls (70) are used so as to pull out the casting slides without slipping. The pinch roll 70 pulls the solidified leading end portion of the molten steel in the casting direction so that molten steel passing through the mold 30 can be continuously moved in the casting direction.

The cutter 90 is formed so as to cut a continuously produced musical instrument into a predetermined size. As the cutter 90, a gas torch or an oil pressure shearing machine may be employed.

Fig. 2 is a conceptual diagram for explaining the continuous casting machine of Fig. 1 centered on the flow of molten steel M. Fig.

Referring to this figure, the molten steel M flows into the tundish 20 while being accommodated in the ladle 10. For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends so as to be immersed in the molten steel in the tundish 20 so that the molten steel M is not exposed to the air and oxidized and nitrided. The case where the molten steel M is exposed to air due to breakage of the shroud nozzle 15 or the like is referred to as open casting.

The molten steel M in the tundish 20 is caused to flow into the mold 30 by the submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed at the center of the mold 30 so that the flow of the molten steel M discharged from both the discharge ports of the immersion nozzle 25 can be made symmetrical. The start, the discharge speed and the interruption of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 provided on the tundish 20 in correspondence with the immersion nozzle 25. Specifically, the stopper 21 can be vertically moved along the same line as that of the immersion nozzle 25 so as to open and close the inlet of the immersion nozzle 25. The control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method different from the stopper method. The slide gate controls the discharge flow rate of the molten steel (M) through the immersion nozzle (25) while the plate material slides horizontally in the tundish (20).

Molten steel (M) in the mold (30) starts to solidify from a portion in contact with the wall surface of the mold (30). This is because the periphery of the molten steel M is liable to lose heat by the water-cooled mold 30. The rear portion along the casting direction of the cast slab 80 is formed into a shape in which the non-solidified molten steel 82 is wrapped in the solidifying shell 81 by the method in which the peripheral portion first coagulates.

The non-solidified molten steel 82 moves together with the solidifying shell 81 in the casting direction as the pinch roll 70 (Fig. 1) pulls the tip end portion 83 of the fully-solidified cast slab 80. The non-solidified molten steel (82) is cooled by the spraying means (65) for spraying the cooling water in the up-shifting process. This causes the thickness of the non-solidified molten steel (82) to gradually decrease in the cast steel (80). When the cast steel 80 reaches one point 85, the cast steel 80 is filled with the solidified shell 81 as a whole. The solidification casting 80 having been solidified is cut to a predetermined size at the cutting point 91 and is divided into a slab P such as a slab or the like.

1, the apparatus including the support roll 60, the spraying means 65 and the pinch roll 70 is also referred to as a strand.

3 is a perspective view of the tundish 20 of FIG. 2 viewed from above. Referring now to the drawings, the tundish 20 is shown to receive a molten steel (M, FIG. 2) And a body 22 with an open top. The body 22 may include a metal foil disposed on the outer side and a refractory layer disposed on the inner side of the metal foil.

The body 22 may have various shapes, for example, a straight shape. However, in the present embodiment, the body 22 having a T shape is illustrated.

A portion of the body 22 is formed with a molten metal portion 23. The molten steel (M) flowing through the shroud nozzle (15) of the ladle (10) falls down. And the molten metal portion 23 can communicate with the sprue portion 24 having a larger area.

The casting portion 24 is a portion for guiding the molten steel M taken through the casting portion 23 to the mold 30. [ A plurality of openings 24a can be opened in the spout 24. An immersion nozzle 25 is connected to each of the lances 24a and guides the molten steel M of the tundish 20 to flow into the mold 30.

4 and 5 illustrate a tundish coating material for high carbon steels according to an embodiment of the present invention, wherein the tundish coating material comprises an iron-clad layer 110, a refractory layer 120, a first coating layer 130, (140).

The iron coating layer 110 is located on the outer wall of the tundish and maintains the shape of the tundish 20. That is, the iron-clad layer 110 has a container shape to form the outer shape of the tundish 20.

The refractory layer 120 is located on top of the ferromagnetic layer 110 and includes a permanent sheet 121 and an interior material 122. At this time, the permanent sheet 121 and the inner material 122 are made of Al 2 O 3 -SiO 2 base, respectively, but the ratios are different. The refractory layer 120 may have the outer shape of the tundish 20 in the same manner as the iron clad layer 110 so as to cover all of the container shapes forming the external shape of the tundish 20 .

The permanent field 121 is formed of Al 2 O 3 The ratio of SiO 2 is high, and the main purpose is to heat the molten steel by heat insulation.

The inner material 122 is made of Al 2 O 3 Was the proportion of SiO 2 is low, the main purpose of abrasion resistance is additionally required to Al 2 more permanent section (121) O as a function of insulating the molten steel as insulation as well as a permanent section 121, but for spill prevention of molten steel 3 ratio is relatively high.

Further, a heat insulating board (not shown) may be further formed between the iron-clad layer 110 and the refractory layer 120 for thermal insulation.

The first coating layer 130 is located on the refractory layer 120 and is based on a material having a larger thermal expansion difference than the refractory layer 120. At this time, the first coating layer 130 may be a MgO base having a larger difference in thermal expansion coefficient than the refractory layer 120 formed of Al 2 O 3 -SiO 2 base. Here, when the total ratio of the first coating layer 130, which is the magnesia base (MgO base) is 100 wt% excluding the binder, Mgo accounts for about 80 to 95 wt%, and the impurities of the SiO 2 component may be included to some extent.

Also, the first coating layer 130 does not directly contact the molten steel.

In addition, the first coating layer 130 should be at least 5 mm and less than 30 mm in the first coating layer. If the thickness is less than 5 mm, the second coating layer 140 and the first coating layer 130 react with each other to prevent the thermal expansion of the first coating layer 130 for removing the molten metal.

The thickness of the first coating layer 130 is not particularly limited as long as the thickness of the first coating layer 130 is 5 mm or more. However, as the thickness of the first coating layer 130 increases, the material ratio increases. Thus, preferably the first coating layer 130 is between 5 mm and 10 mm.

The second coating layer 140 is formed on the alumina base (Al 2 O 3 base) in the tundish 20 where the molten steel contacts the first coating layer 130. In this case, when the total proportion of the second coating layer 140 formed of alumina base (Al 2 O 3 Base) is 100 wt% excluding the binder, Al 2 O 3 occupies at least 90 wt%, and the raw material impurities FeO, TiO 2 , And an SiO 2 component may be included to some extent. At this time, the binder serves to solidify the refractory.

Here, the thickness of the second coating layer 140 may vary according to the casting time of the molten steel. If the amount of molten steel is large and the casting time is long, the second coating layer 140 may be formed thick.

The combined thickness of the first coating layer 130 and the second coating layer 140 is preferably about 20 mm to 30 mm.

The reason for forming the second coating layer 140 formed of an alumina base (Al 2 O 3 Base) is as follows.

Generally, only the magnesia base is used for the tundish (20) coating layer in high carbon steel casting. However, when the magnesium base is applied to the high carbon steel, the molten steel is contaminated at the casting temperature by the following reaction formula .

Scheme 1

MgO + C - > Mg + CO

As shown in FIG. 6, it can be seen that MgO produces significantly more inclusions than Al 2 O 3 . Accordingly, a second coating layer 140 formed of an alumina base (Al 2 O 3 Base) having a significantly smaller amount of inclusions than MgO is formed.

The reason for using MgO is that after the completion of the casting, the coating layer in the tundish 20 has hardened and is not completely removed, but the coating layer has to be peeled from the tundish 20 in order to remove the remaining debris. ) And a material with a high coefficient of thermal expansion.

That is, since the coefficient of thermal expansion of MgO is higher than that of the inner material 10 having the Al 2 O 3 -SiO 2 base, the residue can be easily removed.

Al 2 O 3 coated on the inner surface of the tundish 20 only when the coating layer of Al 2 O 3 is coated on the inner surface of the tundish 20, There is a problem that it is not easy to completely remove the residue remaining in the dish 20.

When the casting is completed, both the first coating layer and the second coating layer are peeled off to remove the residue to remove the residue in the tundish 20.

Accordingly, by forming the second coating layer formed of Al 2 O 3 Base, contamination of molten steel produced in high carbon steel casting is reduced, thereby preventing casting defects from being produced.

Further, the present invention provides a first coating layer formed of a magnesia base (MgO base) on the lower surface of a second coating layer formed of an alumina base (Al 2 O 3 Base) to facilitate removal of the tundish residue due to a difference in thermal expansion coefficient from the refractory layer There is an effect to make.

The tundish coating material for high carbon steels as described above is not limited to the construction and operation of the embodiments described above. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

10: Ladle 15: Shroud nozzle
20: tundish 25: immersion nozzle
30: Mold 40: Mold oscillator
50: Powder feeder 51: Powder layer
52: liquid fluidized bed 53: lubricating layer
60: Support roll 65: Spray
70: pinch roll 80: performance cast
81: Solidification shell 82: Non-solidified molten steel
83: tip portion 85: solidified point
87: oscillation trace 88: bulging zone
90: Cutter 91: Cutting point
110: iron iron layer 120: refractory layer
121: Permanent chapter 122: Interior material
130: first coating layer 140: second coating layer

Claims (6)

An iron-clad layer for maintaining the shape of the tundish;
A refractory layer formed of Al 2 O 3 -SiO 2 base on the iron-clad layer;
A first coating layer disposed on the refractory layer and having a base material having a large difference in thermal expansion coefficient from the refractory layer as a base; And
And a second coating layer on the first coating layer, the second coating layer being based on a material whose inclusion generation is reduced by contact with high carbon steel inside the tundish in contact with the molten steel.
The method according to claim 1,
Wherein the first coating layer is formed of a magnesia base (MgO base).
The method according to claim 1,
And the second coating layer is formed of an alumina base (Al 2 O 3 base).
The method according to claim 1,
Wherein the refractory layer comprises an interior material and a permanent sheet.
The method according to claim 1,
Wherein the first coating layer is at least 5 mm and less than 30 mm.
The method according to claim 1,
Wherein the second coating layer is formed by varying the thickness of the tundish coating material in accordance with casting time of molten steel.
KR1020120121960A 2012-10-31 2012-10-31 Material for coating tundish for high carbon steel KR20140056711A (en)

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