KR101239536B1 - Adiabatic keeping warm stuff for ladle and method for keeping warm of molten steel using the same - Google Patents

Adiabatic keeping warm stuff for ladle and method for keeping warm of molten steel using the same Download PDF

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KR101239536B1
KR101239536B1 KR1020100125004A KR20100125004A KR101239536B1 KR 101239536 B1 KR101239536 B1 KR 101239536B1 KR 1020100125004 A KR1020100125004 A KR 1020100125004A KR 20100125004 A KR20100125004 A KR 20100125004A KR 101239536 B1 KR101239536 B1 KR 101239536B1
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insulation
ladle
molten steel
insulating material
thermal insulation
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KR1020100125004A
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Korean (ko)
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KR20120063848A (en
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김기수
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주식회사 포스코
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  • Treatment Of Steel In Its Molten State (AREA)
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Abstract

The present invention relates to a ladle insulation insulation and excellent molten steel thermal insulation using the same by adding MgO powder on a conventional ladle insulation insulation, excellent temperature reduction and erosion resistance of molten steel. In the ladle insulation insulation to be injected in order to reduce the temperature drop of the molten steel according to the present invention, in weight%, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : over 0 ~ 2 1% or less, MgO: 5%-10%, Carbon: 0.2% or less (including 0), Sulfur: 0.2% or less (including 0), The 1st heat insulating material which consists of a remainder binder and an inevitable component; And a second heat insulating material made of MgO powder on the first heat insulating material. As a result, not only the molten steel having excellent cleanliness can be produced, but also the insulation and corrosion resistance of the molten steel can be improved.

Description

Ladle insulation thermal insulation material and molten steel insulation method using the same {Adiabatic keeping warm stuff for ladle and method for keeping warm of molten steel using the same}

The present invention relates to a ladle thermal insulation thermal insulation and a molten steel thermal insulation method using the same, and more particularly to a ladle thermal insulation thermal insulation and a molten steel thermal insulation using the same to reduce the temperature drop of molten steel.

In general, in the converter-centered refining process, stainless steel requires various characteristics such as workability and fatigue resistance, so that clean molten steel must be made. Therefore, such molten steel goes through various processes, and thus, a phenomenon in which the molten steel temperature drops is inevitable. In particular, the molten steel after the out-of-furnace refining stays in the ladle for more than 1 hour until the completion of continuous casting, so the temperature drop of the molten steel is severe. As a result, a thermal insulation material is injected into the upper part of the slag immediately after the end of the external refining to reduce the temperature drop of the molten steel.

In general, the basic condition to be kept insulator is a solid phase, the heat insulation layer should be formed for a long time to reduce the heat dissipation as possible. In addition, the thermal insulation material should not inhibit the slag intrinsic properties, that is, the ability to absorb inclusions and the erosion resistance to dolomite in the refractory material even when the thermal insulation material reacts with the slag. However, in general ladle insulation insulating material, Al 2 O 3 and SiO 2 are main components, and other clay materials are composed. For this reason, only the heat insulation effect depending on the compositions can be expected, and also has a disadvantage in that the absorption ability of the inclusions floating in the molten steel to rise to the surface layer is inferior.

An object of the present invention is to provide a ladle insulation insulation and excellent molten steel thermal insulation using the same by reducing the temperature drop and corrosion resistance of molten steel by injecting MgO powder on a conventional ladle insulation insulation.

In the ladle insulation insulation to be injected in order to reduce the temperature drop of the molten steel according to the present invention, in weight%, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : over 0 ~ 2 1% or less, MgO: 5%-10%, Carbon: 0.2% or less (including 0), Sulfur: 0.2% or less (including 0), The 1st heat insulating material which consists of a remainder binder and an inevitable component; And a second heat insulating material made of MgO powder on the first heat insulating material.

Here, the second thermal insulation material may include, by weight%, MgO: 85 to 95%, C: greater than 0 to 5% and inevitably contained components.

In addition, the ladle insulation insulation may be applied to silicon deoxidation steel.

In addition, the first heat insulating material may have a basicity (CaO / SiO 2) of 0.8 to 1.2.

In the molten steel thermal insulation method using a ladle insulation thermal insulation material to reduce the temperature drop of the molten steel according to the present invention, the step of refining the stainless steel outside the furnace; After the furnace refining by weight% on the top of the slag, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : more than 0 ~ 2%, MgO: 5% to 10%, carbon: Including 0.2% or less (including 0), sulfur: 0.2% or less (including 0), the remaining binder and the first thermal insulation material consisting of the components inevitably contained; And injecting a second heat insulating material made of MgO powder on the first heat insulating material.

Here, the first insulation may be added after the final temperature and the composition of the composition.

In addition, the second heat insulating material may include, by weight%, MgO: 85 to 95%, C: greater than 0 to 5%, and an inevitable component.

In addition, the first heat insulating material may have a basicity (CaO / SiO 2) of 0.8 to 1.2.

According to the present invention, it is possible to produce molten steel having excellent cleanliness by adding ordinary ladle insulation insulating material and MgO powder to molten steel, as well as improving the thermal insulation strength and erosion resistance of molten steel.

1 is a cross-sectional view showing a dolomite portion where slag erosion occurs in a general ladle;
2 is a cross-sectional view showing a state in which the first insulation and the second insulation is added to the ladle according to the present invention.
Figure 3 is a flow chart showing a process of injecting the first and second insulating material to the ladle for thermal insulation of molten steel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention and other details necessary for those skilled in the art to understand the present invention with reference to the accompanying drawings. However, the present invention may be embodied in various different forms within the scope of the claims, and thus the embodiments described below are merely exemplary, regardless of expression.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a cross-sectional view showing a portion where slag erosion occurs in a general ladle.

Referring to FIG. 1, in general, the thermal insulation material 2 is introduced into the slag 4 inside the ladle 1 immediately after the end of the external refining to reduce the temperature drop of the molten steel 3. At this time, there is a problem of inhibiting the characteristics of the slag inherent, such as erosion occurs in the dolomite (1a) forming the inner surface of the ladle 1 by injecting the insulating material (2).

Accordingly, the present invention provides a ladle insulation insulating material that does not inhibit the inclusion absorbing ability and erosion resistance to the dolomite (1a), which is an inherent characteristic of slag.

Ladle insulation thermal insulation material in the present invention is to enhance the Al 2 O 3 inclusion reduction function, it is preferable to apply only to the silicon deoxidation steel that can minimize the Al 2 O 3 inclusion content.

2 is a cross-sectional view showing a state in which the first insulation and the second insulation is added to the ladle according to the present invention.

Referring to FIG. 2, the heat insulating insulating material of the ladle 1 according to the present invention includes a first heat insulating material 2 and a second heat insulating material 5. The first heat insulating material 2 is in weight percent, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : greater than 0 to 2%, MgO: 5% to 10%, carbon: 0.2% or less (including 0), sulfur: 0.2% or less (including 0), the remaining binder and inevitably contained components. The basicity (CaO / SiO 2 ) is 0.8 to 1.2.

In addition, the second insulation 5 is made of MgO powder, the MgO powder may include a component by weight, MgO: 85 ~ 95%, C: 0 ~ 5% and inevitably contained.

Hereinafter, the reason for numerical limitation on the composition of the components of the first insulation 2 and the second insulation 5 will be described.

First, the reason for numerical limitation for each component composition of the 1st heat insulating material 2 is demonstrated.

CaO and SiO 2 Each contains 40% to 50% by weight, and adjusts the basicity expressed in CaO / SiO 2 to 0.8 to 1.2, since the reduction performance of Al 2 O 3 is significantly lowered out of the range. to be.

Al 2 O 3 contains more than 0% and 2%, and MgO contains 5% and 10%. These two composition ranges are the metallurgical best composition for silicon deoxidized steel. That is, it is the slag 4 which is low in erosion of magnesia type refractory, and is excellent in the absorption ability of an alumina inclusion in steel. Thus, the first insulation material (2), and the MgO and Al 2 O 3 is essential in order not to inhibit the physical properties of the slag (4), the amount of addition of Al 2 O 3 In the same level as each of the slag 4 has more than 0 to 2 %, MgO preferably contains 5% to 10%.

In addition, sulfur and carbon may include 0.2% or less (including 0), respectively, in order to prevent sulfur and carbon from being mixed in the molten steel 3.

In addition, the reason for numerical limitation of each component composition of the 2nd heat insulating material 5 is demonstrated.

MgO contains 85% to 95% of the second heat insulating material (5), which not only prevents erosion of the dolomite (1a) as a main component of the second heat insulating material (5) but also is excellent in heat insulating ability and thus contains carbon and inevitably. It is preferable that all components except the component to be composed of MgO. In other words, in the present invention, the second insulating material 5 is a component included to simultaneously satisfy two characteristics of the erosion (1a) erosion and the insulating ability.

In addition, in order to prevent carbon from being incorporated into the molten steel 3, the carbon may include 5% or less.

3 is a flowchart illustrating a process of adding a first insulating material and a second insulating material to a ladle for thermal insulation of molten steel.

Referring to Figure 3, the molten steel thermal insulation method using a ladle insulation insulation to be injected in order to reduce the temperature drop of the molten steel according to the present invention first to the outside of the stainless steel. Then, in weight percent on the slag, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : over 0 to 2%, MgO: 5% to 10%, carbon: 0.2 1% or less (including 0), sulfur: 0.2% or less (including 0), the first thermal insulation material consisting of the remaining binder and inevitably contained components is added. Thereafter, a second heat insulating material made of MgO powder is added to the first heat insulating material.

At this time, it is preferable that the first insulation and the second insulation are added after the final temperature and the composition of the components.

(Example)

In this embodiment, the ladle insulation insulation was carried out to derive a composition that satisfies the essential condition that it must exist in the solid phase for a long time. That is, the components other than CaO and SiO 2 is to be constant, and changing the basicity and the insulation composition, shows the test results of the composition was changed to basicity.

Table 1 shows the thermal insulation power, the degree of erosion of dolomite in the slag portion of the ladle refractory, and the absorption ability of Al 2 O 3 inclusions according to the composition of the ladle insulation thermal insulation material generally input. That is, Table 1 shows each characteristic after using only the ladle insulation insulation used as the first insulation in the present invention.

division Chemical Composition and Characteristics Test result CaO (%) SiO 2 (%) Al 2 O 3 (%) MgO (%) C, S, etc. (%) basicity
(CaO / SiO 2 ) Warmth Dolomite erosion Al 2 O 3 inclusion absorption Comparison 1 40 50 2 5 3 0.8 Inferior Big Big Comparative material 2 45 45 2 5 3 1.0 Inferior Big Big Comparative material 3 50 40 2 5 3 1.2 Inferior small usually Comparison 4 50 40 2 5 3 1.0 Good small small Comparative material 5 45 45 2 5 3 1.2 Good small small

In Table 1, when the temperature drop rate of the existing molten steel is 0.3 ~ 0.4 ℃ / min was shown to be good thermal insulation, and above that it was expressed inferior. In addition, the Al 2 O 3 inclusion absorption capacity was expressed as low Al 2 O 3 absorption capacity if the increase in the amount of Al 2 O 3 inclusions before and after adding the insulating material is higher than when using the conidia lime as an insulating material.

As shown in Table 1, Comparative Materials 1 to 5 have a need to improve the thermal insulation power and dolomite erosion erosion degree. For example, in the case of the comparative material 1, the thermal insulation power is also inferior, and the degree of dolomite erosion is large, and both need to be improved. In Comparative Material 3, the degree of dolomite erosion was small, but the thermal insulation was inferior. Therefore, it is necessary to improve the insulation and dolomite erosion at the same time.

To this end, after the first insulating material of Comparative Materials 1 to 5 of Table 1 was added to the molten steel, a second insulating material made of MgO powder was further added to the upper portion. Here, MgO powder is in weight percent, MgO: 85 to 95%, C: greater than 0 to 5% and inevitably contains a component. Table 2 below shows the results of adding the first insulation and the second insulation.

division Test result Warmth Dolomite erosion Al 2 O 3 inclusion absorption Inventory 1 Good small Big Inventory 2 Good small Big Invention 3 Good small usually Invention 4 Good small small Invention Article 5 Good small small

After injecting the first insulating material of Table 1 into the molten steel of the invention materials 1 to 5, and further added a second insulating material made of MgO powder on the upper portion, the absorption capacity of Al 2 O 3 inclusions of each insulation material is Although the same, the insulation and the degree of dolomite erosion were improved in all inventions.

That is, when the second insulation is made of MgO powder after the first insulation is added as in the present invention, it can be seen that the insulation and dolomite erosion properties are improved at the same time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention.

The scope of the above-described invention is defined in the following claims, which are not bound by the description of the specification, and all modifications and variations belonging to the equivalent scope of the claims will belong to the scope of the present invention.

1: Ladle 1a: Dolomite
2: insulation material 3: molten steel
4: slag

Claims (8)

In the ladle insulation thermal insulation material to reduce the temperature drop of molten steel,
By weight, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : over 0 to 2%, MgO: 5% to 10%, carbon: 0.2% or less (including 0) Sulfur: 0.2% or less (including 0), the first insulating material comprising the remaining binder and the component inevitably contained; And
Ladle insulation insulating material comprising ;; a second insulating material consisting of MgO powder in the weight percent above the first insulating material, MgO: 85 ~ 95%, C: greater than 0 to 5% and inevitably contained. delete The method of claim 1,
The ladle insulation insulation is ladle insulation insulation applied to the silicon deoxidized steel. The method of claim 1,
The first thermal insulation material is a ladle insulation insulation material having a basicity (CaO / SiO2) of 0.8 to 1.2. In the molten steel thermal insulation method using a ladle insulation thermal insulation material is injected to reduce the temperature drop of molten steel,
Out-refining stainless steel;
After the furnace refining by weight% on the top of the slag, CaO: 40% to 50%, SiO 2 : 40% to 50%, Al 2 O 3 : more than 0 ~ 2%, MgO: 5% to 10%, carbon: Including 0.2% or less (including 0), sulfur: 0.2% or less (including 0), the remaining binder and the first thermal insulation material consisting of the components inevitably contained; And
Ladle insulation comprising; injecting a second insulating material consisting of MgO powder in the weight percent, MgO: 85 ~ 95%, C: greater than 0 to 5% and inevitably contained in the upper portion of the first insulating material; Molten steel thermal insulation method using insulation. The method of claim 5,
The first thermal insulation material is a molten steel insulation method using a ladle insulation insulation material to be added after the final temperature and component composition. delete The method of claim 5,
The first thermal insulation material is a molten steel thermal insulation method using a ladle insulation insulation material having a basicity (CaO / SiO2) of 0.8 ~ 1.2.
KR1020100125004A 2010-12-08 2010-12-08 Adiabatic keeping warm stuff for ladle and method for keeping warm of molten steel using the same KR101239536B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109804091A (en) * 2016-09-12 2019-05-24 株式会社Posco Barrier material and for use its manufacture steel alloy method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5662662A (en) * 1979-10-25 1981-05-28 Nippon Steel Corp Molten steel heat insulating method of less carburization
KR0136158B1 (en) * 1994-12-30 1998-07-01 김종진 Thermal insulation material for ladle
KR100436506B1 (en) * 1997-04-30 2004-08-18 주식회사 포스코 Ladle heat-insulating material for ultra-low carbon special molten steel, excellent in heat keeping ability, alumina absorptivity, and corrosion-resistance to magnesia refractory
KR100594682B1 (en) * 2004-06-08 2006-06-30 호진산업(주) composition of keeping warm material coal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5662662A (en) * 1979-10-25 1981-05-28 Nippon Steel Corp Molten steel heat insulating method of less carburization
KR0136158B1 (en) * 1994-12-30 1998-07-01 김종진 Thermal insulation material for ladle
KR100436506B1 (en) * 1997-04-30 2004-08-18 주식회사 포스코 Ladle heat-insulating material for ultra-low carbon special molten steel, excellent in heat keeping ability, alumina absorptivity, and corrosion-resistance to magnesia refractory
KR100594682B1 (en) * 2004-06-08 2006-06-30 호진산업(주) composition of keeping warm material coal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109804091A (en) * 2016-09-12 2019-05-24 株式会社Posco Barrier material and for use its manufacture steel alloy method

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