KR20110108975A - Ladle of steel making - Google Patents

Ladle of steel making Download PDF

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Publication number
KR20110108975A
KR20110108975A KR1020100028500A KR20100028500A KR20110108975A KR 20110108975 A KR20110108975 A KR 20110108975A KR 1020100028500 A KR1020100028500 A KR 1020100028500A KR 20100028500 A KR20100028500 A KR 20100028500A KR 20110108975 A KR20110108975 A KR 20110108975A
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KR
South Korea
Prior art keywords
ladle
refractory
zrb
steelmaking
comparative example
Prior art date
Application number
KR1020100028500A
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Korean (ko)
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KR101246495B1 (en
Inventor
기웅간
정권희
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현대제철 주식회사
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Priority to KR1020100028500A priority Critical patent/KR101246495B1/en
Publication of KR20110108975A publication Critical patent/KR20110108975A/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
    • 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
    • B22D41/14—Closures
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B22D41/46—Refractory plugging masses
    • 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

Abstract

The present invention relates to a steel ladle, comprising a refractory shock pad made of Al 2 O 3 -C-ZrB 2- based material refractory, and disposed in the lower end of the inner wall of the steel ladle that is a local erosion. Therefore, the present invention has improved effect of corrosion resistance and thermal shock resistance of steelmaking ladle, thereby reducing local erosion generated during the shifting of the converter and reducing the repair cycle, thereby reducing the unit of refractory and improving productivity.

Description

Ladle of steel making

The present invention relates to a steel ladle, and more particularly, to a steel ladle whose structure is improved to minimize local erosion of the bottom portion generated during molten steel tapping.

In general, steel mills manufacture molten steel by melting scrap iron or pig iron in a steelmaking furnace and then adding necessary alloying elements.

Subsequently, the molten steel which is finished in the steelmaking furnace is transferred to the steel ladle for secondary refining or casting. As such, steelmaking ladles are essential equipment for subsequent work in the steelmaking process.

These steelmaking ladles are typically constructed by refractories to withstand the high temperatures of molten steel received inside the body enclosed by a steel bar.

An object of the present invention is to provide a steel ladle whose structure is improved to prevent local erosion of the steel ladle bottom generated during the tapping of molten steel to improve the steel ladle life.

According to a feature of the present invention for achieving the above object, the present invention is made of a refractory Al 2 O 3 -C-ZrB 2- based material, and a refractory shock pad disposed on the lower end of the inner wall of the steel ladle that is a local erosion site It includes.

The Al 2 O 3 -C-ZrB 2 based material refractory has a composition of Al 2 O 3 : 80 ~ 90wt%, C: 4 ~ 10wt%, ZrB 2 : 1 ~ 5wt% and other unavoidable impurities.

The Al 2 O 3 -C-ZrB 2 material refractory further includes a binder.

The binder is a high xanthan organic binder.

The refractory shock pad is formed with an inclined surface on one side facing the inner surface of the steel ladle.

The present invention is to attach a refractory shock pad having a composition of Al 2 O 3 : 80 ~ 90wt%, C: 4 ~ 10wt%, ZrB 2 : 1 ~ 5wt% and other unavoidable impurities to the lower end of the inner wall of the steel ladle as a local erosion site Improves corrosion resistance and heat shock resistance of steelmaking ladle.

Therefore, the local erosion of the steelmaking ladle generated during the transfer of the converter is reduced and the repair cycle is reduced, thereby reducing the unit of refractory and improving productivity.

1 is a side cross-sectional view showing a preferred embodiment of the steelmaking ladle according to the present invention.
Figure 2 is a plan view showing a preferred embodiment of the steelmaking ladle according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The steelmaking ladle of the present invention attaches a refractory shock pad 11 made of Al 2 O 3 -C-ZrB 2 -based refractory material to a lower portion of the inner wall, which is a local erosion site. An example of the local erosion site is indicated by the symbol A in FIG. 1.

In the converter tapping operation, in order to prevent the inflow of slag into the steelmaking ladle 10, the tapping to the lower end of the inner wall of the steelmaking ladle 10, which causes local erosion due to physical impact on the bottom of the steelmaking ladle 10 A) occurs and the refractory life is shortened.

In order to prevent such local erosion, a refractory shock pad 11 having excellent corrosion resistance and thermal shock resistance of molten steel is installed at the lower end of the inner wall of the steel ladle which is a local erosion site.

Of course, the bottom center of severe damage of the steelmaking ladle 10 increases the refractory construction thickness to improve the service life of the steelmaking ladle. In this case, the bottom center erosion of the steelmaking ladle 10 and the local erosion due to converter tapping are reduced, thereby reducing the repair cycle of the steelmaking ladle 10. Reducing the repair cycle of steelmaking ladles has the effect of reducing the refractory unit and increasing productivity.

Specifically, the refractory shock pad 11 is Al 2 O 3 -C-ZrB 2- based refractory material Al 2 O 3 : 80 ~ 90wt%, C: 4 ~ 10wt%, ZrB 2 : 1 ~ 5wt% and other unavoidable It has a composition of impurities.

Alumina (Al 2 O 3 ) is to improve the corrosion resistance of the molten steel, the thermal shock resistance, the bonding strength with the steelmaking ladle. If Al 2 O 3 is less than 80wt%, the corrosion resistance and thermal shock resistance is low, and the bonding strength with the steelmaking ladle is also low. On the other hand, if the content exceeds 90wt%, the content of C or ZrB 2 is relatively low, and the effect of improving thermal shock resistance is insufficient.

Carbon (C, Carbon) is a component having low thermal expansion coefficient and no crystal change, and is added to improve the thermal shock resistance of a refractory shock pad. If C is less than 4wt%, its effect is insignificant, and if it is more than 10wt%, corrosion resistance is lowered by the loss of the matrix part (Al 2 O 3 ) by C oxidation.

Zirconium diboride (ZrB 2 ) C Used to improve the bond between oxidation and steel ladle. Improved mechanism as ZrB 2 is oxidized at a high temperature oxidizing atmosphere, and thereby produce a ZrO 2 ZrB 2 oxide on the surface of the raw material, wherein the resulting ZrO 2 is Prevents C oxidation and improves bonding to steelmaking ladles. If the amount of ZrB 2 is less than 1 wt%, the effect is insignificant. If the amount of ZrB 2 is more than 5 wt%, thermal shock resistance is lowered due to ZrB 2 peroxidation.

The refractory to Al 2 O 3 -C-ZrB 2 material further includes a binder. The binder uses a high xanthan organic binder to improve the corrosion resistance of molten steel. The high xanthan organic binder is effective in increasing the bonding strength of Al 2 O 3 -C-ZrB 2 based refractory materials.

The high xanthan organic binder means an organic binder having xanthan of 30 wt% or more.

The high xantane organic binder may be a polymer compound such as a phenol resin or a pitch, and the high xanthan organic binder may have an organic component removed by applying heat of 500 ° C. or higher, and only carbon (C) remains. This carbon component increases the binding force of the refractory shock pad. High bonding forces increase the erosion resistance of the refractory shock pads.

The high xanthan organic binder has a low binding strength of Al 2 O 3 -C-ZrB 2 based refractory material when xanthan is less than 30 wt%. The content of the high xanthan organic binder is not particularly limited, but 1 to 5 wt% is appropriate for 100 wt% of Al 2 O 3 -C-ZrB 2 based refractory materials in consideration of viscosity and the like.

The refractory shock pad 11 formed of the above-described components has a shape corresponding to the lower end of the inner wall of the steelmaking ladle 10, and an inclined surface is formed at one side facing the inner surface of the steelmaking ladle 10. The inclined surface is designed to alleviate the impact when the converter descends and has an inclination of 15 to 45 °.

The refractory shock pad 11 can be installed in the form of irregular refractory or fixed refractory according to the working environment. And, the thickness of the refractory shock pad can be changed according to the working conditions.

Hereinafter, steelmaking ladles will be described with reference to invention examples and comparative examples to help understand the present invention.

Table 1 below shows the invention examples and comparative examples of each component element is different. Table 1 is an experiment to calculate the appropriate compounding ratio for improving the performance of the refractory shock pad.

division
Ingredient
(wt%) Evaluation index Al 2 O 3 Carbon ZrB 2 MgO bookbinder Molten steel
Corrosion resistance Heat resistant
Impact With ladle
cohesion Comparative Example 1 89 - - 7 4 100 100 100 Comparative Example 2 70 20 5 - 5 80 150 120 Comparative Example 3 70 10 15 - 5 90 110 130 Comparative Example 4 70 5 20 - 5 100 90 90 Inventive Example 1 80 10 5 - 5 130 140 150 Comparative Example 5 80 5 10 - 5 120 90 200 Comparative Example 6 80 One 14 - 5 100 80 90 Inventive Example 2 90 4 One - 5 130 105 105 Comparative Example 7 90 One 4 - 5 100 100 120

[Evaluation index is relative to 100 of Comparative Example 1]

Comparative Example 1

In Comparative Example 1, a high alumina refractory having an Al 2 O 3 content of about 90 wt% or more was used at a site where local erosion occurred when the converter went down. In the case of high alumina refractories with an Al 2 O 3 content of about 90wt% or more, the effect of reducing local erosion was not significant.

Comparative Example 2

In Comparative Example 2, a refractory shock pad having Al 2 O 3 : 70 wt%, C: 20 wt%, and ZrB 2 : 5 wt% was used as a site where local erosion occurred when the converter went down. In this case, the thermal shock resistance and the bonding strength with the steel ladle were improved compared to Comparative Example 1, but the molten steel corrosion resistance was decreased due to the low Al 2 O 3 content.

Comparative Example 3

In Comparative Example 3, a refractory shock pad having Al 2 O 3 : 70 wt%, C: 10 wt%, and ZrB 2 : 15 wt% was used as a site where local erosion occurred when the converter went down. In this case, as in Comparative Example 2, compared with Comparative Example 1, the thermal shock resistance and the bonding strength with the steel ladle are improved, but the molten steel erosion resistance was decreased due to the low Al 2 O 3 content.

<Comparative Example 4>

In Comparative Example 4, a refractory shock pad having Al 2 O 3 : 70 wt%, C: 5 wt%, and ZrB 2 : 20 wt% was used as a site where local erosion occurred when the converter went down. In this case by ZrB 2 peroxidation The impact resistance to heat and steel ladle have also been reduced.

Invention Example 1

Inventive Example 1 used a refractory shock pad having Al 2 O 3 : 80wt%, C: 10wt%, ZrB 2 : 5wt% at the site where local erosion occurs when the converter is going out. In this case, the molten steel erosion resistance, thermal shock resistance, and the bond with the ladle were all improved.

Comparative Example 5

In Comparative Example 5, a refractory shock pad having Al 2 O 3 : 80 wt%, C: 5 wt%, and ZrB 2 : 10 wt% was used as a site where local erosion occurred when the converter went down. In this case by ZrB 2 peroxidation Thermal shock resistance was inferior.

Comparative Example 6

In Comparative Example 6, a refractory shock pad having Al 2 O 3 : 80 wt%, C: 1 wt%, and ZrB 2 : 14 wt% was used as a site where local erosion occurred when the converter went down. In this case, due to the lack of C content and ZrB 2 peroxidation, molten steel was inadequate in corrosion resistance, thermal shock resistance, and binding force with ladle.

Invention Example 2

Inventive Example 2 uses a refractory shock pad having Al 2 O 3 : 90wt%, C: 4wt%, ZrB 2 : 1wt% at the site where local erosion occurs when the converter is going out. In this case, the thermal shock resistance and the bond strength with the ladle is somewhat lower than the invention example 1, but the molten steel erosion resistance, the thermal shock resistance, and the bonding force with the ladle are all improved compared with Comparative Example 1.

&Lt; Comparative Example 7 &

In Comparative Example 7, a refractory shock pad having Al 2 O 3 : 90 wt%, C: 1 wt%, and ZrB 2 : 4 wt% was used at the site where local erosion occurred when the converter went down. In this case, compared with the comparative example 1, molten steel corrosion resistance did not improve. This is due to the lack of C content does not appear to improve the corrosion resistance.

According to the experimental results of Table 1, the erosion resistance and thermal shock resistance of the molten steel was the best when using a refractory shock pad having Al 2 O 3 : 80wt%, C: 10wt%, ZrB 2 : 5wt%, C content 10wt When the percentage was exceeded, the erosion resistance was lowered. When the ZrB 2 content was more than 5 wt%, the thermal shock resistance was lowered.

Through this, a refractory shock pad having a composition of Al 2 O 3 : 80 to 90 wt%, C: 4 to 10 wt%, ZrB 2 : 1 to 5 wt%, and other unavoidable impurities may be attached to the bottom of the inner wall of the steel ladle which is a local erosion site. In this case, it can be seen that the corrosion resistance and thermal shock resistance of the steelmaking ladle can be improved.

Within the scope of the basic technical idea of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

10: steel ladle 11: refractory shock pad
A: local erosion site

Claims (5)

Made of refractory material of Al 2 O 3 -C-ZrB 2
Steelmaking ladle comprising a refractory shock pad disposed in the lower end of the inner wall of the steelmaking ladle that is a local erosion. The method according to claim 1,
The Al 2 O 3 -C-ZrB 2- based refractory material is characterized in that the steel has a composition of Al 2 O 3 : 80 ~ 90wt%, C: 4 ~ 10wt%, ZrB 2 : 1 ~ 5wt% and other unavoidable impurities Ladle. The method according to claim 1 or 2,
The steel refractories of the Al 2 O 3 -C-ZrB 2 material further comprises a binder. The method according to claim 3,
The binder is a steelmaking ladle, characterized in that the high xanthan organic binder. The method according to claim 1,
The refractory shock pad is steelmaking ladle, characterized in that the inclined surface is formed on one side facing the inner surface of the steelmaking ladle.
KR1020100028500A 2010-03-30 2010-03-30 Ladle of steel making KR101246495B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102407559A (en) * 2011-11-15 2012-04-11 赵素志 Method for pouring working lining of half steel ladle
KR101382648B1 (en) * 2012-06-05 2014-04-10 재단법인 포항산업과학연구원 Stopper refractory for continuous casting and manufacturing method thereof using the same
CN108097941A (en) * 2017-11-23 2018-06-01 南京钢铁股份有限公司 A kind of ladle and its building method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6074839U (en) * 1983-10-26 1985-05-25 大同特殊鋼株式会社 ladle
JPH02165863A (en) * 1988-12-15 1990-06-26 Sumitomo Metal Ind Ltd Lining structure for bottom of ladle of false bottom type
JP2001353561A (en) * 2001-11-29 2001-12-25 Shinagawa Refract Co Ltd Method for continuously casting steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102407559A (en) * 2011-11-15 2012-04-11 赵素志 Method for pouring working lining of half steel ladle
CN102407559B (en) * 2011-11-15 2013-07-24 赵素志 Method for pouring working lining of half steel ladle
KR101382648B1 (en) * 2012-06-05 2014-04-10 재단법인 포항산업과학연구원 Stopper refractory for continuous casting and manufacturing method thereof using the same
CN108097941A (en) * 2017-11-23 2018-06-01 南京钢铁股份有限公司 A kind of ladle and its building method
CN108097941B (en) * 2017-11-23 2019-10-25 南京钢铁股份有限公司 A kind of ladle and its building method

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