JPS637419Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to the structure of bricks for checking the extent of remaining bricks for ladle lining. [Prior art] In recent years, the conditions for using refractories for ladle have become increasingly severe due to the increase in continuous casting ratio and special refining treatment, etc., and the evaluation of lining corrosion damage has become more accurate than before. requested. However, at present, the main method is to visually observe the residual material in cold conditions during routine repairs, and it is nearly impossible to confirm the residual state due to melting damage through visual observation in the hot state during continuous operation. Normally, ladle linings are made of waxite, zircon, cell zircon, high alumina, as shown in Table 1, and basic refractories such as magnesia, maguro, and chromamag. These are appropriately combined to determine melting loss based on the difference in brightness. However, the thermal conductivity of these bricks is
As shown in Table 1, 1.0-3.0Kcal/m, hr, °C
(below 1400°C), and apart from abnormal melting due to contact reactions, it is extremely difficult to accurately judge the exposure of bricks for melting due to differences in brightness, no matter which combination is used. In addition, slag and base metal adhere to the working surface of these bricks, making it even more difficult to judge. [Purpose of the invention] The purpose of the invention is to provide bricks for use in determining melt damage that have high thermal conductivity and are difficult to attract slag or base metal, thereby making it possible to clearly determine melt damage of lining bricks. The purpose of the present invention is to provide a brick for use in determining corrosion damage. [Structure of the invention] The ladle lining remaining confirmation brick of the present invention has a thermal conductivity of 1 to 3 Kcal/m, hr, °C on at least a part of one side of the brick, in order to clearly compare the brightness. It is made by integrally molding and embedding a carbon-containing refractory material having a temperature of 5 to 30 Kcal/m, hr, °C, or it is pasted together after molding using mortar or the like. The carbon content must be between 5 and 40% by weight, and if it is less than 5% by weight, it is difficult to compare the brightness.
If it exceeds 40% by weight, it is unfavorable in terms of oxidation of the back side of the brick, molding of the brick, and cost. Next, the present invention will be explained in detail with reference to examples. [Example] A ladle lining residual confirmation brick according to the present invention was created by combining a carbon-containing refractory with a zircon refractory among the refractories used for ladle lining bricks shown in Table 1. Figures 1 to 4 show examples of the structure of the brick, in which a carbon-containing refractory 2 shown in each example in Table 2 is integrally molded on one side of a zircon brick 1. It is. Table 2 shows the formulation composition of the carbon-containing refractories used and the objects after curing of the same formulation. In the same table, the rotary erosion test was conducted in molten steel at 1650℃, and the corrosion rate of the zircon refractory was 20%.
% and indicates the corrosion rate index of each carbon-containing refractory when the index is 100. When these lining residual confirmation bricks were arranged in 3 tiers in 4 places in a 185t ladle with the carbon-containing refractory 2 side facing back and used in the ladle, Example 1 was obtained at the 70th charge.
The carbon-containing refractories are visible and there is no base metal adhesion.
The difference in brightness from zircon brick 1 was clearly confirmed. After that, it was dismantled after using 10 to 20 charges.

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[Effect of idea]

According to the present invention, it is possible to confirm the presence of lining bricks in hot conditions, and there is an advantage that the safety factor of ladle operation can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the brick of the present invention, FIG. 2 is a side view of the same, and FIGS. 3 and 4 are side views of another example. 1... Zircon brick, 2... Carbon-containing refractory.

Claims (1)

[Scope of utility model registration request] Bricks for ladle lining have a thermal conductivity of 1 to 3 Kcal/m, hr, and a brick material with a thermal conductivity of 5 to 30 Kcal/m, 5 to 40% by weight of carbon added to at least a part of one side of the brick material. A ladle lining residual confirmation brick characterized by being integrally made of a carbon-containing refractory of hr, °C.