JPS6146229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molded copper plate for continuous casting equipment.

The life of a molded copper plate in continuous casting equipment is influenced by various factors, but in particular the life of the lower part of the copper plate is mainly controlled by wear caused by contact with the solidified slab shell. As shown in Fig. 1, this wear 1 occurs over the surface of the molded copper plate 2 on the molten steel side, but the amount of wear increases at the bottom, and as it approaches the bottom, the amount of wear increases by about three times. It increases rapidly and wears out in a tapered shape. In addition, in the figure, 3 indicates a slab and 4 indicates a solidified shell. By the way, the present inventors have already proposed a method in which a ceramic plate is bonded to the lower part of the copper plate in order to cope with the wear at the lower part of the copper plate, but as mentioned above, this product is not effective against tapered wear. It had drawbacks that were difficult to deal with.

Therefore, the present invention provides a molded copper plate for continuous casting equipment that can eliminate the above-mentioned drawbacks.

That is, the present invention vertically joins a plurality of silicon carbide ceramic plates by an active metal method using titanium with their end surfaces in contact with the lower surface of the molten steel side of a molded copper plate, and also connects the upper and lower silicon carbide ceramic plates to each other by an active metal method using titanium. The plate thickness ratio is in the range of 1:3 to 5, and the plate thickness is gradually increased from the upper to the lower.

Here, the reason why the thickness of the ceramic plate is gradually increased in the range of 1:3 to 5 from the upper side to the lower side will be explained. As mentioned above, the amount of wear on the molded copper plate itself changes at a ratio of 1:3, but when ceramic plates of a constant thickness are joined, the temperature of the copper plate becomes uniform because the thermal conductivity of the ceramic plate is low. It was found that the value increases in the direction of As a result, compared to the wear ratio of 1:3 when only the molded copper plate is used, the thickness of the ceramic plate is 1:3 to 1:3 from the top to the bottom.
It was found that 5 times is desirable. That is, unless the thickness of the lower ceramic plate is at least three times the thickness of the upper ceramic plate, the lower ceramic plate will become unusable before the damage to the upper ceramic plate reaches its limit. In addition, the above plate thickness ratio is 5
If it exceeds twice that, the upper ceramic plate will be damaged before the lower ceramic plate will reach its usable limit, and the molded copper plate as a whole will no longer function.

Next, a specific example will be explained.

As shown in the side view of FIG. 2, which shows an embodiment of the present invention, a silicon carbide ceramic plate 11 is placed on about the lower half of a molded copper plate 12, and titanium is placed on, for example, five silicon carbide ceramic plates 11 so that their upper and lower end surfaces are in contact with each other. The silicon carbide ceramic plate was bonded using the active metal method used, and the thickness of the silicon carbide ceramic plate was 0.07 mm.
mm, the lowest 11b has a plate thickness of 0.28 mm,
During this period, the thickness of the ceramic plate was gradually increased from the top to the bottom, with a thickness difference of about 0.05 mm. When this product was used in actual continuous casting equipment, it was found that it withstood approximately 670 charges of casting, and that the residual thickness of the ceramic plates was the same in all cases, that is, the limit of use was uniformly reached.

As described above, according to the molded copper plate of the continuous casting equipment of the present invention, a plurality of silicon carbide ceramic plates are joined in the vertical direction with their end surfaces in contact with the lower surface on the molten steel side, and the silicon carbide ceramic plates are connected to the upper side of the silicon carbide ceramic plate. The ratio of the lower plate thickness is in the range of 1:3 to 5, and the plate thickness is gradually increased from the upper to the lower part, so the life of each ceramic plate bonded to the lower part of the molded copper plate is uniform throughout. Therefore, it is economical.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing wear of a molded copper plate, and FIG. 2 is a side view of a molded copper plate showing an embodiment of the present invention. 2... Molded copper plate, 3... Cast piece, 11... Silicon carbide ceramic plate, 12... Molded copper plate.

Claims (1)

[Claims] 1. Joining a plurality of silicon carbide ceramic plates in the vertical direction with their end surfaces in contact with the lower surface of the molten steel side,
A molded copper plate for continuous casting equipment, characterized in that the ratio of the upper and lower plate thicknesses of the silicon carbide ceramic plate is in the range of 1:3 to 5, and the plate thickness is gradually increased from the upper side to the lower side.