JPS62144852A - Runner for bottom pouring ingot making - Google Patents

Abstract

PURPOSE:To prevent a contamination of molten steel and to obtain a high quality steel ingot by forming a runner by a cast iron casting for a bottom pouring ingot making, which molten steel is supplied into a ingot making mold by the bottom pouring. CONSTITUTION:A cast iron block 4 for forming runner is a block to form the runner connected with a pouring tube 2 and the ingot making mold 3. Therefore, as the runner, which supplies the molten steel from the pouring tube 2 to the ingot making mold 3, is not formed of refractory, the molten steel is not contaminated caused by erosion of refractory and not afraid of generating any refractory scum, and then the ingot having high quality is obtd.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is applicable to supplying molten steel into an ingot mold by under-pouring and manufacturing a steel ingot within the ingot mold. This relates to the structure of the runner for under-pouring ingots.

(Prior art) Molten steel casting methods can be broadly classified into X!, which continuously produces slabs. There are two continuous casting methods and a mold ingot making method in which molten steel is supplied into an ingot making mold to produce a steel ingot for each ingot making mold.

Also in this mold ingot making method, the molten steel is made into an ingot P! There are two methods: a top-pouring ingot-making method in which molten steel is supplied from the upper part of the mold, and a bottom-pouring ingot-making method in which molten steel is supplied from the lower part of the ingot-making mold, each of which has its advantages and disadvantages.

(Problems to be solved by the invention) As mentioned above, mold ingot making methods include top pour ingot making method and bottom pour ingot making method. Of these, in top pour ingot making method, molten steel is There is a problem in that splash occurs continuously on the lower part of the inner wall surface of the ingot forming mold at the initial stage of pouring, which may cause double skin on the surface of the steel ingot. On the contrary,
In the bottom pouring ingot making method, although there is no problem due to the above-mentioned splash, molten metal is poured into ingots through a runner formed with refractory bricks in a surface plate where an ingot mold is installed. Since the molten steel is fed from the bottom of the mold, there is a problem in that the molten steel passing through the runners is contaminated by the refractory bricks that form the runners, which can cause brick defects in the steel ingot.

This invention was made by focusing on these conventional problems, and it prevents contamination of molten steel by conventional refractory bricks even when manufacturing steel ingots by the bottom pouring method, and improves high quality. The purpose is to make it possible to obtain high quality steel ingots.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a bottom-pouring ingot-making runner for supplying molten steel into an ingot-making mold by bottom pouring, in which the runner is formed of cast iron. It is characterized by the fact that

(Embodiment) Figures 1 to 4 are diagrams showing an embodiment of the present invention, and in Figure 1, 1 is a surface plate, 2 is an injection pipe installed on the surface plate 1, and 3 is the same. An ingot mold installed on surface plate 1,
Reference numeral 4 denotes a cast iron block for forming a runner for connecting the injection pipe 2 and the ingot forming mold 3. In this case, the injection pipe 2 and the ingot mold 3 are arranged on the surface plate 1 in a so-called skewer-shaped arrangement or in a radial arrangement, and the invention is not particularly limited to these arrangements. It is something.

The cast iron block 4 for forming runners described above is shown in FIG. 2(a) (
As shown in b), it has a rectangular cross section, a perfectly circular (but not limited to) runner 5 at its central neck, and a fitting projection 4a on one end surface. It also has a fitting recess 4b on the other end surface, and by connecting a plurality of runner-forming cast iron blocks 4, a runner 5 of a required length can be formed.

Although the sullate-shaped cast iron block 4 for forming runners is explained in FIGS. 2(a) and 2(b), the block 4 for forming runners with a rising shape as shown in FIG. A cast iron block 4, a cast iron block //4 for forming a runner with one end closed as shown in FIG. It is adopted as necessary to form a runner. Therefore, since the runner 5 that supplies molten steel from the injection pipe 2 to the ingot mold 3 is not made of refractory bricks, there is no contamination of the molten steel due to erosion of the refractory bricks, so there is no risk of brick defects occurring in the steel ingot. It is possible to obtain high quality steel ingots without any problems.

FIGS. 5(a) and 5(b) are views showing another embodiment of the present invention, in which the cast iron block 4 for forming runners is connected to the upper block 4C.
and a lower block 4d, and both blocks 4
c, 4d so that a runner 5 is formed between both blocks 4c.

A high melting point vibro is provided inside so that 4d does not come into direct contact with molten steel. In this case, the materials for the high melting point vibro are soft iron, low carbon steel, ceramic sintered bodies (for example, nitrides such as Si3N4, 5i02.M
Oxide type such as gO.

Carbide-based materials such as SiC) are used.

Even in such a case, it is possible to obtain a high-quality steel ingot without brick defects as in the above embodiment, and it is also possible to obtain a high-quality steel ingot without brick defects.
If the wall surface is damaged, you can simply replace the high melting point vibro in the corresponding part.Furthermore, even when the cast iron block 4 for runner formation is made into split molds (4c, 4d), it will prevent water leakage. Since this does not occur, the cast iron block 4 can be used repeatedly, which has the advantage of significantly reducing operating costs.

In addition, in FIGS. 5(a) and 5(b), the straight cast iron block 4 for forming runners has been explained, but as in the case of the above embodiment, the runners having an upright shape as shown in FIG. It goes without saying that a similar structure in which a high melting point vibro is provided can be adopted for the forming cast iron block 4 or the runner forming cast iron block 4 having a closed end shape as shown in FIG.

"Effects of the Invention" As explained above, according to the present invention, in a bottom pouring ingot making runner that supplies molten steel into an ingot making mold by bottom pouring, the runner has a structure in which the runner is formed of cast iron. Therefore, even when manufacturing steel ingots using the bottom pour ingot method, it is possible to prevent contamination of molten steel by the conventional refractory bricks for forming runners, and the features of the bottom pour ingot method can be prevented. This brings about the very excellent effect of making it possible to obtain high-quality steel ingots.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a bottom pouring agglomeration device equipped with a runner for bottom pouring agglomeration according to an embodiment of the present invention, and FIGS. FIGS. 3 and 4 are side views and vertical cross-sectional views, respectively, of a cast iron block for forming a runner that forms a lump runner; FIGS. Figures (a) and (b) are a side view and a longitudinal cross-sectional view, respectively, of a 9j iron block for forming a runner for forming a runner for under-pouring ingots according to another embodiment of the present invention. 1... Surface plate, 2... Injection pipe, 3... Ingot forming mold, 4... M iron block for runner formation. 5... runner, 6... high melting point pipe. Patent applicant Daido Steel Co., Ltd. Representative Patent Attorney Yutaka Oshio Figure 1

Claims (2)

[Claims] (1) A runner for under-pouring ingot-making which supplies molten steel into an ingot-making mold by under-pouring, characterized in that the runner is formed of cast iron. (2) Claim No. (1) characterized in that the runner formed of cast iron is provided with a high melting point pipe.
A runner for under-pouring ingots as described in section.