JPS5947053A - Nozzle for continuous casting - Google Patents

Abstract

PURPOSE:To provide a titled nozzle which can supply a gas for forming a gaseous seal on the inside wall of a nozzle without variance by communicating an annular chamber for equalizing gaseous pressure which is formed in a nozzle body and communicates with the outside through plural small holes with the inside wall of the nozzle. CONSTITUTION:A chamber 11 for equalizing gaseous pressure which communicates with the outside through a gas introducing hole 12 is formed annularly in a nozzle body 10 of a nozzle for continuous casting, and the chamber 11 is communicated with the inside wall surface of the nozzle through plural communication holes 14 having the area corresponding to a circular hole of <=1.0mm. diameter, whereby the gas in the amt. required for forming a gaseous seal on the inside wall surface of the nozzle is supplied to the inside wall surface of the nozzle without variance. The diameter of the holes 14 is made preferably 0.5-0.03mm. with the consideration for the intrusion of the molten steel. It is possible to manufacture the body 10 of a material having <=20% porosity and >=50% open pores of <=5mu pore diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fishing nozzle for casting molten metal, particularly in continuous casting, in which the molten metal ffj<
Continuous nozzle used for air oxidation prevention and 1X1 grading of molten steel flow.

Conventionally, this glaze continuous candy making nozzle was used outside? (1) A gas blowing type series in which a gas is blown into the nozzle by blowing the nozzle body and forming a gas seal on the inner wall surface of the nozzle to prevent the nozzle from becoming clogged with dust.) ,
Amusement nozzles are known. These gas-blown continuous casting nozzles are made of hard materials such as paper, polypropylene, nylon, paraffin, etc. that disappear during the firing process of nozzle manufacturing.
! At the time of molding, the first object is placed in a fixed position inside the nozzle body, and the first,
2. Create a gap as shown in 1, and fill this gap with gas.
The gas uniformity 11-1 chamber 2 is connected to the outside of the nozzle body 1 through the manhole 6, and is connected to an inert gas supply source (on the It side, The inner surface of the nozzle body 1 is passed through the open pores, and the nozzle inner wall surface and IF# 6H are connected to each other.
1,7 so that an inert gas is inserted between them.

However, in such a nozzle, open pores that communicate the gas equalization chamber 2 and the inner surface of the nozzle are naturally generated during nozzle manufacture.
b,! The presence of open pores varied due to the bonding during manufacturing, and there was a problem that the amount of gas supplied to the inside of the nozzle remained constant.

In particular, when 50% or more of open pores have a diameter of 5 μm or less, it becomes difficult to blow gas into the material, making it impossible to achieve a complete gas seal.

This invention was made to eliminate the drawbacks seen in conventional continuous casting nozzles for gas injection, and by communicating the gas pressure equalization chamber and the inner surface of the nozzle, the necessary gas boiling can be achieved. 11 (4'!rm) means that 11 (11 mm) can be supplied uniformly to the inner wall surface of the nozzle.

A detailed explanation will be given below with reference to the drawings.

Referring to FIGS. 3 and 4, 10 is a nozzle body.

Reference numeral 11 denotes a gas pressure equalizing chamber disposed at a suitable location within the nozzle body, which has a slit-shaped nitrogen gap. 12 is the gas yunzhuangkui 11? r' A gas introduction hole formed in the nozzle body 10 to be in contact with an inert gas supply source, located outside the nozzle, and 16): t, a slag line portion. Reference numeral 14 indicates offshore trace holes that communicate the front nL1 gas uniform river bank 11 with the inner wall surface of the nozzle body 10, and are formed at intervals of 1 uJ, which is an appropriate number of a, in the longitudinal direction and the σ1 radial direction of the nozzle body 10.

The communication hole 14 has an inner diameter of 1.0M or less, and considering the penetration of R1 steel into the communication hole 14 when a lamp or inert gas is not blown, the diameter is 0.5 to 0.
The diameter of ii'4 of 03 butt hI is 100. The 1st rinn shape of the 7th hole 14 in the j is the nozzle no. 1:'i ”A'j
, above defect Lf 'i '6) 11 From the viewpoint of sl>, the internal shape is ft', 3rA, but of course it is not limited to tt, 1iiJ I+,:
J method m J, surface fi corresponding to a circle of diameter 1 in pronation
It may have any shape as long as it is i. In addition, it is generally known that the nozzle is compatible primarily with natural graphite and various drawn aluminas, such as sintered alumina, <!-aluminum, β-aluminum, etc.).
I-Al Mizuno J: I Comprises of carbon 10 (A-light, sillimanite, etc.), and has a chemical composition of carbon 10.
40% to alumina, 80% to alumina 4(), 20% silica etc.
In the following, the present invention is particularly effective for materials for the nozzle body in which synthetic resin bond is used for bonding.

Next, a preferred embodiment of the invention will be described.

Table 1 Nozzle with conventional structure Diameter of nozzle communication hole of the present invention
Pear 200μ shape
Shape in Figure ln1 Shape Il in Figure 3, ``Table 2 Nozzle of conventional structure Diameter of nozzle communication hole of the present invention
Pear 100μ shape
Shape in Figure 2 Shape in Figure 4 Ventilation brother (A/min, IKy pressure > 3.2
9. (i Embodiment 1 Table 1p dead nozzle is connected to main net 250t.

SoA -AIo, 070% A/, -K I IJe
When used simultaneously on TL steel, the immersion nozzle of the present invention was able to completely inject 8 sweetfish for 1 minute without any AJ203AJ adhesion, whereas the nozzle with the conventional structure could inject AA203 in a C5 pot. Inside the nozzle 1~? This confirms the remarkable effect of the Nos./l of the present invention, which adheres to the fc and makes it impossible to cast.

Example 2 The immersion nozzle on table 2 was connected to the main pot 30 (l t, 8o4
- An O, 05% Aj'-Ki, /j! The nozzle of the present invention was used at the same time as the introduction.

With Ale 203, there was no leakage at all and it was possible to completely inject 7 pots, whereas with the conventional nozzle structure, AA2 was injected for 4 pots.
03 stuck to the inner wall of the nozzle, resulting in a lack of casting thread.

The major effect of the nozzle of the present invention is 6.

As described above, the invention's immersion nozzle has the advantage of being able to perform multiple continuous castings without causing nozzle clogging compared to conventional immersion nozzles.・It became.

[Brief explanation of drawings]

Figure 1.2 is the conventional 4? , α cross-section ′ that accepts the i-shaped nozzle
3 and 4 are longitudinal sectional views of the nozzle according to the present invention. 10... Nozzle body 11... Gas pressure equalization chamber 12...
・Gas 41 manhole 16...Slag line part 14・
...59 through hole special ■' [Applicant Akechiji 1 fire brick J1. Termination Association T + Agent Patent Attorney Ito Takeuchi, Part I
K-phrase 1 2nd! ”:i 31st river
No. 41″27

Claims (3)

[Claims] (1) A continuous casting nozzle characterized by having a gas pressure equalization chamber in the nozzle body that communicates with the outside. (2) The continuous casting nozzle according to claim 1, wherein the nozzle body has a porosity of 20 or less and contains 50 or more open pores with a pore diameter of 5 μ or less. (3) 'nF characterized in that the diameter of the communicating hole 16 has an area equivalent to a circular hole of 0.5 to 0.03 mm.
A continuous gate making nozzle according to claim 1 or 2.