JPS59120353A - Heater for molten steel in tundish - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for heating molten steel in a tundish (in continuous casting equipment). This is preferable for preventing nozzle clogging, promoting the floating of inclusions, etc. As a heating source in this case, a plasma torch is advantageous from the viewpoint of molten steel contamination, thermal efficiency, etc. Plasma Ar heating equipment is basically a heating equipment whose one end is immersed in molten steel, and a plasma torch is installed facing the molten steel surface.
The molten steel is heated by generating an arc while supplying the plasma gas to the heating chamber.Plasma gas is generally passed through the molten steel from the lower end of the heating chamber. Because it is designed to be exposed to υ1 air, local damage to the heated Uto end face is severe (good for plasma gas)! -7 Ivory A”>Ivy.

In order to obtain clean steel, it is desirable to form a static region of molten steel and promote floating of minute inclusions. Due to the stirring action of the molten steel caused by this process, a static region of the molten steel is formed, which causes the entrainment of carcasses and impediments to the production of clean steel.

This invention has been made to address the above points, and the plasma gas supplied into the heating chamber is exhausted from the heating chamber.
The above-mentioned problems of the prior art are conveniently solved by arranging the process to be carried out from above the molten steel surface.

2- Details of embodiments of the present invention will be explained below based on FIG. 1.

FIG. 1 shows a shielded tundish in which the tundish is provided with a lid.

In the figure, A shows a ladle, B shows a shield tundish, and C shows a plasma arc heating device.

; 3 is a tan tissue container with M4 size; insert the J puff nozzle 2 set at the bottom of the sushi-ining nozzle device 1 into the hole 5 of the lid 4, and the molten steel will flow into the tan tissue.
charged. Further, this hole 5 is provided with a seal using a heat-resistant bellows 10 or the like. 9 is the immersion nozzle (
The opening/closing stopper (not shown) is -, and the hole 8 is also 4.
A seal using a thermal bellows 10 or the like is provided.

Note that the lid 4 is appropriately provided with a peep hole 6, a preheating hole 7, etc. Reference numeral 12 denotes a heating chamber 12 of a plasma arc heating device C, which has a front wall 13 and a rear wall 13', and its F end is immersed in level 14 soil of molten steel.

Reference numeral 15 denotes a plasma torch that is installed on the top wall of the heating chamber C and is directed toward the molten steel surface, and is supplied with plasma gas (Ar) and is provided with cooling means by an appropriate method. Reference numerals 3 and 17 indicate power feeding electrodes (anodes) 1 to 1. Note that J6 indicates a slotted weir.

In such a configuration, in this invention, <molten steel level>=1-. ．． ．． ) 2, the front and rear walls 13 and 1
:A suitable number of exhaust cars fl-18 are installed on one side of the 3'l oak and on the V side. 41 air is released from the small hole 18, and there is no intrusion into the molten steel, and there is no stirring of the molten steel by the plasma gas, and there is no cutting of the lower ends of the front and rear walls by the plasma gas, and local damage can be avoided. As a result, a long-life heating chamber 12 can be obtained.

(i) The configuration is particularly effective in the following cases, and its contents will be explained in detail. 3 In Fig. 1, (al is the molten steel charging area, (1)) is the heating area, (C1 is the static area, and (di is the injection area.) In these area configurations, the heating area (1) 4- Plasma heating device C of the present invention is installed in ), and after selectively heating the low temperature part of the molten steel supplied to this part to increase the temperature,
As mentioned above, the plasma gas (Ar) supplied into the heating chamber 12 flows into the static region (C1), but since the plasma gas (Ar) supplied to the heating chamber 12 is nF from the U1 pore j8 of the molten steel level 14 soil, the molten steel is stirred by the plasma gas. There is no action at all, and a complete static zone fc) is formed, which, combined with the rise in temperature of the molten steel, effectively floats away minute inclusions, and makes it easy to obtain clean steel.

As described above, according to the present invention, it is possible to effectively heat the molten steel in the tundish, and this invention greatly facilitates continuous casting operation.

[Brief explanation of drawings]

FIG. 1 is an explanatory overall sectional view showing an embodiment of the present invention. A...Ladle'B...Rail tray C...Plasma arc heating device 12...Heating device 13.13'...Front and rear walls 5- J5...Plasma torch 18...Exhaust hole 6
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Claims (1)

[Claims] In addition to the heating chamber having an AfJ rear wall whose lower end is immersed in the molten steel, the heating chamber is equipped with a plus plate facing the molten steel on the 111 wall of the heating chamber. A heating device for molten steel in a tundish, characterized by having one pore of plasma gas glue provided in one or both of the molten steel immersion parts -1-.