JPH0542350A - Method and device for supplying heated mold powder for continuous casting - Google Patents

Abstract

PURPOSE:To provide method and device for supplying heated mold powder for continuous casting, by which the whole powder for supplying into a mold is uniformly and precisely heated to the prescribed temp. in case of necessity at any time and a continuously cast slab can be produced without developing any harmful surface defect and bad working environment due to scattering of the powder and temp. rising at the time of heating is not developed. CONSTITUTION:At the time of charging the powder into the mold 3 for continuous casting, the powder is heated in a pipe 7 on the way of supplying the powder with irradiation of microwave from an irradiating part 11 and also, the heating temp. is made to the temp., by which constituting component and material property of the powder is not changed, and adjusted to the temp. corresponding to stationary and unstationary casting condition in the continuous casting and the heated powder is charged into the mold 3. Then, self-exothermic reaction is executed to the powder particles under carrying with gas stream, and the temp. of powder particles is risen and this powder is supplied, and at the time of unstationary condition, such as start of casting, this is heated at high temp. and at the time of stationary condition, this is heated at low temp., and the development of surface defect on the cast slab due to shortage of melting to the powder, is prevented and this can be immediately adjusted to the optional temp. according to the condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to continuous casting,
The present invention relates to a method and apparatus for heating and supplying a mold powder to be charged into a mold.

[0002]

2. Description of the Related Art Generally, powder and its molten layer in continuous casting of cast slabs are used to prevent oxidation of molten steel, to remove adsorbed inclusions, and to prevent quenching and lubrication by inflow of powder between the mold and the solidified shell. It is essential for imparting sex. On the other hand, however, this powder may cause harmful defects on the surface of the slab. In particular, during so-called unsteady casting, such as during casting start, when changing the tundish, when changing the width during casting, when continuously casting different steel types, etc. Is reduced. As a result, the meltability of the powder deteriorates, and harmful defects such as vertical cracks, slag entrapment, or pinholes are likely to occur on the surface of the slab.

In order to prevent the occurrence of the above-mentioned surface defects of the cast slab, the following techniques have been conventionally disclosed. That is, the viscosity of the powder is optimized so that the powder can be uniformly introduced. A method of reducing the amount of heat removed from molten steel by joining a metal having a low thermal conductivity or forming a groove on the inner surface of a molded copper plate. A method of fluidizing molten steel between the immersion nozzle and the long side of the mold (see Japanese Patent Laid-Open No. 61-172663). For example, a method of raising the temperature of the meniscus portion by an exothermic powder (a powder that generates heat by a thermite reaction when melted on the molten steel in the mold) is used.

Further, as a conventional technique, a preheated powder is used.
There is also known a method or an apparatus for supplying the heat to the mold. For example, Japanese Patent Application Laid-Open No. 57-19142 discloses a method of preheating in a heating furnace as an example, and Japanese Patent Application Laid-Open No. 57-52556. Japanese Unexamined Patent Publication (Kokai) No. 58-48242 discloses a device for preheating by contacting a high temperature gas with the powder. Further, Japanese Utility Model Laid-Open No. 58-47356 discloses an embodiment in which a spring built-in type feeder is electrically heated to indirectly heat the powder. A heating device is shown.

[0005]

However, the above-mentioned prior art has the following problems. That is, although the above methods and (3) show a considerable improvement effect when the casting speed is relatively low, especially at 1.0 m / min or less, when the casting speed is 1.1 m / min or more, the surface defects of the slab are completely eliminated. I couldn't prevent it. Further, the above method is aimed at preventing vertical cracking and increasing the casting speed, but even this method only locally melts the molten steel, sufficient fluidization is difficult to cause surface defects of the slab. It was difficult to prevent it completely.

Also in the above method, the temperature of the meniscus portion rises in the early stage of casting, but since the heat generating powder does not sustain the heat generating effect, a continuous heat retaining effect cannot be obtained.
The effect of improving the surface defects of the slab was small. Further, in the above method, since the heating means is only the heating furnace, it is unlikely that an appropriate powder heating means has been invented by a person skilled in the art.

Further, in the above apparatus, the powder is heated while the preheating high-temperature gas and the powder are transported in a mixed state, and it is necessary to separate them again in the next process.

For example, as disclosed, even if a cyclone or the like is used as a separation device, it is difficult to completely prevent powder particles having a diameter of a micron from escaping to the periphery, and the powder is scattered. There is concern that the work environment may deteriorate due to the above, the temperature of the work environment may rise due to the use of high-temperature gas, and that the device may be complicated and malfunction.

Further, in the above-mentioned apparatus, an indirect heating method from the outside is adopted, but since the powder is originally a mixture of powder and gas, the thermal conductivity of the powder layer is small. Is extremely small, the powder is heated by external heating.
It was difficult to uniformly heat the entire layer to a sufficient temperature.

Further, in the above-mentioned apparatus, since the heat capacity of the apparatus such as the transportation route of the hot gas of the powder or the feeder with the spring is large, it is necessary to preheat the apparatus itself before starting the heating of the mold powder. is there. for that reason,
Since it takes a long time to start up during heating, it is difficult to perform heating up to a predetermined temperature at any time, and it is not easy to accurately adjust the preheating temperature.

The present invention was made in view of the above-mentioned circumstances, and an object thereof is to heat the entire powder to be supplied to a mold evenly and accurately to a predetermined temperature as needed, as needed. A continuous casting slab can be manufactured without supplying harmful surface defects, and a simple apparatus can be provided without scattering of powder due to heating and deterioration of working environment due to temperature rise. It is an object of the present invention to provide a method and apparatus for heating and supplying a mold powder for continuous casting.

[0012]

In order to achieve the above-mentioned object, the powder heating and feeding method according to the present invention is a powder feeding step of feeding the powder into the continuous casting mold. While heating by irradiating microwaves in the tube of, the heating temperature is adjusted to a temperature at which the constituent components and physical properties of the powder do not change, and adjusted to a temperature corresponding to the steady or unsteady casting condition of continuous casting. It is characterized in that a heated powder is put into the mold.

From another aspect, the powder according to the present invention.
The heating and supplying method, when heating the powder according to claim 1, adjusts the heating temperature to a predetermined value by changing the number of heating operations of a plurality of heating units to which microwaves are applied or the output of the microwave oscillating device. It is characterized by doing.

The powder supply apparatus according to the present invention comprises a heating section which is made up of a non-metal tube inserted in the middle of the process of supplying powder to the continuous casting mold and which is irradiated with microwaves. An irradiation unit surrounding the irradiation unit, a microwave oscillating device disposed in the vicinity of the irradiation unit, and a propagation for guiding the microwave to the irradiation unit by connecting the microwave oscillating device and the irradiation unit. It is characterized in that a tube and an isolator inserted in the middle of the propagation tube are provided.

From another aspect, a plurality of the irradiation units and the heating units are arranged. Alternatively,
The structure of the non-metal pipe that constitutes the heating unit is a double pipe.

From another aspect, the material of the non-metal tube forming the heating section is quartz glass, silicon nitride, or a ceramic mainly composed of alumina.

[0017]

The operation of the method of the present invention will be described below.

During continuous casting of molten steel, for example, when the casting is started, when changing the tundish, when changing the width during casting, when continuously casting different steel types, etc., the casting speed generally decreases and the molten steel temperature decreases. Falls, the casting operation becomes an unsteady state, and the steady state is reached through this unsteady state.
Powder to be supplied to the mold during such continuous casting
Is heated and supplied in a temperature range in which its chemical composition is not adversely affected. The heating temperature may be constant at a proper temperature, or may be heated to a higher temperature in the unsteady state than in the steady state and supplied, or may be heated and supplied only in the unsteady state. Good.

When the powder which is heated to the predetermined temperature at any time is supplied and cast, the meltability of the powder is reduced even if the casting speed is lowered and the molten steel temperature is lowered as in the unsteady state. A powder having high fluidity without being impaired enters the gap between the solidified shell and the mold and uniformly lubricates each portion of the gap. For this reason, the heat removal by the mold of the solidified shell becomes uniform, and the cast piece can form a uniform solidified shell, so that an excellent steel slab with few surface defects can be manufactured.

In this case, as the powder, any chemical composition can be used, and the temperature range in which the constituents and physical properties of the powder do not change during heating, that is, carbon in the powder is removed. It is desirable to set the heating temperature within the range of the upper limit temperature at which charcoal does not disappear or the sintering reaction does not occur, and heating is usually performed at about 100 to 600 ° C. The reason is that if the temperature is less than 100 ° C, the heating effect is small,
Above 600 ° C, depending on the type of powder, powder
This is because the components of the powder may deteriorate or the particles of the powder may melt with each other to form a lump, which may impair the function of the powder in the mold.

In order to carry out the heating suitable for surely realizing the above-mentioned operation, the heating and supplying method of the mold powder according to the present invention heats by irradiating with microwaves in the tube during the powder supplying process. At the same time, the heating temperature is set to a temperature at which the constituents and physical properties of the powder do not change, and the heating temperature is adjusted to a predetermined temperature corresponding to the steady or unsteady casting condition of continuous casting, and the heated powder is in the mold. Throw in.

By the way, it is known that the electric power P that is absorbed by the object to be heated and converted into heat is related to the physical properties of the object to be heated, the strength and frequency of the applied electric field, and is represented by the following equation, for example. There is. P = a · f · E ² · ε · tan δ (where a is a constant, f is the frequency, E is the strength of the applied electric field, ε is the relative permittivity of the dielectric, and tan δ is the dielectric loss. That is, since the dielectric heating is heating by dielectric loss in principle, the powder layer, which is a poor conductor of electricity, self-heats from inside due to dielectric loss. Microwaves enter from the surface layer of the powder layer and are gradually propagated to the center of the powder layer while being absorbed by the dielectric loss. Therefore, in the case of a powder layer housed in a container, like a normal batch type heating furnace in the prior art, its cross-sectional area is large,
The strength of the electric field becomes weaker toward the inside, and it becomes difficult to heat the inside. However, when the heating part is formed in the tubular body as in the method of the present invention, the cross-sectional area of the powder layer can be made small, so that a substantially uniform electric field is applied to each part of the powder to uniformly generate heat and raise the temperature. You can

According to another aspect of the powder heating / supplying method of the present invention, when heating the powder, the number of heating operations of a plurality of heating units irradiated with microwaves or the output of the microwave oscillating device is changed. By adjusting the heating temperature. That is, depending on the type of powder, for example, the composition and particle size distribution, or the supply amount of the powder per unit time, or the condition of continuous casting operation, for example, the heating temperature of the powder according to the steady state or the unsteady state. It is desirable that the temperature can be adjusted to a predetermined temperature. From this point of view, a plurality of heating units are provided, and the number of heating operations of the plurality of heating units is changed at any time, or the electric power applied to the microwave oscillating device is changed at any time, and the output is adjusted, whereby the powder
This allows the adjustable range of the heating temperature of B to be widened.

Fine adjustment of the temperature of the powder thus secured within a wide temperature control range can be easily achieved by measuring the powder temperature after the temperature rise and controlling the output of the microwave oscillating device. can do. In addition, the plurality of heating units,
Usually, they are arranged in series, but they can also be arranged in parallel.

According to the present invention, the mold powder is heated to a predetermined temperature in advance by the above-mentioned method and continuously supplied into the mold. Therefore, the temperature of the portion of the powder layer in contact with the atmosphere in the upper portion of the powder is significantly higher than that of the conventional method in which a normal powder is charged at room temperature, the amount of heat removed from the molten steel to the atmosphere is reduced, and the temperature drop of the molten steel Can be suppressed. As a result, slab surface defects such as vertical cracks, pinholes, or slag entrapment are greatly reduced.

Further, since the heating temperature of the powder is controlled within a temperature range which does not cause decarburization reaction, sintering reaction, etc. which change the constituent components and physical properties of the powder, the powder is slagged. By controlling the speed constant, a sufficient heat retaining effect can be obtained without changing the quality of the powder layer above the powder.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a powder supply device used for carrying out the method of the present invention will be described with reference to the drawings showing the embodiments.

FIGS. 1, 2 and 3 are schematic views showing an embodiment of the present invention, and FIG. 1 shows a single microwave oscillating device and a single powder heating section (surrounded by an irradiation section). )
2 shows an embodiment in which a single microwave oscillation device and a plurality of heating units are provided,
FIG. 3 shows a plurality of microwave oscillators and a plurality of powders.
The example which provided the heating part is shown.

FIG. 4 is a schematic diagram for partially explaining in detail the embodiment shown in FIGS. 1, 2 and 3, and FIG. 5 is a schematic diagram for explaining a cross section A in FIG. is there.

In FIGS. 1, 2 and 3, 11 is an irradiating section which is provided so as to surround the heating section, 12 is a microwave oscillating device, 13 is a propagation tube, and 13a is a distributing device.
14 is an isolator.

From the tundish 1 through the nozzle 2
When producing molten slab by pouring molten steel 4 into the container 3, the powder is cut out from the hopper 6 by the rotary valve 8 into the transfer pipe 7 by a predetermined amount, and at the same time, the valve 10 and the gas supply pipe are supplied. A gas such as argon or nitrogen or air is introduced from the end of the transfer pipe 7 as a carrier gas via 9 to transfer the powder to the transfer pipe 7 and the powder supply pipe 7 '.
Is continuously supplied to the mold 3 via.

The apparatus according to the present invention comprises a non-metal pipe 18 which is connected to one end of a closed flow passage which is a transfer pipe 7 for transferring powder to the mold 3 or which is inserted in the closed flow passage. The heating unit, the irradiation unit 11 that surrounds the heating unit, the microwave oscillating device 12 disposed near the irradiation unit 11, and the microwave oscillating device 12 and the irradiation unit 11 are connected to each other. A propagation tube 13 for guiding the microwave to the irradiation unit 11,
It is characterized by comprising an isolator 14 inserted in the middle of the propagation tube 13.

When heating the powder, the microwave oscillated from the microwave oscillating device 12 is guided to the irradiation section 11 through the propagation tube 13 and is composed of the non-metal tube 18 surrounded by the irradiation section 11. The powder is continuously irradiated inside the non-metal tube 18 by irradiating the heating portion, and the powder is heated by self-heating based on the principle of dielectric heating as described above.

Both ends of the non-metal pipe 18 are connected to each other by connecting portions 7b and 7c in the middle of the transfer pipe 7 (usually a metal pipe), and the powder supply pipe 7'is freely swingable in the horizontal direction. So that the powder heated by the heating part is connected by the flexible connecting part 7a.
The powder is sprayed from the tip of the supply pipe 7'into the mold 3 at a high temperature to form the powder layer 5 shown in FIGS. 1, 2 and 3. The propagation tube 13 and the irradiation section 11 are made of, for example, a metal tube having a circular or rectangular cross section, and an isolator 14 inserted in the middle of the propagation tube 13 is a microwave oscillating device 12.
Since a part of the microwave oscillated from the microwave may be reflected from the heating part and return to the microwave oscillating device 12 side, this is for protecting the microwave oscillating device 12 by blocking this. The distribution device 13a shown in FIG. 2 is for inserting microwaves oscillated from a single microwave oscillating device inserted in the propagation tube 13 into a plurality of irradiation units.

Since the device of the present invention is constructed as described above, when the microwave oscillating device 12 is energized to generate a microwave, the microwave is radiated through the propagation tube 13 to the irradiation unit 1.
1 and is absorbed by the powder 20 which is continuously passing through the inside of the heating part composed of the non-metallic tube 18 surrounded by the irradiation part 11, and by the self-heating based on the principle of dielectric heating as described above. The powder-20 can be heated. In this case, a thermocouple 15 is arranged at the tip of the powder supply pipe 7'to measure the temperature of the powder being supplied, and according to the operation of the temperature setting device 16 and the control device 17 arranged in the vicinity thereof, The number of heating units heated by energizing the microwave oscillating device 12 is controlled at any time, or the microwave oscillating device 12
The temperature of the powder after heating is adjusted by controlling the output of the device at any time.

From another aspect, the apparatus of the present invention is characterized in that a plurality of heating units and irradiation units 11 are provided as shown in FIGS. 2 and 3. By arranging a plurality of units, the heating area of the powder can be made larger even when the microwave oscillator having the same output is used. Therefore, the unit time is longer than that of the single installation shown in FIG. The heating capacity per hit is increased, and the adjustable range of the heating temperature can be further expanded. Even when multiple heating units are installed,
It is not always necessary to irradiate microwaves to all the heating parts at all times, and for example, when the casting is unsteady, the powder is heated to a relatively high temperature by two of the two heating parts installed and the casting is performed. In the steady state, only one unit may be heated to a relatively low temperature.

From another aspect, the structure of the non-metal tube forming the heating section may be a double tube as shown in FIGS. 6 and 7. FIG. 6 shows the same parts as FIG.
FIG. 7 is a schematic diagram for explaining an embodiment of a mode different from this, and FIG. 7 is a schematic diagram for explaining a cross section B in FIG. The reason why the double tube is used is that the tube that constitutes the heating section is used when the temperature of the powder is heated to a relatively high temperature or when the heating and non-heating are repeated frequently.
Since it cannot be said that there is no possibility of damage to the
Although a seal cover 19 closely attached to the pipe 1 and the pipe 7 prevents the microwave from leaking to the outside, it is designed to further enhance the safety.

From another aspect, the apparatus of the present invention is characterized in that the material of the non-metal tube forming the heating section is quartz glass, silicon nitride, or ceramics mainly composed of alumina. Further, the non-metal pipe (inner pipe) 18 and the non-metal pipe (outer pipe) 18 'forming a double pipe as shown in FIGS. 6 and 7 do not have to be made of the same material, and for example, a powder of fluoride or the like can be used. It may be selected in consideration of the presence or absence of corrosion of the non-metallic pipe due to the components, the appropriate heating temperature range of the powder, and the like.

A ceramic mainly composed of quartz glass, silicon nitride or alumina has a very small dielectric loss angle and a small relative permittivity, so that it does not absorb microwaves so much that the powder passing through the inside thereof is not absorbed. Since microwaves can easily reach the powder, the powder can be efficiently heated. On the other hand, a quartz glass tube, a silicon nitride tube, or a ceramic tube made mainly of alumina absorbs less microwaves, and the heat generation is not excessively large as compared with the heat generation of the powder. Is not overheated, and there is no possibility of causing inconvenience such as deterioration of the powder and uneven temperature, which may cause problems.

Next, the effects of the present invention will be clarified based on Examples. FIG. 8 schematically shows a cast portion in the continuous casting machine used in this example. The two-hole immersion nozzle 21 attached to the lower part of the tundish that has received molten steel from the ladle is immersed in the molten steel M in the mold 22, and the discharge hole 21a of the nozzle 21 causes the short side surface of the mold 22. Molten steel M is discharged in the direction. 23A is a preheating powder according to the present invention, 23B is a heat retaining layer, 23C is a melting powder, 2
4 is a solidification shell. Molten steel having the composition shown in Table 1 was cast at a casting speed of 1.6 m / min in a mold of such a continuous casting machine (curving radius of 10 m), and a thickness of 250 mm,
A slab with a width of 1600 mm was produced.

[0041]

[Table 1]

However, in order to clarify the effect of the present invention, No. No. 1 strand was cast by applying the conventional method. In the case of the two strands, a mold powder having the composition shown in Table 2, which was preheated to 200 to 550 ° C. corresponding to the steady state and unsteady state of casting as shown in FIG. did. The device used is the device schematically shown in FIGS. 3, 4 and 5, and the frequency of the microwave oscillation device is 2450 MHz,
The output was 5 kw × 2 units, the heating section was made of quartz glass having a tube diameter of 50 mm, the heating section had a length of 50 cm, and the number of heating sections installed was two. The powder supply rate into the mold was 0.5 Kg / min on average, and the carrier gas type was argon.

[0043]

[Table 2]

By using this preheated powder, the temperature drop in the meniscus portion was significantly improved as shown in FIG. As a result, the frequency of occurrence of vertical cracks in the obtained slab was as shown in FIG. As can be seen from FIG. 11, in the example of the present invention, the vertical cracking occurrence rate was reduced to about 1/10 of that of the conventional method, and it improved to a level at which there was no problem in terms of slab quality. In addition, the occurrence of harmful defects other than vertical cracks,
In the conventional method, the average length of slabs was about 10 per 1 m, but none was found in the examples of the present invention.

Further, in another embodiment different from the above-mentioned embodiment, in the case of casting low carbon aluminum killed steel, the powder is heated to 200 to 550 ° C. in the same manner as in the above-mentioned embodiment and put into a mold for casting. As a result, as shown in FIG. 12, the pinholes under the epidermis of the slab could be significantly reduced as compared with the prior art.

[0046]

As described above in detail, according to the present invention, when the powder is charged into the continuous casting mold, the powder is heated by irradiating with microwaves in the pipe during the powder supplying process. The temperature should be a temperature at which the constituents and physical properties of the powder do not change, and the temperature should be adjusted to a predetermined temperature according to the steady or unsteady casting condition of continuous casting, and the heated powder should be put into the mold. Therefore, the following effects can be obtained.

That is, a powder having a high temperature and no change in the constituents and physical properties provides a continuous and sufficient heat retaining effect, and the slab surface defects such as vertical cracks, pinholes, slag entrapment, etc. Can be reduced to As a result, it is possible to significantly reduce the surface maintenance of the slab in the next step,
The reliability of product quality can be improved.

By microwave heating, the powder can be heated evenly and accurately to the inside without causing a decarburization reaction, etc., and the powder which is difficult to be heated can be easily and quickly heated to a desired temperature. Can be heated to.

Further, in the apparatus of the present invention, it is easy to provide a plurality of heating sections, and because of the characteristic of the dielectric heating for irradiating microwaves, the preheating time of the apparatus before the start of powder heating is not required and the powder is started at the same time when the energization is started. Since the heating can be started and the start-up time at the time of heating can be shortened, it is also easy to selectively heat at an arbitrary time during the unsteady state or the steady state of continuous casting. Furthermore, since the heating temperature can be controlled easily by changing the number of heating operations in the heating section or adjusting the output of the microwave oscillator, the temperature adjustment range is wide, the response is quick, and the operability is good. Is.

Further, since the heating portion is a tubular member in the middle of powder transfer, unlike a batch type heating furnace in which the powder is placed in a container, for example, heating can be performed continuously during transfer, The material of the material was made of quartz glass, silicon nitride, or ceramics mainly composed of alumina with a low dielectric loss, so that the microwave efficiently reaches the powder layer passing through the tube and the powder is heated to a sufficient temperature. It can be heated uniformly.

Further, according to the method of the present invention, the powder is preheated by self-heating based on the principle of dielectric heating by irradiating microwaves, so that the following drawbacks of the conventional method can be solved. That is, unlike the external heating method such as the conventional method, the heat source is the heat generated by the powder itself and there is almost no heat radiation to the outside of the device, so the working environment is not exposed to high temperatures,
Further, since it is the dielectric heating in the closed flow path, there is no leakage of high temperature gas or dust, so that the working environment is not deteriorated (in the present invention, the device such as a seal cover is used as described above. It is easy to prevent microwave leakage to the outside.) The microwave oscillating device and its control device can be easily located by arranging them at a position away from the casting work place and connecting them to the irradiation part with a propagation pipe. Further, it is possible to limit to a heating part surrounded by the irradiation part and the like, and the whole device is simple, but the vicinity of the work place can also be simplified, which is also an advantage.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic view showing an example of the present invention.

FIG. 3 is a schematic view showing an example of the present invention.

FIG. 4 is a schematic view for partially partially explaining the embodiment shown in FIGS. 1, 2 and 3 in detail.

5 is a schematic diagram for explaining a cross section A in FIG.

FIG. 6 is a schematic diagram for explaining an example of a different aspect of the same portion as FIG. 4;

FIG. 7 is a schematic diagram for explaining a cross section B in FIG.

FIG. 8 is a schematic explanatory view of the inside of a mold in the continuous casting machine used in the example of the present invention.

FIG. 9 is an explanatory view showing a heating situation of the mold powder in the embodiment of the present invention.

FIG. 10 is an explanatory diagram showing the temperature drop of the meniscus portion according to the method of the present invention in comparison with the conventional method.

FIG. 11 is an explanatory diagram showing the vertical crack occurrence rate when the method of the present invention is applied, in comparison with the conventional method.

FIG. 12 is an explanatory view showing a slab pinhole occurrence rate when the method of the present invention is applied, in comparison with the conventional method.

[Explanation of symbols]

1 ... Tundish, 3 ... Mold, 5 ... Powder layer,
6 ... Hopper, 11 ... Irradiation part, 12 ... Microwave oscillating device, 13 ... Propagation pipe, 14 ... Isolator, 15 ... Thermocouple, 16 ... Temperature setting device, 17 ... Control device, 18 ... Non-metal pipe ..

Claims (4)

[Claims] 1. When the powder is charged into the continuous casting mold, the powder is heated by irradiating it with microwaves in a tube during the powder supply process, and the heating temperature is set to the powder.
And the temperature at which the constituents and physical properties of
A method for heating and supplying a continuous casting mold powder, characterized in that the temperature is adjusted to a steady or unsteady casting condition of continuous casting and the heated powder is charged into the mold. 2. The continuous heating method according to claim 1, wherein the heating temperature is adjusted to a predetermined value by changing the number of heating operations of a plurality of heating units to which microwaves are applied or the output of the microwave oscillating device. Method for heating and supplying mold powder for casting. 3. A heating part which is made up of a non-metal tube inserted in the middle of the process of supplying powder to a continuous casting mold and which is irradiated with microwaves, and a heating part which surrounds the heating part. An irradiation unit, a microwave oscillating device arranged in the vicinity of the irradiation unit, a propagation pipe for connecting the microwave oscillation device and the irradiation unit to guide microwaves to the irradiation unit, and a midway of the propagation pipe. A heating and supplying device for a continuous casting mold powder, which is provided with an inserted isolator. 4. The non-metallic tube forming the heating section is made of quartz glass, silicon nitride, or a ceramic mainly composed of alumina.
A heating and supplying device for a continuous casting mold powder.