JPH1177287A - Metal-made plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate oiling and cooling to a metal-made plate used for a sliding nozzle and to actually use this plate under sufficient durability. SOLUTION: In the metal-made plate used for the sliding nozzle device arranging a nozzle hole refractory 5 to a metal-made plate base body 3, when the surface hardness of this metal-made plate base body 3 is 1, the surface hardness of a faced other plate contacting with this plate at the time of sliding, is set at 1.6-10. Further, at the sliding surface side, a part having 1-5 mm width in a filling part 7 filled with monolithic refractory, is formed to the length having >=50% the peripheral length of the nozzle hole refractory 5, and at the non- sliding surface side, this filling part is set at 10-30 mm width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate for a sliding nozzle device used at the bottom of various molten metal containers.

[0002]

2. Description of the Related Art A plate used in a sliding nozzle device is in direct contact with a molten metal and repeatedly slides with each other. Therefore, a structural strength capable of withstanding the movement, erosion resistance to the molten metal, and smooth sliding. It is required to have a high-precision sliding surface for movement.

Conventionally, this plate has structural strength,
Al ₂ O ₃ -C refractories in terms of melting loss resistance is commonly used, it is carried out with high precision of the sliding surface lapped with a diamond tool. Further, as a measure to compensate for the lack of structural strength of the refractory itself, a metal band is shrink-fitted on the outer peripheral surface of a plate made of the refractory, or a mortar is set in a metal case.

[0004] Even with such a measure, the occurrence of cracks in the refractory due to rapid heating due to contact with the molten metal cannot be avoided, and not only structural deterioration but also abnormal melting of the refractory due to entrainment of air. It also leads to loss.

Further, as a measure, a system in which a refractory ring is fitted to a metal plate having excellent toughness is proposed in Japanese Utility Model Laid-Open No. 52-63120.
In this method, metal is mainly used as a component of the plate, so it is difficult to crack, easy to process, and it is possible to use magnets for mounting, so the application of the sliding nozzle device can be expanded, In addition, there is an advantage that costs can be reduced. However, the proposed structure requires cooling and lubrication of the plate during casting, which is extremely complicated and impractical to operate.

[0006]

An object of the present invention is to eliminate the need for lubrication and cooling of a metal plate used in a sliding nozzle device, and to provide sufficient durability to the metal plate. An advantage of the invention is to realize its practical use by fully exhibiting its advantages.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a metal plate used in a sliding nozzle device in which a nozzle hole refractory is disposed on a metal plate base, and the surface hardness of a metal portion of the metal plate is provided. When the surface hardness of the metal part of the mating plate that comes in contact with the sliding member is set to 1.6, the surface hardness is 1.6 to
10 is characterized.

The hardness ratio of the upper and lower metal plate bases is represented by the hardness expressed by Brinell hardness or Vickers hardness. The hardness ratio is expressed by the value of the larger hardness / the smaller hardness. When the hardness ratio is less than 1.6, the sliding can be performed at first, but if the sliding is performed many times, the sliding becomes impossible on the way and the durability is deteriorated. If it exceeds 10, wear of the metal having a lower hardness is large and durability is reduced.

Regarding the material of the metal plate base,
Any material that satisfies the combination of the hardness ratios and has a heat resistance of 300 ° C. or more, for example, iron, nickel,
Aluminum, copper, or an alloy thereof is easy to use in terms of economy. Among these, for example, structural carbon steel is J
Chemical components are determined by IS standard, and C and Mn are
The hardness changes depending on the content of. That is, it is practically convenient to select and use carbon steel having different components in such a manner that the hardness ratio is in the range of 1.6 to 10.

In order to utilize the advantages of high structural strength and high impact strength of the metal forming the plate base, the metal is preferably used in a volume ratio of 50 to 90% of the entire plate. If it is less than 50%, the advantages of metal cannot be used, and 9
If it exceeds 0, a problem occurs in heat resistance.

In this metal plate, a nozzle hole refractory is attached to a through hole formed in a metal plate base via a filling layer of an irregular refractory, and a filling arrangement is provided on a sliding surface side thereof. The width of the filled part of the irregular shaped refractory is 1 to 5 m
m is formed over a length of 50% or more of the circumference of the nozzle hole refractory, and on the non-sliding surface side, the width of the filling portion of the irregular refractory is 10 to 3 over the entire circumference of the nozzle hole refractory.
By making the width 0 mm, a more stable metal plate can be obtained.

The nozzle hole refractory is a refractory having a through hole through which molten steel passes, and can be used without any problem as long as it is a material generally used for a continuous casting nozzle or the like. . Furthermore, taking advantage of the small shape of the nozzle hole refractory, there is an advantage that a dense and highly corrosion-resistant material that cannot be used in a normal plate shape in terms of thermal shock can be used. The shape of this nozzle hole refractory is
It is determined according to the damage situation, and there is no particular limitation.

The refractory material for the nozzle hole is fitted into the through hole of the metal plate base through a fire-resistant adhesive such as mortar.

Further, it is possible to adopt a structure in which a portion made of a refractory material is made small, and a metal portion is brought into contact at a position where the plate is closed. With this structure, the contact portion of the molten steel can be solidified and closed by the heat capacity of the metal portion forming the plate base. This structure can use the function more effectively in the case of a sliding nozzle device for molten steel tundish in which the nozzle hole is closed only at the completion of casting.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

Embodiment 1 FIG. 1 is a sectional view of a sliding nozzle device using a metal plate of the present invention. In the figure, a sliding nozzle device A has an upper plate 10 and a lower plate 20 according to the present invention attached to the lower end of an upper nozzle b attached to a tuyere brick a at the bottom of a tundish so as to be in contact with each other on a sliding surface. Have been.

FIG. 2 is an enlarged sectional view of the upper plate 10 shown in FIG. 1, and FIG. 3 is a plan view seen from the sliding surface S taken along the line II in FIG. As shown in these figures, the upper plate 10 has a metal plate base 3 provided with a projection 2 at a position where the nozzle hole 1 is located, and the projection 2 is provided with a through hole 4. And has a structure in which a nozzle hole refractory 5 is arranged in the through hole 4. A step 6 is formed on the inner surface of the through hole 4 in which the nozzle hole refractory 5 is disposed, and the opposite side has a shape extending in the length direction on the sliding surface side as shown in FIG. I have. By mounting the nozzle hole refractory 5 having a step corresponding to the step 6, it is possible to prevent the nozzle hole refractory from shifting in the non-sliding surface direction due to the pressure received from the mating plate on the sliding surface. .

Further, between the through-hole 4 and the nozzle hole refractory 5, a filling portion 7 of an irregular refractory is formed, and the nozzle hole refractory 5 is filled with the metal plate base 3 through the filling portion 7.
It is integrated with. For this reason, the filling portion is provided at a uniform width of 15 mm around the nozzle hole refractory on the non-sliding surface side, but the portion of 3 mm width on the sliding surface side has a circumferential length of the nozzle hole refractory. It is provided over a length of about 70%, and the remaining portion is widened to include a surface that comes into sliding contact with the periphery of the nozzle hole of the mating plate.

On the other hand, since the portions of the plate sliding surface that come into contact with the nozzle holes 1 during sliding are severely damaged, there is no problem even if the use range of the filling portion 7 of the irregular refractory is expanded. Further, the irregular-shaped refractory having a narrow filling portion can be used by changing the particle size, material, and the like of the irregular-shaped refractory forming the filling portion of another portion.

The width of the filling portion 7 of the irregular-shaped refractory is such that the smaller the sliding surface side is, the more the nozzle hole refractory 5 which is the inner hole during sliding.
It is preferable because the displacement can be prevented. In order to prevent this displacement, a filling section 7 filled with an irregular refractory on the sliding surface is used.
The width of 1 to 5 mm corresponds to the circumference of the nozzle hole refractory 5.
It must be formed over a length of 0% or more.
If the width of the filling portion 7 is less than 1 mm, poor filling of the irregular-shaped refractory occurs, so that the corrosion resistance is reduced and there is a problem of joint erosion. If the width exceeds 5 mm, the nozzle hole refractory 5 may shift during sliding. When the portion having a width of 5 mm is 50% or less of the perimeter of the refractory of the nozzle hole, the portion having a width exceeding 5 mm increases, so that the refractory of the nozzle hole is easily shifted. If it shifts in the non-sliding direction during use, a gap is generated between the surfaces and molten steel infiltrates, and there is a possibility of steel leakage, which is extremely dangerous. This step can be partially contacted directly,
Alternatively, it may be tapered. Also,
Even if a protrusion such as a metal band is formed on the outer periphery of the nozzle hole refractory separately from the step, it is effective in preventing displacement. On the non-sliding surface side of the plate, the filled portion of the irregular-shaped refractory is 10 to 3 parts.
Preferably, the width is 0 mm. In other words, in the setting work of the nozzle hole refractory, the sliding surface of the metal plate is placed on the surface plate, and for example, in the case of a castable, the castable is cast from above, so that the workability of casting the castable and the castability of the castable are set. The wider is better because of the hot water effect due to its own weight.

The nozzle hole refractory 5 having such a structure can be mounted by setting the nozzle hole refractory 5 from the sliding surface side of the metal plate base 3 and then pouring a castable therebetween. . Specifically, a metal plate base 3 and a nozzle hole refractory 5 polished in advance are placed on a surface plate during the setting operation so that the polished surface is in contact with the surface plate, and an irregular refractory material such as a castable is placed therebetween. By filling with an object, a plate with high surface accuracy can be obtained without polishing the sliding surface after setting. Further, it is preferable to apply a lubricant such as graphite or molybdenum disulfide to the sliding surface S of the polished metal plate base 3. Without a lubricant, it is difficult to slide smoothly and the durability is reduced. The lubricant may be applied on the way depending on the use situation.

The lower plate 20 shown in FIG. 1 also has the same structure as the upper plate 10, but the hardness of at least the sliding surface of the metal plate base 3 constituting the lower plate 20 is the same as that of the upper plate 10. It is preferable to use one having a hardness different from that of the plate base 3. In particular,
When the Brinell hardness of the metal plate of the lower plate 20 is 135, the Brinell hardness of the metal plate of the upper plate 10 is 230, and the hardness of the metal plate base of the lower plate 20 is 1, The hardness of the plate 10 was 1.9.

[0023]

[Table 1] Table 1 shows the results of tests on the hardness and sliding characteristics in the shape shown in FIG.

In the test, a plate having two sets of bases having a shape of FIG. 2 and a sliding surface area of 450 cm ² and different hardnesses was used in an actual sliding nozzle device,
With the plate sandwiched under a pressure of 3000 kg, the inside of the nozzle hole was heated with a burner, the inner hole surface temperature was kept at 1200 ° C., and the sliding was performed 50 times. Thereafter, the plate was taken out and the state of the sliding surface was observed.

Alumina-carbon material was used as the nozzle hole refractory 5, and alumina castable was used as the irregular refractory.

Application Example 1 shown in Table 1 has a Brinell hardness of 23.
The upper plate using the carbon steel S50C for machine structure of No. 0 as a metal plate plate and the lower plate using the carbon steel S25C for machine structure with a Brinell hardness of 135 as a metal base have a hardness ratio of 1. 7 was tested. The sliding operation was performed 50 times without any problem, and the sliding surface after use was scarcely damaged.

[0027] Also in the application examples 2 to 5, the hardness ratio was within the range of the present invention, and there was no problem even after 50 times of sliding, and the sliding surface after use was good with almost no scratches.

On the other hand, in Comparative Example 1, the sliding resistance was increased from the tenth slide and the sliding was not smooth, and large scratches were observed on the sliding surface after the test.

In Comparative Example 2, the lower plate side suffered large abrasion and secondary flaws caused by the abrasion.

The sliding nozzle device equipped with the metal plate of application example 2 was attached to a tundish,
The steel was continuously cast for 0 minutes, but no sliding scratches were found that could be used.

Embodiment 2 An example in which the present invention is applied to an intermediate plate of a three-plate sliding nozzle will be described. FIG. 4 shows a cross-sectional configuration diagram thereof. In the figure, the sliding nozzle device B is
An upper plate 10 and a lower plate 20 according to the present invention are attached to the lower end of an upper nozzle b mounted on a tuyere brick a at the bottom of the tundish so that they contact with each other on a sliding surface, and an intermediate plate 30 is mounted therebetween. I have. FIG. 5 is a plan view of the intermediate plate 30 shown in FIG.

Upper plate 10 and lower plate 20
Is a steel material having the same hardness as that of the metal plate base 3 in the same format as in the first embodiment. The hardness of the metal plate base 3 constituting the intermediate plate 30 is 120 in Vickers hardness and the ratio of the hardness of the metal plate 7 of the upper and lower plates (760 in Vickers hardness) to 6.
It is set to 3.

In the case of this embodiment, the intermediate plate 30 is also
Since the base 3 is formed of metal, it can be directly machined, and processing for direct connection with the drive unit 8 can be easily performed.

As the nozzle hole refractory 5 in the intermediate plate 30, a ring-shaped zirconia-carbon material is used, and the metal plate base 7 has a shape that is divided at the center of the thickness. In the space formed by both,
The joint is formed by the filling portion 7 of the irregular-shaped refractory material. The joint width on the sliding surface is 3.5 mm, which covers the entire circumference of the standard refractory material. The joint having a width of 25 mm continuous with the narrow joint is 15 m, which is more than one third of the height of the standard refractory material of 30 mm.
m height. Here, in order to obtain the same effect as the hot-water effect of the first embodiment, a press-fittable irregular-shaped refractory material is used, and a platen (not shown) is placed on the upper and lower sides and press-fitted, so that the upper and lower sliding members are used. Can be formed. In order to make the thickness of the nozzle hole refractory 5 and the thickness of the metal plate 7 uniform, processing of the metal plate 9 which is easy to process is performed before press-fitting.

[0035]

【The invention's effect】

(1) By specifying the hardness ratio between the metal plate substrate and the mating metal plate substrate that comes into contact with the metal plate substrate when sliding, lubrication and cooling are not required, and sufficient durability can be obtained.

(2) The nozzle hole refractory can be easily mounted on a metal plate base, the nozzle hole refractory is firmly fixed, and the nozzle hole refractory during use is not displaced and can be used safely. .

(3) By using a metal base for the plate, the toughness is improved, the resistance to impact is improved, and the life of the plate is extended.

(4) Since the precision of the machining of the plate is high and a magnet can be used, the automatic plate changing device can be simplified.

[Brief description of the drawings]

FIG. 1 shows a sectional structure of a sliding nozzle device to which a metal plate of the present invention is applied.

FIG. 2 shows an enlarged sectional view of the upper plate shown in FIG.

FIG. 3 is a plan view of the upper plate as viewed from a sliding surface taken along line II of FIG. 2;

FIG. 4 is a sectional view showing an example in which the present invention is applied to an intermediate plate of a three-plate sliding nozzle.

FIG. 5 is a plan view of the intermediate plate shown in FIG.

[Explanation of symbols]

A, B Sliding nozzle device a Tuyere brick at bottom of tundish b Upper nozzle S Sliding surface 10 Upper plate 20 Lower plate 30 Intermediate plate 1 Nozzle hole 2 Projection 3 Metal plate base 4 Through hole 5 Nozzle hole Refractory 6 Step 7 Filling section of irregular shaped refractory 8 Drive section

Claims (2)

[Claims] 1. A metal plate used for a sliding nozzle device in which a nozzle hole refractory is disposed on a metal plate substrate, wherein the metal plate substrate has a surface hardness of 1, and a mating member that comes into contact when sliding. The surface hardness of the metal part of the plate of 1.
A metal plate, characterized in that the plate is 6 to 10. 2. The metal plate according to claim 1, wherein a nozzle hole refractory is attached to a through hole formed in the metal plate base through a filling layer of an irregular refractory. The filling section where the substance is filled is arranged on the sliding surface side.
A metal plate, wherein a portion having a width of 1 to 5 mm is formed over a length of 50% or more of the circumference of the nozzle hole refractory, and a non-sliding surface side has a width of 10 to 30 mm over the entire circumference.