JP2802304B2 - End tab made of refractory material for welding and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end tub made of a refractory material for welding and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various shapes of end tabs made of a refractory material for welding have been used. When the use surface of the end tab has a weir and a molten metal receiving surface,
It is roughly classified into a type in which the use surface is formed on only one side of the end tab, and a type in which the use surface is formed on both the front and back surfaces of the end tab. In the case of the latter type, as shown in FIG.
2 _1, 2 ₁ 'and the weir 2 ₂ having an inclined surface, 2 _2' and the molten metal receiving surface 3,3' is symmetrically, i.e., that are formed in mirror symmetry, was common.

[0003] However, when an end tab having such a shape is manufactured by molding → firing, the press-molding in the molding step naturally uses a mold having such a shape. There is a problem that the powder is not uniformly distributed in the mold. As a result, there is a problem that the thickness of the end tab must be increased because a portion having insufficient strength is generated, or the end of the end tab or the end of the weir is chipped off.

[0004] Therefore, when inserting the raw material powder into the mold,
According to the size of the uneven portion of the mold corresponding to the shape of the surface to be used, etc., a special means (for example, a mold vibrating device) for changing the raw material supply amount and uniformly distributing the raw material is used.
Originally, the shape was such that the press forming pressure acts non-uniformly, so that it was difficult to make it completely uniform. Also,
As a solution to the above-mentioned problem of the prior art, there has been proposed a device having a use surface in which a weir and a molten metal receiving surface are alternately arranged on both front and back surfaces.

On the other hand, as a material for the end tab made of a refractory material for welding, SiO ₂ : 45 to 70% by weight and Al ₂ O ₃ :
15-40%, MgO: SiO ₂ in the range of 5-30%,
It is known that the total of Al ₂ O ₃ and MgO is 90% or more and the apparent porosity is 5 to 40% (Japanese Patent Application No. Sho 5).
No. 8-129790). However, the end tab made of a refractory material for welding manufactured from this material has a disadvantage that the strength is not sufficient.

[0006]

The object of the present invention is to provide an inexpensive end tab made of a refractory material for welding which is high in quality, has high mechanical strength, high thermal shock resistance, high heat resistance and the like and is not damaged even when used. It is intended to provide a manufacturing method.

[0007]

Means for Solving the Problems In order to solve the above problems, the present inventors have conducted intensive studies on the structure and the component composition of the raw materials for the above-mentioned end tub, and as a result, have made the present invention. . That is, in the method for manufacturing a refractory end tab for welding according to the present invention, between the two weirs provided on both the front and back surfaces of the end tab, such as a weir having a vertical surface and a weir having an inclined surface. A mold having such a shape that the plane of the molten metal receiving surface provided in the above can be arranged alternately is used, and this mold has a weight percentage of Al ₂ O ₃ : 50 to 65.
_{%, SiO 2: 35~50%,} MgO, K 2 O, Fe 2
O ₃ and CaO: The refractory raw material powder consisting of 1% or less is simply inserted, whereby the molding pressure at the time of press molding is made uniform throughout the mold, and the distribution of the refractory material is made uniform.

Further, in order to solve the above-mentioned problems, in a welding refractory end tab having a weir and a molten metal receiving surface according to the present invention, the composition of the component is expressed by weight% and Al ₂ O ₃ : 5.
_{0~65%, SiO 2: 35~50%} , MgO, K
₂ O, Fe ₂ O _3, and CaO: each consisting of 1% or less and provided between these two weirs, such as a weir having a vertical surface and a weir having an inclined surface, provided on both the front and back surfaces. This is to provide a use surface in which a flat molten metal receiving surface is alternately arranged.

Further, in order to solve the above-mentioned problems, in a welding refractory end tab having a weir and a molten metal receiving surface according to the present invention, a lower end of the weir having a slope of the welding refractory end tab of the present invention is provided. That is, a root face is provided in the section. Furthermore, in order to solve the above-mentioned problem, in the end tab made of the refractory material for welding of the present invention, the weir of the end tab made of the refractory material for welding has a tapered portion provided on the molten metal receiving surface side.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A mold used in the method of manufacturing a refractory end tab for welding according to the present invention has a weir having a vertical surface and an inclined surface provided on both front and back surfaces of the refractory end tab. Two weirs, such as weirs, and the molten metal receiving surface provided between these weirs can be arranged alternately. Also, raw material to be molded placed in a mold of the present invention, i.e., refractory used in refractory steel end tab of the present invention, Al ₂ O ₃ by _{weight%: 50~65%, SiO 2:} 35~5
0%, MgO, K ₂ O, Fe ₂ O _3, and CaO: each consisting of 1% or less.

The reason for using Al ₂ O ₃ in this raw material is to enhance mechanical strength, thermal shock resistance, fire resistance and heat cycle resistance. If the amount used is less than 50%, the mechanical strength, thermal shock resistance, fire resistance and heat cycle resistance are reduced, and if it is more than 65%, the thermal shock resistance is reduced, the firing temperature is increased, and the cost is increased. It will be higher,
The range of the amount used was 50 to 65%.

The reason for using SiO ₂ is to lower the coefficient of thermal expansion and lower the firing temperature. If the amount is less than 35%, the thermal expansion coefficient increases, so that the thermal shock resistance decreases, the end tabs are easily broken, and the firing temperature increases. 50% of its usage
If the amount is larger than the above, Al ₂ O ₃ is decreased, so that the mechanical strength, the fire resistance and the heat cycle resistance are lowered, and the thermal shock resistance is also lowered due to the decrease in the mechanical strength. Therefore, the range of the used amount is set to 35 to 50%.

Further, in this raw material, MgO, K ₂
The reason why each of O, Fe ₂ O ₃ and CaO is set to 1% or less is that these components are impurities. Therefore, it is preferable that the content of each component is as small as possible.
This is because the above-described characteristics are not reduced.

The method for producing a refractory end tab according to the present invention uses the above-mentioned mold and refractory, and includes, for example, the steps of mixing raw materials, granulating, inserting raw material powder into a mold, press forming, drying, and firing. Can be manufactured. The mixing of the raw materials, granulation, insertion of the raw material powder into the mold, press molding, and drying in this step may be the same as the usual methods. The calcination is preferably performed at 1200 to 1500 ° C., which is slightly higher than the normal temperature, for about 24 hours.

The end tab 1 made of a refractory material for welding according to the present invention comprises:
The composition of the material is as described above, and an example of the structure is a weir 2 having a vertical surface as shown in FIG. 1 ((a) front view, (b) back view, (c) top view). _1, 2 ₁ has a ', weir 2 _2, 2 ₂ having an inclined surface' and the working surfaces made from the molten metal receiving surface 3 and 3 'two weirs 2 ₁ surface as shown (c), the 2 ₂ and two weirs 2 ₁ on the molten metal receiving surface 3 and the back surface
', 2 _2' and the molten metal receiving surface 3 'is what are alternately arranged.

The others welding refractory steel end tab 1 of the present invention, FIG. 2 ((a) front view, (b) top view) weir 2 ₁ having a vertical surface, as shown in, 2 ₁ ' has a weir 2 _2, 2 ₂ 'and the working surfaces made from the molten metal receiving surface 3, 3' having an inclined surface, weir having a vertical plane of the surface as shown in (b)
2 ₁ and the molten metal receiving surface 3 'which' weir 2 ₂ having an inclined surface '2 ₁ weir having a vertical plane of the back and weir 2 ₂ and molten metal receiving surface 3 having an inclined surface is staggered respectively together we are, the surface of the inclined surface root face 4,4' weir 2 ₂ 'having a weir 2 ₂ and the back surface of the inclined surface having a (4' are not shown.) is provided with a. The height of the root faces 4, 4 'can be appropriately determined according to the size of the end tab 1, but is about 2 mm or more.

[0017] the other one welding refractory steel end tab 1 of the present invention, a weir 2 _1, 2 ₁ having a vertical surface of the molten metal receiving surface 3,3' side as shown in FIG. 2 ', an inclined surface weir ₂ 2 having,
'Tapered portion 5 ₁ to the end of the 5 _1' 2 _2, it is provided with a 5 _2, 5 ₂ '. The angle of this taper can be determined as appropriate, but it is preferable to provide it at about 35 ° with respect to the vertical plane or in an arc shape. In addition, weirs 2 ₂ having an inclined surface with respect to weirs 2 ₁ and 2 ₁ ′ having a vertical surface shown in FIGS.
2 ₂ ', 35 ° to match the included angle of the welding base material, 45 °
Various angles can be set.

[0018]

In the present invention, Al ₂ O ₃ : 5 is used as a raw material.
_{0~65%, SiO 2: 35~50%} , MgO, K
₂ O, Fe ₂ O _3, and CaO: By using those each containing 1% or less, the mechanical strength, thermal shock resistance, fire resistance, and heat cycle resistance of the end tab made of a refractory material for welding can be increased. You. Also, by using a mold having a shape in which weirs and molten metal receiving surfaces can be alternately arranged on both the front and back surfaces, the thickness (height) of the space in the mold becomes relatively uniform. Even if the raw material powder is simply inserted, the molding pressure at the time of press molding can be made uniform over the entire mold and the distribution of the raw material can be made uniform. As a result, it is possible to obtain an end tab made of a refractory material for welding, which is high in mechanical strength, thermal shock resistance, etc., uniform and thin.

By providing the root face, even if the welding refractory end tab 1 is peeled off from the upper portion as shown in FIG. 4, no stress acts on the hatched portion shown in FIG. 5, and the portion is damaged. Since there is no such phenomenon, the chip does not adhere to the beat surface and can be used again. In FIG. 4, reference numeral 6 denotes a base material for welding, and reference numeral 7 denotes a backing metal. Further, by making the weir end portion tapered, the refractory end tab 1 for welding covers the tapered portion more than the base material to be welded, so that sufficient penetration of the base material can be obtained. In addition, the corner of the end tab weir is hardly damaged by the arc during use, and the end tab is tapered, so that it is extremely easy to peel off the end tab after welding.

[0020]

EXAMPLE 1 A weir having a vertical weir and an inclined weir provided on both front and back surfaces, and a mold having such a shape that a flat molten metal receiving surface provided between these weirs can be alternately arranged. Al ₂ O ₃ : 50.9% by weight, SiO ₂ : 3
8.8%, MgO, K ₂ O, Fe ₂ O _3, and CaO: 2.7% in total, and the remainder is blended with refractory raw material powder composed of moisture, organic substances and other inorganic substances → granulation → to mold In the process of inserting raw material powder → press molding → drying → firing, Al ₂ O ₃ : 54.7% by weight and SiO ₂ : in the shape shown in FIG.
_{41.6%, MgO, K 2 O} , Fe 2 O 3 and CaO:
End tabs made of a refractory material for welding were manufactured, which consisted of a total of 2.9% and other inorganic substances: 0.8%. The drying in this manufacturing process was performed at room temperature for 48 hours. The firing is 12
Performed at 80-1300 ° C. for 24 hours. This end tab made of refractory material for welding may be broken by use,
It was not damaged or brittle. Further, the molten flux adhered well to the end tub itself.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the invention.

[0022]

According to the present invention, the above-described configuration enables
It has the following excellent effects. (1) An inexpensive end tab made of a refractory material for welding can be obtained with high quality, high mechanical strength, high thermal shock resistance, high fire resistance and high heat cycle resistance. (2) Since the root face is provided at the lower end of the weir having the inclined surface, the lower end of the weir is not damaged, and the chip does not adhere to the beat surface. can do.

[Brief description of the drawings]

FIG. 1 is a view showing an example of an end tab made of a refractory material for welding according to the present invention, in which (a) is a front view, (b) is a back view,
(C) is a top view thereof.

FIG. 2 is a view showing another example of the end tab made of a refractory material for welding according to the present invention, in which (a) is a front view and (b) is a top view.

FIG. 3 shows the shape and dimensions of an end tab made of a refractory material for welding according to one embodiment of the present invention, wherein (a) is a front view thereof,
(B) is a back view, and (c) is a top view.

FIG. 4 is an explanatory view showing a procedure for removing an end tab after welding.

FIG. 5 is a diagram showing a damaged portion of a conventional end tab.

FIG. 6 is a top view of a conventional end tab.

[Brief description of reference numerals]

1 welding refractory steel end tabs 2 _1, 2 ₁ 'weir 2 ₂ having a vertical surface, 2 _2' weir 3,3' molten metal receiving surface 4,4' root face portion 5 ₁ having an inclined surface, 5 ₁ ' , 5 ₂ , 5 ₂ ´ Tapered section 6 Base material 7 Backing material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-18710 (JP, A) JP-A-58-84914 (JP, A) Jiko 61-24382 (JP, Y2) Design registration 674003 (JP , S) Weekly Steel Structure Journal NO314 (July 11, 1988), P3 Weekly Steel Structure Journal NO275 (October 12, 1987), P3 (58) Fields surveyed (Int. Cl. ⁶ , DB name) ) B23K 37/06 C04B 35/00

Claims (4)

(57) [Claims] When manufacturing a welding refractory end tab, the welding refractory end tab is provided on both the front and back surfaces of the welding refractory end tab.
Using a mold having a shape in which two girder weirs and a flat molten metal receiving surface provided between these weirs can be arranged alternately,
Al ₂ O ₃ : 50-65% by weight, SiO 2
_{2: 35~50%, MgO, K} 2 O, Fe 2 O 3 , and C
aO: Welding refractory characterized in that by simply inserting a refractory raw material powder of 1% or less in each case, the molding pressure during press molding is made uniform over the entire mold and the distribution of the refractory material is made uniform. Manufacturing method of end tab made of material. 2. A welding refractory end tub having a weir and a molten metal receiving surface, wherein the component composition is A by weight%.
_{l 2 O 3: 50~65%,} SiO 2: 35~50%, M
gO, K ₂ O, Fe ₂ O ₃ and CaO: each consisting of 1% or less, two weirs and two weirs provided on both the front and back surfaces
An end tab made of a refractory material for welding, comprising a use surface in which a flat molten metal receiving surface provided therebetween is alternately arranged. 3. The welding refractory end tab according to claim 2, wherein
One of the weirs is a weir having an inclined surface.
The end face made of a refractory material for welding according to claim 2, wherein a root face is formed at a lower end portion of the weir to be received on a molten metal receiving surface side . 4. The weir of the end tab made of refractory material for welding,
The refractory welding end tab according to claim 2 or 3, wherein a tapered portion is provided on the molten metal receiving surface side.