JPH0570756U - Ladle pipe - Google Patents

Abstract

(57) [Summary] [Purpose] When pouring the molten metal in the ladle through the ladle pipe, it is intended to prevent the ladle pipe from reacting with the slag and preventing the slag from adhering to the ladle pipe to improve the life of the ladle pipe. [Structure] A coating film made of zirconia ceramics is formed on at least inner surfaces of both ends of a ladle pipe 10 which constitutes a molten metal passage when pouring the molten metal inside the ladle into a mold or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ladle pipe, and more particularly to a technical means for improving the life.

[0002]

[Problems to be solved by conventional techniques and devices]

 When pouring the metal melt contained in the ladle into a mold or the like, a pipe (ladle pipe) 102 forming a passage of the melt 100 is provided in the ladle 104 as shown in FIG. 2, and the melt 100 is passed through the ladle pipe 102. The pouring of molten metal to the outside (mold etc.) is performed.

As the ladle pipe 102, a pottery ladle pipe has been conventionally used. However, the ladle pipe made of pottery has a problem of being cracked and damaged, and the slag 106 floating on the upper surface of the molten metal 100 is attached. However, there is a problem that the inner surface of the pipe is clogged.

Therefore, in the case of such a ladle pipe 102 made of earthenware, there is a problem that frequent cleaning is required in order to prevent clogging due to adhesion of the slag 106.

On the other hand, when the ladle pipe 102 is made of metal, such adhesion of the slag 106 is unlikely to occur, however, in the case of the metal ladle pipe 102, the slag 106 reacts with oxygen contained in the slag 106 and is significantly damaged. There is a problem that it ends up.

Further, in the case of the metal ladle pipe 102, there is a problem in that the molten metal solidified body hangs down at the end portion on the outflow side of the molten metal 100.

[0007]

[Means for Solving the Problems]

 The ladle pipe of the present invention was devised to solve such a problem, and its gist is a pipe that constitutes a molten metal passage when pouring the molten metal inside the ladle into a mold, This is because a film made of zirconia ceramics is formed on the inner surfaces of both ends.

Here, the coating film made of zirconia ceramics can be preferably formed by a thermal spraying method.

In this way, when the zirconia ceramics coating is formed on both end portions of the ladle pipe, that is, the inner end portion of the ladle on the side where the molten metal flows in and the outer end portion on the side of which the molten metal flows out to the outside, such a ladle pipe is made of ceramic Even in the case of using the one described above, the protective effect of the zirconia ceramics can prevent clogging due to the attachment of slag on the molten metal inflow side of the ladle pipe.

The zirconia ceramics do not react even when they come into contact with the slag, and therefore, the problem of slag adhesion and the clogging caused thereby does not occur.

Therefore, by forming such a zirconia ceramic film, it is possible to omit the frequent cleaning which is conventionally required for removing the deposit on the inner surface of the ladle.

On the other hand, in the case of using a metal ladle pipe, when a film of zirconia ceramics is formed on at least the inner surface of the end on the melt inflow side, the constituent metal and slag of the ladle are also protected by the protective effect of the zirconia ceramic film. Can be prevented, and melting damage of the ladle pipe due to the reaction can be prevented.

Further, in the case of a metal ladle pipe, since the wettability with the molten metal is good, the problem of dripping of the solidified metal occurs at the end of the molten metal on the outflow side. However, according to the present invention, zirconia ceramic When a film is formed, this can be effectively prevented.

In the present invention, it is possible to form a coating of zirconia ceramics on the entire inner surface and outer surface of the ladle pipe, but at least the inner surface of both end portions of the ladle pipe, preferably the inner surface of both end portions and the axial direction. It has been confirmed that the above problems can be effectively eliminated by forming a film of zirconia ceramics on both end faces.

[0015]

【Example】

Next, in order to further clarify the features of the present invention, its embodiment will be described in detail below. As shown in FIG. 1, the end surface 12a of the one end 12 (the end on the melt inflow side) is inclined at 60 ° with respect to the axis, and the end surface 14a of the other end (the melt outflow side) 14 is on the axis. A zirconia ceramic coating was formed by thermal spraying on the inner surface, outer surface, and both end surfaces of each end of the ladle pipe 10 made of SUS304 having the dimensions L ₁ and L ₂ of 180 cm and 205 cm, respectively.

Specifically, first, a portion indicated by a ray of the ladle pipe 10 made of SUS304 is shot-blasted to be roughened to an appropriate surface roughness, and then this portion is first made of a composition made of 80Ni-20Cr. The alloy was sprayed to a thickness of several tens of μm.

Next, a film of zirconia ceramics (ZrO ₂ -7 wt% CaO) was formed on the upper side of this sprayed metal film by thermal spraying to a thickness of about 200 μm.

The film formation of zirconia ceramics is preferably performed over the range of l ₁ = 65 to 90 cm and l ₂ = 40 to 60 cm in FIG. 1, and more preferably l ₁ = 70 to 90 cm. .

When this ladle pipe 10 was actually attached to a ladle and used, the life was improved several times or more as compared with the ladle pipe made of SUS304 alone.

Although the embodiment of the present invention has been described in detail above, this is merely an example. For example, in the present invention, the formation of the zirconia ceramics film on the outer surface of the ladle pipe is omitted, and the zirconia ceramics film is formed only on the inner surfaces of both ends, preferably on both inner surfaces and both end surfaces. It is possible to achieve the above-mentioned purpose, and it is of course possible to apply the present invention to a ladle pipe made of ceramics.

It is also possible to use partially stabilized zirconia ceramics or other fully stabilized zirconia ceramics using other stabilizers such as MgO, Y ₂ O ₃ and CeO ₂ as zirconia ceramics. The present invention can be configured in a form in which various changes are made based on the knowledge of those skilled in the art without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram of a ladle pipe according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the background of the present invention.

[Explanation of symbols]

 10 ladle pipe

Claims (1)

[Scope of utility model registration request] 1. A ladle pipe which constitutes a molten metal passage when pouring the molten metal inside the ladle into a mold or the like, wherein a coating made of zirconia ceramics is formed on at least inner surfaces of both ends.