JPS58184038A - Pipe of gating system made of metal - Google Patents

Abstract

PURPOSE:To provide a pipe of gating system made of metal which prevents the erosion effect and carburization phenomenon of the changing flow of molten metal by forming an Al2O3 film on the in side surface side of a metallic pipe in contact with the molten metal and an Fe-Al alloy layer wherein the concn. and thickness of Al are specified in continuation therewith. CONSTITUTION:An Fe-Al alloy layer wherein the concn. of the Al in the outermost part is 15-35wt% and the thickness is 0.1-1.0mm. is formed on at least the side (inside surface side) of a metallic pipe made of carbon steel, alloy steel, stainless steel or the like in contact with molten metal. The Al2O3 film on the surface is dense, prevents the intrusion of oxygen atoms and metallic atoms and withstands the erosion effect of the charging flow. Since the film prohibits the intrusion of carbon atoms, it can be prevented from a carburization phenomenon. The metallurgical binding between the Al2O3 film and the alloy and between the alloy and the base of the metallic pipe is secure and there is no possibility of failure, etc. caused by thermal impact in the stage of casting. Such pipe of gating system is suited for a casting mold, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel gold l1lll! Things related to sprue system pipes have changed, especially sprue system pipes for casting molds.

As is well known, casting molds are assembled using sand molds, metal molds, etc., and most molds are equipped with a sprue system. The sprue system following the sprue is generally divided into the sprue, sprue bottom, -way, and weir, but the sprue system pipe in the present invention refers to all of the above-mentioned sprue, sprue bottom, runner, and weir, or to these -S. Refers to the pipe to which it is applied.

Conventionally, sprue system pipes are generally molded with sand for small castings and coated with molding material to ensure sand surface smoothness and smoothness, and for medium and large castings, the sprue system pipes are molded with sand and are coated with a molding material of 200 to 114 mm in length for medium and large castings.
It is assembled using a patching method using O-ceramic tubes or expanded Chamossi tubes.

However, the conventional methods using these refractory sprue pipes have the following problems. In other words, in terms of the quality of the casting and the gap during casting, a ceramic pipe or a shamotsu F pipe O# as shown in Fig.
I loss is likely to occur, and these are directly linked to defects in the casting product as sand build-up and sand build-up. One way to avoid these negative factors is to add excess metal to the casting in advance, collect the above-mentioned build-up in this area, and remove it during post-process machining, but this method has a negative impact on product yield. It is inevitable that the cost of the product will increase due to the increase in man-hours (in addition to the decrease in heat resistance), if there is a lot of washing or melting damage, it will cause leakage of hot water and blockage of the runners, making it difficult to continue casting. make impossible.

On the other hand, from the perspective of molding work and man-hours, even if you try to install the runners and weirs in the ideal position in the casting plan, the ceramic pipe or chamotte pipe method is a refill method, and the length of the pipe and the joint There is no degree of freedom as it is dominated by the shape of *
Shitsuke has problems such as location restrictions. Furthermore,
In order to fix these and to collide with the molten metal during casting (1"
To prevent cracking caused by the static pressure of the S% solution, a cast iron frame is usually used, and the middle part is firmly solidified by ramming with sand mixed with a binder. Misalignment or damage may occur, which not only reduces work efficiency but also causes hot water to leak.

There is a strong demand for the development of a length of 9 m + 1 or a tube that prevents this slippage and damage and reduces manufacturing man-hours.1...
:1 However, due to problems such as damage and cost during manufacturing and transportation handling, currently only a limited length of lflk 600 mm Q degree is available.

To give an example of the current state of use, nine ceramic tubes 4 are added to the a-le casting casting 11 shown in Fig. 1141 to form nine sprue system tubes, and ll& of the same composition and temperature as in Example 1 is injected, and the casting is cooled. The appearance of sprue 2 after disassembling the mold is shown in Figure 6 (
- There is no damage or leakage in the sprue during pouring, but the 4C sprue in the upper left of the photo has peeled off, and the inner surface of the sprue is fI! ? It is attached to the sprue metal so that it appears white in the photo.

Furthermore, the @! ! As shown in 1(m), the inner surface of the sprue appears to be melted and damaged in black spots.

As described above, the conventional sprue system is made of pipe refractories, but the disadvantage is that it is prone to breakage, and due to the restriction on the length of the pipe, there is a difference in the 7th time when adding 9th time, and when the time when adding 7th time is 7th time. The problem is that the casting product is defective due to the separation problem and the biggest defect, the melting of the nine sprues mentioned above, and the hot water leakage due to cracks in the sprue caused by heat-IP will cause blockage of the runner and prevent casting. There are 6 and 9 drawbacks such as points that make it impossible.

To solve the above-mentioned problems, we attempted to use a metal sprue system pipe that would not be damaged during handling, and instead of the ceramic pipe in Fig. 1, we used a long ordinary steel pipe 8TK/aO (external 11s0.
A cast iron reel was cast under the same conditions as in Example 1 except that the chemical composition was similar to that of Example 1. The casting conditions are as follows.

Roll body diameter as cast dimensions: roll diameter 500m, length 11600m
m Injection amount: 3100kg Molten metal chemical composition 1 amount -): C81Mu P3.2
70.910.550.075 8 NI Cr M.

O,0242,600,180,11 Injection temperature: 13! SOw Injection time: 2 minutes and 30 seconds After cooling the casting, the rust layer was dismantled and the cross-sectional condition of the sprue was as shown in the photograph No. 711.

The outer Ka steel pipe of the core cast iron roll material cannot be seen at all and has been melted and damaged without retaining its original shape.

Although the outer MVC was originally packed around the outer periphery of the steel pipe, it was found that the cast iron roll material seeped into the sand and formed a bonding layer of sand, making it unsuitable for use as a sprue system pipe. did.

The reason for this is that the carbon concentration in cast iron is much higher than that in steel pipes, so carbon diffuses from the molten metal into the base of the steel pipe at the sprue, resulting in carburization, which results in the steel pipe having a low melting point.9 This carburization phenomenon and the erosion of the injection flow It is considered that the synergistic effect of this effect caused the rounding to rapidly melt away.

Next, in order to prevent this carburization phenomenon, a refractory material such as kt, 0° powder was applied to the inner surface of the copper tube by 0.2 to 1. A similar experiment was carried out using a ship with a thickness similar to that of the sail surface.

However, erosion was observed as well. This is a carburization phenomenon that occurs as a result of the thermal shock during pouring, the significant difference in thermal expansion coefficient between the large material coating layer and the steel pipe body, and the erosion effect of the injection flow, which causes the large material coating layer to peel off and expose the steel pipe surface. This is thought to be because it could not be prevented.

It should be noted that a commercially available sprue system pipe made of refractory model steel pipe that is free from peeling and erosion and can withstand practical use has not yet been developed.

Thus, the present invention solves the above-mentioned problems and creates a new metal that prevents erosion and carburization of the injection flow during injection into a bathtub, does not cause melting loss, and does not cause damage even when subjected to thermal shock. The purpose is to provide a sprue system pipe.

According to the research and experiments of the present inventors, the purpose is to form a surface A401 coating on at least the side that comes into contact with the molten metal and a 9F--At alloy layer continuous with this, and to form the uppermost layer of this alloy layer. External k1m degree 15~35 weight-1 thickness 0.1~L
It has been discovered that this can be achieved by a metal sprue system pipe characterized by Omn.

To explain the present invention in more detail, in the present invention, the above-mentioned Kinra 08 coating and Fe-A7 layer are provided on at least the inner surface of metal pipes such as various steel pipes that are in contact with the molten metal. Of course, it is also included when providing a coating or layer not only on the inner 1 + lll but also on the outer WJ which does not come into contact with the molten metal.

As in the present invention, the surface A2.0. In order to form a coating and a continuous 9F@-AL heavy layer on the metal pipe, at least on the side that contacts the molten metal, the metal pipe is usually first treated with an AJ diffusion treatment machine called ging. An F.-A4 alloy layer is formed on the surface of the metal tube, and then a secondary heat treatment is performed to further form an At, 0° coating on the surface.

In this At diffusion covering method, the metal tube to be treated is usually surrounded with a permeating agent of each fa@ powder method in an unsealed metal container such as an iron box, and the temperature is about 850 to 1050 degrees [K10-1].
It can be practiced by keeping it for five hours. As penetrating agents, for example, Fe-a alloy powder with a low A11 degree and MutSO-1F.
・A mixture with Fe-Aj alloy powder having 50% or a mixture of 0.0% Fe-Aj alloy powder and KT powder is used, and a small amount of permeation promoter such as ammonium chloride is added to the mixture.

When the metal tube KA7 is subjected to the diffusion brazing treatment in this manner, a li'e-AL heavy layer is formed on its surface. Then, by forming such an F--At alloy layer on the surface, nine metal tubes were manufactured for 800 years.
When secondary heat treatment is carried out (in an oxidizing or reducing atmosphere at −1000ν for 10 to 120 minutes), a dense and strong At and Oa nucleation occurs on the surface and a continuous f
c A metal tube with a Fe-At alloy layer is seen. In addition, during the secondary heat treatment, the F.-At alloy layer is selectively converted to vc1m before the Fe in the alloy layer, so no iron oxide film is formed on the F.-At alloy layer. , only the film of the film 40a is produced.

By adjusting the At concentration in the penetrating agent, temperature, time, etc. during the treatment with the At diffusion model, the F.-A
j Q Kim J-'s outermost feelings, 0. As mentioned above, the Ald degree of the continuation of the subject is 15 to 35 degrees, preferably 28 to 32 weight - 1 float of 0.1 to 1 eOm.
m, preferably in the range of 0.3 to 0.8 mm. In general, the value of 1** in the alloy layer decreases linearly from the outermost layer to the inner layer. Also, by adjusting the secondary heating conditions, the
A mu t1 ua retraction with a thickness of 0μ is generated. In the present invention, normally, the F--U alloy layer and the surface film are formed by first At diffusion treatment and then secondary heat treatment, but the permeation during U expansion and horizontal heating is Depending on the agent or geographical conditions, the F/-U alloy layer and its surface may have At, 0. A film may be formed at the same time, or a Fa-At alloy layer may be formed on the surface, and a film may be formed on the surface at the time of injecting hemorrhoidal water, both of which are included in the present invention.

In this way, nine A
2.0. The coating has poor compatibility with the molten metal, that is, poor wettability, so that even when it comes into contact with the molten metal, it does not adhere directly to the bath, and therefore serves to protect the metal tube from corrosion.

The fifth factor is a photograph showing a cutaway of the lower part of the sprue in Example 1. A film is formed and solidified in the Kuyu sprue pipe and the sprue, and a black edge clearly showing the gap between the Kuyu metal and the Kuyu metal is set aside. The existence of this gap makes it clear that the above-mentioned compatibility or wettability is poor.

The metal tube is therefore effectively protected from attack by the molten metal.

This kt, 0. As is clear from the fact that it exists in the form of 11 as an impurity in steel, it does not form compounds with the molten metal, so it maintains its melting point of 2051 and is able to withstand the erosional effects of the injection flow. can.

The At, O, film on this surface is dense and prevents the penetration of dispersion atoms, or metal atoms with a much larger atomic radius than that, and also prevents the penetration of medium-sized carbon X atoms. Since no intrusion is allowed, carburization caused by carbon in the molten metal can be prevented. Furthermore, At, 0. When the F--At alloy layer, which is continuous with the coating and is provided inwardly, undergoes At diffusion treatment as described above, the carbon atoms originally present in the alloy layer become solid solution in the F--kt alloy layer. 69 Therefore, the surface At, 0. In addition to the coating, the presence of the F.-m alloy layer inside the coating greatly contributes to preventing the above-mentioned carburization phenomenon.

Moreover, the number of people who come into contact with molten metal is 110. Film and continuous F
-The metallurgical adhesion between the -A4 alloy layer and between the F/-At alloy layer and the metal tube base is strong, and it resists erosion and abrasion after pouring, as well as heat resistance during casting. There is no risk of self-destruction due to impact or the difference in heat j1 expansion rate of each layer, and a sufficient safety function can be achieved.

Outermost S corner of F@-At alloy layer formed on metal tube A2.
0. At111j [is important] on the side in contact with the coating, and if it is less than 1s weight, dense Az,
o. It is undesirable because a film is not formed and it melts away. Also, if the ht concentration is 35% by weight or more, the alloy layer becomes hard and brittle and cannot withstand the thermal shock of the molten metal, so it melts away. I don't like it because it stows away. Furthermore, if the thickness of the alloy layer of Fe-me is less than 0.1 m, it is not suitable for practical use;
．． If it is thicker than 0[11, it becomes hard and brittle, resulting in a decrease in strength and is not preferred as a sprue system pipe. Therefore, as mentioned above, the outermost At1llll & Fi15~ of the F・-M alloy layer
35 It is necessary to maintain the amount of electricity in the range of 0.1 to 1.0M during heavy winters.

Among various types of steel pipes, steel pipes made from carbon steel, alloy steel, stainless steel, and heat-resistant steel are preferably used as the metal pipe in the present invention. In addition to carbon steel pipes, as alloy steel pipes, alloy steel pipes for piping such as 5TPA12.22 and structural alloy copper pipes such as 8TK81.2 are similarly used according to JIS. Also, as a stainless steel pipe, for example, 8U
Stainless steel pipe for piping such as S304, 8TK85.6
041I stainless steel pipes are preferable, and J
It is also possible to use a steel pipe made in the form of a heat-resistant cast steel such as IS 5cH1l, 12, etc. The cross-sectional shape of the metal tube used in the present invention is not circular but may be arbitrarily selected, such as an ellipse.

The metal sprue system pipe according to the present invention can be applied not only to casting molds such as rollers and casting pot wheels described later, but also as sprue thread pipes for ingot making.

As mentioned above, the metal 1R111I port system pipe according to the present invention is not a fool, as it can prevent the molten metal flow O carburization phenomenon during injection of molten metal, and prevent damage to the metal pipe O#1 or damage due to thermal shock.
Unlike ceramic pipes such as Yachamotte pipes, they do not break during transportation or during use, and can prevent the occurrence of defective castings due to inclusions such as sand. In addition, the degree of freedom in the modeling work is increased, it is possible to integrate long objects into one piece, and there is no need to add parts.Nanatsu F is extremely easy, so the number of manufacturing steps is reduced, and casting It has many excellent effects on workability and economy, such as effective use of sand and reduction of manufacturing costs due to the reuse of materials used.

The following ratio q4@ will be compared in detail with the drawing and the conventional one.

Figure 1 is an example of a nine-roll casting mold using a conventional ceramic tube. 9 molten metal is poured into sprue 2, sprue bottom 2/,
The runners are introduced into the mold bodies 3, 3' via the weir 2''.The sprue 2 and the sprue bottom 2' have 8 straight ceramic pipes 4 and 8 J-shaped ceramic pipes 4'. It is made by patching,
These are usually housed in a heavy-duty metal frame 5.5', and the middle part is hardened with sand mixed with a binder (usually called sand) 6, but during this ramming, the ceramics at the joints are hardened. The pipes are easily misaligned and damaged, and due to ramming and handling, the metal frame cannot be made into a single long piece, which requires a lot of man-hours. The runner 2# and weir 2# parts are made of ceramic pipes. If so, there is a risk of damage during ramming, the shape of this part is particularly important in terms of the casting plan, but ceramic tubes are difficult to process and the degree of freedom is small, and fragments will be mixed into the sand 6' during disassembly. To prevent the quality of the sand from decreasing, the sand is shaped and coated with a coating material, but washing and scooping are still likely to occur.

Atsushi 2 #1 IJK Example 1 showing the idea of the present invention and 411 details
This figure shows a sprue system pipe for a casting mold. In the figure, the sprue system pipe is a long, straight metal sprue system pipe 7 that constitutes the sprue 2, and a five-shaped metal sprue that integrally constitutes the sprue bottom 2I, runner 2', @2''. The metal sprue system pipe 7 is reinforced by a heavy reinforcing iron pipe 8, and the -15-shaped metal sprue system pipe 7' is inserted into the sand 6'. Therefore, in this case, the sprue 2 of the present invention, as shown in FIG. There is no need to use backing sand to fix the surrounding area at all.

That is, as mentioned above, the scissorbara seishitofuzensenho 4 and the lift mouth tube 7 made of metal sprue system pipes are not likely to be damaged by thermal shock or melted due to erosion, so they are usually placed in the lining sand for this purpose. There is no need to use a thick heavy metal frame. However, due to the high heat of the molten metal, the metal sprue system pipe 7 also becomes high temperature and there is a risk of deformation due to a decrease in p1 strength, so some reinforcing material such as a steel pipe 8 may be provided to reinforce this. In this case, if the structure is such that a barrier 9 is provided between the metal sprue system pipe 7 and the steel pipe 8 to the extent that the two can be separated during disassembly, the steel pipe 8 can be used repeatedly. Although not shown in the drawing, gaps may be provided between the metal sprue system pipe 7 and the reinforcing steel pipe 80 at the upper and lower parts of the sprue, if necessary.

Of course, in the case of a small casting with a short casting time or a short sprue length, it is also possible to configure the sprue 2 without the wire reinforcing steel pipe 8, and in this case it is rationalized.

That is, the sprue system pipe for casting molds of the present invention takes into account the conventional wisdom that backing sand is always used to construct the sprue, and realizes the ideals of those skilled in the art.

As a result, it is possible to prevent the occurrence of defective castings caused by damage and melting of ceramic pipes and washing of sand, which were problems with conventional methods.
The adoption of a long piece and the abolition of the thick-walled heavy metal frame with backing simplifies the molding work, ie reduces the number of molding man-hours.

In addition, the metal sprue thread pipe can be cut to a size of J4, and can also be bent by heating with a gas burner or the like. It also improves visual accuracy during machine building work, such as when assembling beans, so it is possible to install a tKil path, etc., in a more convenient manner.

Historically, *m* materials need to be crushed like traditional ceramic pipes or Shaminet pipes! Since it can be reused as an iron source together with the sprue system that is already cast, it not only saves man-hours and resources, but also eliminates the mixing of crushed debris into the foundry sand, which reduces the quality of the sand.41 It has many advantages such as:

The configuration and effects of the present invention will now be explained with reference to examples, and embodiments h2 and 3 are shown in FIG. 3 and summary 4, respectively, as other embodiments.

Fig. 1j43 shows another application of the present invention in the case of casting a relatively large-sized mold. Not included #l
O is filled to compensate for the lack of stiffness of the sprue system pipe 7 at high temperatures. In Komu, the sprue system pipe is a 7.5-shaped metal sprue system pipe 71. #! is made up of metal sprue system pipe 7''. In the figure, 11 and IP are the 5-shaped metal sprue system pipe 7', metal sprue system pipe 7, metal 1III sprue system pipe 7 and socket 1, respectively. It is a connecting refractory molded product that also serves as a spacer between the m-strength steel pipe 8 and the metal sprue system pipe 7.Thereby, the sand 10 does not need to be solidified with a binder, and the quality of the sand does not have to be an issue. Since there is no waste sand or beach sand, etc., it can serve as reinforcement simply by pouring it from the upper part of the chamber. This reduces the number of man-hours required for transporting heavy objects, handling compost, etc., and significantly reduces the cost of l-shaped molding.

Thus, when the metal sprue system pipe made of AA diffusion coating of the present invention is used, normally there is no need to use backing sand at all as in the case of Fig. 2; The present invention is not limited to this, and the case where this is used as shown in FIG. 3 is also included within the scope.

However, in the present invention, even when backing sand is used, as mentioned above, it does not contain a binder and there is no need to ask about the quality of the sand, which is 0 and is superior to the conventional case.

[Figure 4 shows nine metal sprue system pipes of the present invention used in a casting mold for a cast copper wheel. In the figure, the upper ff115 is equipped with a metal sprue system pipe 13 made of At diffuser type, and the lower part is a single-shaped sprue system pipe 13I made of gold 114.7.17
'Medium KWi installed metal l1lfIIO system pipe 1! , 12'
Form friends. Note that 14 is the wheel body.

This solves problems such as breakage during molding, sand contamination due to sand from castings, and debris from disassembly caused by conventional shatter pipes and Ipffi.

Above, we have mainly described embodiments using the metal sprue system pipe of the present invention as a mold, but the shapes of castings are complex and diverse.
If it is not possible to form an ideal hot water, etc., the strength of the foundry sand will not only be affected, but it will also be washed out and may not be suitable for practical use. By considering the arbitrary shape of the cast material covered with At diffusion only in the part where such a harsh mission is carried out, washing of the sand is completely prevented and there is no risk of damage. It became possible to obtain a casting company with ideal runners, etc.

The above figure shows a casting mold using the metal sprue system pipe of the present invention.
Based on 龜@t, 9, examples thereof are shown below.

Example 1 A cast iron roll was cast using the metal sprue system pipe of the present invention in the rolling roll casting mold shown in FIG. The casting conditions are shown below.

As-cast dimensions of the roll body: 540nm in straight line, 1370n in length
Amount of injected hot water: 3,630 kg Molten metal chemical composition (weight -): CSi Mn
Pl, 280.900. 40.080 8 Ni Cr M.

O, 0272, 580, 970, 10 Injection temperature f: x, ssow', Injection time: 2 minutes 01 seconds Treated O metal lifting port system pipe; Outer diameter @ 0.5 mm, thickness 2.3 mm outer steel pipe: Outer diameter 76.3m Wall thickness 4.5 strokes F・-At
Forming an alloy layer The O coating process is performed by adding 29 grams of F.-At alloy powder to AA, 50 grams of F.-A4 alloy powder, and a small amount of penetration enhancer. (8TK (Incorporated)) was placed in a cylindrical device and a nine iron box was held at 10001 for 18 hours for processing. The Fe-A4 alloy layer 0m2*1 on the surface was 33% by weight, and the thickness of the F alloy layer was O.Smn.

This was deposited and heated in another furnace at 10,001 for 2 hours until it reached a temperature of 1.0. Although a film was formed, the microscopic results showed At,
0. The thickness of the coating was 1.5 μm.

After the casting was cooled, the mold was dismantled and the sprue was cut and inspected. ! As shown in Figure 5, all parts were thoroughly drilled), and no melt damage or leakage was observed.

Gold Il of the present invention! By applying the manufactured-rotation type pipe to the casting mold, it is possible to avoid the trapping of inclusions such as sand, which is the same as in the conventional type 1i, and to reduce the cost due to the number of man-hours required for the conventional method.
K decreases to 9.

Example 2 Nine pieces of adamite casting molds were cast using a metal sprue system pipe of 0** light as a casting mold according to the following casting conditions as shown in FIG. This roll also has conventional wire connection 11
As shown in 11, the sprue system pipe was constructed horizontally using a ceramic pipe 4.41 and sand 61 and a nine cast lid was used, but in this embodiment, the sprue system pipe 7.7' was made of metal.

It was constructed and cast using 7I'.

Casting conditions Roll 1jI4s As-cast dimensions: Immediately after 4781 length ii 14
00mm pouring molten metal amount: 3JGOkg custom hot water chemical composition 0I skin): C81h4n Pl
, 720,680.800.019 8 NI Cr M.

0.0G80.681.060.21 Injection temperature f: 1.44o Injection time: 2 minutes 20 seconds Processed metal sprue system pipe: Outer diameter 63.5am, wall thickness 3.2mr
The coating process for forming the F/-At alloy layer was performed using μ4% by weight of Fe-AJK powder containing ZSO powder, and 26% by weight of permeation agent containing a small amount of permeation enhancer in Fe powder. Alloy steel pipes (8TPA24) were surrounded and buried inside the box, and the Kyutetsu box was maintained at 980 V for 16 hours for treatment.

The At concentration of the F·-At alloy layer on the surface of the metal sprue system pipe in contact with the molten metal is 20% by weight, and the thickness of the Fe-At alloy layer is 9%.
It was 3 nm. Take this out and put it in another furnace for 10001
+ for 1 hour to form an Aj*Oa film;
A microscopic examination revealed that the thickness of the At10m coating was 1. After cooling the casting, we dismantled it and investigated. As a result, there was no damage to the treated sprue system pipes, and the casting rolls were also silver-gold. Ta. Furthermore, since there is no quality deterioration of the foundry sand due to the mixing of ceramic pipe fragments during dismantling, the sand can be effectively recycled and the cost due to the number of man-hours required for making the lid is reduced to approximately IAK compared to the conventional method.

Example 3 An example in which cast copper 43-rule was cast using the metal casting IIK of the present invention shown in FIG. 4 will be described below.

The casting conditions are as follows.

As-cast dimensions outside the wheel: Outside & 8 SOmIll! OOmn
Wall thickness: 70mh Amount of injected camellia: 41 $2 kti; Molten semi-molten bar weight -): CgllvlnPO, 190,
481,04G, 023 8 Ni Or M.

O,01! ! 0.13 0.06 0.05 Injection temperature f: 1,550m Injection time = 38 seconds Treated - Russian pipe: Outside @ 48Jrm, thickness 2.3mm, coated with F/-U alloy layer formation 126 A common steel pipe (8TK 41 ) surrounded by a salt-shaped round iron box T105Gtl
A friend who maintains and processes 2G customs. Metal sprue system pipe 011H
The oht chain degree of the F--M L alloy layer on the surface to be IKII is 26% by weight, and the thickness 1 of the F--At alloy layer is O, 82 mm. The surface OAt*Oa coating of the F.-corrected alloy layer was found by microscopic examination to have a thickness of 0.3μ in six pieces.

After cooling the casting, we investigated and found that both the wheel body and the sprue tube, which had undergone diffusion treatment, were silver and gold, and the thickness and 0° coating were 13.
It was confirmed that μ is b, and it became clear that the present invention can also be applied to the cast noodle casting ffi for pipe-line cast steel in the sprue system.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a nine-roll casting lid with a sprue system pipe constructed using the conventional method, and Fig. 2 is a cross-sectional view of a roll casting lid in which the metal sprue system pipe of the present invention in Example 1 is applied. 3 figures are the same,
<Ovir side view of a roll casting mold to which the metal sprue system pipe of the present invention of Example 2 is applied, FIG. 4 is a sectional view of a wheel casting mold to which the metal sprue system pipe of the present invention of Example 3 is applied , FIG. 5 is a photograph showing the cross-sectional state of the sprue part after casting cooling according to Example 141C. Figure 6 (a) is a photograph showing the state of melting after using a conventional ceramic pipe sprue; This is a photograph showing a cross section of the sprue. l-Socket, 2.12-Gate, 2'-Gate bottom, 2', 7"
, 12'-runner, 2#--weir, 3, 3I-^ installation body, 4
, 4'-Ceramic tube, s, s', -Gold frame, 6.6'. 17, 17'-Sand, 7.7', 13, 13'-Metal sprue system pipe, 8-Reinforcing steel pipe, Between 9-111, l〇-Sand without binder, 11, 11'-・Spacer piece, 14
-・Wheel body, 15--upper mold, 16--lower mold. 3'- One helmet 5 Diagram line 7 Draft procedure amendment (method) In August 1981, Kazuo Wakasugi, a Japanese government official, infringed Patent Application No. 68280 of 1983, entitled Bottle sprue system pipe. Relationship Patent applicant (…) @Ritsumeikan Corporation (1 person) 8. Contents of amendment (1) ``Photograph showing the state'' on page 6, line 9 of the specification is changed to ``photograph showing the metallographic structure of the state.'' correct. (2) In the specification, page 11 and line 12 of ``Photographs'' are both ``
I corrected it to ``Explanatory diagram''. (3) Drawing 1iR6 (a), Figure 6 (b) Correct 25KiT of M by V. 9. Corrected drawings of attached documents 1 copy Figure 6 (0) Figure 6 (b) Procedural amendments Arrived in August 1929 by the Commissioner of the Japan Patent Office Kazuo Sugi 1. Indication of the case Patent application No. 68280 of 1939 No. 2, Name of the invention Metal layer sprue system pipe 3, Person making the amendment Relationship to the case Patent applicant (...) A-Bun Metal Co., Ltd. (1 person) 7. Subject of the amendment 8, Details of the amendment Page 4 of the book, lines 6-11, ``You can see that...'' is corrected as follows. ``The appearance is as shown in Figure 6 (a). 18 is solidified sprue metal, 19 is a ceramic pipe used as a sprue system pipe, and a part of this ceramic pipe has peeled off into fragments and powder. The white spots 4 scattered on the solidified sprue metal 18 indicate that a part of the inner surface of the ceramic tube 190 has melted and adhered to the sprue metal 18.
22 shows the misalignment that occurs when the tubes are added, and is further shown in FIG. In this way, ceramic pipes do not break or leak during pouring of molten metal, but they are prone to melting and slipping.

Claims (1)

[Claims] 1. A surface A t on at least the side of the metal tube in contact with the molten metal;
0. Form a coating and an alloy layer of 9F.
Gold 11# characterized by having a plating layer thickness of 0.1 to 1.0 mm! Sprue system pipe. 2 The metal tube is made of charcoal 1A1111, alloy steel, stainless steel or heat-resistant steel and is a copper tube.Claim Ii1
*Metal sprue system pipe as described.