JPH09295167A - Production of clad material of copper alloy and steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a clad material of hardly having a restriction on the dimension by heating a copper alloy raw material charged in a vessel of steel higher than the temperature of generating the liquid phase in the raw material, joining the heated copper alloy with the steel composed of a part of the vessel and making them as one body. SOLUTION: An uniform mixture of an alloy powder mixture 1 blended with bronze powder and brass powder and a dry borax anhydride is arranged on a bottom plate 2 of a box of soft steel, a graphite powder is scattered on the upper in a degree of without being exposed of the alloy powder and a graphite coating layer 6 is made, and the surface of the copper alloy powder is coated. Then, a soft steel lid 4 installed with a small hole 7 is mounted, and these are assembled with a welding part 5 spot-welded on a part of the circumference to side plates 3A, 3B with shielded arc welding. This is placed inside an electric furnace, after heating, melting, then cooling, further taking out outside the furnace and it is air cooled naturally. The obtained clad plate is formed with the copper alloy layer on the soft steel bottom plate as the base material and it has a sound joining state without defects of blow holes, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a clad material of a copper alloy and steel used in a portion requiring corrosion resistance, seizure resistance and wear resistance.

[0002]

2. Description of the Related Art Conventionally, copper alloys have been used in parts requiring corrosion resistance, seizure resistance, and wear resistance because of their inherent chemical stability, but they lack mechanical strength as mechanical parts. Therefore, it is often used as a composite material joined to a high-strength material typified by steel, and in particular, a clad material laminated on steel has been considered useful.

This clad material is subjected to a melt-bonding method such as overlay welding, casting, casting, non-melt bonding method such as rolling bonding, explosive bonding, diffusion bonding, and semi-melt bonding method such as sintering and thermal spraying. Has been manufactured.

However, each has the following disadvantages.

In the case of overlay welding, which is a fusion bonding method, the amount of deposited metal per unit time is limited, and in the case of a clad material having a large area, the production efficiency is extremely low, and the welding skill is high. Is required.

Further, since casting and casting are construction works involving holding and transporting a high-temperature molten metal, the equipment and facilities for manufacturing become large, and the manufacturing cost also increases.

Further, in the fusion bonding method, the molten metal temperature is set high in order to promote the flowability and wettability of the molten metal, which may cause changes in the alloy composition and deterioration in shape such as bending after construction. .

Further, Japanese Unexamined Patent Publication No. 57-94481 discloses a method for producing a composite metal material in which a flux is placed on the upper surface of a laminated material on a base material and melted and diffused. However, the heating atmosphere is a non-oxidizing atmosphere. It is a manufacturing method that requires atmosphere control and requires a rolling process to improve the bonding strength.

Further, in the case of rolling joining which is a non-melt joining method, the production combination of raw materials is complicated, the degree of freedom in size and shape is low, and diffusion joining requires low atmosphere control such as vacuum, so that the production efficiency is low. The manufacturing cost also increases.

Further, in the case of explosive bonding, since it is a batch production method, the manufacturing cost is high, the applicable material combination is narrow, and it is difficult to apply it to a product having a small thickness. There is.

The clad material is manufactured by sintering, which is a semi-melt joining method, even in a continuous production system, but it is mainly applied to relatively small parts and thin clad material, and the degree of freedom in dimension is high. However, the production cost is high because special dedicated equipment is required to control the atmosphere in the sintering process. Furthermore, in the case of sintering and spraying,
Bonding strength to the backing metal such as steel tends to be lower than other bonding methods.

[0012]

The problem to be solved by the present invention is to eliminate the drawbacks in the production of the conventional clad material of copper alloy and steel, and the copper alloy has few dimensional restrictions. It is to obtain a means for easily and inexpensively producing a clad material of steel and steel.

[0013]

The present invention utilizes a difference in melting point between a copper alloy and steel to put a copper alloy raw material in a steel container and to produce a liquid phase in at least a part of the copper alloy at a temperature not lower than a temperature. Based on the knowledge that it is possible to integrally bond by heating in an electric furnace, a gas furnace and a high frequency heating furnace,
I solved the problem.

Specifically, the raw material to be a copper alloy and the material that absorbs, consumes, or blocks oxygen in the air and oxides on the surface of the material can flow out of the container as the gas in the container heats. Enclose a part of any shape with a gap or small holes in a container made of steel,
It is characterized in that at least a part of a raw material to be a copper alloy is heated to a temperature at which a liquid phase is generated or higher to integrally join the copper alloy and the steel forming a part of the container.

Another feature is that a raw material to be a copper alloy is placed in a steel container having an arbitrary shape, and a liquid phase is generated in at least a part of the raw material to be a copper alloy in a reducing or vacuum atmosphere. It is to heat above the temperature to integrally join the copper alloy and the steel forming a part of the container.

A material that absorbs, consumes, or blocks oxygen in the air and the oxide on the surface of the material reacts with the residual oxygen in the voids in the container and between the raw materials and the oxide on the surface of the raw material to form an oxide or a complex oxide. To form an inactive or reducing atmosphere, and the reducing atmosphere cleans the inner surface of the container and the surface of the copper alloy raw material.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION As a raw material to be a copper alloy for the combination of materials applicable to the present invention, there is no particular limitation as long as it is a copper alloy which can be melted under normal conditions. It is also applicable to phosphor bronze and lead bronze, which have poor properties.

Further, as a raw material to be a copper alloy, it is preferable to use a plate-like, rod-like or block-like lump having an alloy composition of the copper alloy, various alloy powders or a mixture of pure metal powders. You can

Further, as the steel, generally-used steel containing iron as a main component such as ordinary carbon steel, alloy steel or stainless steel is used.

Furthermore, as a material for absorbing, consuming or blocking residual oxygen and oxides in the container and on the surface of the raw material, carbon or a carbon compound, or a basic flux having a melting point lower than that of a copper alloy can be used.

By using a material that absorbs, consumes or blocks residual oxygen and oxides, the steel container does not have to have an airtight structure, and a normal welded structure is sufficient.

That is, when a copper alloy is used, if a trace amount of carbon or a carbon compound is present in the container, it is about 4
At temperatures above 00 ° C, it reacts with the residual oxygen in the container to form carbon dioxide and carbon monoxide, and becomes an inert or reducing gas. It has the effect of reducing oxides on the inner surface of the container that contains it, and there is no reactivity between carbon or carbon compounds and copper alloys, and even if they are entrained, carbon or carbon compounds float due to the difference in specific gravity in the liquid phase, and copper Separated from alloy.

When a basic flux having a melting point lower than that of the copper alloy is used, the flux melts and flows at a temperature lower than that of the copper alloy, and the flux of the inner surface of the container including the copper alloy surface including the bonding interface and the base metal surface is used. The oxide is dissolved and removed by a liquid-solid reaction to form a clean copper alloy surface. The flux obtained by melting the oxide becomes slag, but this slag has no reactivity with the copper alloy and floats and separates in the liquid phase due to the difference in specific gravity.

The use of the granular material as the copper alloy allows the raw materials to be blended in an arbitrary composition and can be closely adhered to the surface of the complex base material without any gaps. Is especially preferred for the practice of the present invention.

When using the granular material as the copper alloy, the carbon, the carbon compound, and the flux described above are uniformly added to and mixed with the copper alloy raw material in the step of adjusting the alloy composition. Oxygen or oxides remaining on the surface of the granular material including inter-particle voids and bonding interface are removed, resulting in voids with less gas content and a clean granular surface, and blowholes even when using the granular material It is possible to prevent the occurrence of.

However, if the amount added is less than 0.1%, the effect of removing residual oxygen and oxides cannot be obtained, and
On the other hand, if the content exceeds 2.0% by weight, excessive generation of oxides is promoted, which may cause defects such as blowholes. Therefore, the addition amount is in the range of 0.1 to 2.0% by weight. Is preferred.

However, the addition amount depends on the material used, and is, for example, 0.1 to 0.5% by weight when borax is used as the flux and 0.5 to 1% by weight when graphite is used.
A preferable range is 0% by weight. In this case, even if the flux and graphite are added in combination, the effect is exhibited if the total amount is within the above range.

Further, in order to prevent oxidation in the container, a minute amount of carbon or a carbon compound is placed in the container and reacted with residual oxygen for consumption, or the inside of the container is replaced with a nitrogen atmosphere having low reactivity. Alternatively, the slag layer can be formed by spraying a basic flux having a melting point lower than that of the copper alloy into the container so that the copper alloy is not exposed on the outermost surface.

When the copper alloy contains a composition component having a high vapor pressure, such as zinc, phosphorus or lead, the copper alloy surface is coated with carbon or a carbon compound and a flux to prevent evaporation into the atmosphere. This also has the effect of improving the component yield.

In any case, the container does not necessarily have to be sufficiently airtight, and an ordinary welding structure such as arc welding is sufficient, and the container structure has the shape of the joining material as the final product. Any structure may be used as long as it can prevent an excessive inflow of air from the outside. At this time, in order to prevent the gas generated in the container from increasing in pressure and expanding due to a rise in temperature, a gap or a small hole is formed in the container to release the gas. In this case, it is sufficient that the gap is about the overlapped gap without welding the structural members. If the small hole is too large, the air flows in reversely, so that the diameter of about 2 mm is sufficient.

Further, if relatively good adhesion can be obtained, it is only necessary to place a ceramic such as alumina, which is a heat-resistant material, as a lid on the upper surface of the steel container, and the container is hermetically sealed against an inert or reducing atmosphere. And the air permeability for letting out the gas inside the container are appropriately maintained, and a good clad material can be manufactured. However, when using a low-strength, thin-thick metal lid, unless it is fixed to the side material by welding, excessive deformation occurs during high-temperature processing, and appropriate airtightness is maintained. There may not be.

Further, when integrally joining using a reducing atmosphere furnace or a vacuum furnace, it is not necessary to provide a container in particular, and a bottom plate serving as a base material when integrated and a side wall for holding a molten copper alloy. If there is

Furthermore, when integrally joining using a normal atmospheric furnace, the copper alloy may be vacuum sealed in a steel container having an airtight structure.

In this case, the copper alloy raw material is not limited in shape and size as long as the composition of the predetermined copper alloy is obtained after the construction, and plate-like and block-like lumps, granules and powders, and linear particles. Also, rod-shaped rods and wire rods can be used, and a mixture obtained by mixing these in appropriate proportions can also be used. The raw material size may be any size that can be charged into the container, and the raw material of the plate-shaped and block-shaped lumps may be cut into an appropriate size and shape before use.

The wire rods and rod-shaped rods may be cut into a suitable length and aligned on the base steel.
When cut into lengths several times the wire diameter, mixing and component adjustment are easy when used in combination with other materials.

In this case, the granular or powdery granular material is also very useful as a copper alloy raw material, and is excellent in workability such as mixing and controllability such as component adjustment. The particle size distribution and shape can be freely selected, and the copper alloy layer can be arranged at any position and in any shape. The composition of the copper alloy can also be adjusted freely, and if atomized powder solidified by quenching is used, copper alloys with components and compositions that cannot be obtained by the usual melting method can also be used, thus increasing the degree of freedom in selecting the copper alloy. .

Heating above the temperature at which a liquid phase is generated in a part of the copper alloy raw material makes the inside of the container a reducing or vacuum atmosphere even if the outside of the container is an air atmosphere, and the solidus temperature is set under this atmosphere. The copper alloy and the steel forming a part of the container are integrally joined by heating to the temperature range not lower than the liquidus temperature + 100 ° C. If the heating temperature is below the solidus temperature, metallurgical bonding with the steel that forms a part of the container does not occur, and if heating is performed above the solidus temperature + 100 ° C, it becomes a copper container that is the main component of the copper alloy. Grain boundary infiltration of steel and excessive reaction such as dilution of copper alloy with iron, which is the main component of steel that constitutes a part of the container, and yield decrease due to evaporation of copper alloy components, etc., and sound integral joining cannot be performed. .

If the base steel constitutes a part of the container,
For example, in the case of a square box-shaped container, the bottom plate becomes the base material,
In the case of a cylindrical container, if the pipe is assembled so as to be the base material, the structure of the container is simple, so that the container manufacturing process is simple and the manufacturing cost is low. Steel that is the base material may be placed in a separately assembled container. In this case, the material of the container may be made of a heat-resistant material such as ceramic instead of steel, and is wider than when it constitutes a part of the container. It can be selected, and the container can be reused by selecting the material. Therefore, the container may be made of a heat-resistant material such as ceramic.However, since the container is vulnerable to thermal shock and the production cost is high, if the container has a structure in which only the inner surface of the container is lined with a heat-resistant material or a part is made of a heat-resistant material, It is also possible to reuse repeatedly, and it is possible to omit the container manufacturing process and reduce the cost.

However, when arranging steel in the container, it is necessary to prevent the raw material state and the molten state copper alloy from invading the gap between the container and the container. Becomes difficult to separate. In other words, steel may be spot-welded to a part of the container, a fixing jig may be installed, a heat-resistant adhesive may be used for fixing, or heat-resistant powder that does not react with the copper alloy may be filled in the gap.

The selection of the container shape is determined by the shape of the clad material to be manufactured. In the case of a plate-shaped clad material, a box-shaped container using the bottom plate as a base material, and in the case of a pipe-shaped clad material, a pipe that is a side wall is selected. As a base material, a clad material having an arbitrary shape can be obtained by arranging a core in a pipe as necessary and assembling a tubular container.

Further, in the present invention, by setting the heating temperature in the solid phase-liquid phase coexistence region, the copper having a structure in which the structure of the copper alloy layer is appropriately dispersed with voids different from the original melt-cast structure It is also possible to manufacture a clad material in which the alloy layer and the steel are integrally joined. In other words, by setting the heating temperature to the solidus temperature or higher and the liquidus temperature + 50 ° C or lower, the copper alloy material is in a solid phase-liquid phase coexisting state in which the solid phase and the liquid phase are mixed, and the copper alloy material is retained for an appropriate time. Then, if cooled to a temperature below the solidus temperature, it becomes possible to form a copper alloy layer having a structural structure that preserves the solid-liquid coexistence state.

In this case, if the proportion of the solid phase portion in the solid phase-liquid phase coexisting state is too large, the copper alloy layer cannot maintain its shape and good joint strength with steel cannot be obtained, so that the voids are not formed. Needs to be formed in a proper size and distribution form. In order to control the size and distribution of the voids, it is appropriate to use a copper alloy raw material of the granular material, and to adjust the shape and the particle size of the granular material so that the voids have an appropriate size and distribution form. It is possible to control.

The voids formed in the copper alloy layer with an appropriate size and distribution have a function as a place for holding and storing the lubricating oil when used as a liner, and are formed by the powder sintering method. It is expected to play the same role as the inter-powder voids of oil-impregnated bearings.

[0044]

【Example】

Example 1 Examples 1 to 3 are examples in which copper alloy powder, which is a granular material, is used as a copper alloy raw material.

Width 720 mm and length 1250 m shown in FIG.
Covering the bottom plate 2 and the side plates 3A, 3B of m, height 70 mm (inner size) made of mild steel (SS400) box (9 mm plate thickness of the lid 7 and the side plates 3A, 3B, 19 mm thickness of the bottom plate 2 serving as the base material) It was assembled by arc welding.

On the bottom plate 2 of this mild steel box, the particle size distribution is 1
Bronze powder BC2 (tin Using a V-type mixer, alloy powder mixture 1 of a total of 44.7 kg and 80 g of dried anhydrous borax were blended so as to be 7.2% by weight, 3.6% by weight of zinc, residual copper and unavoidable impurities). A uniformly mixed material was placed, and graphite powder having a particle size of 80 μm or less was sprinkled thereon to form a graphite coating layer 6 to coat the surface of the copper alloy powder. And diameter 2m
The mild steel plate lid 4 provided with one small hole 7 of m is placed on the side plate 3
Assembling was carried out at 8 welding parts 5 in which part of the circumference was spot-welded by A, 3B and covered arc welding.

This was placed in an electric furnace and kept at 200 ° C / Hr.
After heating at 900 ° C for 2 hours and holding at 1050 ° C
After being held for 4 more hours and melted, it was cooled to 800 ° C at 200 ° C / Hr, and then further pulled out of the furnace and air-cooled.

The obtained clad plate has a thickness of 1
A 6 mm-thick copper alloy layer is formed on a 9 mm mild steel bottom plate 2, defects such as blow holes are not observed, and the base material and the copper alloy layer have a sound bonding state over the entire surface. there were.

Further, the obtained copper alloy layer had a composition of 9.0 wt% tin, 3.0 wt% zinc, residual copper and unavoidable impurities, and the hardness of the copper alloy layer was Vickers hardness Hv90-.
At 110, the shear strength determined by collecting the shear strength test piece specified in JIS-G-0601 is shown in Table 1 together with the result in the case of combination with other copper alloys.
It was a value of mm ² or more, indicating that the bonding interface had sufficient bonding strength.

[0050]

[Table 1] Further, a side bending test piece (plate thickness: copper alloy layer 3 mm + steel base material 16 mm, width: 9.
5 mm, length: 150 mm) is sampled and the inner radius is 20
When a side bending test was performed using a pressing jig of mm and a roller type supporting jig, cracks did not occur near the interface even at a bending angle of about 90 degrees.

The appearance of the clad plate after the construction was a cast surface with slag and graphite floating on the outermost surface of the copper alloy, but these can be easily removed by ordinary machining and smoothed by machining finish. It could have been a surface.

Example 2 On the bottom plate 2 of a mild steel (SS400) box similar to that in Example 1, the same copper alloy powder raw material as in Example 1 was used, and bronze BC was used.
2 (tin 7.0% by weight, zinc 4.7% by weight, residual copper and unavoidable impurities) in total of 44.7 kg
Of the copper alloy powder mixture and 313 g of dried graphite powder having a particle size of 80 μm or less are uniformly mixed by using a V-type mixer, and the copper alloy powder having a particle size of 80 μm or less is exposed to the extent that the copper alloy powder is not exposed. Graphite powder is sprinkled to form the graphite coating layer 6,
The copper alloy powder surface was coated. Then, a mild steel plate lid 4 provided with one small hole having a diameter of 2 mm was placed, and the side plates 3A and 3B were assembled at eight welded portions by spot welding a part of the circumference by covered arc welding.

This was placed in an electric furnace and kept at 200 ° C / Hr.
After heating at 1050 ° C. for 6 hours to dissolve it, it was cooled to 800 ° C. at 200 ° C./Hr, and then further pulled out of the furnace and air-cooled.

The obtained clad plate has a thickness of 1
A 6 mm-thick copper alloy layer was formed on a 9 mm mild steel bottom plate, defects such as blow holes were not observed, and the base material and the copper alloy layer were soundly joined over the entire surface.

Further, the obtained copper alloy layer had a composition of tin 7.4% by weight, zinc 4.2% by weight, residual copper and inevitable impurities, and the hardness of the copper alloy layer was Hv 90 to 110, and the copper alloy Shear strength at the bonding interface between the layer and the base metal is about 30 kgf
/ Mm ² showed sufficient bonding strength.

The appearance of the clad plate after construction was a cast surface with slag and graphite floating on the outermost surface of the copper alloy, but these can be easily removed by ordinary machining and smoothed by machining. It could be a surface.

Example 3 Outermost diameter 120 mm 1 Outermost diameter 50 mm 1 Height 1 shown in FIG.
Outer pipe 2A and inner side arranged concentrically with bottom plate 3 of a 00 mm cylindrical container made of mild steel (SS400) (thickness of outer pipe 2A as a base material is 10 mm, inner pipe 2B, bottom plate 2 and lid 4 is 5 mm) Pipe 2B was assembled by coated arc welding.

In the hollow pipe surrounded by the outer pipe 2A, the inner pipe 2B and the bottom plate 3 of the mild steel tubular container,
Using the same copper alloy powder raw material as in Example 1, bronze BC2
(1 wt% tin, 3.6 wt% zinc, residual copper and unavoidable impurities), a total of 1.65 kg of alloy powder mixture 1 and 11.2 g of dried graphite powder having a particle size of 80 μm or less. Was uniformly mixed using a V-type mixer, and a graphite powder having a particle size of 80 μm or less was sprinkled thereon to form a graphite coating layer 6, the surface of the copper alloy powder. Was coated. Then, only the lid 4 made of mild steel plate was placed, welding was not performed, and the container was assembled.

This was placed in an electric furnace, and 200 ° C / Hr
After heating at 1050 ° C for 4 hours to melt,
After cooling to 800 ° C at 200 ° C / Hr, it was further drawn out of the furnace and air-cooled.

If the inner pipe is removed by ordinary machining after the construction, a clad pipe in which the copper alloy and the steel are integrally joined can be obtained.

The obtained clad tube has a thickness of 1 as a base material.
A copper alloy layer having a thickness of about 20 mm was formed on the inner surface of a 0 mm mild steel pipe, defects such as blowholes were not observed, and the base material and the copper alloy layer were joined together soundly over the entire surface. .

FIG. 3 shows the cross-sectional arrangement of the raw material before melting when a graphite core is used instead of the inner pipe. Since the graphite core did not react with the copper alloy and could be easily separated, it could be reused, and the casting surface was smooth and the amount of cutting on the inner surface of the copper alloy was small.

Example 4 The shape is the same as the container shown in FIG. 1, but the dimensions are smaller, width 190 mm, length 260 mm, height 50 mm.
A bottom plate and a side plate of an (inner size) box made of mild steel (SS400) (cover and side plate thickness 5 mm, base plate thickness 9 mm) were assembled by covered arc welding.

On the bottom plate 3 of this mild steel box, bronze BC2 (tin 7.2) using the same copper alloy powder raw material as in Example 1.
Wt%, zinc weight 3.6%, residual copper and unavoidable impurities)
The alloy powder mixture 1 of 1.65 kg in total that was mixed so as to be uniformly mixed with 2.8 g of dried anhydrous borax was arranged, and the particle diameter was 80 μm or less so that the copper alloy powder was not exposed thereon. The graphite powder of was sprayed to form a graphite coating layer 6, and the surface of the copper alloy powder was coated. Then, only a lid made of mild steel plate was placed, welding was not performed, and the container was assembled.

This was placed in an electric furnace and kept at 200 ° C / Hr.
After heating at 1000 ° C. for 2 hours to melt it, it was cooled to 900 ° C. at 200 ° C./Hr, then further pulled out of the furnace and air-cooled.

FIG. 4 shows the cross-sectional arrangement of the raw material before melting, and FIG. 5 shows the cross-sectional condition of the clad plate in which the voids have been generated after melting.

The obtained clad plate had a thickness of 9 as a base material.
A copper alloy layer 9 having a thickness of 5 mm was formed on the bottom plate 3 made of mm of mild steel. This copper alloy layer 9 has voids 11 with a size of about 0.1 to 1.0 mm, which are uniformly distributed in macroscopic observation.
It was composed of a copper alloy layer 9A having a thickness of about 3 mm and a copper alloy layer 9B having a thickness of about 2 mm not containing voids 11. No defects were observed in the vicinity of the joining interface 10 between the copper alloy layer and the steel. Also in the shear test, the fracture position was the copper alloy layer 9, and it was determined that the interface was soundly joined.

The appearance of the clad plate after the construction was a cast surface with slag and graphite floating on the outermost surface of the copper alloy, but these can be easily removed by ordinary machining, and if a machining finish is performed. The voids with a size of about 0.1 to 1.0 mm observed in the macrostructure observation are the surfaces that are exposed almost uniformly on the entire surface of the copper alloy, and the voids opened on these surfaces serve as oil pools for lubricating oil. It is possible to have the function of.

[0069]

【The invention's effect】

(1) It is possible to manufacture a clad material of copper alloy and steel with less dimensional restrictions with a simple apparatus and construction method, while keeping the manufacturing cost low.

(2) Since the joining uses only the difference in melting point, any copper alloy that can be melted can be applied, and a clad material made of a wide range of combinations of copper alloy and steel can be manufactured.

(3) Since the joining is integrated by a metallurgical reaction, a clad material having excellent interfacial strength can be obtained.

[Brief description of drawings]

FIG. 1 shows a cross-sectional arrangement state of raw materials before melting when a clad plate is manufactured.

FIG. 2 shows a cross-sectional arrangement state of raw materials before melting when a clad pipe is manufactured using an inner pipe.

FIG. 3 shows a cross-sectional arrangement state of raw materials before melting when a clad tube is manufactured using a graphite core.

FIG. 4 shows a cross-sectional arrangement state of raw materials before melting.

FIG. 5 shows a cross-sectional situation of a clad plate in which controlled voids are generated.

[Explanation of symbols]

 1 Copper alloy powder mixture 2 Bottom plate (base material) 2A Outer pipe (base material) 2B Inner pipe 3 Bottom plate 3A, 3B Side plate 4 Lid 5 Welded portion 6 Graphite coating layer 7 Small hole 8 Core 9 Copper alloy layer 9A Including voids Copper alloy layer 9B Copper alloy layer not containing voids 10 Bonding interface 11 Voids

Claims (5)

[Claims] 1. A copper alloy raw material for forming a clad material and a material for shielding the copper alloy raw material from oxygen in an atmosphere are partially made of steel forming the same clad material, and air in a container is used. Is charged into a container with a gap that allows it to flow out of the container due to heating, and the copper alloy raw material charged into this steel container is heated to a temperature above the temperature at which a liquid phase is generated in at least a part of the copper alloy raw material. A method for producing a copper alloy and a steel clad material, which comprises heating and joining the heated copper alloy with steel constituting a part of a container to integrate them. 2. The copper alloy and the steel according to claim 1, wherein the material that blocks oxygen in the atmosphere is carbon, a carbon compound, or a basic flux having a melting point lower than that of the copper alloy. Method for manufacturing clad material. 3. A copper alloy raw material for forming a clad material is charged into a steel container, and the copper alloy raw material charged into the steel container is liquidized into at least a part of the copper alloy raw material under a non-oxidizing atmosphere. A method for producing a clad material of copper alloy and steel, comprising integrally heating a copper alloy and steel constituting a part of a container by heating to a temperature at which a phase occurs or higher. 4. The copper alloy raw material constituting the clad material according to claim 1 or 2, wherein the copper alloy raw material has a plate-like or block-like lump having a copper alloy composition forming the clad material, or a powdery or granular material. A method for producing a copper alloy and steel clad material, which is a powder or granular material, or a wire rod having a linear or rod shape. 5. A heating temperature at which a liquid phase is generated in at least a part of the copper alloy raw material, wherein the copper alloy raw material forming the clad material according to claim 4 is a granular material having a copper alloy composition forming the clad material. Above solidus temperature and liquidus temperature +50
A method for producing a copper alloy-steel clad material, characterized in that a copper alloy phase having controlled voids is generated at a temperature of ° C or less.