JP2003193158A - Electrode material for resistance welding and production method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a material which has excellent electrical conductivity, has improved mechanical properties such as tensile strength, an elongation percentage and hardness, and further has excellent heat resistance, excellent machinability, and is suitable as a high strength, high electrical conductive electrode material. <P>SOLUTION: The electrode material has a composition containing, by weight, 2.3 to 5.3% Ni, 0.25 to 0.8% Be, and 0.3 to 1.5% Cr, and the balance Cu with inevitable impurities. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode material for resistance welding and a method for manufacturing the same, and relates to mechanical properties and JIS Z 3234 No. 3 according to JIS Z3234 No. 4 type.
It seeks to obtain one with a seed conductivity.

[0002]

2. Description of the Related Art Conventionally, BeCu25 alloy of high beryllium copper has been used as an electrode material conforming to JIS Z 3234 Type 4 standard, which is a standard for resistance welding electrode materials. This alloy satisfies the mechanical and physical properties as a high-strength resistance welding electrode material, and also has good high-temperature hardness, heat resistance such as annealing hardness, and other material properties, It is still used today.

[0003]

However, since the above materials have high mechanical properties, it is difficult to machine them after aging treatment. Therefore, after the solution treatment, the roughing is first performed, and the finishing processing is performed after the aging treatment. The reason why the finishing process is performed after the aging treatment is that a problem of warpage or deformation due to thermal strain occurs during the aging treatment. Therefore, under the present circumstances, it is inevitable to carry out rough processing after solution treatment and finish processing after aging, resulting in double labor and poor work efficiency. Further, under severe operating conditions that require not only high strength but also higher conductivity, the conductivity of the BeCu25 alloy cannot satisfy the above requirement. Further, as is well known, since Be is an expensive raw material, it is required to manufacture an electrode material containing less Be than the BeCu25 alloy in order to reduce the cost.

Therefore, the inventor of the present invention has made JIS Z 323
4 Mechanical properties and JIS Z 3234 according to 4th type
Attempts were made to manufacture a high-strength, high-conductivity electrode material having a third-type conductivity at a low cost. In this attempt, Cu
Focusing on -Ni-Be-based copper alloys, several kinds of copper alloys were manufactured by changing the amount of Ni and the amount of Be, and the mechanical properties and the conductivity of each were tested. As a result, none of the copper alloys could satisfy the target values of tensile strength, elongation, hardness and conductivity.

In order to solve the above-mentioned problems, the present invention adds mechanical elements such as tensile strength, elongation and hardness, and conductivity by adding an additive element of Cr to the Cu-Ni-Be system copper alloy. The present invention aims to obtain a material having a high rate, excellent heat resistance, and excellent machinability, which is suitable for use as a high-strength, high-conductivity electrode material.
Furthermore, by adding Cr to a Cu-Ni-Be-based copper alloy, other additive elements are added to obtain an economical electrode material having more excellent mechanical properties and electrical conductivity.

In the present invention, JIS Z 323 is used.
4 Based on the 4th and 3rd standards, the target mechanical properties and conductivity standards are as follows. Tensile strength ＞ 850N / mm ² Elongation ＞ 5% Hardness (Rockwell hardness) ＞ 27HRC Conductivity ＞ 45IACS%

[0007]

In order to solve the above problems, the first invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt%
And the balance is Cu excluding unavoidable impurities.

The second invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Zr 0.05 to 0.5 wt%, and the balance being Cu excluding unavoidable impurities.

A third aspect of the present invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Nb 0.05 to 0.5 wt%, the balance being Cu excluding unavoidable impurities.

The fourth invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Co 0.2 to 0.9 wt%, and the balance being Cu excluding unavoidable impurities.

The fifth aspect of the present invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Fe 0.2 to 0.8 wt%, and the balance being Cu excluding unavoidable impurities.

A sixth aspect of the present invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Si 0.2 to 0.7 wt%, and the balance being Cu excluding unavoidable impurities.

The seventh aspect of the present invention is Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Sn 0.2 to 0.7 wt%, the balance being Cu excluding unavoidable impurities.

The eighth invention is a manufacturing method, wherein Ni2.3 is used.
~ 5.3wt%, Be0.25 ~ 0.8wt%, Cr0.3 ~
C containing 1.5 wt% and the balance excluding unavoidable impurities
A copper alloy made of u is treated at a solution treatment temperature of 900 ° C. to 990.
Solution treatment at ℃, then aging temperature 420 ~ 55
Aged at 0 ° C.

A ninth aspect of the present invention is a manufacturing method, wherein Ni2.3 is used.
~ 5.3wt%, Be0.25 ~ 0.8wt%, Cr0.3 ~
A copper alloy containing 1.5 wt% and Zr of 0.05 to 0.5 wt% and the balance of Cu excluding inevitable impurities is subjected to solution treatment at a solution treatment temperature of 900 ° C. to 990 ° C. The aging treatment was performed at an aging treatment temperature of 420 to 550 ° C.

A tenth aspect of the invention is a manufacturing method, wherein Ni2.
3 to 5.3 wt%, Be 0.25 to 0.8 wt%, Cr 0.3
.About.1.5 wt%, Nb 0.05 to 0.5 wt%, and the balance being a copper alloy made of Cu excluding inevitable impurities, subjected to solution treatment at a solution treatment temperature of 900.degree. C. to 990.degree. Is subjected to an aging treatment at an aging treatment temperature of 420 to 550 ° C.

The eleventh aspect of the present invention is a manufacturing method, wherein Ni2.
3 to 5.3 wt%, Be 0.25 to 0.8 wt%, Cr 0.3
-1.5 wt%, Co 0.2-0.9 wt%, the balance is a copper alloy made of Cu excluding unavoidable impurities, subjected to solution treatment at a solution treatment temperature 900 ℃ ~ 990 ℃, Is subjected to an aging treatment at an aging treatment temperature of 420 to 550 ° C.

The twelfth aspect of the invention is a manufacturing method, wherein Ni2.
3 to 5.3 wt%, Be 0.25 to 0.8 wt%, Cr 0.3
.About.1.5 wt%, Fe 0.2 to 0.8 wt%, the balance being a copper alloy made of Cu excluding inevitable impurities, subjected to solution treatment at a solution treatment temperature of 900.degree. Is subjected to an aging treatment at an aging treatment temperature of 420 to 550 ° C.

The thirteenth invention is a manufacturing method, wherein Ni2.
3 to 5.3 wt%, Be 0.25 to 0.8 wt%, Cr 0.3
.About.1.5 wt%, Si 0.2 to 0.7 wt%, the balance being Cu alloy made of Cu excluding unavoidable impurities, subjected to solution treatment at a solution treatment temperature of 900.degree. C. to 990.degree. Is subjected to an aging treatment at an aging treatment temperature of 420 to 550 ° C.

A fourteenth aspect of the invention is a manufacturing method, wherein Ni2.
3 to 5.3 wt%, Be 0.25 to 0.8 wt%, Cr 0.3
.About.1.5 wt%, Sn 0.2 to 0.7 wt%, and the balance being a copper alloy made of Cu excluding inevitable impurities, subjected to solution treatment at a solution treatment temperature of 900.degree. C. to 990.degree. Is subjected to an aging treatment at an aging treatment temperature of 420 to 550 ° C.

[0021]

The present invention is constructed as described above, and Cu-N
By adding Cr to the i-Be-based copper alloy, the J
IS Z 3234 Mechanical properties according to the 4th kind and J
IS Z 3234 It is possible to obtain a high-strength, high-conductivity copper alloy electrode material for resistance welding having a third-type conductivity. That is, as described in the prior art, Cu-Ni-B
Only the e-based copper alloy could not satisfy all of the tensile strength, elongation, hardness and conductivity. However, as in the present invention, by adding Cr and performing an appropriate heat treatment, precipitation strengthening with Cu is promoted, and an electrode material sufficiently satisfying both mechanical properties and conductivity can be obtained.

The element added to Cu is Ni2.3.
~ 5.3wt%, Be0.25 ~ 0.8wt%, Cr0.3 ~
Add at a blending ratio of 1.5 wt%. Explaining the addition amount and effect of each additive element, Ni is a basic additive element which is useful for melting with Cu and improving mechanical properties. If the amount added is less than 2.3 wt%, not only the formation of NiBe decreases, but also the solid solution strengthening by Ni decreases, and the mechanical properties of the target standard cannot be satisfied. On the contrary, if Ni is added in an amount of more than 5.3 wt%, the conductivity becomes poor. Therefore, Ni is 2.
Add at 3 to 5.3 wt%.

Next, Be becomes N by combining with Ni.
Form iBe. Therefore, the mechanical properties and heat resistance can be improved without lowering the conductivity. If the addition amount of Be is less than 0.25 wt%, the compounding with Ni is not carried out favorably and the mechanical properties cannot be improved. Moreover, the electrical conductivity suitable for use as an electrode material cannot be achieved. Further, when the amount of Be added is more than 0.8%, N
Since iBe is excessively formed, the copper alloy becomes brittle, elongation is reduced, and improvement in mechanical properties cannot be expected. Therefore, Be is added at 0.25% to 0.8 wt%.

Further, Cr dissolves in Cu and is subjected to heat treatment to promote precipitation strengthening. Cr and C
By strengthening the precipitation of u, the mechanical properties are improved and the electrical conductivity becomes excellent. That is, if the amount of Cr added is less than 0.3 wt%, sufficient precipitation strengthening does not occur and improvement in mechanical properties cannot be expected.

Further, when the material is melted by the economical atmospheric melting, an appropriate flux is added to improve the melting action. However, the amount of Cr added is 1.5 wt.
If it is more than 0.1%, Cr is coarsened, it does not contribute to precipitation strengthening, more slag is generated, and the yield of Cr addition is deteriorated, which is uneconomical. Also, because of these,
As a result, the mechanical properties of the material also deteriorate. Therefore, Cr is added at 0.3 to 1.5 wt%.

In addition, in the second to seventh inventions, as an additive element, an additive element which has higher mechanical properties and stability, is excellent in conductivity, and sufficiently satisfies the target standard with a small amount of additive element. I tried to find out. Then, as a result of experimenting various melting methods and heat treatment methods, it was found that Cu-Ni-Be
Z as an additive element to a copper alloy in which Cr is added to a copper alloy
Addition of any one of r, Nb, Co, Fe, Si, and Sn provides an electrode material with more stable mechanical properties and conductivity satisfying the target value as compared with the case of adding only Cr. I can do things.

The above additive elements are Ni 2.3 to 5.3 wt.
%, Be 0.25 to 0.8 wt%, Cr 0.3 to 1.5 wt
%, Zr 0.05 to 0.5 wt%, Nb 0.05 to 0.5 wt
%, Co 0.2 to 0.9 wt%, Fe 0.2 to 0.8 wt%,
One of the two is added to a copper alloy in which Cr is added to a Cu-Ni-Be-based copper alloy, with a compounding ratio of 0.2 to 0.7 wt% of Si and 0.2 to 0.7 wt% of Sn.

The above Zr is a material that dissolves in Cu and is subjected to heat treatment to promote precipitation strengthening. Zr combines with Cu to form Cu ₄ Zr, which does not reduce the conductivity and contributes to the improvement of mechanical properties. Also, this Zr
When the addition amount of is less than 0.05 wt%, sufficient precipitation strengthening does not occur. However, if it is more than 0.5 wt%, Zr becomes coarse and does not contribute to precipitation strengthening, and
It is uneconomical because the amount of slag increases and the yield of Zr addition deteriorates. These also result in poor mechanical properties of the material. Therefore, Zr is 0.05-
Add 0.5 wt%.

Similarly, Nb also dissolves in Cu and is subjected to heat treatment to promote precipitation strengthening. N
By b precipitation strengthening with Cu, b does not lower the conductivity and contributes to the improvement of mechanical properties. That is, when the amount of Nb added is less than 0.05 wt%, sufficient precipitation strengthening does not occur and the mechanical properties are not improved. However, 0.5 wt
When it is more than%, Nb is coarsened, it does not contribute to precipitation strengthening, more slag is generated, and the yield of Nb addition is deteriorated, which is uneconomical. Also, because of these,
As a result, the mechanical properties of the material also deteriorate. Therefore, Nb is added at 0.05 to 0.5 wt%.

Further, Co similarly promotes precipitation strengthening by being melted with Cu and subjected to heat treatment. C
By strengthening the precipitation of Cu with o, the conductivity of o does not decrease and contributes to the improvement of mechanical properties. That is, if the amount of Co added is less than 0.2 wt%, sufficient precipitation strengthening does not occur and the mechanical properties are not improved. However, 0.9 wt
When the content is more than%, Co coarsens, does not contribute to precipitation strengthening, increases the amount of slag, and deteriorates the addition yield of Co, which is uneconomical. Also, because of these,
As a result, the mechanical properties of the material also deteriorate. Therefore, it is preferable to determine the addition amount of Co at 0.2 to 0.9 wt%.

Similarly, Fe also promotes precipitation strengthening by being melted with Cu and subjected to heat treatment. F
By evaporating and strengthening with Cu, the e does not lower the conductivity and contributes to the improvement of mechanical properties. That is, if the addition amount of Fe is less than 0.2 wt%, sufficient precipitation strengthening does not occur and the mechanical properties are not improved. However, 0.8 wt
When the content is more than%, Fe coarsens, does not contribute to precipitation strengthening, causes more slag, and deteriorates the yield of addition of Fe, which is uneconomical. Also, because of these,
As a result, the mechanical properties of the material also deteriorate. Therefore, it is preferable to determine the addition amount of Fe at 0.2 to 0.8 wt%.

Si combines with Cr to form a chrome silicide. Therefore, the mechanical properties and heat resistance can be improved without reducing the conductivity. This S
If the addition amount of i is less than 0.2 wt%, the compounding with Cr is not carried out favorably and the mechanical properties cannot be improved. Moreover, the electrical conductivity suitable for use as an electrode material cannot be achieved. Further, when the amount of Si added is more than 0.7 wt%, not only is chromium silicide excessively formed, but
Since it forms a solid solution in the matrix, the conductivity decreases.
Therefore, Si needs to be added in an amount of 0.2 to 0.7 wt%.

Further, Sn dissolves in Cu and promotes solid solution strengthening. Sn does not drop the conductivity extremely,
It contributes to high temperature oxidation resistance and improvement of mechanical properties. That is, S
If the addition amount of n is less than 0.2 wt%, sufficient solid solution strengthening does not occur. However, when it is more than 0.7 wt%, the conductivity is remarkably lowered due to the solid solution of Sn. Therefore, it is necessary to add Sn at 0.2 to 0.7 wt%.

The additive element is preferably Ni2.
3 to 4.8 wt%, Be 0.25 to 0.70 wt%, Cr0.
It is added to Cu in a mixing ratio of 3 to 1.2 wt%. Also, N
i 2.3 to 4.8 wt%, Be 0.25 to 0.70 wt%, C
addition of 0.3 to 1.2 wt% and Zr0.0
5 to 0.4 wt%, Nb 0.05 to 0.4 wt%, Co 0.3
~ 0.8wt%, Fe0.3 ~ 0.7wt%, Si0.2 ~
Any one kind is added to Cu at a compounding ratio of 0.6 wt% and Sn 0.2 to 0.6 wt%.

Further preferably, Ni2.5-4.
8 wt%, Be 0.25 to 0.65 wt%, Cr 0.30
It is added to Cu in a compounding ratio of 1.0 wt%. In addition, Ni
2.5-4.8 wt%, Be 0.25-0.65 wt%, Cr
0.30 to 1.0 wt% is added and Zr0.0
5 ~ 0.3wt%, Nb0.05 ~ 0.3wt%, Co0.3
~ 0.7 wt%, Fe 0.3 ~ 0.65 wt%, Si 0.2 ~
Any one kind is added to Cu in the compounding ratio of 0.5 wt% and Sn0.2-0.5 wt%.

A method for producing a high-strength, high-conductivity copper alloy electrode material for resistance welding with the above composition is a solution treatment temperature of 900 ° C. to 990 for the composition of the above composition ratio.
Solution treatment is performed at ℃. If this temperature is lower than 900 ° C, the quenching effect as a copper alloy is not sufficient, and
If the temperature is higher than 0 ° C, the crystals are likely to coarsen due to overheating. Then, by performing an aging treatment at an aging treatment temperature of 420 to 550 ° C., a copper alloy for producing a high-strength, high-conductivity electrode material can be formed. Also regarding this aging treatment temperature, if it is lower than 420 ° C., sufficient precipitation cannot be performed and mechanical properties become low, and if it is higher than 550 ° C., overaging occurs.

By forming as described above, it is possible to obtain an electrode material which satisfies the initial target standard and is excellent in mechanical properties and conductivity. Moreover, since the content of expensive Be is small, a low-priced product can be obtained.

Further, the conventional BeCu25 alloy has too high mechanical properties and is difficult to mechanically process after aging treatment.
Work efficiency was poor. However, the electrode material of the present invention is
The mechanical properties are not too high as compared with the eCu25 alloy, it can be machined even after aging treatment, work efficiency is good, and it is economically excellent.

【Example】

The first to seventeenth embodiments of the present invention and the first to seventeenth embodiments
Table 1 below shows each material and blending ratio for the copper alloy of the tenth comparative example.

[0040]

[Table 1]

In the method for producing the copper alloy, first, the materials shown in Table 1 were prepared and filled in a graphite crucible for each of Examples and Comparative Examples. Then, the upper surface filled with the material was covered with charcoal, and the graphite crucible was set in a high-frequency electric furnace to carry out a melting treatment. Among the above materials, with respect to Be,
A Be-Cu master alloy containing 4 wt% of Be and a Cr-Cu master alloy containing 10 wt% of Cr were used as Z.
For r, a Zr-Cu master alloy containing 50 wt% of Zr, and for Nb, Nb-containing 12 wt% of Nb-
A Cu master alloy, a Co—Cu master alloy containing 10 wt% Co for Co, and a Si 10 wt% for Si
% Si-Cu master alloys were used. While using effective flux for each additive element, 1
The dissolution treatment was carried out at a temperature of 200 ° C. or higher.

Next, the molten material was poured into a metal mold having an inner diameter of 80 mm, and an ingot was manufactured while applying a pressure of 400 kg / cm ² . Then, after the outer periphery of the finished ingot was machined by chamfering, it was processed into a round bar shape by hot forging at a temperature of 850 ° C.

Then, the round bar was subjected to solution treatment at a temperature of 950.degree. Then, the round bar was inserted into an electric hot-air stove, and an aging treatment was performed at a temperature of 480 ° C.

A JIS No. 4 test piece was produced from the round bar-shaped copper alloy produced as described above, and its mechanical properties and electrical conductivity were measured. The test results are shown in Table 2 below. In Table 2, each example, comparative example and target standard are also described. As described above, the target standard is JIS Z 32.
34 Mechanical properties and JIS Z 323 according to Type 4
4 Numerical value in consideration of use as an electrode material having a third type conductivity.

[0045]

[Table 2]

From the copper alloys in Table 1 above, φ25 m
A high-temperature hardness test was carried out by collecting test rods of m and L20 mm and keeping them at respective predetermined temperatures. These tests are 1st, 2nd, 4th, 5th, 8th, 10th, 12th, 1st.
It carried out about the copper alloys of the 4th, 17th Example, and the 1st-3rd, 6th-10th comparative examples. The results of this high temperature hardness test are shown in Table 3 below. Furthermore, the samples subjected to the high temperature hardness test were returned to room temperature and then subjected to the hardness test. The results of the annealing hardness test are shown in Table 4 below. The measured values in Tables 3 and 4 are shown by Brinell hardness HB (10/500).

Furthermore, the first, second, fourth, fifth, eighth, tenth, twelfth, fourteenth, and first tests that have been subjected to the above-mentioned annealing hardness test.
Conductivity was measured for each of the seven examples and the first to third and sixth to tenth comparative examples, and the measurement results are shown in Table 5 below.

[0048]

[Table 3]

[0049]

[Table 4]

[0050]

[Table 5]

From the above test results, the effect of each embodiment of the present invention will be described. First, the composition examples of components in Table 1 are the numerical values of the results obtained by collecting analysis samples from the ingots prepared by mixing the respective materials and performing the analysis. Therefore, due to mixing of the flux during casting, generation of slag, etc., a slight error occurs from the target value of the mixing ratio.

Next, each test will be described in detail. First, in the test results of the mechanical properties and the conductivity shown in Table 2, the first and second comparative examples were tested by changing the addition amounts of Ni and Be. In this first comparative example, only the conductivity satisfies the target values, and the other mechanical properties do not satisfy the target values. Further, in the second comparative example, the hardness does not satisfy the target value, but the mechanical properties other than the hardness and the electrical conductivity satisfy the target values. In this way, Ni and Be are added to Cu,
A copper alloy containing no Cr cannot satisfy all the target values.

Further, in the third comparative example and the first to third examples,
This is an example of a test for promoting precipitation strengthening by adding Cr. As in the third comparative example, when the Ni content is low, C
Even if r is added, the target values of tensile strength and hardness are not satisfied. On the other hand, in the first, second and third embodiments, Ni is used.
The amount of Ni, Be and Cr added was changed to Ni2.3.
~ 5.3wt%, Be0.25 ~ 0.8wt%, Cr0.3 ~
Within the range of 1.5 wt%, the target values of mechanical properties and conductivity are sufficiently satisfied as in the first, second and third embodiments.

Further, the fourth comparative example and the fourth to sixth examples are examples in which the addition of Zr was tested to further promote the precipitation strengthening. As in the fourth comparative example, if the Zr addition amount is too small, the conductivity satisfies the target value,
The mechanical properties cannot meet the target value. On the other hand, Z
If the r addition amount is in the range of 0.05 to 0.5 wt%, the fourth
The target values of mechanical properties and conductivity can be satisfied as in the sixth embodiment.

The fifth comparative example and the seventh to ninth examples are
This is an example of a test for further promoting precipitation strengthening by adding Nb. When the amount of Nb added is too small as in the fifth comparative example, the electrical conductivity satisfies the target value, but the mechanical properties cannot satisfy the target value. On the other hand, if the amount of Nb added is in the range of 0.05 to 0.5 wt%, the target values of mechanical properties and conductivity can be satisfied as in the seventh to ninth examples.

The sixth comparative example, the tenth example, and the eleventh example are examples in which addition of Co was tested to further promote precipitation strengthening. As in the sixth comparative example, if the amount of Co added is too large, the mechanical properties satisfy the target value, but the electrical conductivity decreases, and the target value cannot be satisfied.
On the other hand, when the amount of Co added is in the range of 0.2 to 0.9 wt%, the target values of mechanical properties and conductivity can be satisfied as in the tenth and eleventh examples.

Further, the seventh comparative example, the twelfth and thirteenth examples are examples in which addition of Fe was tested to further promote precipitation strengthening. As in the seventh comparative example, if the added amount of Fe is too large, the mechanical properties are satisfied, but the electrical conductivity cannot satisfy the target value. On the other hand, if the amount of Fe added is in the range of 0.2 to 0.8 wt%, the twelfth and first
As in Example 3, the target values of mechanical properties and electrical conductivity can be satisfied.

The eighth comparative example, the fourteenth example, and the fifteenth example are examples in which Si is added to form a chrome silicide, and conductivity is not lowered, and improvement of mechanical properties is tested. However, as in the eighth comparative example, if the amount of Si added is too large, the mechanical properties satisfy the target values, but the electrical conductivity is significantly reduced. On the other hand, when the amount of Si added is 0.
Within the range of 2 to 0.7 wt%, the target values of mechanical properties and conductivity can be satisfied as in the 14th and 15th embodiments.

The ninth comparative example, the sixteenth example, and the seventeenth example are examples in which the addition of Sn was tested to promote solid solution strengthening. As in the ninth comparative example, if the Sn addition amount is too large, the mechanical properties satisfy the target values, but the electrical conductivity is significantly reduced. On the other hand, if the Sn addition amount is within the range of 0.2 to 0.7 wt%, the 16th and 17th
As in the examples, the target values of mechanical properties and conductivity can be satisfied.

The tenth comparative example shows the mechanical properties and electrical conductivity of the BeCu25 alloy. Naturally, JIS
Z 3234 Meets the fourth class mechanical properties and electrical conductivity. However, regarding the target standard, the electrical conductivity is lower than the target value although the mechanical properties are sufficiently satisfied.

As described above, according to the test results of the mechanical properties and the electrical conductivity shown in Table 2, the copper alloys of the first to seventeenth examples of the present invention show mechanical properties and conductivity in comparison with the first to tenth comparative examples. Both the electrical conductivity and the target standard were sufficiently satisfied.

Next, the high temperature hardness measurement test of Table 3 and Table 4
The calcination pure hardness measurement test is for examining heat resistance as an electrode material. Since Ni, Be and Cr almost fulfill their roles as additional elements that contribute to the room temperature hardness and the high temperature hardness, as shown in Table 3, there is almost no difference between the examples of the present invention. Also, the first to third,
In the sixth to ninth comparative examples, samples having different hardnesses at room temperature showed the same tendency as in the examples.

On the other hand, the BeCu25 alloy of the tenth comparative example is 282 at room temperature, which is 230HB of the copper alloy of each example.
It shows a higher value than before and after. However, at 350 ° C, 207
The hardness was remarkably lowered to HB, and at 450 ° C. or higher, the value was lower than that of the copper alloys of the respective examples. This difference in hardness decrease is due to the aging temperature. BeC of the 10th comparative example
The aging temperature of the u25 alloy is 320 ° C., and above that temperature, it is overaged and is significantly softened. On the other hand, since the aging temperature of the alloy of the present invention is 420 to 550 ° C, the temperature at which softening occurs is also high.

It can be said that normal electrode materials have a relationship between high temperature hardness and annealing hardness, and that a material having excellent high temperature hardness also has excellent pure hardness. And when comparing the room temperature hardness test result of Table 3 with the annealing hardness test result of Table 4,
Similar results have been obtained.

Further, the conductivity measurement test in Table 5 is to examine the energizing ability as an electrode material. The copper alloys of the first to third comparative examples did not satisfy the target value of hardness, but showed the conductivity of the target value or more. On the other hand, sixth to tenth
The sample of the comparative example was below the target value of conductivity. As compared with these comparative examples, the conductivity of the copper alloy of each example is 50 IACS, which is the conductivity before annealing even when the annealing temperature becomes high.
% Was maintained. Therefore, the copper alloy of the present invention has a target conductivity of 45IAC even when exposed to high temperatures.
It became clear that it did not fall below S% and was excellent in current carrying capacity.

Next, BeCu25 whose hardness affecting the machinability was adjusted to be equal to that of the copper alloy of the fourth embodiment of the present invention.
An alloy was produced as the eleventh comparative example. Table 6 below shows the results of measuring the mechanical properties and the electrical conductivity of the fourth example and the eleventh comparative example.

[0067]

[Table 6]

As shown in Table 6 above, when the hardness affecting the machinability is adjusted to HRC30, the copper alloy of the present invention and BeC are prepared.
The tensile strength and elongation of the u25 alloy showed almost the same values. However, the electrical conductivity of the copper alloy of the present invention was higher.

From the above measurement results, at least
Ni 2.3-4.8 wt%, Be 0.25-0.65 wt%,
Cr is added to Cu in a mixing ratio of 0.3 to 1.0 wt%, or Zr is 0.05 to 0.3 wt% and Nb is 0.05 to 0.3 w together with Ni, Be and Cr having the same mixing ratio as these.
t%, Co 0.3 to 0.7 wt%, Fe 0.3 to 0.65 wt
%, Si 0.2-0.5 wt%, Sn 0.2-0.5 wt% by adding one kind of additive element to Cu, not only mechanical properties, conductivity and heat resistance, It has been found that a copper alloy having excellent machinability and suitable for use as a high-strength, high-conductivity electrode material can be obtained.

The above-mentioned most preferable compounding ratio of each additive element is Ni 2.3 to 4.8 wt%, Be 0.25 to
0.7wt%, Cr 0.3-1.2wt% is added to Cu, or Zr0.05-0.4wt%, Nb0.05
~ 0.4wt%, Co0.3 ~ 0.8wt%, Fe0.3 ~
0.7 wt%, Si 0.2 to 0.6 wt%, Sn 0.2 to 0.
An excellent electrode material can be obtained by adding any one of 6 wt%. Further widening the range, Ni
2.3-5.3 wt%, Be 0.25-0.8 wt%, Cr
Add 0.2 to 1.5 wt% to Cu or add Zr to these
0.05-0.5 wt%, Nb 0.05-0.5 wt%, Co
0.2-0.9 wt%, Fe 0.2-0.8 wt%, Si0.
It is also possible to further add any one of 2 to 0.7 wt% and Sn 0.2 to 0.7 wt%.

[0071]

According to the present invention, as described above, N is added to Cu.
By adding i, Be and Cr, JIS Z 32
34 Mechanical properties according to the 4th type and JIS Z 32
34 It is possible to obtain a copper alloy that satisfies the third type conductivity and has excellent machinability and heat resistance, which is important as an electrode material. Further, a copper alloy having optimum conditions as an electrode material can be formed by reducing the amount of expensive Be added, and such an inexpensive electrode material can be obtained by an easy manufacturing method. it can. In addition, Cu, Ni, B
e, Cr are added, and Zr, Nb, Co,
By adding any one of Fe, Si, and Sn, it is possible to obtain stability of mechanical properties and to obtain an electrode material whose conductivity also satisfies the target value.

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Claims (14)

[Claims] 1. Ni 2.3 to 5.3 wt%, Be 0.25
~ 0.8 wt%, Cr 0.3 ~ 1.5 wt%, the balance is made of Cu excluding unavoidable impurities, the electrode material for resistance welding. 2. Ni 2.3 to 5.3 wt%, Be0.25
~ 0.8wt%, Cr 0.3 ~ 1.5wt%, Zr0.05 ~
C containing 0.5 wt% and the balance excluding inevitable impurities C
An electrode material for resistance welding, characterized by comprising u. 3. Ni 2.3 to 5.3 wt%, Be0.25
~ 0.8wt%, Cr 0.3 ~ 1.5wt%, Nb0.05 ~
C containing 0.5 wt% and the balance excluding inevitable impurities C
An electrode material for resistance welding, characterized by comprising u. 4. Ni2.3 to 5.3 wt%, Be0.25
~ 0.8wt%, Cr0.3 ~ 1.5wt%, Co0.2 ~
C containing 0.9 wt% and the balance excluding inevitable impurities C
An electrode material for resistance welding, characterized by comprising u. 5. Ni2.3 to 5.3 wt%, Be0.25
~ 0.8wt%, Cr0.3 ~ 1.5wt%, Fe0.2 ~
C containing 0.8 wt% and the balance excluding unavoidable impurities
An electrode material for resistance welding, characterized by comprising u. 6. Ni2.3 to 5.3 wt%, Be0.25
~ 0.8wt%, Cr0.3 ~ 1.5wt%, Si0.2 ~
C containing 0.7 wt% and the balance excluding unavoidable impurities
An electrode material for resistance welding, characterized by comprising u. 7. Ni2.3 to 5.3 wt%, Be0.25
~ 0.8 wt%, Cr 0.3-1.5 wt%, Sn 0.2 ~
C containing 0.7 wt% and the balance excluding unavoidable impurities
An electrode material for resistance welding, characterized by comprising u. 8. Ni2.3 to 5.3 wt%, Be0.25
.About.0.8 wt%, Cr 0.3 to 1.5 wt%, and the balance being a copper alloy made of Cu excluding inevitable impurities, subjected to solution treatment at a solution treatment temperature of 900.degree. A method for producing an electrode material for resistance welding, wherein the aging treatment is performed at a temperature of 420 to 550 ° C. 9. Ni2.3 to 5.3 wt%, Be0.25
~ 0.8wt%, Cr 0.3 ~ 1.5wt%, Zr0.05 ~
C containing 0.5 wt% and the balance excluding inevitable impurities C
A copper alloy made of u is treated at a solution treatment temperature of 900 ° C. to 990.
Solution treatment at ℃, then aging temperature 420 ~ 55
A method for producing an electrode material for resistance welding, which is characterized by being subjected to an aging treatment at 0 ° C. 10. Ni2.3 to 5.3 wt%, Be0.2
5 to 0.8 wt%, Cr 0.3 to 1.5 wt%, Nb0.05
˜0.5 wt% with the balance being Cu excluding unavoidable impurities, and a solution treatment temperature of 900 ° C. to 99 ° C.
Solution heat treated at 0 ° C, then aging temperature 420-5
A method for producing an electrode material for resistance welding, which is characterized by being subjected to an aging treatment at 50 ° C. 11. Ni2.3 to 5.3 wt%, Be0.2
5 to 0.8 wt%, Cr 0.3 to 1.5 wt%, Co 0.2 to
C containing 0.9 wt% and the balance excluding inevitable impurities C
A copper alloy made of u is treated at a solution treatment temperature of 900 ° C. to 990.
Solution treatment at ℃, then aging temperature 420 ~ 55
A method for producing an electrode material for resistance welding, which is characterized by being subjected to an aging treatment at 0 ° C. 12. Ni 2.3 to 5.3 wt%, Be0.2
5 to 0.8 wt%, Cr 0.3 to 1.5 wt%, Fe 0.2 to
C containing 0.8 wt% and the balance excluding unavoidable impurities
A copper alloy made of u is treated at a solution treatment temperature of 900 ° C to 990.
Solution treatment at ℃, then aging temperature 420 ~ 55
A method for producing an electrode material for resistance welding, which is characterized by being subjected to an aging treatment at 0 ° C. 13. Ni2.3 to 5.3 wt%, Be0.2
5 to 0.8 wt%, Cr 0.3 to 1.5 wt%, Si 0.2 to
C containing 0.7 wt% and the balance excluding unavoidable impurities
A copper alloy made of u is treated at a solution treatment temperature of 900 ° C. to 990.
Solution treatment at ℃, then aging temperature 420 ~ 55
A method for producing an electrode material for resistance welding, which is characterized by being subjected to an aging treatment at 0 ° C. 14. Ni2.3 to 5.3 wt%, Be0.2
5 to 0.8 wt%, Cr 0.3 to 1.5 wt%, Sn 0.2 to
C containing 0.7 wt% and the balance excluding unavoidable impurities
A copper alloy made of u is treated at a solution treatment temperature of 900 ° C. to 990.
Solution treatment at ℃, then aging temperature 420 ~ 55
A method for producing an electrode material for resistance welding, which is characterized by being subjected to an aging treatment at 0 ° C.