JP2008163439A - Copper alloy material and method for producing the same, and electrode member of welding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a copper alloy material having high strength and high conductivity. <P>SOLUTION: The copper alloy material is obtained through: a casting step where an ingot having a composition comprising, by mass, 1.5 to 3.0% Ni, 0.3 to 1.5% Si and 0.01 to 0.3% Zr, and the balance Cu with inevitable impurities, wherein the ratio of the Ni content to the Si content is 2 to 5; a hot working step where the ingot is subjected to hot extrusion or hot forging at a hot working temperature satisfying the hot working temperature(°C)≥870+the Ni content (mass%)×10 to thereby obtain a hot worked material; a rapid cooling step where the hot worked material is cooled to ≤300°C at a cooling rate of ≥100°C/s to thereby obtain a rapidly cooled material; and an aging step where the rapidly cooled material is heated at a temperature lower than the hot working temperature, and is subjected to aging to thereby obtain a copper alloy material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a copper alloy material having high strength and high conductivity. Hereinafter, a copper alloy material having high strength and high conductivity is also referred to as a copper alloy material having high strength and high conductivity.

  For example, copper alloy materials used for electrode members of welding equipment are required to have high strength and high conductivity.

  An example of a copper alloy material that satisfies this requirement is a copper alloy material defined in JIS Z 3234. Among these, in particular, a copper alloy material conforming to JIS Z 3234 class 3 (hereinafter also simply referred to as class 3), that is, a copper alloy having a tensile strength of 690 MPa or more and a conductivity of 45% IACS or more. Examples of the material include a Cu—Be based copper alloy material to which Be is added as a precipitation hardening element, but there is no influential material suitable for class 3 other than this Cu—Be based copper alloy material.

  However, the additive element Be is an element harmful to the environment. And with the recent increase in environmental protection, there is a movement to regulate the use of harmful substances, and Be may be subject to regulation. Therefore, development of a high-strength and high-conductivity copper alloy material that does not contain Be is desired.

  Cu-Ni-Si-based copper alloy materials are known as high-strength and high-conductivity copper alloy materials other than Cu-Be-based copper alloy materials. However, by adjusting only Ni and Si components, Cu-Be It was difficult to obtain the same strength and conductivity as the copper alloy material.

  Therefore, as an improvement of the Cu—Ni—Si based copper alloy material, it is conceivable to add other elements in addition to Ni and Si. For example, JP-A-2-166249 of Patent Document 1 discloses a Cu—Ni—Si based copper alloy in which Cr, Mg, Zr and Co are added to a Cu—Ni—Si based copper alloy.

  Further, as an improvement of other Cu—Ni—Si based copper alloy materials, it is conceivable to refine the recrystallized grains (static recrystallized grains) generated by annealing after cold working.

  Further, as an improvement of other Cu—Ni—Si based copper alloy materials, it is conceivable to refine the recrystallized grains (dynamic recrystallized grains) generated during hot working or cold working. For example, Japanese Patent Application Laid-Open No. 2002-356728 of Patent Document 2 discloses a method for producing copper and a copper alloy that causes dynamic continuous recrystallization by final cold rolling, and the degree of processing in the final cold rolling: processing Disclosed is a method for producing copper and copper alloys, characterized in that a rolling process is performed with a degree = ln (T0 / T1; T0 is a plate thickness before rolling, and T1 is a plate thickness after rolling) with a working degree ≧ 3. ing.

JP-A-2-166249 (Claims) JP 2002-356728 A (Claims 1 and 2)

However, in Patent Document 1, the strength increase contribution due to the additive element is small compared to the contribution due to precipitation of Ni ₂ Si. Therefore, the adjustment of the additive element cannot satisfy both requirements of high strength and high conductivity.

Further, in a precipitation hardening type alloy such as a Cu—Ni—Si based copper alloy material, a solution treatment for obtaining a supersaturated solid solution is performed by forcibly cooling after maintaining a temperature at which the precipitation hardening element is completely dissolved. it is necessary, in the Cu-Ni-Si-based copper alloy material, the recrystallization temperature of the base material, the precipitation temperature of the Ni 2 _Si is substantially coincident, the heating temperature in the solution treatment, the recrystallization temperature or higher In other words, coarsening of the refined crystal grains is inevitable. Therefore, the improvement of the Cu—Ni—Si based copper alloy material by refining the static recrystallized grains is not an effective method.

  In Patent Document 2, dynamic recrystallization is caused by increasing the degree of processing during cold working to make crystal grains fine. However, such a method can be used. The plate material can be cold-rolled, that is, the plate material that can be made uniform with high workability.

  However, a shape formed by hot extruding a copper ingot into a specific shape is subjected to cold working with a high degree of work as in Patent Document 2 in the manufacturing process after hot extrusion. Therefore, it is difficult to refine crystal grains by cold working in manufacturing the shape. In addition, since the shape material is manufactured by hot extruding a copper ingot into a complicated shape with a non-constant thickness, the particle size distribution of crystal grains tends to be non-uniform throughout the material. For these reasons, it has been difficult to obtain a shape made of a high-strength and high-conductivity copper alloy material by a technique of refining crystal grains by cold working with a high workability.

  In addition, in the manufacture of pipes or rods, cold working such as drawing can be performed after hot working, but the degree of work is high because cold working with a higher working degree cannot be performed as a plate material. It has been difficult to obtain a pipe or bar made of a high-strength and high-conductivity copper alloy material by a technique of refining crystal grains by cold working.

  In the production of forged materials, cold forging with a high workability can be performed after hot working. However, since the thickness of the plate material is uniform, the degree of processing of the entire material can be made uniform by cold rolling, so that the grain size distribution of the crystal grains is uniform throughout the material. However, since the thickness of the forged material is not uniform, it is difficult to make the workability of the entire material uniform, so that the crystal grain size distribution is uniform throughout the material. I can't. Therefore, it has been difficult to obtain a forging material made of a copper alloy material having high strength and high conductivity by means of cold forging the forging material.

  Accordingly, an object of the present invention is to provide a copper alloy material having high strength and high conductivity. In particular, it is to provide a material other than a plate material made of a high-strength and high-conductivity copper alloy material, for example, a shape member, a pipe material, a bar material, and a forging material made of a high-strength and high-conductivity copper alloy material.

  As a result of intensive studies to solve the above-described problems in the prior art, the present inventors have adjusted the additive elements of the copper alloy material and the amount of the additive, and the conditions of the hot working process and the subsequent quenching process. By selecting the above, it is possible to obtain a copper alloy material having uniform and fine crystal grains without performing cold working with a high degree of processing. The copper alloy material thus obtained has high strength and high conductivity. As a result, the present invention has been completed.

That is, the present invention (1) contains 1.5 to 3.0% by mass of Ni, 0.3 to 1.5% by mass of Si, 0.01 to 0.3% by mass of Zr, and the balance Cu and A casting process comprising inevitable impurities and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
An aging treatment step of obtaining a copper alloy material by heating the quenching treatment material at a temperature lower than the hot working temperature and aging treatment;
The present invention provides a copper alloy material characterized in that

Moreover, this invention (2) contains 1.5-3.0 mass% of Ni, 0.3-1.5 mass% of Si, 0.01-0.3 mass% of Zr, and balance Cu and A casting process comprising inevitable impurities and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
Cold working the cold treated material at least once to obtain a cold worked material; and
An aging treatment step of obtaining a copper alloy material by heating the cold-worked material at a temperature lower than the hot working temperature and aging treatment;
The present invention provides a copper alloy material characterized in that

Moreover, this invention (3) contains 1.5-3.0 mass% of Ni, 0.3-1.5 mass% of Si, 0.01-0.3 mass% of Zr, and the balance Cu and A casting process comprising inevitable impurities and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
An aging treatment step of obtaining a copper alloy material by heating the quenching treatment material at a temperature lower than the hot working temperature and performing an aging treatment;
A method for producing a copper alloy material is provided.

Moreover, this invention (4) contains 1.5-3.0 mass% of Ni, 0.3-1.5 mass% of Si, 0.01-0.3 mass% of Zr, and the balance Cu and A casting process comprising inevitable impurities and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
Cold working the cold treated material at least once to obtain a cold worked material; and
An aging treatment step of obtaining a copper alloy material by heating the cold-worked material at a temperature lower than the hot working temperature and aging treatment;
A method for producing a copper alloy material is provided.

  Moreover, this invention (5) provides the electrode member of the welding equipment characterized by consisting of the copper alloy material as described in either said invention (1) or (2).

  According to the present invention, a copper alloy material having high strength and high conductivity can be provided. In particular, it is possible to provide materials other than a plate material made of a high-strength and high-conductivity copper alloy material, for example, shapes, pipes, rods and forgings made of a high-strength and high-conductivity copper alloy material.

The copper alloy material of the first embodiment of the present invention contains 1.5 to 3.0 mass% of Ni, 0.3 to 1.5 mass% of Si, and 0.01 to 0.3 mass% of Zr. A casting process comprising a balance Cu and unavoidable impurities, and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
An aging treatment step of obtaining a copper alloy material by heating the quenching treatment material at a temperature lower than the hot working temperature and aging treatment;
It is a copper alloy material obtained by performing the above.

  The casting step according to the copper alloy material of the first aspect of the present invention is a step of obtaining an ingot containing Ni, Si and Zr, with the balance being Cu and inevitable impurities.

  The ingot contains Ni, Si, and Zr, and the content of Ni in the ingot is 1.5 to 3.0% by mass, preferably 1.7 to 2.8% by mass. The Si content is 0.3 to 1.5 mass%, preferably 0.4 to 1.2 mass%, and the Zr content is 0.01 to 0.3 mass%, preferably 0. 0.05 to 0.25% by mass. When the contents of Ni, Si, and Zr in the ingot are all within the above range, the strength of the copper alloy material is increased. In particular, by setting the contents of Ni, Si, and Zr in the ingot to be in the above ranges, a copper alloy material that meets Class 3 standards can be provided. On the other hand, if any of the contents of Ni, Si and Zr in the ingot is less than the above range, the strength of the copper alloy material is lowered, and the strength satisfying the class 3 standard cannot be obtained. In particular, when the Zr content in the ingot is less than the above range, the strength of the copper alloy material is lowered, and the softening characteristic temperature is lowered. For example, the standard of class 3 is that when a copper alloy material is heated, the ratio of the hardness after heating to the hardness before heating (hardness after heating / hardness after heating) is 0.85 ( Class 3 softening characteristic temperature) is 465 ° C. or higher, and if the Zr content in the ingot is less than the above range, the characteristics required for class 3 standards cannot be satisfied. . Further, if any of the contents of Ni, Si and Zr in the ingot exceeds the above range, the conductivity is insufficient and the conductivity satisfying the class 3 standard cannot be obtained. In particular, when the Zr content in the ingot exceeds the above range, the ductility of the copper alloy material becomes low in addition to the lack of conductivity of the copper alloy material.

  The ratio of the Ni content to the Si content in the ingot (Ni content / Si content) is 2 to 5, preferably 2.5 to 4.5. When the ratio of the Ni content to the Si content in the ingot is in the above range, the conductivity of the copper alloy material is increased. On the other hand, if the ratio of the Ni content to the Si content in the ingot is outside the above range, the conductivity of the copper alloy material becomes low due to the influence of excess Ni or Si.

  The ingot can contain Bi in addition to Ni, Si and Zr. The copper alloy material of the first aspect of the present invention may be subjected to cutting or drilling as a secondary process after being processed into a shape, tube, bar or forged material. In this case, the ingot is preferable in that it contains Bi so that the machinability of the copper alloy material is improved. If the Bi content in the ingot exceeds 1.0% by mass, cracking is likely to occur during hot working or cold working, so the Bi content in the ingot. Is particularly preferably 0.1 to 1.0% by mass.

  And this ingot consists of Ni, Si, and Zr, Bi contained as needed, remainder Cu and inevitable impurities.

  The method for obtaining the ingot by the casting process is not particularly limited, and for example, a copper ingot and an element ingot of the element contained in the copper alloy material of the first aspect of the present invention or an alloy of the element and copper are included. Are mixed so that the content in the copper alloy material becomes a predetermined content, the components are adjusted, and then the ingot is cast using a high-frequency melting furnace or the like.

  In the casting process, since Zr is an active metal, an oxidation loss at the time of dissolution increases, and therefore, in the component adjustment, a blending that takes into consideration the oxidation loss at the time of dissolution of Zr is necessary.

  In the hot working step according to the copper alloy material of the first aspect of the present invention, the ingot obtained by performing the casting step is hot extruded or hot forged, and has the same shape as the final product or the final product. It is the process of processing to the shape close | similar to and obtaining a hot work material.

In the hot working step, the ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
Hot extrusion or hot forging at a hot working temperature satisfying Further, the hot working temperature in the hot working step may be a temperature that is not less than “870 + Ni content (mass%) × 10” (° C.) and does not melt the material, It is preferably “870 + Ni content (mass%) × 10” (° C.) or more and 970 ° C. or less, particularly preferably “890 + Ni content (mass%) × 10” (° C.) or more and 960 ° C. or less. . In the above formula (1), the Ni content refers to the Ni content in the ingot.

  In the hot working step, the method of hot extruding or hot forging the ingot is not particularly limited, and hot extrusion or hot forging that is usually used can be employed in the processing of the copper alloy material. .

  In the rapid cooling treatment step according to the copper alloy material of the first aspect of the present invention, the hot work material obtained by performing the hot work step is cooled to 300 ° C. or less at a cooling rate of 100 ° C./second or more. And a step of obtaining a rapid cooling material. In order to achieve the above cooling rate, in the rapid cooling treatment step, the hot work material is preferably water-cooled by, for example, putting the hot work material into a water tank. At that time, in consideration of the heat capacity, the cooling rate can be controlled by using a water tank having an appropriate volume or by appropriately supplying cooling water. When the hot-worked material is put into a water tank and rapidly cooled, the cooling rate decreases as the temperature of the hot-worked material decreases from the hot-working temperature. In this case, cooling at 300 ° C. It is necessary to control the speed to 100 ° C./second or more. In addition, since the influence of a cooling rate will become very slight when the temperature of this rapid cooling processing material will be less than 300 degreeC, it is not necessary to control a cooling rate.

  In the rapid cooling treatment step, it is preferable to rapidly cool the obtained hot worked material immediately after the hot working step, that is, the hot worked material immediately after the hot working step. It is preferable to perform the rapid cooling of the hot-worked material from the temperature of the temperature of the present invention while the hot-worked material moves from the hot working step to the rapid cooling treatment step due to the convenience of the production line. The temperature of the hot-worked material may be lowered as long as the effect is not impaired.

  The quenching treatment material is obtained by performing the quenching treatment step. The quenching treatment material is a supersaturated solid solution in which crystal grains are fine and uniform, and in addition, a precipitation hardening element is supersaturated. is there.

  In the copper alloy material of the first aspect of the present invention, the hot working step is performed at a hot working temperature of “870 + Ni content (mass%) × 10” (° C.) or higher, and 100 ° C./second or higher. By carrying out the quenching treatment step of cooling to 300 ° C. or less at a cooling rate of the following, the crystal grains in the quenching treatment material can be made fine and uniform, and as a result, the crystal grains in the copper alloy material Can be made fine and uniform.

  The hot working step also serves as a treatment for completely dissolving the precipitation hardening elements, that is, Ni, Si and Zr, generally called a solution treatment. Therefore, when the hot working temperature in the hot working step is less than “870 + Ni content (mass%) × 10” (° C.), Ni or Si did not sufficiently dissolve and did not dissolve. Since Ni or Si is present in the copper alloy material as coarse crystals, the contribution of the strength increase of the copper alloy material due to Ni and Si is reduced, and the strength of the copper alloy material is reduced.

  Further, when the cooling rate in the rapid cooling treatment step is less than 100 ° C./second, Ni, Si or Zr does not dissolve, but precipitates as a coarse precipitate, and precipitation hardening in the later aging treatment step Due to the lack of fine precipitates that contribute to the above, a sufficient strength increasing effect cannot be obtained.

  Further, in the quenching process, when the lower limit of the temperature of the quenching material for controlling the cooling rate is higher than 300 ° C., Ni, Si or Zr does not dissolve, and precipitates as coarse precipitates. If the fine precipitates that contribute to precipitation hardening in the subsequent aging treatment step are insufficient, a sufficient strength increasing effect cannot be obtained.

  In the aging treatment step according to the copper alloy material of the first aspect of the present invention, the quenching treatment material obtained by performing the quenching treatment step is heated at a temperature lower than the hot working temperature to perform an aging treatment. This is a step of obtaining a copper alloy material.

  In the aging treatment step, the quenching material is heated, and the heating temperature when heating the quenching material is lower than the hot working temperature, and is generally 300 to 700 ° C. If the heating temperature at the time of heating the quenching material exceeds the hot working temperature, the effect of performing the quenching process is offset, and the effect of increasing the strength by the precipitation hardening element cannot be obtained sufficiently. The heating time for heating the quenching material is appropriately selected, but is preferably 10 minutes or more, particularly preferably 30 minutes to 10 hours.

  In the aging treatment step, the quenching material is subjected to an aging treatment to precipitate precipitation hardening elements Ni, Si, and Zr.

The copper alloy material of the second embodiment of the present invention contains 1.5 to 3.0 mass% of Ni, 0.3 to 1.5 mass% of Si, and 0.01 to 0.3 mass% of Zr. A casting process comprising a balance Cu and unavoidable impurities, and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
Cold working the cold treated material at least once to obtain a cold worked material; and
An aging treatment step of obtaining a copper alloy material by heating the cold-worked material at a temperature lower than the hot working temperature and aging treatment;
It is a copper alloy material obtained by performing the above.

  In other words, the copper alloy material according to the second aspect of the present invention further includes a cold working step between the rapid cooling treatment step and the aging treatment step according to the copper alloy material according to the first aspect of the present invention. .

  Therefore, the casting process and the rapid cooling process according to the copper alloy material of the second aspect of the present invention are the same as the casting process and the rapid cooling process according to the copper alloy material of the first aspect of the present invention.

  Moreover, the aging treatment process according to the copper alloy material of the second aspect of the present invention is replaced with the quenching treatment material obtained by performing the quenching treatment process according to the copper alloy material of the first aspect of the present invention. It is the same as the aging treatment process according to the copper alloy material of the first embodiment of the present invention, except that the cold work material obtained by performing the cold working process according to the copper alloy material of the second embodiment.

  Therefore, hereinafter, differences between the copper alloy material of the second embodiment of the present invention and the copper alloy material of the first embodiment of the present invention will be described.

  The cold working process is a process of cold working the quenching material obtained by performing the quenching process to obtain the cold working material. Examples of the cold working include cold drawing, cold bending, and cold forging.

  In the cold working step, the method of cold working the rapid-quenched material is not particularly limited, and cold working that is normally used in the machining of a copper alloy material can be employed.

  In the cold working step, the number of times that the rapid cooling material is cold worked may be one time or a plurality of times. In the cold working step, when a plurality of cold workings are performed, it is usual to perform an annealing process between the cold workings.

  In the cold working step, if the amount of the precipitation hardening element in the quenched material is too large, the workability in the cold working step is remarkably lowered, and the cold working cannot be performed. In the copper alloy material according to the second aspect of the present invention, when the cooling rate in the rapid cooling treatment process is slower than 100 ° C./second, the amount of precipitation hardening elements precipitated in the rapid cooling material increases. Therefore, the workability in the cold working process is remarkably lowered.

  And in the copper alloy material of the 2nd form of this invention, following this cold work process, this aging treatment process is performed using this cold work material obtained by performing this cold work process.

  In addition, in the copper alloy material according to the first aspect of the present invention and the copper alloy material according to the second aspect of the present invention, after the aging treatment step, secondary processing such as bending is performed as necessary. be able to.

  The copper alloy material obtained by performing the aging treatment step according to the copper alloy material of the first aspect of the present invention and the copper alloy material of the second aspect of the present invention contains Ni, Si and Zr, Ni The content of Si is 1.5 to 3.0% by mass, preferably 1.7 to 2.8% by mass, and the Si content is 0.3 to 1.5% by mass, preferably 0.4. The content of Zr is 0.01 to 0.3% by mass, preferably 0.05 to 0.25% by mass. The average grain size of the crystal grains in the copper alloy material obtained by performing the aging treatment step according to the copper alloy material of the first aspect of the present invention and the copper alloy material of the second aspect of the present invention is 5 μm or less. It is.

  Thus, the copper alloy material according to the first aspect of the present invention and the copper alloy material according to the second aspect of the present invention, the copper alloy material obtained by performing the aging treatment step, that is, the first aspect of the present invention. The crystal grains in the copper alloy material and the copper alloy material of the second aspect of the present invention have a fine and uniform grain size of 5 μm or less. Therefore, the copper alloy material of the first aspect of the present invention and the copper alloy material of the second aspect of the present invention have high strength and high electrical conductivity.

  The copper alloy material of the first form of the present invention and the copper alloy material of the second form of the present invention are shaped into a specific shape by hot extrusion of the ingot, a tube, a bar, Used for forging. That is, the copper alloy material according to the first aspect of the present invention and the copper alloy material according to the second aspect of the present invention are copper alloy materials for shapes, pipes, rods, or forgings.

The manufacturing method of the copper alloy material of the first aspect of the present invention is as follows: Ni is 1.5 to 3.0% by mass, Si is 0.3 to 1.5% by mass, and Zr is 0.01 to 0.3% by mass. A casting step of obtaining an ingot comprising the remaining Cu and the inevitable impurities, the ratio of the Ni content to the Si content being 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
An aging treatment step of obtaining a copper alloy material by heating the quenching treatment material at a temperature lower than the hot working temperature and aging treatment;
It is a manufacturing method of the copper alloy material which has this.

Moreover, the manufacturing method of the copper alloy material of the 2nd form of this invention is 1.5-3.0 mass% of Ni, 0.3-1.5 mass% of Si, and 0.01-0. A casting step containing 3% by mass, consisting of the balance Cu and inevitable impurities, and obtaining an ingot having a ratio of Ni content to Si content of 2 to 5,
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
Cold working the cold treated material at least once to obtain a cold worked material; and
An aging treatment step of obtaining a copper alloy material by heating the cold-worked material at a temperature lower than the hot working temperature and aging treatment;
It is a manufacturing method of the copper alloy material which has this.

  The casting process, the hot working process, the rapid cooling process and the aging process according to the method for producing the copper alloy material of the first aspect of the present invention are the casting process, the heat according to the copper alloy material of the first aspect of the present invention. This is the same as the inter-working process, the rapid cooling process, and the aging treatment process, and the same is that after the aging treatment process, secondary processing such as bending can be performed as necessary. Further, the casting process, hot working process, quenching process, cold working process and aging treatment process according to the method for producing the copper alloy material of the second aspect of the present invention are the copper alloy of the second aspect of the present invention. It is the same as the casting process, hot working process, rapid cooling process, cold working process, and aging treatment process related to the material. After the aging treatment process, secondary processing such as bending is performed as necessary. The same is true for the point that

  Since the copper alloy material according to the first aspect of the present invention and the copper alloy material according to the second aspect of the present invention have strength and conductivity conforming to the class 3 standard of JIS Z 3234, Cu-Be It can be used as a copper alloy material that replaces the copper alloy material.

  For example, the copper alloy material according to the first aspect of the present invention and the copper alloy material according to the second aspect of the present invention are copper instead of Cu-Be based copper alloy materials conventionally used as electrode members for welding equipment. It is preferably used as an alloy material.

  That is, the electrode member of the welding equipment of the present invention is made of the copper alloy material of the first aspect of the present invention or the copper alloy material of the second aspect of the present invention.

  EXAMPLES Next, although an Example is given and this invention is demonstrated more concretely, this is only an illustration and does not restrict | limit this invention.

(Examples 1-5, Comparative Examples 1-8)
Using ingots of Cu, Ni, Si, Zr and Bi, blended with the components shown in Table 1, and after producing a φ100 mm ingot using a high frequency melting furnace, stripping to φ90 mm, Table 1 (Examples) 1-5) or hot extrusion at the hot working temperatures shown in Table 3 (Comparative Examples 1-8) to obtain a hot-worked material A of φ20 mm rod. A water tank for cooling is prepared on the outlet side of the extruder for hot extrusion, and immediately after the hot extrusion, the hot processed material A is guided to the water tank and rapidly cooled to obtain the quenched material B. It was. Table 1 (Examples 1 to 5) or Table 3 (Comparative Examples 1 to 8) show the cooling rate at 300 ° C. during the rapid cooling. The cooling rate was measured by embedding a thermocouple in a dummy of the same size heated to the same temperature.
Next, the quenched material B was cold-drawn to obtain a cold-worked material C. The obtained cold-worked material C was subjected to a bending test (Evaluation 1). The results are shown in Table 2 (Examples 1 to 5) or Table 4 (Comparative Examples 1 to 8).
Next, the cold-worked material C after the bending test was heated at 500 ° C. for 2 hours to perform an aging treatment, and a copper alloy material D was obtained. The obtained copper alloy material D was subjected to a tensile test, hardness measurement (evaluation 2), softening characteristic temperature measurement (evaluation 3), and conductivity measurement (evaluation 4). The results are shown in Table 2 (Examples 1 to 5) or Table 4 (Comparative Examples 1 to 8). Further, the average grain size of the crystal grains of the copper alloy material D was measured. The results are shown in Table 2 (Examples 1 to 5) or Table 4 (Comparative Examples 1 to 8).

(Evaluation test method)
(1) Bending test (Evaluation 1)
The cold-worked material C was bent 90 degrees in the cold, and the surface state of the bent portion was observed. The case where cracks and wrinkles did not occur on the surface after bending was indicated as “◯”, and the case where cracks or wrinkles occurred was indicated as “x”.
(2) Tensile test, hardness measurement and ductility test (Evaluation 2)
A tensile test of the copper alloy material D was performed according to JIS Z 2241. Moreover, the Vickers hardness measurement of this copper alloy material D was performed based on JISZ2244.
The standard value of class 3 is “tensile strength: 690 MPa or more, elongation: 9% or more, Vickers hardness: 200 or more”. What did not exist was set as "x".
(3) Measurement of softening characteristic temperature (Evaluation 3)
The copper alloy material D was placed in a salt bath furnace at 475 ° C., and the Vickers hardness was measured before and after the addition. The ratio of the Vickers hardness of the copper alloy material D after charging to the Vickers hardness of the copper alloy material D before charging into the salt bath furnace (hardness after charging / hardness before charging) is 0.85. The above were marked with “◯” and those less than 0.85 were marked with “x”.
(4) Conductivity measurement (Evaluation 4)
The conductivity was measured with a sigma tester on the cross section.
Since the standard value of class 3 is “conductivity: 45% IACS or more”, the standard value satisfying the class 3 is “◯”, and the standard value is not “x”.
(5) Measurement of average grain size of crystal grains in copper alloy material The average grain size of crystal grains in the copper alloy material D was measured by a cutting method based on JIS H 0501.
The case where the average particle size was 5 μm or less was “◯”, and the case where the average particle size was more than 5 μm was “x”.

In Comparative Example 1, since the Si content was small, sufficient strength was not obtained, and since the Ni / Si ratio was high, the conductivity was lowered due to excessive Ni, and the characteristic evaluation required for class 3 2 and 4 were rejected.
In Comparative Example 2, since the Ni content was large, the electrical conductivity was low, and the characteristic evaluation 4 required for Class 3 was not acceptable.
In Comparative Example 3, since the cooling rate in the rapid cooling after hot extrusion was slow, the crystal grains were coarsened and coarse Ni ₂ Si was precipitated, and as a result, the strength was low. Therefore, it failed in the characteristic evaluation 1 and the characteristic evaluation 2 requested | required by the class 3.
In Comparative Example 4, since the Ni / Si ratio was low, the conductivity was lowered due to excessive Si, and the characteristic evaluation 4 required for class 3 was not satisfied.
In Comparative Example 5, since the Zr content was small, the softening characteristic temperature was low, the strength was low, and the characteristic evaluations 2 and 3 required for class 3 were not acceptable.
In Comparative Example 6, since the hot extrusion temperature was low, the precipitation hardening element was not sufficiently dissolved, and thus the strength was low. Therefore, it failed the characteristic evaluations 1 and 2 required in class 3.
In Comparative Example 7, since the Zr content was large, coarse precipitates were generated, and as a result, ductility was lowered. Therefore, it failed the characteristic evaluation 2 required in class 3.
In Comparative Example 8, since the Ni content was small, the strength was low, and the characteristic evaluation 2 required for class 3 was not acceptable.

  According to the present invention, a high-strength and high-conductivity copper alloy material can be provided without including Be harmful to the environment.

Claims (5)

Contains 1.5 to 3.0% by mass of Ni, 0.3 to 1.5% by mass of Si, 0.01 to 0.3% by mass of Zr, consists of the remainder Cu and inevitable impurities, and contains Si. A casting step of obtaining an ingot having a Ni content ratio of 2 to 5;
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
An aging treatment step of obtaining a copper alloy material by heating the quenching treatment material at a temperature lower than the hot working temperature and aging treatment;
A copper alloy material obtained by performing Contains 1.5 to 3.0% by mass of Ni, 0.3 to 1.5% by mass of Si, 0.01 to 0.3% by mass of Zr, consists of the remainder Cu and inevitable impurities, and contains Si. A casting step of obtaining an ingot having a Ni content ratio of 2 to 5;
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
Cold working the cold treated material at least once to obtain a cold worked material; and
An aging treatment step of obtaining a copper alloy material by heating the cold-worked material at a temperature lower than the hot working temperature and aging treatment;
A copper alloy material obtained by performing Contains 1.5 to 3.0% by mass of Ni, 0.3 to 1.5% by mass of Si, 0.01 to 0.3% by mass of Zr, consists of the remainder Cu and inevitable impurities, and contains Si. A casting step of obtaining an ingot having a Ni content ratio of 2 to 5;
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
An aging treatment step of obtaining a copper alloy material by heating the quenching treatment material at a temperature lower than the hot working temperature and aging treatment;
The manufacturing method of the copper alloy material characterized by having. Contains 1.5 to 3.0% by mass of Ni, 0.3 to 1.5% by mass of Si, 0.01 to 0.3% by mass of Zr, consists of the remainder Cu and inevitable impurities, and contains Si. A casting step of obtaining an ingot having a Ni content ratio of 2 to 5;
The ingot is expressed by the following formula (1):
Hot working temperature (° C.) ≧ 870 + Ni content (mass%) × 10 (1)
A hot working step for obtaining a hot work material by hot extruding or hot forging at a hot working temperature satisfying
A rapid cooling treatment step of cooling the hot-worked material at a cooling rate of 100 ° C./second or more to 300 ° C. or less to obtain a rapidly treated material;
Cold working the cold treated material at least once to obtain a cold worked material; and
An aging treatment step of obtaining a copper alloy material by heating the cold-worked material at a temperature lower than the hot working temperature and aging treatment;
The manufacturing method of the copper alloy material characterized by having.   An electrode member for welding equipment, comprising the copper alloy material according to claim 1.