JP2003301250A - Age-hardened welded pipe and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an age-hardened, welded tube which shows a high weld strength, is easily embossed and has an increased strength, and its manufacturing process. <P>SOLUTION: The process comprises a solution treatment step wherein a bar T made of an age-hardenable copper alloy is heated and subjected to solution treatment to achieve a uniform distribution of solute atoms, an embossing step wherein embossing is performed on at least one surface of the solution- treated bar T1, a tube-forming step wherein the embossed bar T1 is formed into a tube by passing it through multiple forming rolls, a welding step wherein both ends of the tubular bar are heated and butt welded, and an age-hardening step wherein the welded tube obtained through the welding step is heated to precipitate the solute atoms into a base material to harden the welded tube. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an age-hardened welded pipe using an age-hardenable copper alloy and a method for producing the same.

[0002]

2. Description of the Related Art In general, a heat exchanger for an air conditioner or a refrigerator uses a large number of copper pipes as a refrigerant flow path. Heat is exchanged between them, and cooling and heating are performed.

In order to improve the efficiency of heat transfer between the refrigerant inside the copper tube and the copper tube, an uneven structure such as a spiral groove is also formed on the inner surface of the copper tube by embossing. By forming such a concavo-convex structure, the refrigerant flowing along the inner surface of the copper tube is agitated, the occurrence of a boundary layer along the inner surface of the copper tube is suppressed, and the heat transfer efficiency between the refrigerant and the copper tube is reduced. Because it can be raised. When the inner surface of the copper pipe is embossed, a so-called ERW pipe method is used in which the surface of the strip material is first embossed and then the strip material is formed into a tubular shape and welded. .

[0004]

By the way, the use of this type of copper pipe is expanding further, and the diameter of the pipe is made thinner, the wall thickness of the pipe is made thinner than before, and the pipe is curved. A heat exchange device that is molded and used in a self-supporting state is also being developed.
In such a case, in order to prevent the deformation of the pipe, it is preferable to use a copper alloy having a higher strength than high-purity copper as the material of the pipe, but simply using a high-strength copper alloy causes unevenness in welding. There was a problem that the strength of the welded part was unevenly reduced due to the occurrence. Further, when embossing the inner surface of the pipe, using a high-strength copper alloy causes severe wear of the embossing device, shortens the life of the device, and creates an uneven structure with a necessary and sufficient depth. There was a problem that it could not be formed.

The present invention has been made in view of the above circumstances, and has a high strength pipe, a stable weld strength, and an age-hardened welded pipe that enables easy embossing when embossing is performed. It is an object to provide a manufacturing method thereof.

[0006]

In order to solve the above-mentioned problems, a method for producing an age-hardened welded pipe according to the present invention is a solution for uniformly distributing solute atoms by heating a strip made of an age-hardenable copper alloy. Solution treatment step for performing the chemical treatment,
A tube forming step of forming the solution-treated strip into a tubular shape through a plurality of forming rolls, a welding step of heating both end edges of the tubular strip and then butt-welding the same, and the welding step And an age hardening treatment step of heating the obtained welded tube to precipitate the solute atoms in the base material and hardening the welded tube.

This method may further include an embossing step of performing embossing on at least one surface of the solution-treated strip.

The age hardening copper alloy contains 50 wt% of copper.
%, Be, Mg, Ca, Ti, Zr, Hf,
V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co,
Rh, Ir, Ni, Pd, Pt, Ag, Au, Zn, C
d, B, Al, Ga, In, Tl, C, Si, Ge, S
n, Pb, P, As, Sb, Bi, O, S, Se, T
It may contain 0.01 to 49 wt% of one or more elements selected from e and rare earth elements.

Further, the age hardening welded pipe according to the present invention is
An age hardening welded pipe obtained by the above manufacturing method,
The shape is arbitrary, but may be U-shaped or spiral. In the case of such a shape, it is preferable that after obtaining a welded pipe, the welded pipe is bent and shaped into a predetermined shape, and then the welded pipe having the shape is heated to perform an age hardening treatment.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a heat treatment and slitting apparatus used when carrying out an embodiment of a method for manufacturing an age hardening welded pipe according to the present invention. Reference numeral 1 in the figure denotes an uncoiler, which continuously feeds a wide strip T having a constant thickness from the coil at a constant speed. The strip T fed from the uncoiler 1 passes through the heating furnace 4, is heated by the heating mechanism 6 provided in the heating furnace 4, and is rapidly cooled after being discharged from the heating furnace 4.

A quenching mechanism for quenching the strip T may be provided in the subsequent stage of the heating furnace 4. However, if the strip T is thin, it can be sufficiently cooled by radiating heat in the air. As a quenching mechanism, an inert gas or liquid is used for the strip T.
It is easy to carry out such a method as to bring the strip material into contact with the strip material or a method of bringing a metal roll into contact with the strip material T to quench it.

By this heating and quenching, solute atoms in the age-hardenable copper alloy are uniformly distributed, and solution treatment is performed. The inside of the solution treatment process heating furnace 4 is kept in an inert gas atmosphere such as nitrogen gas. However, the present invention is not limited to this, and a reducing gas atmosphere or a weakly oxidizing atmosphere may be used. The type of the heating mechanism 6 is not limited, and may be any type such as electric resistance heating, burner heating, and high frequency induction heating.

The solution treatment is to heat the copper alloy to a temperature higher than the solubility curve of the solid solution formed by the solute / solvent contained in the copper alloy, uniformly distribute the solute atoms as the solid solution, and then precipitate the solute again. It is an operation of quenching before it is done. The heating temperature and the heating time required for the solution treatment differ depending on the material of the strip material T.

The material of the strip material T is 50 wt% of copper.
Including the above, Be, Mg, Ca, Ti, Zr, Hf, V,
Nb, Ta, Cr, Mo, W, Mn, Fe, Co, R
h, Ir, Ni, Pd, Pt, Ag, Au, Zn, C
d, B, Al, Ga, In, Tl, C, Si, Ge, S
n, Pb, P, As, Sb, Bi, O, S, Se, T
It is preferable to contain 0.01 to 49 wt% of one or more elements selected from e and rare earth elements.

Among these, the preferable composition of the age-hardenable copper alloy and the heating temperature and heating time suitable for the solution treatment of the alloy are as follows. The heating temperature and heating time suitable for the age hardening treatment described later are also shown.

(1) Be: 0.005 to 3 wt%, N
i: 0.002 to 3 wt%, Co: 0.0002 to 0.
9 wt%, inevitable impurities, and Cu: balance. The solution treatment in this case is performed under the condition of 600 to 950 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 580 ° C. × 0.0.
It is preferable to carry out under conditions of 5 to 600 minutes.

(2) Composition of Ag: 0.08 to 5 wt%, inevitable impurities, and Cu: balance. The solution treatment in this case is performed under the conditions of 600 to 900 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 580 ° C. × 0.05 to
It is preferable to carry out under the condition of 600 minutes.

(3) Sn: 0.5-4 wt%, Ni:
0.5-3 wt%, Si: 0.05-0.5 wt%, Z
n: 0.01 to 0.8 wt%, unavoidable impurities, and C
u: Composition of the balance. The solution heat treatment in this case is 600 to 95.
It is preferable that the treatment is performed under conditions of 0 ° C. × 0.05 to 30 minutes, and the age hardening treatment is performed under the conditions of 250 to 550 ° C. × 0.05 to 600 minutes.

(4) Cr: 0.1 to 0.6 wt%, Z
r: 0.0002 to 0.3 wt%, Si: 0.0002
~ 0.1 wt%, Al: 0.0002-0.2 wt%,
Sn: 0.0002 to 0.3 wt%, Mg: 0.000
2 to 0.2 wt%, Zn: 0.0002 to 0.5 wt
%, Unavoidable impurities, and Cu: composition of balance. The solution treatment in this case is performed under the condition of 600 to 980 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 590 ° C. ×
It is preferable to carry out the condition for 0.05 to 600 minutes.

(5) Fe: 0.3 to 1.8 wt%, S
n: 0.01 to 3 wt%, P: 0.003 to 0.4 wt
%, Unavoidable impurities, and Cu: composition of balance. The solution treatment in this case is performed under the conditions of 600 to 980 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 580 ° C. ×
It is preferable to carry out the condition for 0.05 to 600 minutes.

(6) Zr: 0.01 to 0.3 wt%,
Inevitable impurities, and Cu: the balance composition. In this case, the solution treatment is performed under the condition of 700 to 1000 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 600 ° C. × 0.
It is preferable to carry out under conditions of 05 to 600 minutes.

(7) Ni: 0.3-4 wt%, Si:
0.02-1 wt%, Sn: 0.003-1 wt%, Z
n: 0.003 to 3 wt%, Mg: 0.0002 to 0.
2 wt%, inevitable impurities, and Cu: the balance composition. The solution treatment in this case is 600 to 950 ° C. × 0.05 to 3
It is performed under the condition of 0 minutes, and the age hardening treatment is 250 to 550.
It is preferable to carry out under the condition of ℃ × 0.05 to 600 minutes.

(8) Fe: 0.05 to 0.3 wt%,
P: 0.003 to 0.1 wt%, inevitable impurities, and Cu: the composition of the balance. The solution treatment in this case is 500 to 9
It is preferable to perform the treatment at 50 ° C. × 0.05 to 30 minutes, and the age hardening treatment to the condition of 250 to 480 ° C. × 0.05 to 600 minutes.

(9) Fe: 1.5 to 3 wt%, P:
0.003 to 0.4 wt%, Zn: 0.01 to 0.5 w
t%, Mg: 0.0002 to 0.2 wt%, Ni: 0.
001 to 0.2 wt%, Sn: 0.001 to 0.2 wt
%, Unavoidable impurities, and Cu: composition of balance. The solution treatment in this case is performed under the condition of 700 to 980 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 680 ° C. ×
It is preferable to carry out the condition for 0.05 to 600 minutes.

(10) Ti: 0.03-4 wt%, F
e: 0.002-0.9 wt%, Mg: 0.0002-
0.2 wt%, unavoidable impurities, and Cu: balance composition, and the solution treatment is 560 to 980 ° C. × 0.05.
~ 30 minutes, the age hardening treatment is 250 ~ 5
It is preferable to carry out under conditions of 50 ° C. × 0.05 to 600 minutes.

(11) Mg: 0.1 to 0.9 wt%,
P: 0.0002 to 0.2 wt%, Sn: 0.0002
~ 0.3 wt%, Be: 0.0001-0.3 wt%,
Inevitable impurities, and Cu: the balance composition. The solution treatment in this case is performed under the condition of 550 to 950 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 180 to 500 ° C. × 0.0.
It is preferable to carry out under conditions of 5 to 600 minutes.

(12) Co: 0.02 to 3 wt%,
P: 0.0003 to 0.2 wt%, inevitable impurities, and Cu: the composition of the balance. The solution treatment in this case is 650 to
It is preferable to perform the treatment at 980 ° C. for 0.05 to 30 minutes, and the age hardening treatment to be performed at 250 to 600 ° C. for 0.05 to 600 minutes.

The strip T which has passed through the heating furnace 4 is passed through a slitter 8 having a plurality of slitter rolls arranged so that the outer peripheral edges thereof are meshed with each other, and divided into a plurality of strips T1 having a constant width. The strip | belt material T1 divided | segmented passes through the roll 10, and is wound up by the some ricoiler 12. Each recoiler 12
When a sufficient amount of the strip material T1 has been accumulated, the apparatus is stopped, the coil of the strip material T1 is removed from the ricoiler 12, and the strip material T1 is set in the embossing / electric sewing device shown in FIG. However, in the present invention, the strip material T does not necessarily have to be continuously divided after the heat treatment. The division may be performed as needed.

Reference numeral 20 in FIG. 2 denotes an uncoiler for continuously feeding the solution-treated strip T1 from its coil, and the strip T1 fed out is opposed to each other via a pair of pressing rolls 22. Arranged fin rolling roll 24
And between the receiving rolls 26. In this embodiment, the fin rolling roll 24 and the receiving roll 26 form an embossing mechanism. By the fin rolling roll 24, for example, linear fins and grooves having a constant angle with respect to the longitudinal direction of the strip T1 are formed on the surface of the strip T1, while the strip T1 abutting on the receiving roll 26 is formed. The back side remains smooth. However, the type of embossing is not limited to the formation of linear fins and grooves, and an uneven structure of any shape such as dimples may be formed. Also, embossing may not be performed depending on the use of the tube.

In the embossing, the strip material T1
Since the solution heat treatment is performed in advance and the hardness of the strip material T1 is reduced, the pressing force required for embossing can be small, the fin rolling roll 24 is less worn, and the material is deformed cheaply. Easy deep embossing.

The sheet material T rolled by the fin rolling roll 24 and the receiving roll 26 is a pair of rolls 2.
8 through which the rolling separator 3 is gradually rolled into a tubular shape through a plurality of pairs of forming rolls 30.
The gap amount between the both edges to be abutted by 2 is kept constant, and the both edges are heated by the induction heating coil 34. In this embodiment, the strip material T is rounded so that the fins are located on the inner peripheral surface side, but conversely, the strip material T1 can be rounded so that the fins are located on the outer peripheral surface side.

The strip material T1 formed into a tubular shape and heated is
The pair of squeeze rolls 36 are passed through, and both side edges heated by being pressed from both sides are butted against each other and welded. At this time, since the strip material T1 is subjected to the solution treatment and softened, roll forming and welding are stably performed. Therefore, it becomes possible to improve the stability of the welding strength. Since a bead (upset) protruding by plastic flow is formed on the outer peripheral surface of the welded pipe P (welded pipe) thus welded, a bead cutter 38 for cutting the bead is provided.

The welded pipe P whose bead is cut is the cooling tank 4
After passing 0 through forced cooling, a plurality of pairs of sizing rolls 42 are passed through and the diameter is reduced to a predetermined outer diameter. Furthermore, the reduced diameter welded pipe P is used in the rough coiler 44.
Is wound up in. When the coil wound by the rough coiler 44 becomes large to some extent, the apparatus is stopped and the molding process is started.

In the forming process, the welded pipe P
While unwinding, the welded pipe P is cut into a certain length and further shaped into a predetermined product shape. In the present invention, the product shape is not limited, but for example, a straight straight tube with straightened bend, a U-shaped tube as shown in FIG. 3 attached to a heat exchanger such as a general air conditioner or a refrigerating device. Another example is a spiral tube as shown in FIG. 4 used in another type of heat exchanger. Also in this case, since the material of the welded pipe P is not yet hardened, there is an advantage that molding at this point can be easily performed.

Next, the welded pipe P formed into a product shape is heated to perform an age hardening treatment for precipitating solute atoms in the base material and hardening the welded pipe P. Age hardening is a phenomenon in which a supersaturated solid solution of an alloy hardens over time,
What occurs when left at room temperature is called room temperature aging or natural aging, and what occurs when heated is called high temperature aging or artificial aging. The latter is used by the present invention. When the supersaturated solid solution is heated to the two-phase region, fine precipitates are formed and hardened. However, if the material is heated for too long, the precipitates become coarse and the hardness rather decreases. Some of the fine precipitates are also called G-P aggregates, which are plate-like or spherical particles with a size of about 10 nm or less that are formed by the aggregation of solute atoms in the solid solution at the early stage of age hardening of the alloy. There is also a collection of.

The heating temperature and the heating time required for the conditions of the age hardening treatment differ depending on the material of the strip T as described above.

According to the above-mentioned method for manufacturing an age-hardened welded pipe, the strip material T is subjected to solution treatment so that the solute atoms are uniformly distributed and the strip material T is softened, so that roll forming and welding are stably performed. It can be performed smoothly and the welding strength can be made uniform and improved over the entire length of the pipe. Moreover, when performing embossing as mentioned above, embossing can be performed easily and fully.
Furthermore, after the embossing process, the pipe forming process, and the welding process are completed, the welded pipe P is heated to precipitate fine crystals of the solute in the base material and harden the welded pipe P, so that the welded pipe P has a final sufficient strength. It is possible to obtain a welded pipe P having

Since the age-hardened welded pipe of the present invention has sufficient strength, it has little change in shape during use and is excellent in self-supporting property. Furthermore, by applying a shape such as a U-shape or a spiral shape and then subjecting it to age hardening treatment,
Although it is easy to give a shape, it is possible to prevent deformation from the final shape, and it is possible to obtain a heat transfer tube P having an arbitrary shape with high shape accuracy and high strength and high self-sustainability.

[0039]

Examples Using age-hardening copper alloy strips (width 450 mm × thickness 0.5 mm) having the compositions shown in Table 1, solution treatment under the conditions shown in Table 1, height 0.2 mm Fin rolling with a pitch of 0.47 mm, roll forming, butt welding, and aging treatment under the conditions described in Table 1, and the heat transfer tubes of Examples 1 to 12 (outer diameter 9.52 mm, wall thickness 0.3 mm) Got On the other hand, using phosphorus deoxidized copper (JIS alloy No. C1220) which is widely used as the material of the heat transfer tube, the same fin rolling, roll forming and butt welding as the above were performed, and the heat transfer tube of the same size as the example was compared. Got as an example.

Next, the burst strength and the number of times of repeated withstand pressure were measured for the heat transfer tubes of Examples 1 to 12 and Comparative Example. The burst strength was measured according to the JIS H3320 test method by applying water pressure to the inside of the pipe and measuring the water pressure when the pipe burst. JI
According to the SZ2273 test method, a water pressure of 2.94 MPa was repeatedly applied to the inside of the pipe, and the number of times the pipe ruptured was measured. The results are shown in Table 1.

[0041]

[Table 1]

As is clear from Table 1, the hardness of the strips of Examples 1 to 12 in the state of being subjected to the solution heat treatment is about the same as the hardness of the strips of the comparative example. Forming and welding were stable and easy. On the other hand, the hardness of Examples 1 to 12 after the age hardening treatment was markedly higher than that of Comparative Example, and the results of the burst strength and the repeated pressure resistance test were also excellent.

[0043]

As described above, according to the method for manufacturing an age-hardened welded pipe according to the present invention, the solution forming treatment is performed on the strip material to uniformly distribute the solute atoms, so that the roll forming and the welding are stabilized. Easy to do,
It is possible to prevent variations in the strength of the welded portion due to uneven welding.

Further, even when the inner surface of the pipe is embossed, the embossing can be easily performed, and a concavo-convex structure having a necessary and sufficient depth can be formed without shortening the life of the embossing device. .

Furthermore, after the welding process is completed, the welded pipe is heated to precipitate fine crystals of solute in the base metal and harden the welded pipe, so that finally a welded pipe having sufficient strength can be obtained. It is possible.

On the other hand, since the age-hardened welded pipe of the present invention has sufficient strength, the shape change during use is small and the self-standing property is excellent.

[Brief description of drawings]

FIG. 1 is a side view showing a heat treatment and slitter device used in an embodiment of a method for manufacturing an age-hardened welded pipe according to the present invention.

FIG. 2 is a side view showing an embossing / electric sewing device used in the same embodiment.

FIG. 3 is a plan view showing a U-shaped tube as an example of an age hardening welded tube.

FIG. 4 is a plan view showing a spiral tube as another example of the age hardening welded tube.

[Explanation of symbols]

T Strip made of age hardening copper alloy 1 Uncoiler 4 heating furnace 8 slitters T1 solution-treated strip 12 Ricoira 20 Uncoilers 24 fin rolling roll 26 Receiver roll 30 forming rolls 34 Induction heating coil 36 Squeeze Roll P welded pipe 44 rough coiler

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) C22F 1/08 C22F 1/08 L MN P B21C 37/08 B21C 37/08 F 37/083 37/083 Z B21D 5 / 12 B21D 5/12 J 22/08 22/08 // C22C 9/00 C22C 9/00 9/01 9/01 9/02 9/02 9/04 9/04 9/06 9/06 9/10 9/10 C22F 1/00 602 C22F 1/00 602 626 626 630 630A 630K 630M 651 651A 673 673 682 682 691 691B 691C

Claims (16)

[Claims] 1. A solution treatment step of performing a solution treatment for uniformly distributing solute atoms by heating a strip made of an age-hardenable copper alloy, and a plurality of forming rolls formed by the solution treatment. Through a tube forming step to form a tubular shape, a welding step in which both end edges of a tubular material that has been formed into a tubular shape are heated and then butt welded, and the solute atom is heated to heat the welded tube obtained by the welding A process for producing an age-hardened welded pipe, which comprises: an age-hardening treatment step of precipitating it inside and hardening the welded pipe. 2. The method of manufacturing an age-hardened welded pipe according to claim 1, further comprising an embossing step of performing embossing on at least one surface of the solution-treated strip. 3. The age hardening copper alloy contains 50 wt% of copper.
%, Be, Mg, Ca, Ti, Zr, Hf,
V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co,
Rh, Ir, Ni, Pd, Pt, Ag, Au, Zn, C
d, B, Al, Ga, In, Tl, C, Si, Ge, S
n, Pb, P, As, Sb, Bi, O, S, Se, T
3. The method for producing an age-hardened welded pipe according to claim 1, further comprising 0.01 to 49 wt% of one or more elements selected from e and rare earth elements. 4. The age-hardenable copper alloy is Be: 0.0.
05-3 wt%, Ni: 0.002-3 wt%, Co:
0.0002 to 0.9 wt%, inevitable impurities, and C
u: The balance is the composition, and the solution treatment is 600 to 95.
The age hardening welded pipe according to claim 1 or 2, wherein the age hardening treatment is performed under conditions of 0 ° C x 0.05 to 30 minutes and the age hardening treatment is performed under conditions of 250 to 580 ° C x 0.05 to 600 minutes. Manufacturing method. 5. The age-hardenable copper alloy is Ag: 0.0
8 to 5 wt%, inevitable impurities, and Cu: the balance composition, and the solution treatment is 600 to 900 ° C. × 0.05.
~ 30 minutes, the age hardening treatment is 250 ~ 5
The method for producing an age-hardened welded pipe according to claim 1 or 2, which is performed under the conditions of 80 ° C x 0.05 to 600 minutes. 6. The age-hardenable copper alloy is Sn: 0.5.
~ 4 wt%, Ni: 0.5-3 wt%, Si: 0.05
.About.0.5 wt%, Zn: 0.01 to 0.8 wt%, unavoidable impurities, and Cu: balance composition, and the solution treatment is performed at 600 to 950 ° C. for 0.05 to 30 minutes. The age hardening treatment is 250 to 550 ° C. × 0.05 to
The method for producing an age-hardened welded pipe according to claim 1 or 2, which is performed under the condition of 600 minutes. 7. The age-hardenable copper alloy is Cr: 0.1.
~ 0.6 wt%, Zr: 0.0002 to 0.3 wt%,
Si: 0.0002 to 0.1 wt%, Al: 0.000
2 to 0.2 wt%, Sn: 0.0002 to 0.3 wt
%, Mg: 0.0002 to 0.2 wt%, Zn: 0.0
002 to 0.5 wt%, inevitable impurities, and Cu: balance composition, and the solution treatment is 600 to 980 ° C.
It is performed for 0.05 to 30 minutes, and the age hardening treatment is 2
The method for producing an age-hardened welded pipe according to claim 1 or 2, which is performed under conditions of 50 to 590 ° C x 0.05 to 600 minutes. 8. The age hardening copper alloy is Fe: 0.3
-1.8 wt%, Sn: 0.01-3 wt%, P: 0.
003 to 0.4 wt%, unavoidable impurities, and Cu: balance composition, and the solution treatment is 600 to 980 ° C.
It is performed for 0.05 to 30 minutes, and the age hardening treatment is 2
The method for producing an age-hardened welded pipe according to claim 1 or 2, which is carried out under the condition of 50 to 580 ° C x 0.05 to 600 minutes. 9. The age-hardenable copper alloy is Zr: 0.0.
1 to 0.3 wt%, inevitable impurities, and Cu: the balance composition, and the solution treatment is 700 to 1000 ° C.
It is performed for 0.05 to 30 minutes, and the age hardening treatment is 2
The method for producing an age-hardened welded pipe according to claim 1 or 2, which is carried out under conditions of 50 to 600 ° C x 0.05 to 600 minutes. 10. The age-hardenable copper alloy is Ni: 0.
3-4 wt%, Si: 0.02-1 wt%, Sn: 0.
003 to 1 wt%, Zn: 0.003 to 3 wt%, M
g: 0.0002 to 0.2 wt%, inevitable impurities, and Cu: balance composition, and the solution treatment is 600 to
The age hardening welded pipe according to claim 1 or 2, wherein the age hardening treatment is performed under conditions of 950 ° C x 0.05 to 30 minutes, and the age hardening treatment is performed under conditions of 250 to 550 ° C x 0.05 to 600 minutes. Manufacturing method. 11. The age-hardenable copper alloy is Fe: 0.
05-0.3 wt%, P: 0.003-0.1 wt%,
Inevitable impurities, and Cu: The balance of composition, the solution treatment is performed under the conditions of 500 to 950 ° C. × 0.05 to 30 minutes, and the age hardening treatment is 250 to 480 ° C. × 0.0.
The age-hardened welded pipe manufacturing method according to claim 1 or 2, which is performed under the condition of 5 to 600 minutes. 12. The age hardening copper alloy is Fe: 1.
5 to 3 wt%, P: 0.003 to 0.4 wt%, Zn:
0.01-0.5 wt%, Mg: 0.0002-0.2
wt%, Ni: 0.001-0.2 wt%, Sn: 0.
001 to 0.2 wt%, unavoidable impurities, and Cu: balance, and the solution treatment is 700 to 980 ° C.
It is performed for 0.05 to 30 minutes, and the age hardening treatment is 2
The method for producing an age-hardened welded pipe according to claim 1 or 2, which is carried out under the conditions of 50 to 680 ° C x 0.05 to 600 minutes. 13. The age-hardenable copper alloy is Ti: 0.
03-4 wt%, Fe: 0.002-0.9 wt%, M
g: 0.0002 to 0.2 wt%, unavoidable impurities, and Cu: balance composition, and the solution treatment is 560 to
The age-hardened welded pipe according to claim 1 or 2, wherein the age-hardening treatment is performed under conditions of 980 ° C x 0.05-30 minutes, and the age hardening treatment is performed under conditions of 250-550 ° C x 0.05-600 minutes. Manufacturing method. 14. The age hardening copper alloy is Mg: 0.
1 to 0.9 wt%, P: 0.0002 to 0.2 wt%,
Sn: 0.0002 to 0.3 wt%, Be: 0.000
1 to 0.3 wt%, inevitable impurities, and Cu: balance composition, and the solution treatment is 550 to 950 ° C. × 0.
It is performed under the condition of 05 to 30 minutes, and the age hardening treatment is 250
The process for producing an age-hardened welded pipe according to claim 1 or 2, wherein the process is carried out under conditions of ~ 500 ° C x 0.05-600 minutes. 15. The age-hardenable copper alloy is Co: 0.
02 to 3 wt%, P: 0.0003 to 0.2 wt%, unavoidable impurities, and Cu: balance, and the solution treatment is performed under the condition of 650 to 980 ° C. × 0.05 to 30 minutes, The age hardening treatment is 250 to 600 ° C. × 0.05
The process for producing an age-hardened welded pipe according to claim 1 or 2, wherein the process is performed under conditions of about 600 minutes. 16. An age hardening welded pipe manufactured by the method for manufacturing an age hardening welded pipe according to claim 1.