JP2001170794A - High-strength aluminum alloy clad material for heat exchanger excellent in tube manufacturing property and corrosion resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-strength aluminum alloy clad metal for a heat exchanger which is excellent in tube manufacturing property and corrosion resistance, and which is suitable for a material for a working fluid passage of the heat exchanger for an automobile including a radiator and a heater, and can be made thinner. SOLUTION: Relating to the aluminum alloy clad metal that a sacrifice an anode is cladded on one surface of a core and an Al-Si brazing filler metal is cladded on the other surface, the core has the composition consisting of 0.6-2.0% Mn, 0.3-1.0% Cu, >=0.06% to <0.5% Si, 0.01-0.4% Fe, and the valance Al alloy consisting of Al with inevitable impurities, the sacrifice anode consists of aluminum alloy containing one or two or more kinds of 0.5-4.0% Zn, 0.005-1.0% In, and 0.01-0.1% Sn, further containing 0.01-<0.5% Si and 0.01-0.5% Fe and the balance Al with inevitable impurities, the matrix of the core is of a fibrous structure, and the tensile strength of the clad metal is 170-260 MPa.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength aluminum alloy clad material for a heat exchanger having excellent pipe forming properties and corrosion resistance, and more particularly, to a fluid for a heat exchanger joined by brazing such as a radiator or a heater of an automobile. The present invention relates to a high-strength aluminum alloy clad material for a heat exchanger, which can be suitably used as a passage constituent material (tube material), and is excellent in pipe formability and corrosion resistance particularly when formed as a flat welded tube.

[0002]

2. Description of the Related Art Conventionally, JIS A30 has been used as a tube material for heat exchangers for automobiles such as radiators and heater cores.
Al such as 03 alloy, 3005 alloy and 3205 alloy
-Mn-based alloy is used as the core material, and JIS
BA4343 alloy, 4045 alloy, 4047 alloy,
An Al-Si alloy such as 4104 alloy is clad with a brazing material, and the other surface is coated with an Al-Zn alloy or Al-Zn.
-A three-layer clad material of an aluminum alloy clad with a sacrificial anode material made of an Mg-based alloy is used.

An Al-Si brazing material is clad for joining a tube to a fin and for brazing a tube to a header plate. As a brazing method, the brazing method is performed in an inert gas atmosphere. A brazing method using a halide flux is generally applied, but a vacuum brazing method may be employed. On the other hand, the sacrificial anode material forms the inner surface of the tube and contacts the working fluid during use of the heat exchanger to exert a sacrificial anode effect, thereby preventing pitting and crevice corrosion of the core material.

A tube (flat tube) used for a radiator, a heater or the like of an automobile is a three-layer clad plate material consisting of a brazing material / a core material / a sacrificial anode material, which is cut into a band with a predetermined width to form a welded flat tube. The material is formed into a tubular shape with the sacrificial anode material inside, and the end faces of the material are butt-welded continuously and then welded, then the bead of the welded portion is cut off and then formed into a flat tubular shape. It is manufactured by cutting to a predetermined length.

[0005] In recent years, environmental problems, and also energy saving,
The demand for lower cost has led to a reduction in the weight of automobiles.With this, there has been a strong demand for weight reduction of heat exchangers for automobiles.Thus, it is necessary to further reduce the thickness of heat exchanger components such as tube materials. It is becoming necessary. However, when thinning the tube material used for radiators and heaters and adding various elements to maintain a specific strength, the corrosion resistance is impaired, and the thinning of the material causes the flatness of the welded flat tube to deteriorate. As a result, the productivity of the heat exchanger is significantly impaired, and the durability of the heat exchanger becomes problematic.

[0006] Usually, in the manufacture of tubes (flat tubes) used for radiators and heaters of automobiles, forming processing to bend into a tube shape, butt welding of end faces, bead removal of welded portions, removal of flat tubes, and the like. The forming process and the cutting process to a predetermined size are performed using a continuous line under a high speed condition of about 100 m / min. Therefore, various defects are likely to occur in the welded portion of the formed flat welded tube, and quality problems are likely to occur.Therefore, from the viewpoint of high quality and high productivity, a material having excellent pipe formability is required. Is desired.

[0007] As a method for improving the pipe formability of a flat welded tube, for example, the method of producing a brazing sheet is improved (Japanese Patent Application Laid-Open No. 7-286250), or the crystal grain size of a core material is controlled (Japanese Patent Application Laid-Open No. 8-1996). -283891) to improve the weldability, limit the strength characteristics of the brazing sheet (JP-A-4-66292), and control the ear ratio (JP-A-4-276039). Thus, there has been proposed a method of improving the cutability of a flat welded tube. Although the pipe formability of the flat welded tube can be improved to some extent by the above means, depending on the material used as the material becomes thinner, the quality of the pipe formability may vary, and the product yield may be reduced. From the viewpoints of improvement in cost and cost reduction, further improvement in pipe formability is desired.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems in the technical field, and to develop a tube forming material and a wax for a working fluid passage for a heat exchanger having a reduced thickness. It was made as a result of repeated experiments and studies on the effects of alloy components and their combinations on the weldability, corrosion resistance, strength characteristics, and the effect of the material structure, and the purpose was to excel in pipe forming properties, that is, An object of the present invention is to provide an aluminum alloy clad material for a heat exchanger, which can stably perform bending processing into a pipe shape and butt welding of end faces, and is excellent in corrosion resistance and strength characteristics.

[0009]

A high-strength aluminum alloy clad material for a heat exchanger having excellent pipe forming properties and corrosion resistance according to the first aspect of the present invention for solving the above-mentioned problems is sacrificed on one surface of a core material. Anode material is clad and the other surface is Al
-An aluminum alloy clad material clad with a Si-based brazing material, wherein the core material is Mn: 0.6 to 2.0%;
u: 0.3 to 1.0%, Si: 0.06% or more and 0.5%
, Fe: 0.01 to 0.4%, with the balance being Al
And an aluminum alloy consisting of unavoidable impurities,
The sacrificial anode material is Zn: 0.5 to 4.0%, In: 0.0
0.05 to 0.1%, Sn: 0.01 to 0.1%, and one or more of the following.
0.5%, Fe: 0.01 to 0.5%, the remainder is composed of an aluminum alloy composed of Al and unavoidable impurities, the matrix of the core material is a fiber structure, and the tensile strength of the clad material is low. It is 170 to 260 MPa.

According to a second aspect of the present invention, there is provided a high-strength aluminum alloy clad material for a heat exchanger having excellent pipe formability and corrosion resistance, wherein the core material is further made of Ti: 0.0
It is characterized by containing 6-0.35%.

[0011] The clad material for a heat exchanger having excellent pipe forming properties and corrosion resistance according to claim 3 of the present invention is claimed in claim 1 or 2.
Wherein the core material further contains Mg: 0.06 to 0.4%.

According to a fourth aspect of the present invention, there is provided a clad material for a heat exchanger having excellent tube formability and corrosion resistance, wherein the sacrificial anode material further contains 0.5 to 2.5% of Mg. It is characterized by doing.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The reasons for limiting the components constituting the high-strength aluminum alloy clad material for heat exchangers of the present invention, which are excellent in pipe formability and corrosion resistance, and the operation thereof will be described in detail below.

<Core Alloy Component> Mn functions to improve the strength of the core. The preferred content of Mn is in the range of 0.6 to 2.0%, and the content is 0.6%.
If the amount is less than 2.0%, a sufficient effect cannot be obtained. If the amount exceeds 2.0%, a coarse compound is generated at the time of casting, and the rolling workability of the material is deteriorated, so that it is difficult to obtain a sound material.

Cu increases the potential difference between the sacrificial anode material and the brazing material by increasing the strength of the core material and making the potential noble, thereby increasing the corrosion prevention effect of the sacrificial anode material and the sacrificial anode effect of the brazing material. It increases the action and contributes to the improvement of the corrosion resistance of the clad material. Further, Cu in the core material diffuses into the sacrificial anode material and the brazing material during the brazing heating to form a gentle concentration gradient. As a result, the potential on the core material side becomes noble, the potential on the surface side of the sacrificial anode material and the brazing material becomes low, and a gentle potential gradient is formed in the sacrificial anode material and the brazing material. Use a general corrosion type that spreads. The preferred content of Cu is 0.3 to 1.0.
%, The effect is not sufficient if the content is less than 0.3%, and if it exceeds 1.0%, the melting point is lowered and local melting may occur during brazing.

[0016] Si has the effect of increasing the strength of the core material. However, if it is contained in an amount of 0.5% or more, the core material will corrode when used for a long period of time in a particularly severe corrosive environment, leading to penetration corrosion. Therefore, the content is preferably set to less than 0.5%.
A preferred content range is 0.06% or more and less than 0.5%.

Although Fe is contained as an impurity in the aluminum base metal, it acts as a cathode with respect to the aluminum base material, and thus acts to reduce the corrosion resistance of the core material. Therefore, its content is desirably kept as low as possible, but a high-purity aluminum ingot with an extremely low Fe content is expensive and cannot be put to practical use. The content of Fe is set to 0.01 to 0.4%.

[0018] Ti functions to further improve the corrosion resistance of the core material. That is, Ti is divided into a high-concentration region and a low-concentration region, which are alternately distributed in the plate thickness direction to form a layer, and the region with a low Ti concentration preferentially corrodes as compared with the region with a high concentration. Since the form is layered, the progress of corrosion in the thickness direction is prevented, and as a result, the pitting resistance of the material is improved. The preferable content of Ti is 0.1.
06-0.35%, and the content is 0.06%.
If it is less than 0.3%, the effect is not sufficient, and if it exceeds 0.35%, a coarse compound is generated at the time of casting, and the rolling workability of the raw material is hindered, and it is difficult to obtain a sound material.

Mg acts to increase the strength of the core material. The preferable content of Mg is in the range of 0.06 to 0.4%, and if the content is less than 0.06%, a sufficient effect cannot be obtained. Mg ₂
It generates Si and significantly degrades corrosion resistance.

As other elements, unavoidable impurity elements such as Zn, Cr and Zr are accepted to be contained in the core material within a range not to impair the effects of the present invention. However, Zn
In this case, since the potential of the core material is made low and the potential difference between the sacrificial anode material and the brazing material is reduced, thereby lowering the corrosion resistance, the content is desirably limited to 0.2% or less. Also, C
Although r and Zr do not prevent the addition of r and Zr for the purpose of, for example, making the structure finer, the content thereof is preferably limited to 0.3% or less because there is a risk of impairing the workability.

<Constituents of brazing alloy> The brazing alloy in the present invention includes Al-Si, Al-Si-Mg
System, Al-Si-Mg-Bi system, Al-Si-Mg-B
e system, Al-Si-Bi system, Al-Si-Be system, Al-
A brazing material made of an Al-Si alloy such as a Si-Bi-Be alloy, for example, JIS BA4343 alloy (Al-7.5
% Si), alloy 4045 (Al-10% Si), 40
47 alloy (Al-12% Si), 4104 alloy (Al-
It is appropriately selected from conventionally known aluminum alloys such as 10% Si-1.5% Mg-0.1% Bi).

In order to improve the brazing property, a small amount of, for example, 0.2% or less of Bi,
One, two or more elements selected from Be, Sr, Li, and Na can be contained. In addition, by making the potential of the brazing material base, the potential difference of the brazing material with respect to the core material is increased, and in order to improve the corrosion resistance of the clad material by giving a sacrificial anode effect to the brazing material, a small amount of Zn, One or more of In and Sn may be contained.

<Sacrifice Anode Material Alloy Constituent> Zn makes the potential of the sacrificial anode material low, imparts an excellent sacrificial anode effect to the core material to the sacrificial anode material, and completely modifies the form of corrosion of the clad material. It functions as a mold to suppress pitting and crevice corrosion. The preferred content of Zn is in the range of 0.5 to 4.0%. If the content is less than 0.5%, a sufficient effect cannot be obtained, and if the content exceeds 4.0%, the effect is saturated. Therefore, further effects cannot be expected, and the self-corrosion resistance of the sacrificial anode material itself is reduced to increase corrosion consumption, so that the sacrificial anode effect cannot be maintained for a long time.

In makes the potential of the sacrificial anode material low, imparts an excellent sacrificial anode effect to the core material to the sacrificial anode material, changes the form of corrosion of the clad material to a complete corrosion type, and removes pitting and gaps. Functions to suppress corrosion. The preferred In content is in the range of 0.005 to 0.1%. If the content is less than 0.005%, the desired effect cannot be expected. Corrosion resistance of the sacrificial anode material increases due to a decrease in corrosion resistance, and also, the rolling processability decreases.

Sn also makes the potential of the sacrificial anode material low, imparts an excellent sacrificial anode effect to the core material to the sacrificial anode material, changes the form of corrosion of the clad material to a full-corrosion type, and eliminates pitting and gaps. Functions to suppress corrosion. The preferred content of Sn is in the range of 0.01 to 0.1%. If the content is less than 0.01%, the desired effect cannot be expected. Corrosion resistance of the sacrificial anode material increases due to a decrease in corrosion resistance, and also, the rolling processability decreases.

Si and Fe are present as impurities in the aluminum ingot, and both act as a cathode with respect to the aluminum base material to lower the self-corrosion resistance. Therefore, their contents are not more than 0.5% of Si and 0.5% of Fe.
% Is desirable. However, Si
And high-purity aluminum ingot with extremely low content of Fe cannot be put to practical use at high cost.
Limited to 0.5%.

Mg acts to increase the strength of the clad material. The preferable Mg content is in the range of 0.5 to 2.5%, and if the content is less than 0.5%, a sufficient effect cannot be obtained. And it is difficult to obtain a sound material.

As other elements, Mn, Cu, Cr,
Zr, Ti, and the like may be included in a range that does not hinder the effects of the present invention. However, since Mn and Cu make the potential of the sacrificial anode material noble and reduce the potential difference from the core material to reduce the sacrificial anode effect, it is desirable to limit the content of each to 0.3% or less. Also, Cr,
Each element of Zr and Ti does not hinder addition for the purpose of controlling the crystal grain size of the raw material, but each may be added in an amount not exceeding 0.3% because it may impair workability. desirable.

<Structure of the core material> In the present invention, it is an important requirement that the structure of the core material matrix be a fiber structure. By forming the core material matrix into a fiber structure, the formability of the clad material into a tubular shape and the butt-weldability of the end surfaces in the tube-forming process are improved, and variations in the shape and quality of the tube-forming can be reduced. When the structure of the core material is a recrystallized structure or a mixed structure of a fiber structure and a recrystallized structure, the processability of forming the clad material into a tube shape in the tube forming process may be non-uniform. However, since the butt weldability of the end faces is reduced, welding defects are likely to occur, and the pressure resistance of the flat welded pipe after pipe formation is reduced. Decrease. As a method for forming the core material matrix into a fiber structure, it is preferable to adopt a method of adjusting the annealing treatment temperature at the time of manufacturing the aluminum alloy clad material to a temperature lower than the recrystallization temperature of the core material alloy.

<Strength of clad material> In the present invention,
It is important to adjust the tensile strength of the aluminum alloy clad material before pipe forming to a range of 170 to 260 MPa. The tensile strength of the clad material before pipe forming affects the formability of the clad material into a tube shape and the butt weldability of the end face in the pipe forming process. 170M tensile strength
If the pressure is less than Pa, local deformation tends to occur at the time of forming into a tube shape, and butt welding becomes difficult. If the pressure exceeds 260 MPa, the springback at the time of forming into a tube shape becomes large, so that butt welding becomes difficult and sound It becomes difficult to obtain welded flat tubes. In addition, as a method for adjusting the strength of the clad material to the above-mentioned strength, a method of adjusting an annealing treatment temperature and a cold rolling work degree at the time of manufacturing the clad material can be adopted.

The aluminum alloy clad material for a heat exchanger of the present invention is formed by ingot-forming an aluminum alloy constituting a core material, a sacrificial anode material and a brazing material by, for example, a semi-continuous casting method.
After homogenization as necessary, each is hot-rolled to a predetermined thickness, then each material is combined, and hot-rolled to form a clad material according to a conventional method, and further cold-rolled to a predetermined thickness, if necessary. It is manufactured through a process of repeating annealing and cold rolling.

According to the structure of the present invention, the formability and weldability of the clad material are improved by forming the core material matrix into a fiber structure, and after the brazing by the action of Mn and Cu contained in the core material. Increase the strength, maintain the corrosion resistance under severe environment by adjusting the Si content, limit the content of Fe as an impurity and improve the self-corrosion resistance by including Ti, and furthermore, in the sacrificial anode material, By adjusting the amounts of Zn, In, and Sn added, a sacrificial anode effect is imparted to further improve the corrosion resistance of the clad material, and in particular, an aluminum alloy clad for a heat exchanger having excellent tube formability and corrosion resistance of a flat welded tube. Material.

[0033]

EXAMPLES Examples of the present invention will be more specifically described below in comparison with comparative examples. The present embodiment shows one embodiment of the present invention, and the present invention is not limited to this embodiment.

Example 1 An aluminum alloy for a core material having the composition shown in Table 1 was formed by continuous casting, and the obtained ingot was homogenized. Material. In addition, an aluminum alloy for a sacrificial anode material and an alloy for a brazing material having the composition shown in Table 2, JIS 4045 (Al-10% S
i) was cast and chamfered in the same manner as the alloy for the core material, and then hot-rolled to obtain a skin material having a thickness of 3 mm. Then, the brazing material and the sacrificial anode material were laminated on both sides of the core material. In addition, hot rolling was performed to obtain a clad material having a thickness of 3 mm.
After that, cold rolling, intermediate annealing, and final cold rolling were performed,
0.25mm thick three-layer clad material (tempered H14 material)
Was prepared. The structure and tensile strength of the clad material were changed by adjusting the intermediate annealing temperature and the degree of cold rolling.

A tensile test was performed on the clad material (hereinafter referred to as a test material) obtained by the above steps. In addition, the test material was polished from the brazing material surface side in the thickness direction to expose the core material surface, and the microstructure of the core material surface was observed with a microscope to examine the structure of the core material.

Further, the test material was coated with a fluoride-based flux (concentration: 3%) as a fluoride-based brazing heat treatment (hereinafter, referred to as NB heating) in the same manner as the brazing conditions. Heating was performed at 600 ° C. for 5 minutes, and a tensile test was performed on the test material after the heating.

For evaluation of pipe formability, the test material was cut into strips having a predetermined width, and a flat welded flat tube having a width of 16 mm and a height (thickness) of 1.8 mm was measured using a continuous flat-tube manufacturing apparatus. After the pipe was formed, a pressure test was performed inside the flat welded pipe, and the pressure resistance (breaking strength) was 5.0 MPa (50 kgf).
/ Cm ² ) or more is evaluated as good pipe-forming property (）), and the pipe-forming property is unstable if the pressure resistance is less than 5.0 MPa or the pipe-forming property is poor (×). evaluated.

For evaluation of corrosion resistance on the inner surface side (sacrificial anode material side)
For the single-plate brazed heating test piece,
After sealing (the brazing material side), Cl^-100 ppm, S
O_Four ^2-100 ppm, HCO_Three ^-100 ppm, Cu²⁺
Immerse in an aqueous solution containing 10 ppm, and 8 hours at 80 ° C
Heat, then leave to cool to room temperature for 16 hours
After a 12-week test,
By measuring the maximum corrosion depth from the inside surface
Was.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

Table 3 shows the test, measurement and evaluation results.
As shown in Table 3, the test material (cladding material) No. In any of 1 to 16, the structure of the material is all fibrous, and the tensile strength of the material is 170 MPa or more,
Excellent tube formability was exhibited. Moreover, the maximum corrosion depth after the inner surface immersion test was as shallow as 0.05 to 0.12 mm, indicating that the inner surface has excellent corrosion resistance. Each of the tensile strengths corresponding to after brazing showed an excellent strength of 140 MPa or more. In addition, it was confirmed that all the clad materials produced according to the present invention had no problem in productivity such as rolling workability of the material.

Comparative Example 1 An aluminum alloy for a core material having a composition shown in Table 4 was formed into a core material by ingot, homogenization treatment and facing in the same manner as in Example 1 to have a composition shown in Table 5. An aluminum alloy for a sacrificial anode material and an alloy for a brazing material, JIS 4045, were ingot-formed, face-milled, and hot-rolled in the same manner as in Example 1 to a length of 3.0 m.
In this case, a brazing material and a sacrificial anode material are superposed on both surfaces of the core material, and the same process as in Example 1 is performed.
A 25 mm three-layer clad material (tempered H14 material) was obtained. Various tests, measurements, and evaluations were performed using the obtained clad material as a test material in the same manner as in Example 1, and the results are shown in Tables 6 and 7.

[0044]

[Table 4]

[0045]

[Table 5]

[0046]

[Table 6]

[0047]

[Table 7]

As shown in Tables 6 and 7, the test materials No. All of Nos. 17 to 39 do not have sufficient performance as a clad material for a heat exchanger. That is, the test material No. 17 is Zn, In in the sacrificial anode material
Due to the low contents of Sn and Sn, the sacrificial anode effect was insufficient and the corrosion resistance was inferior, and a through hole was formed in the corrosion test on the inner surface side. Further, since a high-purity aluminum ingot having an extremely small Fe content in the alloy for a sacrificial anode material was employed, the cost was high and the alloy could not be put to practical use.

Test material No. In Nos. 18 and 19, since the content of Si and Fe in the sacrificial anode material was large, the self-corrosion resistance was reduced, and through holes were formed in the corrosion test on the inner surface side. Test material N
o. In Nos. 20 to 22, since the contents of Zn, In, and Sn in the sacrificial anode material are large, the sacrificial anode material after the corrosion test on the inner surface side is greatly consumed by corrosion, and the sacrificial anode effect does not last for a long time.

Test material No. 23 is Mg in the sacrificial anode material
Due to the large content, rolling of the material becomes difficult and a sound material cannot be obtained. In Test Material No. 24, since the Mn content of the core material was small, the tensile strength after NB heating was reduced. In No. 25, since the Mn content of the core material was too large, rolling of the material was difficult, and a sound material was not obtained.

Test material No. 26 is JIS 30 core material
Since it corresponds to the alloy material No. 03 and the Cu content in the core material is small, the tensile strength after NB heating is low, the corrosion resistance is also reduced, and a through hole is generated in the corrosion test on the inner surface side. Test material N
o. In No. 27, since the Cu content in the core material was too large, local melting occurred in the core material due to heating during brazing.

Test material No. Test material No. 28 has a low tensile strength after NB heating because of low Si content in the core material. Sample No. 29 had a large through-hole in the corrosion test on the inner surface side due to a large Si content in the core material. Test material No. 30
Is a high-purity aluminum ingot with extremely low Fe content in the core material alloy, so that the cost is high and it is not practical. In No. 31, the Fe content was too large and the corrosion resistance was poor, and a through-hole was formed in the corrosion test on the inner surface side.

Test material No. 32 has a small Ti content in the core material, so the maximum corrosion depth by the inner surface corrosion test is
Compared with the three-layer clad material according to the present invention, the test material No. In the case of No. 33, since the content of Ti in the core material is too large, rolling of the raw material becomes difficult and a sound material cannot be obtained.

Test material No. Test Material No. 34 has a low tensile strength after NB heating because the content of Mg in the core material is small. In No. 35, since the content of Mg in the core material was too large, the corrosion resistance was lowered, and a through hole was formed in the corrosion test on the inner surface side.

Test material No. In Nos. 36 and 37, since the structure of the core material was a recrystallized structure, butt welding was difficult, the pipe forming property was unstable, and the pressure resistance was insufficient. Test material No. Three
In No. 8, the tensile strength of the material was low, butt welding became difficult, and the pipe formability was reduced, so that a sound flat welded pipe could not be obtained. The test material No. In No. 39, since the tensile strength of the material was too high, butt welding was difficult and pipe making was difficult, and a sound flat welded pipe could not be obtained.

[0056]

As described above, the aluminum alloy clad material according to the present invention optimizes the strength of the material,
By controlling the structure of the core material matrix into a fibrous form and optimizing the components of the core material and the sacrificial anode material, a high-strength aluminum alloy clad material for a heat exchanger that achieves excellent tube formability and corrosion resistance is provided. You. The aluminum alloy clad material can be suitably used as a constituent material of a working fluid passage of a heat exchanger for an automobile, and the thickness of the material can be further reduced, and the productivity of a heat exchanger such as a radiator or a heater can be improved. Improvement, weight reduction, and long life can be achieved.

Claims (4)

[Claims] 1. An aluminum alloy clad material in which a sacrificial anode material is clad on one surface of a core material and an Al—Si brazing material is clad on the other surface, wherein the core material has a Mn of 0.1%.
6 to 2.0% (% by weight, hereinafter the same), Cu: 0.3 to
1.0%, Si: 0.06% or more and less than 0.5%, Fe:
The sacrificial anode material contains 0.01 to 0.4%, and the balance is made of an aluminum alloy including Al and unavoidable impurities. The sacrificial anode material includes Zn: 0.5 to 4.0% and In: 0.005 to 0.5.
1%, Sn: one of 0.01 to 0.1% or 2
Seeds, Si: 0.01-0.5%, F
e: 0.01 to 0.5%, the balance being composed of an aluminum alloy comprising Al and inevitable impurities, a matrix of a core material having a fiber structure, and a tensile strength of a cladding material of 170 to 260 MPa. A high-strength aluminum alloy clad material for heat exchangers having excellent pipe forming properties and corrosion resistance. 2. The core material further comprises Ti: 0.06 to 0.35.
2. The high-strength aluminum alloy clad material for heat exchangers according to claim 1, wherein the clad material has excellent pipe forming properties and corrosion resistance. 3. 3. The core material further comprises Mg: 0.06 to 0.4%.
The high-strength aluminum alloy clad material for heat exchangers according to claim 1 or 2, wherein the clad material is excellent in pipe formability and corrosion resistance. 4. The sacrifice anode material further comprises Mg: 0.5-2.
The high-strength aluminum alloy clad material for heat exchangers according to any one of claims 1 to 3, wherein the clad material has excellent pipe forming properties and corrosion resistance.