KR20160043674A - Copper alloy material for connectors with high strength, high thermal resistance and high corrosion resistance, and excellent bending processiblity, and method for producing same - Google Patents

Abstract

The present invention relates to a copper alloy material having high strength, high heat resistance, high corrosion resistance and good bending workability and a method for producing the same. More specifically, the composition of the copper alloy material according to the present invention is 100% by weight, and is composed of 5.0 to 40.0% by weight of Zn, 0.5 to 5.0% by weight of Fe, 0.5 to 2.0% by weight of Sn, 0.01 to 0.3% Copper, and trace amounts of inevitable impurities, and the copper alloy material has properties such as high tensile strength, elongation, electrical conductivity, and good bending workability. The copper alloy material may further include at least one element selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less.
A step of hot rolling the ingot by heating at 800 to 900 DEG C, a step of cold rolling, a step of annealing the ingot at 400 to 500 DEG C for 5 to 10 hours, Removing heat treatment, cold rolling, and annealing at 600 to 800 DEG C for 10 to 60 seconds.

Description

TECHNICAL FIELD [0001] The present invention relates to a copper alloy material for automobile connectors having high strength, high heat resistance, high corrosion resistance, and excellent bending workability and a method for manufacturing the same. BACKGROUND ART [0002] }

The present invention relates to a copper alloy material for automobile connectors excellent in strength, heat resistance, corrosion resistance and bending workability, and a method for manufacturing the same. More specifically, the copper alloy material of the present invention is improved in strength, heat resistance, corrosion resistance, and bending workability compared to brass and conventional connector materials, and at the same time, it is suitable for automobile electric wire harness materials and the like by mixing low-cost metals.

Brass (Cu-Zn type alloy) has good workability and low cost, and thus is widely used for wiring connection parts for automobiles, information communication appliances, and home appliances.

In recent years, as connecting parts such as connectors have been downsized, slender and thinner electrical and electronic parts have been demanded. Terminals applied to such parts are also required to have a narrow pitch and a large number of pins, Since the copper alloy material is also thinned due to an increase in the strength, the strength is required to be relatively high. However, since the content of zinc (Zn) having a low melting point is high in the brass material, it is not easy to improve the strength while maintaining workability.

Particularly, automotive connectors are used in harsh environments such as engine rooms, and require miniaturization and complicated shapes, so that they require not only high strength but also excellent bending workability and softening resistance and a high level of electrical conductivity higher than a certain level. For example, heat-generating terminal parts such as headlight sockets in automotive connectors are exposed to ordinary heat at about 80 to 120 ° C and repeatedly subjected to thermal stress. However, connectors made of conventional brass and phosphor bronze have low softening resistance, and when exposed to thermal stress for a long time, there may be a short circuit between signal and electric power due to poor contact between the connectors. Therefore, in the case of an expensive automobile, a high-performance copper alloy material is mainly used instead of brass and phosphor bronze for connectors. However, due to manufacturing cost problems, brass and phosphor bronze are applied to automobile connectors.

Japanese Unexamined Patent Publication No. 2006-188722 (Prior Art 1) discloses a hot rolled steel sheet which comprises 20 to 37% by weight of Zn and a total of 1% by weight or less of elements excluding Cu and Zn and is characterized by hot rolling, intermediate cold rolling, Discloses a brass material having a tensile strength of 500 N / mm < ² > or more and exhibiting good characteristics at 180 deg. Bending workability by a process comprising the steps of: In the above-mentioned prior art 1, the material is processed to a required thickness through the above-described process to obtain a product. However, since the copper alloy material manufactured according to the above-mentioned prior art 1 is composed of only Cu and Zn, it is desired to secure the bending workability and strength by making use of the manufacturing characteristics. However, And the heat resistance and corrosion resistance characteristics are not mentioned.

Japanese Unexamined Patent Publication No. 2000-129376 (Prior Art 2) discloses a two-phase mixed-phase brass made of fine? -Phase and? -Phase. However, in general, the brass used for a terminal is a single-phase brass, and when the single-phase brass is increased in the composition of the copper alloy by increasing the content of the copper to increase the? -Phase to replace the? +? -Phase type brass, . In the specification of the prior art 2, only the evaluation of the bending workability is described as 90 °. However, in spite of the fact that the evaluation of the bending workability at 180 ° is inevitable for the terminals of the terminal type, Have not been disclosed.

The present invention The tensile strength, 10 to the vehicle connector, and an electronic apparatus parts, etc. in order to provide a copper alloy having a high strength, high heat resistance, high corrosion resistance and a good bending workability is used, the material characteristics required 560 ~ 650N / mm ² for Copper alloy materials for terminals having a bending workability satisfying both the electrical conductivity of 25% IACS, the elongation of 7 to 15%, the softening resistance of 400 ° C. or more, and the corrosion resistance against high temperature, high humidity and corrosive environment and suitable for terminal processing Method.

The copper alloy material for an automotive connector according to the present invention contains 100 wt% of Zn, 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, Cu of the remaining amount, And has high strength, high heat resistance, high corrosion resistance and bending workability. The copper alloy material may further include at least one element selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less. The copper alloy material is a tensile strength of 560 ~ 650N / mm ^2, the electrical conductivity is 10 ~ 25% IACS, an elongation of 7 to 15%, is within the softening temperature of more than 400 ℃, below the depth of corrosion in the corrosion resistance test 0.1mm, bendability At 90 [deg.] And 180 [deg.], Respectively.

The method for manufacturing a copper alloy material for an automotive connector according to the present invention is characterized in that it comprises 100% by weight of Zn, 5.0 to 40.0% by weight of Fe, 0.5 to 5.0% by weight of Fe, 0.5 to 2.0% by weight of Sn, 0.01 to 0.3% Obtaining an ingot from the molten metal; heating the ingot to a temperature of 850 to 950 占 폚 to perform hot rolling; cold rolling; heating the ingot at a temperature of 400 to 500 占 폚 to 5 to 10 Time stress relieving heat treatment, cold rolling and annealing at 600 to 800 占 폚 for 10 to 60 seconds. In the above production method, the molten metal may further contain at least one element selected from the group consisting of Si, P, Al, Mg and Ca in an amount of 1 wt% or less. Further, the cold-rolling and annealing treatment at 600 to 800 ° C for 10 to 60 seconds may be repeatedly performed to produce the finally-produced copper alloy material to a desired thickness. Wherein the copper alloy material has a tensile strength of 560 to 650 N / mm ² , an electrical conductivity of 10 to 25% IACS, an elongation of 7 to 15%, a softening temperature of 400 ° C or more, a corrosion depth of not more than 0.1 mm , And is defective at 90 ° and 180 ° in bending workability.

The present invention relates to a copper alloy material having a high strength of 560 to 650 N / mm ² , an electrical conductivity of 10 to 25% IACS, an elongation of 7 to 15%, a softening resistance of 400 ° C. or more, a high corrosion resistance and excellent bending workability, .

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an optical microscope photograph showing the results of bending workability test at 90 ° and 180 ° conditions of copper alloy re-samples respectively prepared according to Example 1, Comparative Examples 11 and 12;
FIG. 2 is a graph showing the resistance test results of the copper alloy specimens prepared according to Example 1 and Comparative Examples 11 and 12, respectively.
FIG. 3 is an optical microscope photograph showing deoxynitic corrosion test results of the copper alloy samples prepared according to Example 1 and Comparative Examples 11 and 12, respectively. FIG.

The present invention relates to a copper alloy material having high strength, high heat resistance, high corrosion resistance and excellent bending workability suitable for automobile connectors and a method for manufacturing the same.

The copper alloy material having high strength, high heat resistance, high corrosion resistance and excellent bending workability according to the present invention is characterized by comprising 100 wt% of Zn, 5.0 to 40.0 wt% of Fe, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni %, And the remaining amount of Cu and trace amounts of unavoidable impurities.

In the copper alloy material, Zn contributes to improvement of the heat peelability, casting, bending workability and corrosion resistance of the plating, and is included in the range of 5.0 to 40.0 wt%. If the content of Zn is less than 5% by weight in the copper alloy material according to the present invention, there is no effect of improving the heat peelability of the degassing and plating in the melting and casting step. If the content of Zn exceeds 40% by weight, Which adversely affects casting, bending workability and corrosion resistance.

In the copper alloy material, Fe contributes to improvement of strength and softening resistance by work hardening in the present invention, and is included in the range of 0.5 to 5.0 wt%. When Fe is less than 0.5% by weight, sufficient strength can not be obtained. When Fe is more than 5.0% by weight, the electrical conductivity drastically decreases and the casting is adversely affected.

In the copper alloy material, Sn contributes to improvement in corrosion resistance and shows an effect of preventing dezinc corrosion due to formation of a passive film upon contact with a corrosion medium, and is included in the range of 0.5 to 2.0 wt%. When Sn is contained in an amount less than 0.5% by weight, the corrosion resistance is not improved, and when it is contained in an amount exceeding 2.0% by weight, cracking may occur in hot working.

In the copper alloy material, the addition of a trace amount of Ni broadens the solubility of Fe and maximizes the work hardening effect, and may be included in the range of 0.01 to 0.3 wt%. When the content of Ni is less than 0.01% by weight, the effect of improving tensile strength can not be sufficiently obtained. When the content of Ni exceeds 0.3% by weight, tensile strength is improved.

In the present invention, unavoidable impurities are elements added in the manufacturing process and added in a very small amount, so that the characteristics of the final copper alloy material obtained are not affected.

The copper alloy material according to the present invention may further contain at least one element selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1% by weight or less. At least one element selected from the group consisting of Si, P, Al, Mg and Ca is added to the molten metal to prevent deformation of the molten metal during ingot casting, The casting can be improved.

The copper alloy material according to the present invention preferably has a tensile strength of 560 to 650 N / mm ² , an electrical conductivity of 10 to 25% IACS, an elongation of 7 to 15%, a softening temperature of 400 ° C or more, The bending workability exhibits defect-free properties at 90 ° and 180 °.

The tensile strength is the mechanical property of the material related to the bondability between the female terminal and the male terminal after the terminal is formed and the formability at the time of working the material using the metal mold. If the tensile strength of the copper alloy material is too strong, And the damage and wear of the mold become severe. On the other hand, if the tensile strength is too low, defects such as warping will occur when joining the terminals, so that a tensile strength of 560 to 650 N / mm ² is required.

Electrical conductivity is a fundamental property to be provided as a connector material, and the terminal serves as a current path for current flow. If the electrical conductivity is too low, heat will be generated as the electrical resistance increases, thereby causing deformation of the bonded terminals. Therefore, the copper alloy material for automotive connectors should have an electrical conductivity of at least 10% IACS, preferably 10 to 25% IACS.

The elongation is a characteristic of a material which is related to the tensile strength and bending workability of the material. If the elongation is small, the tensile strength is increased and the bending workability is lowered. On the other hand, if the elongation is large, the tensile strength is lowered and the bending workability tends to be good . Therefore, an elongation of 7% or more, preferably an elongation of 7 to 15% is required in order to ensure good terminal forming properties along with the required tensile strength through appropriate processing design.

The bending workability is the most basic characteristic in manufacturing the connector, and it is processed into a profile shape after punching using a mold, and the final shape is processed. When the bending workability of the material is poor, cracks are generated on the surface of the bending portion, and the portion is subjected to external stress, thereby losing the electrical reliability due to weak bonding strength. As the size of the terminal progresses, the thickness of the copper alloy sheet material becomes thinner, and the bending workability is further demanded. Therefore, for use in automotive connectors, the copper alloy material should exhibit defect freeness at 90 ° and 180 ° bending workability. As used herein, the term " defect free "means that only good to small wrinkles occur, as in the embodiments described below.

The bending workability of the copper alloy material according to the present invention is very excellent, so that it can be applied to a miniaturization of connectors and connector parts of complex shapes.

On the other hand, it can be seen that the tensile strength of the copper alloy material manufactured according to the above-mentioned prior art 1 (Japanese Patent Laid-open No. 2006-188722) is inferior to that of the copper alloy material according to the present invention, and data on elongation and electrical conductivity are not described I did.

Further, it can be seen that the electrical conductivity of the copper alloy material manufactured according to the above-mentioned prior art 2 (Japanese Patent Laid-Open No. 2000-129736) is inferior to that of the copper alloy material according to the present invention, and its softening resistance, bending workability, Data on corrosion and so on are not provided. In this connection, since the copper alloy is made of only copper and zinc in the prior art 2, those skilled in the art can easily predict from the characteristics of the existing brass that the flame retardancy, the bending workability and the zinc corrosion resistance are poor.

On the other hand, the copper alloy material according to the present invention simultaneously satisfies the strength and the bending workability, which are suitable for automobile connectors. In order to improve the strength of conventional brass, the plate material is processed by rolling to reduce the bending workability. That is, the conventional brass can not satisfy both the strength and the bending workability at the same time, and thus it is difficult to apply the present invention to automobile connectors. In addition, some alloys have a poor hot workability, such as hot rolling, and therefore, it is difficult to manufacture plate shapes and they must be manufactured as castings. However, the copper alloy material according to the present invention can be used for an automobile connector because it has strength after securing bending workability, and can be manufactured by a sheet material by a rolling process.

Regarding softening resistance, since automobile connectors are repeatedly used at an ambient temperature of 100 to 120 캜, softening may occur due to repeated thermal stress. Since conventional brass and phosphor bronze alloys have an internal softening temperature of 300 to 350 DEG C, softening often occurs due to the above-mentioned repeated thermal stress. On the other hand, the copper alloy material according to the present invention is excellent in resistance to softening and has a softening temperature of 400 DEG C or higher, so that a more stable signal and current can be transmitted.

In addition, the copper alloy material according to the present invention is more preferable because it can have a high performance even though it is an alloy produced at a low raw material price.

In addition, with respect to the dezincification characteristic, the existing zinc brass dezincification phenomenon weakens the strength of the contact portion, which may cause a momentary short-circuit of the connector contact portion due to vibration in the automobile and may be connected to the fire. Therefore, The corrosion must be controlled to 0.1 mm or less. In the case of the copper alloy material according to the present invention, since dezincification does not occur, the surface of the material can be maintained even in a corrosive environment when manufactured into an automotive connector, thereby assuring the reliability of the electrical contact portion.

A method for manufacturing a copper alloy material according to the present invention

On the other hand, a method for manufacturing a copper alloy material for automobile connectors having high strength, high heat resistance, high corrosion resistance, and excellent bending workability according to the present invention will be described below.

The method for manufacturing a copper alloy material for an automotive connector according to the present invention will be described in more detail. A molten metal is melted by using a melting furnace such as a high frequency, a mid-frequency or a low frequency, Rolling the ingot by heating to 850 to 950 占 폚, cold-rolling, stress-relieving heat treatment at 400 to 500 占 폚 for 5 to 10 hours, cold-rolling the ingot, To 800 < 0 > C for 10 to 60 seconds.

The present invention relates to a copper alloy material having a desired finish rolling thickness and high strength, high heat resistance, corrosion resistance and excellent bending workability by repeating the cold rolling step and the annealing treatment step at 600 to 800 ° C for 10 to 60 seconds in a strip form .

The copper alloy of the present invention having high strength, high heat resistance, corrosion resistance and excellent bending workability can be manufactured without any problem within the range of using an ingot heating furnace or a hot rolling mill of a Shindong factory having ordinary modern facilities.

After completion of the hot rolling from the start of the hot rolling to the last pass for about 10 minutes, the hot rolling bath is cooled in a coil shape. Following the water cooling, the steel sheet is cold-rolled to a predetermined thickness and then heat-treated.

In the batch type stress relieving annealing furnace during the stress relieving annealing treatment, the annealing is preferably performed at 400 to 500 ° C for 1 to 10 hours. Stress removal is insufficient at a temperature range lower than the above range and / or short processing time, and economical efficiency is low at high temperature range and / or too long processing time.

The cold rolling step and annealing treatment at 600 to 800 ° C for 10 to 60 seconds may be repeatedly performed depending on the thickness of the copper alloy material to be finally achieved.

The method of manufacturing the copper alloy material according to the present invention is not limited to the above-mentioned contents. The method of manufacturing the copper alloy material according to the present invention is not limited to the above-described contents. For example, cold rolling, stress removal heat treatment, surface cleaning Pickling annealing), tensile annealing, tension leveling, and the like may be selected and combined in accordance with need.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto.

Example

Manufacturing example : Example  1 to 10 and Comparative Example  11 to 18

An alloy having the composition shown in Table 1 was melted in a high-frequency melting furnace, and an ingot having a thickness of 200 mm, a width of 600 mm and a length of 7000 mm was cast using a semi-continuous casting apparatus while the molten metal was coated with charcoal or argon gas to prevent oxidation.

After cutting the unstable portions of the top and bottom of the ingot, the ingot was heated and hot rolling was performed by setting the hot rolling start temperature at 870 캜.

After completion of the hot rolling, hot-rolling by spraying was quickly performed in a hot rolling bath having a thickness of 12 mm, cooled to room temperature, and then wound in a coil shape. Thereafter, the surface was ground with 1 mm on both sides to remove the scale. Then, cold-rolling and 450 DEG C x 450min stress-relieving heat treatment were carried out so that the thickness of the copper alloy material became 1.5 mm, and cold rolling and annealing at 780 DEG C x 24 sec were carried out again so that the obtained copper alloy material had a thickness of 0.5 mm. Cold rolling and annealing at 780 占 폚 占 12 sec were repeated so that the thickness of the copper alloy material was 0.26 mm, and the resulting copper alloy material was cold-rolled so that the thickness of the finally obtained copper alloy material became 0.2 mm. Finally, a rolling bath was obtained.

In addition, pickling polishing was performed for the surface cleaning after the optional stress relieving heat treatment, and after the second heat treatment, the tension leveler was calibrated.

division Sample number Component (% by weight) Cu Zn Fe Sn Ni Si Mg Al Example
(Invention) One Honey. 12.5 1.2 1.5 0.05 - - 2 Honey. 25 1.5 0.5 0.05 - - 3 Honey. 25 3.0 1.0 0.05 - - 4 Honey. 39 1.5 1.5 0.05 - - 5 Honey. 35 3.0 1.5 0.05 - - 6 Honey. 25 1.5 1.2 0.05 - - 7 Honey. 35 1.5 2.0 0.05 - - 8 Honey. 12.5 1.2 1.5 0.05 0.9 - - 9 Honey. 39 1.2 1.5 0.05 - 0.9 - 10 Honey. 25 1.2 1.5 0.05 - - 0.9 Comparative Example 11
(AD442) Honey. 25.3 0.8 - - - - - 12
(C2600) Honey. 29.9 - - - - - - 13
(JP 2006-188722) Honey. 30 - - - - - - 14
(JP 2000-129376) Honey. 37.3 - - - - - - 15 Honey. 25 0.3 1.2 0.05 - - - 16 Honey. 25 5.5 1.2 0.05 - - - 17 Honey. 25 1.5 0.3 0.05 - - - 18 Honey. 25 1.5 1.2 0.5 - - -

* AD442: product of DOWA (use: connector other)

* C2600: Cu-30Zn product (general purpose)

Test Example  1: Characteristic test

The tensile strength (TS), elongation (El), Vickers hardness (Hv), electrical conductivity (EC) and bending workability of the test pieces obtained by the above composition and the production method were examined.

Tensile strength and elongation were measured according to KS B0802, Vickers hardness (Hv, 5 kg) was measured according to KS B0811, and electrical conductivity related to heat and electricity conductivity was measured according to KS D0240.

The bending workability was measured in accordance with KSB 0804 (metal material bending test method).

The test results are shown in Table 2.

division sample
number TS
(N / mm ² ) Hand
(%) Vickers hardness
(Hv, 5 kg) EC
(% IACS) Dezinc corrosion
(mm) Bending workability GW BW 90 ° 180 ° 90 ° 180 ° Example
(Invention) One 586 12 182 19 0.0 A A A A 2 610 10 209 17 0.0 A A A A 3 590 11 185 16 0.0 A A A A 4 640 10 228 17 0.0 A A B B 5 630 7 218 11 0.0 A B A B 6 611 11 207 13 0.0 A A A A 7 634 7 224 13 0.0 B A A A 8 588 11 185 18 0.0 A A A A 9 642 9 229 16 0.0 A B B B 10 601 9 211 15 0.0 A B A B Comparative Example 11
(AD442) 640 5 200 25 0.3 C B C C 12
(C2600) 525 13 175 27 1.2 A B B B 13
(JP 2006-188722) 520 13 110 27 1.2 A A A B 14
(JP 2000-129376) 535 26 118 26 0.8 A A A B 15 575 12 175 15 0.1 A A A A 16 638 6 226 9 0.0 B C B C 17 590 11 186 14 0.7 A A A A 18 632 8 223 9 0.0 B B B B

On the other hand, in Table 2, the copper alloy material produced according to the above-described Examples and Comparative Examples was cut into test pieces each having a width of 30 mm and a length of 10 mm at the center corresponding to both the width and the longitudinal direction of the rolling tank, (R / t = 0) and 180 (R / t = 0) in the rolling direction (Good Way, GW) and in the direction perpendicular to the rolling direction (Bad Way, BW), respectively, according to KSB 0804 t = 1), and then surface defects on the bent surface were observed with an optical microscope and evaluated. B, C, and D were observed visually or microscopically for the presence or absence of breakage outside the bent portion and other defects. Defective means A and B in the following evaluation classes.

≪ Evaluation grade of bending workability >

A: Good,

B: Small Wrinkle,

C: Large Wrinkle,

D: Crack

Sample 1 of the present invention shows the results obtained for Samples 11 and 12 of Comparative Examples 11 and 12 at 90 ° and 180 ° in FIG. As can be seen from FIG. 1, Sample 1 of the present invention showed excellent bending workability at 90 ° and 180 ° compared to Samples 11 and 12 of Comparative Examples 11 and 12.

Test Example  2: Fire resistance  exam

The softening resistance test was carried out in the same manner as in the above-mentioned bending workability test except that the copper alloy material produced according to the above-mentioned Examples and Comparative Examples was subjected to a test piece having a width of 30 mm and a length of 10 mm Each was cut and a test piece was prepared. The hardness of the specimens was measured at room temperature (25 ° C), and the hardness of each specimen was measured during heating for 15 minutes at intervals of 100 ° C to 50 ° C to observe the temperature at which the rolling mill began to soften. The results are shown in Fig. 2 shows the temperature on the X axis and the hardness on the Y axis, and the graph shows the result of measuring the hardness after cooling for 15 minutes at the corresponding temperature. Specifically, according to the graph shown in FIG. 2, Sample 1 (softening start temperature: about 400 DEG C) of Example 1 according to the present invention is composed of Samples 11 and 12 (softening start temperature: 300 < 0 > C and 350 < 0 > C respectively). The softening temperature of the sample 1 prepared according to Example 1 and the softening temperature of each of the samples 11 and 12 prepared according to Comparative Examples 11 and 12 differ greatly by about 50 to 100 ° C. Due to such a difference, when the sample according to the embodiment is applied to an automotive connector, it can be used more stably than conventional brass and phosphor bronze because it has excellent resistance to softening even when repeated thermal stress is applied. When samples 11 and 12 are used in actual connectors, since the softening temperatures are respectively 300 占 폚 and 350 占 폚, signal shorting due to softening at the connector contact portions may occur.

Test Example  3: Dezinc corrosion  exam

Each of the test pieces was prepared and used in the same manner as in the method of preparing the test piece in the softening test of Test Example 1 according to the ISO-6509 test method. The test specimens were immersed in a 1.0% m / m aqueous solution of copper chloride mixed with distilled water and copper chloride (CuCl ₂ ) for 24 hours. The sections were then cut and evaluated by measuring the depth of corrosion by optical microscopy. The results obtained are shown in Fig. As can be seen from FIG. 3, Sample 1 of Example 1 showed no dezinc corrosion (0 mm) and was superior in dezinc corrosion resistance to Samples 11 and 12 of Comparative Examples 11 and 12.

Zinc de-zinc phenomenon of brass weakens the strength of the contact part, which may cause a momentary shorting of the connector contact due to vibration in the case of automobiles and may be connected to the fire. The copper alloy produced according to the present invention does not cause dezincification even when exposed to the corrosive environment, so that the surface of the material can be maintained even in the corrosive environment during manufacture of the connector, thereby assuring the reliability of the electrical contact.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, by adding Fe, Sn, and Ni elements to a Cu-Zn alloy in a specific range, it is possible to provide an automobile connector capable of satisfying both high strength, high heat resistance, high corrosion resistance and bending workability An automotive connector material or the like which can be used in a severe use environment can be manufactured.

Claims (7)

Characterized in that it is composed of 5.0 to 40.0% by weight of Zn, 0.5 to 5.0% by weight of Fe, 0.5 to 2.0% by weight of Sn, 0.01 to 0.3% by weight of Ni, the balance Cu and unavoidable impurities, A copper alloy material for automobile connectors having high heat resistance, high corrosion resistance and bending workability. The method according to claim 1,
And further contains at least one element selected from the group consisting of Si, P, Al, Mg and Ca in an amount of not more than 1% by weight. The method according to claim 1,
A tensile strength of 560 to 650 N / mm ² , an electrical conductivity of 10 to 25% IACS, an elongation of 7 to 15%, a softening temperature of 400 ° C or more, a corrosion depth of 0.1 mm or less in corrosion resistance test, And a defect-free at 180 DEG. Obtaining a molten metal composed of 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, and a balance of Cu and unavoidable impurities, as 100 wt% A hot rolling step of heating the ingot at a temperature of 850 to 950 ° C., a cold rolling step, a stress relieving heat treatment at 400 to 500 ° C. for 5 to 10 hours, a cold rolling step, Deg.] C for 10 to 60 seconds, so as to have a high strength, a high heat resistance, a high corrosion resistance and an excellent bending workability. 5. The method of claim 4,
Wherein the molten metal further comprises at least one element selected from the group consisting of Si, P, Al, Mg and Ca in an amount of 1 wt% or less. 5. The method of claim 4,
Rolling and annealing at 600 to 800 ° C for 10 to 60 seconds to obtain a final thickness of the copper alloy material to a desired thickness. 5. The method of claim 4,
A tensile strength of 560 to 650 N / mm ² , an electrical conductivity of 10 to 25% IACS, an elongation of 7 to 15%, an internal softening temperature of 400 ° C or more, a corrosion depth of not more than 0.1 mm in the corrosion resistance test, And a defect free at 180 DEG.

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