JPS60194033A - Copper alloy for radiator plate - Google Patents

Abstract

PURPOSE:To provide a copper alloy for a radiator plate having excellent strength, yield strength and resistance to stress corrosion cracking by adding a specific amt. of Zn, P or further Sn to Cu. CONSTITUTION:Soldering is not possible for fixing of a radiator plate 7 to a radiator tank 6 and said plate is fixed thereto by caulking if a resin is used as the tank 6 in place of brass in the prior art. A Cu alloy which has excellent bendability, caulkability (yield strength), strength and press formability, is free from stress corrosion cracking in the folded part and has excellent solderability with a radiator tube 8 is therefore required for the plate 7. A Cu alloy contg. 10-42wt% Zn, 0.005-0.1wt% P or further 0.05-1.0wt% Sn and having <=15mu crystal grain size is used for the above-mentioned purpose.

Description

[Detailed description of the invention] The present invention is for use in radiator plates.

Excellent stress corrosion cracking resistance 9 strength, especially for radiator plates for joining with resin tanks.

It is a lead alloy that has good moldability and adhesion to resin.

The radiator plate fixes the radiator tube and is also fixed to the radiator tank. Soldering is used as a fixing method for these, which improves strength and moldability.

Soldering requires precision (Figure 1). On the other hand, in recent years, the use of resin for radiator tanks has progressed from the viewpoint of corrosion resistance, and as it has become impossible to solder the 2 radiator plates and the radiator tank, a caulking method has been adopted (Second Edition). figure). Therefore, the following characteristics are required of the radiator plate material, since the radiator plate material is required to undergo processing such as bending, bending, and caulking that are different from those of conventional radiator plates.

(υ Good bendability.

(2) Good caulking. Namely.

High resistance.

(3) Stress corrosion cracking shall not occur at the bent portion.

(4) High strength.

(5) Good press moldability.

(6) Good soldering properties. (Adhesion to radiator tube) Despite these various required characteristics, the brass traditionally used is prone to stress corrosion cracking.

In addition, a straight material with good bendability and press moldability has a low yield strength, and has the disadvantage that good caulking cannot be obtained.

In view of these points, the present invention aims to improve the drawbacks of conventional brass and provide an excellent copper alloy for use in radiator plates.

The present invention uses Zn10-42 weight s, Pα005-0.1
A steel alloy for a radiator plate containing a weight of 1.5% and a balance of O and unavoidable impurities, and a Zn1O~42 weight 1. Pa0O5~α1 weight 4. SnQ, 05-1.
A copper alloy for a radiator plate containing 0% by weight and the balance consisting of O and unavoidable impurities, and a copper alloy for a radiator plate in which the crystal grain size of these alloys is 15 μm or less.

Next, the limitations and theorems of the alloy components constituting the alloy of the present invention will be explained. The reason why the Zn content is set to 10 to 42 wt-4 is that if the Zn content is less than 10 wt-4, the strength will be low.9.
It also has the disadvantage of being expensive. On the other hand, if the Zn content exceeds 42% by weight, the amount of β phase will increase and the processability will deteriorate.

The reason why the P content is set to αOOS~a1wt- is that if the P content is less than 1005wt, it is not effective in improving stress corrosion cracking resistance and yield strength; This is because if it exceeds this, the workability during material production will decrease.

The reason why the 8n content is set to α05~1.0wt.

The addition of 8n further improves stress corrosion cracking resistance and yield strength, but the content is lower than cL05 weight -
This is because if it is less than 1.0 weight, the effect will be weak, and if it exceeds 1.0 weight, the effect will be saturated.

Furthermore, the reason why the grain size is limited to 15p or less is that if the grain size exceeds 15μ, stress corrosion cracking susceptibility increases, so it is preferable that the grain size is 15μ or less.

The alloy of the present invention will be explained below using examples.

Examples After melting ingots of various compositions of the alloy of the present invention shown in Table 1 in a high frequency melting furnace.

It was hot rolled at 800°C to form a plate with a thickness of 8 mm.

Next, this plate was subjected to ordinary pickling treatment, and then cold rolled to a thickness of 2.
．． It was set to 0 mg. After further annealing at 500° C. for 1 hour, it was cold rolled into a plate having a thickness of L8 mm. This cold-rolled material was annealed at various temperatures for 1 hour and used as samples.

In addition, intermediate thickness products are produced by cold rolling, adjusted to various grain sizes by annealing, and then skin bathed to a thickness of α8.
A plate of ms was also used as a sample. As an evaluation of the sample prepared in this way, the strength, yield strength, grain size, and stress corrosion test of the material were shown.

For the stress corrosion cracking test, a 17-day cylindrical flat-bottomed punch with a 31-day conical cup test tool was used, and the drawing ratio was 2.
Make a cup of 0 and add this to hydroxyl +b II fp p
-J-Yuuryucho Somineji was exposed to an ammonia atmosphere of η10 and the time until cracking started was measured. These results are shown in Table #119 along with comparative alloys.

As shown in Table 1, the alloy according to the present invention exhibits higher strength and yield strength than conventional brass, and is also superior in stress corrosion cracking resistance. In addition, it has good press workability when processed into actual plates, making it the most suitable copper alloy for radiator plates.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional method of joining a brass tank and a radiator plate, and FIG. 2 is a sectional view showing a method of joining a resin tank and a radiator plate. 1. Brass tank 2 Radiator plate 5 Soldering is done Radiator tube & radiator fin & resin tank Z Radiator plate a Radiator tube radiator fin 1α Sealing material patent applicant Nippon Mining Co., Ltd. Agent Patent attorney (7569) Namikawa Keishi

Claims (3)

[Claims] (1) Zn 10~42% by weight, PO,005~
A copper alloy for radiator plates containing 0.1% by weight and the remainder consisting of O and inevitable impurities. (2) Zn10-42% by weight, PQ, 005-
(L11% by weight Copper alloy for radiator plates containing 0.05 to 1.0% by weight Sn, with the remainder consisting of O and inevitable impurities. (3) The copper alloy for radiator plates according to claims (1) and (2), characterized in that the crystal grain size is 15μ or less.