JPH07316690A - Hard copper alloy having resistance to corrosion, acid and heat - Google Patents

Abstract

PURPOSE:To produce a hard copper alloy excellent in flowability of molten metal and casting surface and having resistance to corrosion, acid(and heat by preparing a copper alloy with a specific composition which is composed essentially of Cu and in which respective contents of Ge, Ti, Mn and V are specified. CONSTITUTION:A hard copper alloy, which has a composition containing, by weight, about 20%, in total, of 0.60-4.0% V, 0.60-4.0% Ti, 0.60-4.0% Zr, 2.60-4.50% Mn, 0.60-4.0% Ge, 2.60-9.0% Al and 0.60-4.50% Te as essential components, also containing, selectively, about 5%, in total, of one or >=2 kinds among 0.0-4.50% Ta, 0.0-4.50% Nb, 0.0-4.0% Y, 0.0-4.50% Hf, 2.60-4.0% Co and 0.0-4.0% Be, and having the balance Cu with inevitable impurities, is prepared. By this method, the copper alloy improved in mechanical properties can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is V: 0.60-4.0 wt%, Ti: 0.60.
-4.0 wt%, Zr: 0.6-4.0 wt%, Mn:
2.60-4.50 wt%, Ge: 0.60-4.0w
t%, Al: 2.60-9.0 wt%, Te: 0.60
-4.50 wt% as an essential component, total 20 wt%
Ta and Nab :, Y :, H
f :, Co :, Be: one kind or a combination of two or more kinds and 5
It relates to a corrosion-resistant, acid-resistant and heat-resistant hard copper alloy that has a good molten metal flow and a good casting surface, which is made by mixing wt% with the essential components and mixing the balance with Cu: and the balance Cu :. To obtain a copper alloy that is more resistant to corrosion and acid than conventional copper alloy materials and has a significantly high hardness, and that its heat treatment makes it even more excellent in acid resistance and mechanical properties. In the present invention, the function and effect of various metal elements to be distributed in the alloy of the present invention will not be explained.Since the general alloy corrosion phenomenon is a different phase chemical reaction, it is related to the size of the surface area of the alloy. , The surface becomes rough and the surface area gradually increases. The cause of this is due to localized corrosion due to the inclusion of inferior elements, and the uniform solubility of the material is more important theoretically and practically than the absolute amount of corrosion loss for the corrosion protection of the alloy material. Therefore, the alloy of the present invention is Cu:
The main material is Ge, which has a smaller initial dissolution rate in terms of electrochemistry, and is added with a small amount of Mn: which gives particularly corrosion resistance to general corrosion resistant Ti: and Cu: alloys. , V which is particularly required for special valves, condensate pipes, etc .: Hardness due to addition and uniformity of material Addition of solubility is an important factor theoretically and practically. Therefore, the alloy of the present invention is mainly composed of Cu: and is provided with V: which has a smaller initial dissolution rate electrochemically, and imparts particularly corrosion resistance to Ti: and Cu: alloys having general corrosion resistance. A certain amount of Mn: is added, and V: + Zr: + Te: is provided to add hardness and uniformity of material required for special valve condensate pipes, etc. The excellent corrosion resistance is exhibited by arranging Al: which is the most oxidizable property in the place to be coated with the oxide of. Next, 3 pieces of the alloy of the present invention and 3 pieces manufactured by three excellent companies on the market were suspended in half in 3 wt% saline solution (half of one piece was crushed to the water surface and the corrosion generated on the water surface was examined). I tried. (Sample condensate pipe) As shown in Table 1.

Then, the alloy of the present invention, each company's product, and the condensate pipe were cut into round slices and divided into halves to form flat planes, which were each placed in an Erlenmeyer flask and placed in a 30 wt% H ₂ SO ₄ solution for boiling to perform a corrosion test. . The results are shown in Table 2. Show this as a tendency in the first drawing.

FIG. 2 was obtained for the relationship between the specific gravity of the alloys and the Brinell hardness (H _B ) depending on the chemical composition and the combination of the copper alloys of the invention patent application. It is thought that casting stress will remain in the casting when casting special valves etc. 55
The temperature in the furnace is kept for 1 hour at 0 ° C. to 650 ° C., and the extension time is limited to 3 hours depending on the size of the shape.
By tempering, or tempering, the sample is
As an effect that it is possible to enhance the 4% ~15% _{H B} and vehicle pressure. That is, the present alloy hardness is possible to obtain an alloy having a Brinell (H _B) -300 depending on the heat treatment.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

[Fig.1] Four pieces of the alloy of the present invention and a commercially available alloy are used as samples to immerse them in boiling 30 wt% H ₂ SO ₄ liquid and the effect of corrosion resistance of each sample for 500 hs is shown in a curve. It is called the sulfuric acid corrosion resistance test comparison curve.

FIG. 2 is obtained by casting each combination 9-type alloy of the present invention,
The specific gravity and H _B (Brinell hardness) of each alloy are shown in a curve (refer to Table 3), and the advantage of this (Fig. 2) is H _B 100. When obtaining the desired alloy within the range of ~ 300 and specific gravity of 8.00 to 7.10, see [Fig. 2] and obtain the target at a low cost.

Claims (1)

[Claims] 1.