JPS6077949A - Corrosion resistant cu alloy having high strength and wear resistance - Google Patents

Abstract

PURPOSE:To obtain a Cu alloy consisting of prescribed percentages of Ni, Mn and Si and the balance Cu with inevitable impurities and having high strength and wear resistance as well as corrosion resistance. CONSTITUTION:This Cu alloy consists of, by weight, 3-15% Ni, 0.5-5% Mn, 0.3-2% Si and the balance Cu with inevitable impurities. An intermetallic compound consisting of Ni, Mn and Si is effectively precipitated in the Cu alloy in a dispersed state by adding said proper amounts of Mn and Si to Ni contained in relatively large quantities. The precipitation combined with the powerful reinforcement of a solid soln. with Ni and Mn provides superior strength, wear resistance and corrosion resistance to the Cu alloy. Since the Cu alloy can be prevented from being fouled with oceanic life such as seaweeds, it is applicable to a material for a wire net for a culture crawl, a pump for sea water, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a corrosion-resistant copper base metal, and is a copper base metal that has not only corrosion resistance but also strength and wear resistance. This is related to this.

It is known from previous nT1 that by adding elements such as tin, aluminum, nickel, mankan, oricon to copper-based metals such as brass, it is possible to improve the surface corrosion resistance9 strength and machinability of the alloy. Until now, special steel base metals with various compositions (e.g. cupronickel, silicon bronze, ASTM-C85500 alloy, p, ST
M-C85800 alloy, etc.) have been developed.

However, although all of these special copper base metals of 01H individually have excellent properties such as corrosion resistance, strength, and wear resistance, they do not have all three characteristics (11-). Currently, there is no copper-based alloy with such properties.For example, although cupronickel has excellent corrosion resistance, it has poor strength and wear resistance. However, the problem is that the strength and abrasion resistance are extremely low, and the corrosion resistance itself is also relatively low.

The present invention aims to solve the above-mentioned problems with conventional special steel base metals of this type. The purpose is to provide a base alloy.

Therefore, the inventors of the present application are wondering if all of the conventional corrosion-resistant copper-based alloys of this type are based on alloys of copper and zinc, with small amounts of aluminum, nickel, manganese, etc. Based on an alloy of nickel and nickel, mankan and silicon are added together to achieve strong solid solution strengthening of nickel and manganese and dispersion precipitation strengthening of intermetallic compounds of nickel, manganese and noricon, resulting in high strength and durability. The idea was to create a copper base metal with excellent wear and corrosion resistance.

The present invention was created based on the ideas described in +iiJ, and after repeated numerous tests with various component ratios of copper, nickel, manganese, and silicon, based on the test results, O1I solid solution reinforcement and metal We discovered the composition of each element that would most effectively exhibit the dispersion precipitation strengthening of intermediate compounds, and this made it possible to create a copper base metal that has three excellent properties: strength, wear resistance, and corrosion resistance. It is something.

The high-strength wear-resistant and corrosion-resistant copper base metal according to the present invention contains nickel in an amount of 3 to 15% by weight and manganese in an amount of 0.5 to 5% by weight.

The basic structure is that Noricon 03-2 weighs 96, and the remainder is copper and unavoidable impurities.

Hereinafter, the structure and effects of the high-strength, wear-resistant and corrosion-resistant copper base metal according to the present invention will be explained.

First, the present invention is based on a copper-nickel alloy, and the nickel is mainly used to obtain the corrosion resistance and strength unique to cupronickel. If the content of nickel is less than 3% by weight, desired corrosion resistance and improvement in strength and wear resistance due to the formation of intermetallic compounds with silicon and manganese cannot be obtained. Furthermore, if the nickel content exceeds 15% by weight, the strength and wear resistance will decrease.
2 is almost saturated, and even if the nickel content is increased further, it will not be possible to achieve a significant improvement in strength, and this will lead to increased costs. As a result, in the present invention, the nickel content is limited to 3 to 15% by weight.

Next, whether manganese is used to improve the strength and corrosion resistance of the copper base metal and to facilitate melting and casting, or if the manganese content is less than 0.5% by weight, nickel or silicon Improvements in strength and wear resistance cannot be obtained due to the formation of intermetallic compounds or solid solution. On the other hand, if the manganese content exceeds 5% by weight, the corrosion resistance will drop sharply, so in the present invention, the manganese content is defined in the range of 0.5 to 5% by weight.

Furthermore, silicon improves the strength and corrosion resistance of the copper base metal and facilitates melting and casting through its deoxidizing effect, but if its content is less than 0.3% by weight, nickel, The only improvement in strength and wear resistance is due to the formation of intermetallic compounds with manganese. Moreover, if the silicon content exceeds 296, the cold workability will be significantly reduced.

As a result, in the present invention, the silicon content is set to 0.3 to
2 weight is limited to 96.

In the present invention, nickel and manganese are used.

In addition to silicon as an essential component, aluminum can also be mentioned as a solid solution component in the matrix. That is, if the aluminum content is less than approximately 4% by weight and the aluminum content is less than 96%, the strength, Iψ wear resistance, and corrosion resistance of the copper-based alloy according to the present invention will not be impaired. but,
If the aluminum content exceeds 4.96% by weight, the cold workability will be extremely reduced, so the aluminum content must be less than 4.96% by weight.

Also iron, cobalt, norconium, and titanium.

Beryllium, chromium, and the like are effective constituent elements in forming a composite compound through interaction with the components constituting the intermetallic compound of the copper-based alloy according to the present invention and improving wear resistance. However, if the content exceeds 1% by weight, it is undesirable as it may cause the generation of pinholes during casting.
Is it necessary to reduce 11 to less than 1%?

Next, the test methods and results for the strength, wear resistance, and corrosion resistance of the alloy according to the present invention will be explained.

Table 1 shows the components of the sample alloy used in the test and the components of the conventional alloy, and Table 2 shows the test results.

Table 1 Chemical composition of sample alloy Table 2 Test results Test samples (161 to &5) according to the present invention and test samples of conventional alloys were prepared by placing raw materials having the components shown in Table 1 in the atmosphere. 5 ooyr each by high frequency melting
This was melted and cast into a mold with an inner diameter of 220 mm, and then formed into a round bar material with an outer diameter of 35 mm by hot extrusion and cold working.

The tensile test was performed by subjecting a portion of the round bar material to a normal tensile testing machine. In addition, the corrosion resistance test was carried out using an autoclave tester, and a part of the blank was heated at 150'C for 60 minutes.
%Nacj! The corrosion weight loss was measured after immersing the sample in a solution with an internal pressure of 41 ct)/aN for 5 days.

Furthermore, the wear resistance test was carried out by first cold forging a part of the round bar material, and then forming it with an inner diameter of 16 φ and an outer diameter of 32 mm as shown in Fig. 1.
Ring body 1 between φ and thickness 10 and inner diameter 16φ.

Outer diameter/18φ, thickness: Cutting into a ring body 2 with a diameter of 0,
Next, the two were placed facing each other and rotated in the direction of the arrow at a rotational speed of 20 ORPM under a load F of 50 kgr, and the wear reduction (m) per 106 rotations was measured.

Figures 2 to 6 are micrographs of the copper-based metal (sample 5) according to the present invention, and Figure 2 is a secondary electron image (3000
Figure 3 is a copper X-ray image (3000x), Figure 4 is a nickel X-ray image (3000x), and the 51st issue is Mankan-
X-ray image (3000x) and Figure 6 is a silicon-X-ray image (
3000 times). The secondary electron image in FIG. 2 is a 3000-fold magnification of the metal surface, and the white particles 3 in the microscopic photo are intermetallic compounds of nickel, manganese, and nickel (Ni2Si, Mo5S
i3, etc.), and these intermetallic compounds enhance the strength and wear resistance of the alloy according to the invention.

In addition, in the X-ray images shown in FIGS. 3 to 6, the more white spots Φ, the more that element is contained, and the remaining nickel, manganese, and silicon that formed the intermetallic compound are each dissolved in copper.

On the other hand, Figure 7 is a secondary electron image (3000x) of the sample surface of a conventional alloy (cupronickel (A)), and as is clear from the micrograph, there are no intermetallic compounds in the conventional alloy. Nickel, manganese, etc. are all dissolved in copper.

As is clear from the test results in Table 2 above, the copper-based alloy according to the present invention has superior strength, wear resistance, and
It can be seen that it is excellent in all aspects of corrosion resistance and has a well-balanced combination of each characteristic. That is, in the present invention, nickel is produced by containing a relatively large amount of nickel and adding appropriate amounts of manganese and norikono.

A metal compound between manganese and manganese is effectively dispersed and precipitated, and this, together with the strong solid solution reinforcement of nickel and manganese, gives the copper base metal excellent strength, wear resistance, and corrosion resistance. It is.

It goes without saying that the copper-based metal according to the present invention has properties equivalent to or better than conventional alloys in terms of workability.

As mentioned above, the copper base metal according to the present invention has high strength.

It has excellent corrosion resistance and IV abrasion resistance, and since it is a copper-based alloy, it can prevent the adhesion of high-level marine organisms. Motors, seawater valves, wheeler condensers,
It is an industrially extremely useful copper-based alloy that can be applied to equipment that handles seawater, such as heat exchangers, and can also be used as chemical-related equipment and spring materials.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the abrasion resistance test. FIG. 2 is a micrograph showing a secondary electron image of the metal surface of the copper base metal according to the present invention, FIG. Figure 5 is a micrograph showing a manganese-X-ray image.
FIG. 6 is a micrograph showing a Noricon-X-ray image. FIG. 7 is a micrograph showing a secondary electron image of the metal surface of a conventional alloy (cupronickel). 1.2 Ring body 3 for abrasion resistance test Intermetallic compound - Patent applicant: Sanpo Naka mlil I-Gyo Co., Ltd. Representative: Yuichi Kuno Procedure: Masaaki Tadashi (spontaneous) February 17, 1980 Patent Office Technical Officer 1 Display of small A 11 Patent application No. 185320/1982 2
Title of the invention: High-strength, abrasion- and corrosion-resistant copper mine (alloy 3) Relationship with the amended person's case: Special + rr Applicant address: 8-374 Sanbo-cho, Sakai-shi, Osaka Name: Sanbo Shindo Kogyo Co., Ltd. Representative: Kuno Wholesale Division 4 Agent 5 ili +1E's S・] Elephant Specification 1L1 "Detailed Description of the Invention" σ] Kozue (and "Brief Description of Drawings" Column 6 Contents of Amendment (1) Specification, page 4, line 20 “The strength of... and...
” to “wear resistance strength and...” 0 (
2) r 500gr j on page 8, line 19, r 5oo
Correct to 1+9j. (3) Correct "autoclave" in line 5 of page 9 to "autoclave". (4) On page 9, line 18, change “microscope (a-sharp photo)” to “electron microscope (8
& mirror photo”. (5) On page 10, line 4 and line 166, "micrograph" is corrected to "electron micrograph". (6) Page 12, line 5, line 6, line 7, item 8, 9
Correct the "micrograph" in lines 1 and 111 to "electron micrograph".

Claims (1)

[Claims] A high-strength wear-resistant and corrosion-resistant copper base metal consisting of nickel 3-15ffi'1%, manganese 0.5-5 96% by weight, /IJcon 0.3-2% and the balance copper and unavoidable impurities.