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Yamato Gokin Co.Ltd.
Specialists in copper alloys, we will deliver it from Japan.

Development of "NC Alloys"

Using Corson alloys as the base, we have made many improvements to realize extremely high mechanical strength and excellent heat resistance (even better than having high contents of beryllium copper) without including any beryllium.
【Outline】
A new material based on Corson alloys, NC alloys have been developed as a replacement for beryllium copper. They do not contain beryllium, one of the Class 1 specified chemical substances.
Moreover, the strength of precipitation is reinforced by adding Cr and Sn. Therefore, NC alloys are strongly resistant to heat while also possessing excellent mechanical and physical properties.
←Click to enlarge.
 

NC Alloys' Characteristics

NC25 is especially hard with excellent tension strength while NC50 is especially superior in terms of electrical conductivity and heat conductivity.

Although both can be used for die-cast machine plunger chips, NC50 is the one that is most suitable.

Using NC50's plunger chips allows the following outstanding characteristics.
・Longer life through excellent abrasion resistance
・Economical use of lubricants and improved die-cast product quality
・Improved high-temperature performance
・Shorter waiting time and improved productivity (shorter cycle time)
 

NC25

[Features]
NC25 has the second highest strength following the case with high contents of beryllium copper while performing better than beryllium copper 25 alloys in terms of heat resistance.
[Main Applications]
Electrodes for resistance welding, welding machine parts (arms, holders, jigs), and plastic die materials.
 

NC50

[Features]
With the same performance as low contents of beryllium copper, NC50's (Patent No. 3563311) cold-worked drawing products can satisfy the JIS Z3234 Class 3 standards. They can be used as electrode materials and related jigs as well as in a variety of scenes.
[Main Applications]
Electrodes for resistance welding, chip base, gun arms, and plunger chips.
 

Examples of practical uses of NC Alloys

Either material can be used as plunger chips for die-casting machines. Based on our experience, NC 50 is better suited.
Since NC50 was developed, huge auto manufactures have been using it to produce plunger chips, and it has established a great repltation.
In addition, our advanced technology has been implemented by top-notch die- cast makers in Japan after going through strict tests.
Furthermore, NC alloys provide excellent performance as frictional parts of engines, which are technically forced to be used in harsh environments.
NC Alloys led to the famed “checkered flag” at Fornula-1 race with our technical excellence.
With its high hardness and excellent abrasion resistance, NC50 has been used as brake components of roller coasters material. It realizes, what we call, “long-life material” which may be ten times longer than conventional materials.
In the field of resistance welding, the steel industry utilizes it for seem welding process as an excellent electrode material.
The Mobile phone industry applies it for electrodes in micro-welding to go on precision parts of crystal oscillators.
Last but not the least, NC25 is delivered to major aircraft parts suppliers in the United States which require high standards .
 

Applications for Dies


The heat conductivity of NC alloys is much better than that of generally-used die steel. Indeed they are three times more conductive. They are even more excellent than the extremely strong beryllium copper.
Although NC alloys are ten times more expensive than P-20 group steel, it becomes possible to cover the cost of materials when more than 50,000 shots are molded.
Therefore, a significant advantage can be expected in the case of 100,000 shots.
 

Examples of Presentations to Respective Institutions

 

Patent Application Examples

Heat-Resistant, Abrasion-Resistant, High-Intensity Copper Alloys and Manufacturing Method
Publication number: Japanese Published Unexamined Application No. 9-143596 (not yet requested)
Filing date: November 20, 1995

Copper Alloy Electrode Materials for Resistance Welding and Manufacturing Method
Publication number: Patent No. 3563311
Filing date November: 5, 1999 No. 3563311

High-Intensity, Highly-Conducting Copper Alloys and Manufacturing Method
Applicant: Miyoshi Gokin Kogyo Co., Ltd
Inventors: Itsuo Eguchi, Shigeru Kuramoto
Publication number: Patent No. 2008-223069
Date of publication: September 25, 2008
Filing date: March 12, 2007

High-Intensity, Highly-Conducting Copper Alloys and Manufacturing Method
Applicant: Miyoshi Gokin Kogyo Co., Ltd
Inventors: Itsuo Eguchi, Shigeru Kuramoto, Makoto Arai, Genjiro Hagino
Publication number: Japanese Published Unexamined Application No. 2009-235557 Date of publication: October 15, 2009
Filing date: June 11, 2008

Manufacturing Method of Copper Alloys to be Used for Engine Slide Members
Applicant: Miyoshi Gokin Kogyo Co., Ltd., Honda Motor Co., Ltd.
Inventors: Miyoshi Gokin Kogyo Co., Ltd.: Itsuo Eguchi, Shigeru Kuramoto, Genjiro Hagino, Shigeo Hagino
Honda Motor Co., Ltd.: Kiyoshi Ito, Hiroshi Hinuma
Application number: No. 2009-137367
Filing date: June 8, 2009
 

Research Presentations

1.73rd General Meeting of Japan Society of Mechanical Engineers; New Technology Development Report (April 1996)
"Heat-Resistant, Abrasion-Resistant Cu-Ni-Si-Type Alloys"

2. Spring 2008 Meeting (142nd meeting) of Japan Institute of Metals (March 28, 2008)
"Effects of Heat Treatment Standards on the Mechanical Properties of High Contents of Ni+Si Copper Alloys"

3. 48th Lecture Presentation of Japan Copper and Brass Association (November 23, 2008)
"Effects of Pre-Cold Working on Age Hardening of High Contents of Ni+Si Copper Alloys"

4. 49th Lecture Presentation of Japan Copper and Brass Association (November 11, 2009)
"Effects of Solution Processing Standards on the Solid Solution Amount of High Contents of Ni+Si Copper Alloys After Solution Processing"

5. PRICM7(Pacific Rim International Conference on Advanced Materials and Processing ), Australia (August 3, 2010)
"Effect of Aging Parameters on the Mechanical in Corson Alloy System with High Contents of Ni and Si"

6. 50th Lecture Presentation of Japan Copper and Brass Association (November 5, 2010)
"Effects of Ni+Si Content's Mechanical Properties in Ternary (Cu-Ni-Si) Alloys"
 
 

Prepublication paper

1. "Effects of Heat Treatment Standards and Pre-Cold Working on the Mechanical Properties of High Contents of Ni+Si Copper Alloys"
Copper and Copper Alloys; 48th issue, vol. 1 (2009); pp. 249-253.

2. "Effects of Solution Processing Standards on the Solid Solution Amount of High Contents of Ni+Si Copper Alloys After Solution Processing"
Copper and Copper Alloys; 49th issue, vol. 1 (2010); pp. 15-20.

3. "Effect of Aging Parameters on the Mechanical in Corson Alloy System with High Contents of Ni and Si"
Material Science Forum; vols. 654-656 (2010); pp. 2568–2571.

4. "Effects of Ni+Si Content's Mechanical Properties in Ternary (Cu-Ni-Si) Alloys"
Scheduled to be submitted to the Japan Institute of Metals' journal.
 

Journals/Exhibitions


1. Beryllium-Free Copper Alloys Now Available; FOUNDRY MANAGEMENT & TECHNOLOGY (Mar. 2007)

1. AFS' Exhibition of Casting in Houston (May 2007)
2. GIFA in Dusseldorf (June 2007)
3. Machine Element Technology Exhibition at Tokyo Big Site (June 2007)
4. GE Japan GE Global Research's (central institute) "Japan Technology Forum" at GE Japan Headquarters (October 2007)
5. Tokyo Bureau of Industrial and Labor Affairs' (Commerce and Industry Department) TOKYO SHOWCASE 2008 in London and Dusseldorf (February 2008)
6. Japan International Aerospace Exhibition in PACIFICO Yokohama (October 2008)
7. ASIAN AEROSPACE 2009; ASIA WORLD EXPO in Hong Kong (September 2009)
8. ILA BERLIN AIR SHOW at Berlin Schonefeld Airport (June 2010)
 
Latest Update 01 Feb 2013
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