Properties of Neyoro® G

The high gold content alloy for high precision applications.  Neyoro G is a high gold content alloy containing platinum, silver and copper. It is resistant to tarnish and corrosion has high strength and hardness and relatively low electrical resistivity. These properties make it exceptionally useful as a sliding contact or slip ring and also as a resistance wire.  Neyoro G responds to heat treatment. Age hardening increases its strength and hardness and decreases resistivity, while annealing has the opposite effect.  Neyoro G meets ASTM Standard specification B541 for gold electrical contact alloy.

View Properties Table

Properties of Neyoro G Annealed Stress-Relieved HT-A
(Age-Hardened from Annealed Cond.)
HT-CW
(Age-Hardened from Work-Hardened Cond.)

Resistivity, nominal, ohm-cmf

135

125

87

87

microhm cm

22.4

20.8

14.5

14.5

Densitiy, nominal grams/cc

15.9

15.9

15.9

15.9

Dwt./cu. in.

167.5

167.5

167.5

167.5

Solidus Temperature,

 

 

 

 

nominal, F

1700

1700

1700

1700

C

925

925

925

925

Coefficient  Of Linear Expansion Nominal

 

 

 

 

/F (70 - 212F)

7x10-6

7x10-6

7x10-6

7x10-6

/C (20 - 100C)

12.6x10-6

12.6x10-6

12.6x10-6

12.6x10-6

Thermal emf vs. Platinum, (0 - 100C), uv/C nominal

+3

+4

+4

+4

Fatigue strength (rotating - bending) at 10(8) cycles, psi

-

35,000

-

30,000

Modulus of Elasticity, psi, nominal

16x106

16x106

16x106

16x106

Wire Properties

 

 

 

 

Proportional Limit, psi, nominal

70,000

120,000

115,000

130,000

Ultimate Tensile Strength, psi

 

 

 

 

.004 - .020 dia.

85,000-110,000*

130,000-170,000*

130,000-165,000*

150,000-200,000*

.021 - .080 dia.

80,000-110,000*

130,000-170,000*

130,000-165,000*

145,000-195,000*

Elongation, % in 2"

 

 

 

 

.004 - .020 dia.

20 min.

5-15*

7-14*

2-10*

.021 - .080 dia.

16 min.

4-14*

5-14*;

2-10*

Knoop Hardness,** (100-gram load)

 

 

 

 

(50-gram under .005 dia.)

 

 

 

 

.004 - .020 dia.

180-240*

270-340*

280-350*

310-380*

.021 - .080 dia.

180-240*

270-340*

270-340*

290-370*

Properties of Neyoro G Annealed Stress-Relieved HT-A
(Age-Hardened from Annealed Cond.)
HT-CW
(Age-Hardened from Work-Hardened Cond.)

Vickers Hardness,+ (100-gram load)

 

 

 

 

(50-gram under .005 dia.)

 

 

 

 

.004 - .020 dia.

180-250*

270-340*

285-360*

290-370*

.021 - .080 dia. Headed

180-250*

270-340*

285-360*

290-370*

Strip, Ribbon and Rolled Shape Properties

 

 

 

 

Proportional Limit, psi, nominal

65,000

-

115,000

130,000

Ultimate Tensile Strength, psi

 

 

 

 

Strip .003 - .020 thick

85,000-115,000

125,000-165,000

125,000-155,000

140,000-180,000

Elongation, % in 2"*

 

 

 

 

Strip .003 - .020 thick

12 min.

3-16*

3-12*

2-10*

Ribbon (rolled from wire)

20 min.

-

3-12*

2-10*

Knoop Hardness (100-gram load)

 

 

 

 

(50-gram under .005 thick)

 

 

 

 

.003 - .020 thick

200-250*

270-340*

270-340*

290-370*

Vickers Hardness (100-gram load)

 

 

 

 

(50-gram under .005 thick)

 

 

 

 

.003 - .020 thick

180-250*

270-340*

275-340*

290-370*

* The limits of all properties apply only to the sizes specified.
**The values shown are for raw material produced by nominal proceses. In fabricating of certain parts, an additional solution anneal is necessary to        relieve forming and bending stresses. This additional batch anneal will result in tensile strengths 10,000 psi lower than stated and hardness 10 numbers lower than those stated.
+Forming or bending is not recommended for this "temper" of alloy.

The information contained in this Data Sheet is intended to assist you in the use of this product.  It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular application.  The user should determine the suitability of this material for each application.  Data is subject to change without notice.

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