C97800 Nickel Silver Bronze

Copper Alloy No. C97800

Nickel Silver Alloy CDA 978 , 25% Leaded Nickel Silver

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Aluminum	-	-	.005
Antimony	-	-	.20
Copper	65.5	64	67
Iron	-	-	1.5
Lead	1.8	1	2.5
Manganese	-	-	1
Nickel	25.5	24	27
Phosphorus	-	-	.05
Silicon	-	-	.15
Sulfur	-	-	.08
Tin	5	4	5.5
Zinc	2.5	1	4

Applications for Castings

Ornamental and sanitary castings, valves and valve seats, musical instrument components.

Mechanical Properties

Typical for 3" dia. continuous cast bar

Hardness*	Brinell Hardness (3000 kg load)	130
Tensile Strength**	KSI	55
Yield Strength **	KSI (0.5% Ext. under load)	30
Elongation**	% in 2 inch	15

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	14.7
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 500 F	.0000097
Density	lb/cu in @ 68 F	.320
Electrical Conductivity* (Annealed)	% IACS @ 68 F	4.5
Modulus of Elasticity	KSI	19,000

*Volume basis

Fabrication Practices

Stress relieving temperature	500 F or 260 C
Time at temperature	1 hour per inch of section thickness
Responds to heat treatment	No
Machinability rating (Free Cutting Brass=100)	60
Suitability for being joined by:	Soldering/Excellent
	Brazing/Excellent
	Oxyacetylene Welding/Not Recommended
	Carbon Arc Welding/Not Recommended
	Gas Shielded Arc Welding/Not Recommended
	Coated Metal Arc Welding/Not Recommended

*Since brazing is performed at temperatures within the hot-short range, strain must be avoided during the brazing and cooling of this alloy.

The values listed above represent reasonable approximations suitable for general engineering use. Due to commercial variations in composition and to manufacturing limitations, they should not be used for specification purposes. See applicable A.S.T.M. specification references.

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