Copper Alloy No C97600

Copper Alloy No. C97600

Nickel Silver CDA 976 , Dairy Metal , 20% Leaded Nickel Silver

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Aluminum	-	-	.005
Antimony	-	-	.25
Copper	65	63	67
Iron	-	-	1.5
Lead	4	3	5
Manganese	-	-	1
Nickel	20.3	19	21.5
Phosphorus	-	-	.05
Silicon	-	-	.15
Sulfur	-	-	.08
Tin	4	3.5	4.5
Zinc	6	3	9

Applications for Castings

Marine castings, sanitary fittings, ornamental hardware, valves and pumps. 

Mechanical Properties

Typical for 3" dia. continuous cast bar

Hardness*	Brinell Hardness (500 kg load)	80
Tensile Strength**	KSI	45
Yield Strength **	KSI (0.5% Ext. under load)	24
Elongation**	% in 2 inch	20

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

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	13
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 572 F	.0000093
Density	lb/cu in @ 68 F	.321
Electrical Conductivity* (Annealed)	% IACS @ 68 F	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)	70
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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