Copper Alloy No. C48500

Naval Brass , ASTM B21 CDA 485 

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Copper	60	59	62
Lead	1.8	1.3	2.2
Iron	-	-	.10
Tin	.70	.50	1
Zinc	37.5	Remainder

Applications

Marine hardware, screw machine products, valve stems.

Common Fabrication Processes

Hot forging, pressing and machining.

Hardness*	Rockwell B Scales	82
Tensile Strength**	KSI	75
Yield Strength** (.5% EAU)	KSI	53
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)	67
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 572 F	.0000118
Density	lb/cu in @ 68 F	.305
Electrical Conductivity* (Annealed)	% IACS @ 68 F	26
Modulus of Elasticity (Tension)	KSI	15,000

*Volume basis

Capacity for being cold worked	Poor
Capacity for being hot formed	Good
Machinability rating (Free Cutting Brass=100)	70
Suitability for being joined by:	Soldering/Excellent
	Brazing/Good
	Oxyacetylene Welding/Not Recommended
	Gas Shielded Arc Welding/Not Recommended
	Coated Metal Arc Welding/Not Recommended
Resistance Welding	Spot/Not Recommended
	Seam/Not Recommended
	Butt/Fair

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.