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Copper Alloy No. C86400

Leaded Manganese Bronze , Leaded High Strength Yellow Brass

 UNS CDA 864

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Copper	59	56	62
Tin	1	.5	1.5
Lead	1	.5	1.5
Zinc	38	34	42
Iron	1.2	.40	2
Nickel (incl Co)	-	-	1
Aluminum	1	.5	1.5
Manganese	.80	.10	1.5

Applications

Free machine components, lever arms, light duty  gears, marine fittings, valve stems.

Mechanical Properties

M02 - As Centrifugal Cast

Hardness*	Brinell Hardness (3000 kg load)	105
Tensile Strength**	KSI	60 min
Yield Strength **	KSI (0.5% Ext. under load)	20 min
Elongation**	% in 2 inch	15 min

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

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	51
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 400 F	.000011
Density	lb/cu in @ 68 F	.301
Electrical Conductivity	% IACS @ 68 F	19
Modulus of Elasticity	KSI	14,000

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)	65
Suitability for being joined by:	Soldering/Fair
	Brazing/Fair*
	Oxyacetylene Welding/Poor
	Gas Shielded Arc Welding/Poor
	Coated Metal Arc Welding/Poor

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