Copper Alloy No C93800

Copper Alloy No. C93800

High Leaded Tin Bronze SAE 67 , CDA 938 , 78-7-15

ASTM B 505 , ASTM B 271, ASTM B 584

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Aluminum	-	-	.005
Antimony	-	-	.8
Copper	77	75	79
Iron	-	-	.15
Lead	14.5	13	16
Nickel	-	-	1
Phosphorus	-	-	.05
Silicon	-	-	.005
Sulfur	-	-	.08
Tin	6.9	6.3	7.5
Zinc	-	-	.8

Applications

Bearings for general service and moderate pressures, pump impellers and bodies for use in acid mine water. Turbocharger bearings.

Mechanical Properties

M07 - As Continuous Cast

Hardness*	Brinell Hardness (500 kg load)	55
Tensile Strength**	KSI	30
Yield Strength **	KSI (0.5% Ext. under load)	16
Elongation**	% in 2 inch	18

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

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	30
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 400 F	.0000103
Density	lb/cu in @ 68 F	.334
Electrical Conductivity* (Annealed)	% IACS @ 68 F	11.5
Modulus of Elasticity	KSI	10,500

*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)	80
Suitability for being joined by:	Soldering/Good
	Brazing/Poor*
	Oxyacetylene 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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