Copper Alloy No C91100

Copper Alloy No. C91100

Tin Bronze

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Aluminum	-	-	.005
Antimony	-	-	.20
Copper	84	82	85
Iron	-	-	.25
Lead	-	-	.25
Nickel	-	-	.50
Phosphorus	-	-	1
Silicon	-	-	.005
Sulfur	-	-	.05
Tin	16	15	17
Zinc	-	-	.25

Applications

Piston rings, bearings, bushings, bridge plates. 

Mechanical Properties

M07 - As Continuous Cast

Hardness*	Brinell Hardness (3000 kg load)	135
Tensile Strength**	KSI	35
Yield Strength **	KSI (0.5% Ext. under load)	25
Elongation**	% in 2 inch	2

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

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	40.8
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 392 F	.0000102
Density	lb/cu in @ 68 F	.317
Electrical Conductivity* (Annealed)	% IACS @ 68 F	8
Modulus of Elasticity	KSI	15,000

*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)	10
Suitability for being joined by:	Soldering/Excellent
	Brazing/Good*
	Oxyacetylene Welding/Fair
	Gas Shielded Arc Welding/Fair
	Coated Metal Arc Welding/Fair

*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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