Bearing Bronze C93200·SAE 660

Copper Alloy No. C93200

SAE 660 Bearing Bronze , High Leaded Tin Bronze , 83-7-7-3

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Aluminum	-	-	.005
Antimony	-	-	.35
Copper	83	81	85
Iron	-	-	.20
Lead	7	6	8
Nickel	-	-	1
Phosphorus	-	-	.15
Silicon	-	-	.005
Sulfur	-	-	.08
Tin	6.7	6.3	7.5
Zinc	3	2	4

C93200 has excellent machining properties, good hardness, strength and wear resistance with excellent antifriction qualities. The alloy is not subject to dezincification and has reasonable corrosion resistance to seawater and brine making it suitable for pump and valve components.

C93200 is suitable for bearings, bushings having medium loads and speeds with adequate lubrications.

Applications

General utility bearings, bushings and wear plate.

Mechanical Properties

M07 - As Continuous Cast

Hardness*	Brinell Hardness (500 kg load)	65
Tensile Strength**	KSI	35 min
Yield Strength**	KSI (0.5% Ext. under load)	20 min
Elongation**	% in 2 inch	10 min

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

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	33.6
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 392 F	.000010
Density	lb/cu in @ 68 F	.322
Electrical Conductivity* (Annealed)	% IACS @ 68 F	12
Modulus of Elasticity	KSI	14,500

*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)	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

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

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Bearing Bronze C93200·SAE 660

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