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.
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.