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/F @ 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.