Copper Alloy No. C94300

High Leaded Tin Bronze CDA 943

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

 

Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .8
Copper 69.5 67 72
Iron - - .15
Lead 25 23 27
Nickel - - 1
Phosphorus - - .05
Silicon - - .005
Sulfur - - .08
Tin 5.3 4.5 6
Zinc - - .8

 

Applications

High speed bearings for light loads

 

Mechanical Properties

 

M07 - As Continuous Cast

Hardness* Brinell Hardness (500 kg load) 48
Tensile Strength** KSI 21 min
Yield Strength ** KSI (0.5% Ext. under load) 15 min
Elongation** % in 2 inch 7 min

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 36.2
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 392 F N/A
Density lb/cu in @ 68 F .336
Electrical Conductivity* (Annealed) % IACS @ 68 F 9
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.