Copper Alloy No. C93800
High Leaded Tin Bronze SAE 67 , CDA 938 , 78-7-15
ASTM B 505 , ASTM B 271, ASTM B 584
Chemical Composition % by weight
Element Nominal Minimum Maximum Aluminum - - .005 Antimony - - .8 Copper 77 75 79 Iron - - .15 Lead 14.5 13 16 Nickel - - 1 Phosphorus - - .05 Silicon - - .005 Sulfur - - .08 Tin 6.9 6.3 7.5 Zinc - - .8
Bearings for general service and moderate pressures, pump impellers and bodies for use in acid mine water. Turbocharger bearings.
M07 - As Continuous Cast
Hardness* Brinell Hardness (500 kg load) 55 Tensile Strength** KSI 30 Yield Strength ** KSI (0.5% Ext. under load) 16 Elongation** % in 2 inch 18
**Test values are nominal approximations and depend on specimen size and orientation.
Thermal Conductivity BTU/ (sq ft-ft-hr-F) 30 Specific Heat BTU/lb/ºF @ 68F .09 Thermal Expansion Per °F from 68 F to 400 F .0000103 Density lb/cu in @ 68 F .334 Electrical Conductivity* (Annealed) % IACS @ 68 F 11.5 Modulus of Elasticity KSI 10,500
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.