Copper Alloy No. C94800
Leaded Nickel Tin Bronze CDA 948
ASTM B 505
Chemical Composition % by weight
Element Nominal Minimum Maximum Aluminum - - .005 Antimony - - .15 Copper 86.5 84 89 Iron - - .25 Lead .70 .30 1 Manganese - - .20 Nickel 5.3 4.5 6 Phosphorus - - .05 Silicon - - .005 Sulfur - - .05 Tin 5 4.5 6 Zinc 1.8 1 2.5
Applications
Structural castings, gear components, motion translation devices, machinery parts, bearings.
M07 - As Continuous Cast
Hardness* Brinell Hardness (500 kg load) 80 Tensile Strength** KSI 40 min Yield Strength ** KSI (0.5% Ext. under load) 20 min Elongation** % in 2 inch 20 min **Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity BTU/ (sq ft-ft-hr-F) 22.3 Specific Heat BTU/lb/ºF @ 68F .09 Thermal Expansion Per °F from 68 F to 572 F .000011 Density lb/cu in @ 68 F .320 Electrical Conductivity* (Annealed) % IACS @ 68 F 12 Modulus of Elasticity KSI 15,000 *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 Yes Machinability rating (Free Cutting Brass=100) 50 Suitability for being joined by: Soldering/Excellent Brazing/Good* Oxyacetylene Welding/Not Recommended Carbon Arc 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.