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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.

Mechanical Properties

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/F @ 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.