C95800 / CDA 958 Aluminum Bronze Alloys

CDA 958 ASTM B 505 , ASTM B 271
Chemical Composition % by weigh :

Element Nominal Minimum Maximum
Aluminum 9 8.5 9.5
Copper 81 79
Iron 4 3.5 4.5
Manganese 1 .8 1.5
Nickel 5 4 5
Silicon .10

Applications :
Propeller hubs, blades and other parts in contact with salt water.

Mechanical Properties (as cast) :
M07 – As Continuous Cast

Hardness* Brinell Hardness (3000 kg load) 159
Tensile Strength** KSI 90
Yield Strength ** KSI (0.5% Ext. under load) 38
Elongation** % in 2 inch 18

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

Physical Properties :

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 20.8
Specific Heat BTU/lb/ºF @ 68F .105
Thermal Expansion Per °F from 68 F to 572 F .000009
Density lb/cu in @ 68 F .276
Electrical Conductivity* (Annealed) % IACS @ 68 F 7.1
Modulus of Elasticity KSI 16,500

*Volume basis

Fabrication Practices :

Stress relieving temperature 600 F or 316 C
Time at temperature 1 hour per inch of section thickness
Responds to heat treatment *
Machinability rating (Free Cutting Brass=100) 50
Suitability for being joined by: Soldering/Good
Brazing/Fair
Oxyacetylene Welding/Not Recommended
Carbon Arc Welding/Poor
Gas Shielded Arc Welding/Good
Coated Metal Arc Welding/Good