CDA 844 Bronze Alloy

Element % Nominal Minimum Maximum
Aluminum .005
Antimony .25
Copper 81 78 82
Iron .40
Lead 7 6 8
Nickel 1
Phosphorus 1.5
Silicon .005
Sulfur .08
Tin 3 2.3 3.5
Zinc 9 7 10
Hardness BHN (500 kg load) 55
Tensile Strength ksi 30
Yield Strength ksi (.5% ext. under load) 15
Elongation % in 2 inch 16

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.

Applications :
General hardware, ornamental castings, plumbing supplies and fixtures, low pressure valves and fittings.

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) 90
Suitability for being joined by : Soldering/Excellent
Brazing/Good*
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Not Recommended
Coated Metal Arc Welding/Fair

Physical Properties :

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 41.9
Specific Heat BTU/lb/ºF @ 68F .09
Thermal Expansion Per °F from 68 F to 500 F .000010
Density lb/cu in @ 68 F .314
Electrical Conductivity % IACS @ 68 F 16.4
Modulus of Elasticity KSI 13,000