C84400 / 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 |