C38500 Architectural Bronze
Copper Alloy No. C38500
Architectural Bronze , CDA 385
Chemical Composition % by weight
Architectural Bronze , CDA 385
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Copper | 57 | 55 | 59 |
| Lead | 3 | 2.5 | 3.5 |
| Iron | - | - | .35 |
| Zinc | 40 | Rem. | Rem. |
Applications
Architectural extrusions, trim, butts, hinges, lock bodies.
Common Fabrication Processes
Hot forging and pressing, hot forming and bending, machining.
Mechanical Properties
Typical for 1" dia. rod as extruded
| Hardness* | Rockwell B Scales | 65 |
| Tensile Strength** | KSI | 60 |
| Yield Strength (.2% Offset)** | KSI | 20 |
| Elongation** | % in 2 inch | 30 |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 71 |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 572 F | .0000209 |
| Density | lb/cu in @ 68 F | .306 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 28 |
| Modulus of Elasticity | KSI | 5,300 |
*Volume basis
Fabrication Properties
| Capacity for being cold worked | Poor |
| Capacity for being hot formed | Excellent |
| Hot forgeability rating (forging brass =100) | - |
| Hot working temperature | 1150-1350 F (625-725 C) |
| Annealing temperature | 800-1100 F (425-600 C) |
| 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/Not Recommended | |
| Resistance Welding | Spot/Not Recommended |
| Seam/Not Recommended | |
| Butt/Fair |