High Silicon Bronze A , CDA 655 Everdur
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Copper | 97 | Rem. | Rem. |
| Lead | - | - | .05 |
| Iron | - | - | .80 |
| Zinc | - | - | 1.5 |
| Manganese | .90 | .50 | 1.3 |
| Silicon | 3 | 2.8 | 3.8 |
| Nickel | - | - | .60 |
Applications
Aircraft: Hydraulic pressure lines.
Hardware: Bolts, burrs, butts, clamps, cotter pins, hinges, marine hardware, nails, nuts, pole line hardware, screws.
Industrial: Bearing plates, bushings, cable, channels, chemical equipment, heat exchanger tubes, kettles, piston rings, tanks, rivets, screen cloth and wire, screen plates, shafting.
Marine: Propeller shafts.
Common Fabrication Processes
Blanking, drawing, forming and bending, heading and upsetting, hot forging and pressing, roll threading and knurling, shearing, squeezing and swaging.
Mechanical Properties
Typical for 1" Rod Hard (36%) Temper
| Hardness* | Rockwell B Scales | 90 |
| Tensile Strength** | KSI | 92 |
| Yield Strength** (.5% EAU) | KSI | 55 |
| Elongation** | % in 2 inch | 22 |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 21 |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 572 F | .0000100 |
| Density | lb/cu in @ 68 F | .308 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 7 |
| Modulus of Elasticity (Tension) | KSI | 15,000 |
*Volume basis
Fabrication Properties
| Capacity for being cold worked | Excellent |
| Capacity for being hot formed | Excellent |
| Hot forgeability rating (forging brass =100) | 40 |
| Suitability for being joined by: | Soldering/Good |
| Brazing/Excellent | |
| Oxyacetylene Welding/Good | |
| Gas Shielded Arc Welding/Excellent | |
| Coated Metal Arc Welding/Fair | |
| Resistance Welding | Spot/Excellent |
| Seam/Excellent | |
| Butt/Excellent |