Leaded Naval Brass Alloy C48500
Copper Alloy No. C48500
Naval Brass , ASTM B21 CDA 485
Chemical Composition % by weight
Naval Brass , ASTM B21 CDA 485
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Copper | 60 | 59 | 62 |
| Lead | 1.8 | 1.3 | 2.2 |
| Iron | - | - | .10 |
| Tin | .70 | .50 | 1 |
| Zinc | 37.5 | Remainder | |
Applications
Marine hardware, screw machine products, valve stems.
Common Fabrication Processes
Hot forging, pressing and machining.
Mechanical Properties
Typical for 1" Rod Half Hard (20%) Temper
| Hardness* | Rockwell B Scales | 82 |
| Tensile Strength** | KSI | 75 |
| Yield Strength** (.5% EAU) | KSI | 53 |
| Elongation** | % in 2 inch | 15 |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 67 |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 572 F | .0000118 |
| Density | lb/cu in @ 68 F | .305 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 26 |
| Modulus of Elasticity (Tension) | KSI | 15,000 |
*Volume basis
Fabrication Properties
| Capacity for being cold worked | Poor |
| Capacity for being hot formed | Good |
| Machinability rating (Free Cutting Brass=100) | 70 |
| 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 |