C47000
Naval Brass stands as a copper-zinc alloy in a 60:40 ratio, enriched with around 1% tin to bolster its corrosion resistance, particularly countering dezincification. This alloy adopts a two-phase alpha-beta configuration, granting it a relatively robust strength profile albeit displaying lower ductility compared to the single-phase 70:30 or alpha brass. Its application finds a stronghold in structural contexts and forgings, especially in scenarios where exposure to seawater might induce corrosion. The mechanical attributes of Naval Brass closely mirror those of 60:40 brass C28000, with the tin addition contributing to a slightly heightened strength. C47000 exhibits favorable responsiveness to hot working and is amenable to cold working as well, albeit not as seamlessly as the single-phase alpha brasses.
CHEMICAL COMPOSITION
Elements | Min (%) | Max (%) |
Cu | 57.00 | 61.00 |
Pb | – | 0.05 |
Sn | 0.25 | 1.00 |
Al | – | 0.01 |
Total Others | – | 0.40 |
Zn | Remainder |
MECHANICAL PROPERTIES ACCORDING TO UNS C47000
Mechanical properties as agreed between purchaser and supplier. |
PHYSICAL PROPERTIES | |
Density | 8.9 g/cm³ |
Fabrication Properties | |
Technique | Suitability |
Soldering | Excellent |
Brazing | Excellent |
Oxyacetylene Welding | Good |
Gas shielded Are Welding | Fair |
Coated Metal Are Welding | Not Recommended |
Spot Weld | Good |
Seam Weld | Fair |
Butt Weld | Good |
Capacity for Being Cold Worked | Fair |
Capacity for Being Hot Formed | Excellent |
Forgeability Rating | 90 |
Machinability Rating | 30 |