presents
Materials North America
Copper and Brass Sales
C642 aluminum silicon bronze is an alloy at least as resistant to corrosion as copper itself, but much stronger. It is non-magnetic and has good fatigue and galling resistance. C642 has a machinability rating of 60% which gives it the highest machinability of all the bronzes and brasses. In addition to the high machinability rating, C642 is known for its strength, hot forgeability, corrosion and wear resistance. Soldering and oxyacetylene welding are not recommended. Joining by brazing and other welding methods such as gas shielded arc welding is fair. Typical applications for C642 are studs, nuts, bolts, valve stems, gears, marine hardware and valves bodies and components.
Characteristics
Hot Working
C64200 has excellent hot workability and is used for hot forging.
Cold Working
C64200 has poor cold workability and cold working is not recommended.
Joining and Fabrication
Joining by soldering or oxyacetylene welding is not recommended. Joining by brazing and other welding methods such as gas shielded arc welding is fair.
Applications
Although not recommended for cold working or welding, this alloy has exceptionally high strength and is well suited for studs, bolts, and forgings for heavy switchgear and electrical hardware, especially in outdoor applications. C64200 is considered to be one of the best valve stem alloys. Other applications include gears, marine hardware, nuts, pole line hardware, and valve bodies and components.
California Resident Notice: 
