UNS C69100
Tungum, a bronze alloy of copper, aluminium,, nickel, tin, and zinc
UNS C69100, also known as Tungum alloy, CW700R and CZ127, is a bronze copper alloy. It has a naturally occurring oxide layer, which on exposure to reagents develops into a very thin protective coating. Tungum resists both pitting and crevice corrosion in marine environments/atmospheres. This offers excellent service-life, even at intermittent duty in the corrosive "splash" zone.
Tungum is non-magnetic and has non-sparking properties. This allows Tungum to be used in high pressure gas pipework systems (oxygen and inert gases). Unusually for a copper alloy, it can be precipitation hardened using heat treatment techniques. This enables its physical properties to be modified as required, to suit various applications. It can be used for low temperature (cryogenic) applications.
In the decade after World War I, Sidney Tungay, a metallurgist, was experimenting with a new copper-based alloy which he hoped would look like gold when polished and which would be durable in everyday use.
The public source identifies “UNS C69100” as tungum, a bronze alloy of copper, aluminium,, nickel, tin, and zinc. This brief keeps that definition visible, then builds a research path around C69100, Tungum and bronze.
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