Spring Material: Beryllium Copper (BeCu)
Strong Non-Magnetic / Non-Sparking Alloy
Beryllium copper is a copper alloy with up to 3% beryllium and includes other elements to obtain high strength with non-magnetic and non-sparking qualities. It has excellent metalworking, forming and machining properties. Beryllium copper alloy 172 is used to make springs.
Grades / Attributes
Beryllium copper is known for its ability to withstand corrosion. Additionally, it has a low torsion modulus which enables it to deliver more force compared to steel in a restrained area. Because it is formed soft and then becomes hard after heat treating, the material is very effective in spring applications. Beryllium copper also has great electrical connectivity which might be desired in certain applications. It is an alternative material for phosphorus bronze and Monel K-500.
Anything that needs long-life corrosion-resistance to salt water. Examples include springs used in nuclear submarine hatch covers and in valves for off shore oil rigs.
Beryllium Copper is roughly two-thirds the cost of Inconel®.
Beryllium can be somewhat hazardous.