Copper-BerylliumContains berylliumIn production
CB4
CuCo2Be · C17500
CB4 is a CuCo2Be alloy that combines high strength with useful electrical and thermal conductivity. Engine, foundry and welding equipment makers use it for diesel piston heads, die casting plungers and resistance welding electrodes.
550–610 MPaYield strength
690–740 MPaTensile strength
10–15 %Elongation
220–230 HBHardness HB
Specify this grade
Qualification packs are released after a short form. Export control applies.
Properties
Guaranteed values, by temper.
- Alloy family
- Copper-Beryllium
- Chemistry family
- CuCoBe
- Lead-free
- Yes
Forms
Forms & dimensions available
Bars5 variant(s)
Dimensional ranges and tolerances on request — machining and finishing are in house.
Standards
Standards & equivalences
- ASTM B441‐ B534‐ B870
- RWMA Class 3
Product and process qualifications are listed above. Customer approvals are confidential and are not disclosed.
Applications
Markets & applications
Applications
- Piston heads for diesel engines
- Plungers for die casting machines
- Dies for continuous casting of ingots
- Short circuit rings for squirrel cage motors
- Electrodes for resistance welding of thick plates or stainless steel
Why this grade
High strength together with useful electrical and thermal conductivity.
Good anti-friction behaviour for sliding parts such as die casting plungers.
Hardened by quenching and ageing after extrusion, forging or die stamping.
Compliant with RWMA Class 3, the resistance welding electrode class.
Alternatives
If this grade is not the right trade-off.
GradeChemistryYield strengthChoose it when
CB4You are hereCuCoBe610 MPaChoose it when a part must carry load while conducting current or heat, and beryllium is accepted in your process. If it is not, our copper-nickel-silicon and copper-nickel-tin families offer beryllium-free grades.