Class 4 Beryllium Copper (RWMA C17200)
Class 4 copper has extremely high hardness and ultimate tensile strength although the electrical conductivity is lower than the Class 3 copper. It is generally recommended as electrode material for special flash, flash butt and projection welding applications where pressures are extremely high and wear is severe but where heating is not excessive. It is available as wrought material for highest quality dies and electrodes and may also be obtained as high strength castings. It is used frequently in the forms of inserts and die facings, and may also be used for seam welder bushings. Class 4 copper is available in the annealed condition, in this state it can be more readily machined and may be subsequently heat treated to maximum hardness.
Typical uses
Electrical
Electrical switch and relay blades, fuse clips, switch parts, relay parts, connectors, spring connectors, current carrying contact bridges, belleville washers, navigational instruments, clips.
Fasteners
Washers, fasteners, lock washers, retaining rings, roll pins, screws bolts.
Industrial
Pumps, springs, electrochemical, shafts, non sparking safety tools, flexible metal hose, house for instruments, bearings, bushings, valve seats, valve stems, diaphragms, springs, welding equipment and parts, rolling mill parts, spline shafts, pump parts, bourdon tubes, wear plates on heavy equipment, bellows.
Ordnance
Firing Pins
Chemical Composition
(%max, unless shown as range or min.,)
|
|
Cu |
Al |
Be |
Co |
Si |
|
Min. Max. |
Rem |
.20 |
1.8-2.0 |
.20 min. |
.20 |
|
Nominal |
98.1 |
- |
1.9 |
- |
- |
Other designations:
Ampcaloy 84, CMW 73, C-4, CL-4, Electraloy 8, H4, T-5, Tuffaloy 44, Tuff 44, Weldaloy 40,
|
