SWISSMETAL (BP5)   CuSn5Pb    C53400                                    AVINS 

Guaranteed composition

Cu remainder      Sn 3.80 - 5.00      Pb 0.80 - 1.20

Main technological
characteristics

Machinable quality of the alloy C51000.

If a higher machinability rate is desired, it would be preferable to use the alloy BZ4 (C54400)

Delivery form 

Specialties

wires, rods (f max 0.240" - 0.350") and profiles

 small drawn dimensions

Physical properties

density (68 °F)
electrical conductivity
thermal conductivity
thermal capacity (specific heat)
coefficient of thermal expansion
magnetic properties
melting interval
color

0.318 lb/in³
20 %IACS
610.1 Btu.in./h.ft².°F
0.091 Btu/lb.°F
0.000010 in/in. °F
non magnetic
1706 – 1940 °F
brown

Capacity for
forming/machining

machinability rating (free cutting brass = 100)
tool life (free cutting brass = 110)
tendency for short chips (free cutting brass = 90)
capacity for cold working
capacity for hot working
capacity for soft soldering
capacity for hard soldering
capacity for welding
thermal stress relief
annealing
capacity for polishing
capacity for galvanic plating

middle (60)
middle (60)
middle (65)
middle
poor
good
middle-poor
middle-poor
460°F - 4h at temp. 930°F - 1h at temp. good
good

Typical mechanical
properties for rods

modulus of elasticity = 17,691,415 PSI

Corrosion resistance

stress corrosion
industrial atmosphere
rural atmosphere
marine atmosphere
chlorine (humid)
vinegar
fresh water
high relative humidity and elevated temperature
sea water
stress corrosion

no sensitivity
good
good
good
poor
middle
good
middle-good
good
good

galvanic:

Copper alloys present a high and positive standard potential of corrosion. Consequently, there is a risk of galvanic corrosion if they enter into contact with material of lower standard potential such as, for example, steels containing less than 13% chromium.

Typical applications

• Electrical spring contacts
• All electrical or electronics applications with a risk of stress corrosion
• Components for safety locks