SWISSMETAL (BZ5)             C51000                                    AVINS 

Guaranteed composition

Sn 4.50 - 4.90       P 0.06 – 0.10       Cu remainder

Main technological
characteristics

 Phosphor bronze with high mechanical strength

Delivery  form

Specialties

drawn in round cross sections 

small diameters in wire (f max 0.240") and rod (f max 0.355")

Physical properties

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

0.319 lb/in³
20 %IACS
48.4 Btuft^.h^.°F
0.091 Btu/lb^.°F
9.9 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

poor (20)
poor (20)
poor (20)
very good
poor
good
good
good (resistance welding)
465°F - 4h at temp.
1020°F - 1h at temp.
good
good

Guaranteed mechanical
properties for rods

modulus of elasticity = 16,700,000 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

not or slightly sensitive
good
good
good
poor
average
good
average-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

applications with a risk of stress corrosion
spring contacts for electrical connectors
cold worked parts