CUSn4Pb4Zn4
EN/DIN
DIN 1733
Copper 3444 (CuSn4Pb4Zn4) contains 4% Pb, ie about 3% of the volume is pure Pb. This bronze is very easy to work with, has good wear properties and is resistant to stress corrosion cracking. It was also characterized by good cold formability.
Bronze 3444 has a mixed crystalline structure. The insoluble Pb additive exists as fine particles in the grain boundaries.
Copper 3444 is used for many parts in the electronics, automotive industry, as well as for bearings, valves, spring fittings and other parts in many industries. The addition of 3% by volume B significantly improves workability. Pb is present in the grain boundaries as fine particles, which is the lead crystallization grains during finer annealing.
With other norms: DIN 2.1076 - EN CuSn4Pb4Zn4
Electrical Properties
|
Electrical Resistance
|
0.105 9*10-4 Ω.mm .m
|
|
Magnetic permeability
|
-
|
|
Magnetic susceptibility
|
Non magnetic
|
Process Properties
|
Machinability
|
good
|
|
Hot Forming
|
low
|
|
Cold Forming
|
medium
|
Thermal Recovery
|
Softening Annealing
|
475-675 ℃
240 min
|
|
Stress Relieving Annealing
|
250 ℃
30 min
|
Descriptive Features
|
Alpha Phase Crystal Structure
|
Below cph, 815 ° C
|
|
Beta Phase Crystal Structure
|
Above bcc, 999 ° C
|
Optical Properties
|
Emissivity(0-1)
|
0.30
|
|
Reflection Coefficient, Visibility(0-1)
|
0.56
|
|
Dimensions mm |
|
CUSn4Pb4Zn4
|
Ø
|
0.400 |
|
Ø
|
1.000 |
|
Ø
|
1.300 |
|
Ø
|
1.500 |
|
Ø
|
2.000 |
|
Ø
|
2.100 |
|
Ø
|
2.200 |
|
Ø
|
2.500 |
|
Ø
|
3.000 |
|
Ø
|
4.000 |
|
Ø
|
4.500 |
|
Ø
|
5.000 |
|
Ø
|
6.500 |
|
Ø
|
7.000 |
|
Ø
|
8.000 |
|
Ø
|
8.500 |
|
Ø
|
9.000 |
|
Ø
|
10.00 |
|
Ø
|
10.50 |
|
Ø
|
11.00 |
|
Ø
|
12.00 |
|
Ø
|
13.00 |
|
Ø
|
14.00 |
|
Ø
|
15.00 |
|
Ø
|
16.00 |
|
Ø
|
18.00 |
|
Ø
|
20.00 |
Bakır 3444 Yuvarlak - Kimyasal Bileşimi
| Cu |
Ni |
Sn |
Fe |
Mn |
ZN |
O |
Pb |
P |
| Bal. |
0.20 max |
4.5
max
|
0.10 max |
1.5 max |
4.5 max |
0.4 max |
4.0 |
0.4 |
Physical Properties
Copper 3444 (CuSn4Pb4Zn4) contains 4% Pb, ie about 3% of the volume is pure Pb. This bronze is very easy to work with, has good wear properties and is resistant to stress corrosion cracking. It is also characterized by good cold formability.