CuSn7Pb6Zn4

 
Half-hard bronze of current use. It is used for the friction parts. Average speed and pressure. Economical price.

Due to its characteristics and its very good workability, that alloy, that can work under low lubrication or momentarily defective, is above all a bronze for mechanics.

Very used in mechanics, car, shipbuiliding industries, faucets, that grade perfectly fits for the manufacturing of rings, bearings, sockets, guides, erosion plates, nuts, screws, gears, shimmings, etc...

Main standards and correspondences:
NFA
EN
MARINE
DIN
ASTM
53 707
EN 1982
C322 - IT134
GAM- MM12
1705 GZ/GC CuSn7ZnPb

B505.836

B271.836

UNI
NBN
ISO
BS
UNS
SAE
1701 / 1703
266
1338
1400 / LG3
C93200
660

 

Chemical compound of cast products (NFA 53-707)

Agent:
Sn
Pb
Zn
Ni
Cu
P
Max. other materials
Others
Fe
S
Si
Al
Mini :

6

5

2

 -

Reste

-

 -

-

-

-

-

Maxi :

8

7

5

1,5

 

-

1

0,2

0,1

0,01

0,01

 

Mechanical characteristics of cast products (NFA 53-707):

Process

Tensile strength Rm in MPa

Conventional elastic limit at 0,2 % (for information) Rp0,2 in MPa

Stretching after breaking A %

Hardness Brinell HBS

Y20

220

100

12

-

Y30

-

-

-

-

Y70 or Y80

260

120

12

-

 

Average physical and mechanical properties (for information only):

Average physical properties:
Liquidus temperature (°C)
Solidus temperature (°C)
Solidification range (°C)
Mass-volume at 20°C (kg/dm3)
Linear expansion coefficient (10-6/°C)
980
850
130
8,80
18
Massive heat capacity at 20°C (J/kg.K)
Heat conductivity at 20°C (W/m.K)
Electrical conductivity at 20°C (%IACS)
Electrical resistivity at 20° C (10-8 W.m)
Coefficient of resistivity temperature from 0 to 100°C (10-3°C)
376
59
12
14,4
6,9
Average mechanical properties:
Young's modulus (MPA)
Modulus of twisting (MPA)
Poisson's ratio
100000
37000
± 0,35