Standard designation

Marking according to DIN EN 1982: CuSn7Zn4Pb7-C - GS
Material number according to DIN EN 1982: CC493K
Old mark based on DIN 1705 and DIN 1716: G-CuSn7ZnPb
Old material no.: 2.1090.01

Chemical composition in wt. %

Copper Cu: 81,0-85,0 (including nickel)
Nickel Ni: < 2,0
Phosphorus P: < 0,10
Lead Pb: 5,0-8,0
Tin Sn: 6,0-8,0
Aluminium Al: < 0,01
Iron Fe: < 0,2
Sulphur S: < 0,10
Antimony Sb: < 0,3
Silicon Si: < 0,01
Zinc Zn: 2,0-5,0

Physical properties

Density g/cm³ 8,8
Melting range °C 860-1020
Shrinkage value °C 1,3-1,5
Electr. conductivity at 20 °C MS/m 7,5
Thermal conductivity at 20 °C W/(m*K) 64
Linear expansion coefficient 10-6/K 18,5

Mechanical characteristics

Tensile strength Rm (MPa) 230
0,2 % - yield strength RP0,2 (MPa) 120
Ultimate tensile strength A (%) 15
Brinell hardness HB10 60

Technological properties

Elastic modulus GPa 98-115
Flexural fatique strength MPa 110
Shear strength MPa 180-190

Machining brazing-soldering and weldability

Machinability 1
Brazing medium
Gas welding poor
Inert gas welding poor

Comments

Medium-hard sliding-bearing material with good antifriction properties; resistant to seawater.

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