Gunmetal – multi-constituent bronze

CuSn7Zn4Pb7-C - GS

(CC 483)

Standard description
Classification in accordance with DIN EN 1982 CuSn7Zn4Pb7-C - GS
Material number in accordance with DIN EN 1982 CC493K
Old classification in accordance with DIN 1705 and DIN 1716 G-CuSn7ZnPb
Old material no. 2.1090.01
Chemical composition in weight %
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
Amount of shrinkage °C 1.3-1.5
electr. conductivity at 20°C MS/m 7.5
Thermal conductivity at 20°C W/(m*K) 64
Linear thermal expansion coefficient 10-6/K 18.5
Mechanical properties
Tensile strength Rm (MPa) 230
0.2% - yield strength RP 0.2 (MPa) 120
Elongation at break A (%) 15
Brinell hardness HB10 60
Technological properties
Elasticity modulus GPa 98-115
Flexural strength MPa 110
Shear strength MPa 180-190
Chip brazing and weldability
Machinability 1
Brazing medium
Gas welding poor
Inert gas welding poor
Comments
Medium-hard bearing material with good resistance to galling; seawater-resistant.