Gunmetal – multi-constituent bronze

CuSn7Zn2Pb3-C - GS

Standard designation
Classification in accordance with DIN EN 1982 CuSn7Zn2Pb3-C - GS
Material number in accordance with DIN EN 1982 CC492K
Old classification in accordance with DIN 1705 and DIN 1716 G-CuSn6ZnNi
Old material no. 2.1093.01
Chemical composition in weight %
Copper Cu 85.0-89.0 (including nickel)
Nickel Ni < 0.2
Phosphorus P < 0.10
Lead Pb 2.5-3.5
Tin Sn 6.0-8.0
Aluminium Al < 0.01
Iron Fe < 0.2
Sulphur S < 0.10
Antimony Sb < 0.25
Silicon Si < 0.01
Zinc Zn 1.5-3.0
Physical properties
Density g/cm³ 8.7
Melting range °C 830-1030
Amount of shrinkage °C 1.3-1.5
Electr. conductivity at 20°C MS/m 7.9
Thermal conductivity at 20°C W/(m*K) 69
Linear thermal expansion coefficient 10-6/K 18.5
Mechanical properties
Tensile strength Rm (MPa) 230
0.2% - yield strength RP 0.2 (MPa) 130
Elongation at break A (%) 14
Brinell hardness HB10 65
Technological properties
Elasticity modulus GPa 90-96
Flexural strength MPa 80
Shear strength MPa 200-215
Chip brazing and weldability
Machinability 1
Brazing good
Gas welding medium
Inert gas welding poor
Comments
Construction material with good strength and elongation, good for casting, seawater resistant
Notes on use
Is already used frequently as a construction material