Gunmetal – multi-constituent bronze

CuSn5Zn5Pb5-C - GS

Standard designation
Classification in accordance with DIN EN 1982 CuSn5Zn5Pb5-C - GS
Material number in accordance with DIN EN 1982 CC491K
Old classification in accordance with DIN 1705 and DIN 1716 G-CuSn5ZnPb
Old material no. 2.1096.01
Chemical composition in weight %
Copper Cu 83.0-87.0 (including nickel)
Nickel Ni < 0.2
Phosphorus P < 0.10
Lead Pb 4.0-6.0
Tin Sn 4.0-6.0
Aluminium Al < 0.01
Iron Fe < 0.3
Sulphur S < 0.10
Antimony Sb < 0.25
Silicon Si < 0.01
Zinc Zn 4.0-6.0
Physical properties
Density g/cm³ 8.7
Melting range °C 860-1030
Amount of shrinkage °C 1.3-1.5
Electr. conductivity at 20°C MS/m 8.5
Thermal conductivity at 20°C W/(m*K) 71
Linear thermal expansion coefficient 10-6/K 18.2
Mechanical properties
Tensile strength Rm (MPa) 200
0.2% - yield strength RP 0.2 (MPa) 90
Elongation at break A (%) 13
Brinell hardness HB10 60
Technological properties
Elasticity modulus GPa 65-105
Flexural strength MPa 75
Shear strength MPa 165-175
Chip brazing and weldability
Machinability 1
Brazing medium
Gas welding poor
Inert gas welding poor
Comments
Construction material, good for casting, can be soft soldered and to some extent, brazed, seawater-resistant
Notes on use
Water and steam valve housings up to 226°C, pump housings under normal conditions and intricate thin-wall castings