Standard designation

Marking according to DIN EN 1982: CuSn3Zn8Pb5-C - GS
Material number according to DIN EN 1982: CC490K
Old mark based on DIN 1705 and DIN 1716: G-CuSn2ZnPb
Old material no.: 2.1098.01

Chemical composition in wt. %

Copper Cu: 81,0-86,0 (indluding nickel)
Nickel Ni: < 2,0
Phosphorus P: < 0,05
Lead Pb: 3,0-6,0
Tin Sn: 2,0-3,5
Aluminium Al: < 0,01
Iron Fe: < 0,5
Sulphur S: < 0,10
Antimony Sb: < 0,30
Silicon Si: < 0,01
Zinc Zn: 7,0-9,5

Physical properties

Density g/cm³ 8,7
Melting range °C 830-1040
Shrinkage value °C 1,3-1,5
Electr. conductivity at 20 °C MS/m 8,5
Thermal conductivity at 20 °C W/(m*K) 71
Linear expansion coefficient 10-6/K 18,0

Mechanical characteristics

Tensile strength Rm (MPa) 180
0,2 % - yield strength RP0,2 (MPa) 85
Ultimate tensile strength A (%) 15
Brinell hardness HB10 60

Technological properties

Elastic modulus GPa 90-95
Flexural fatique strength MPa 110
Shear strength MPa 155-170

Machining brazing-soldering and weldability

Machinability 1
Brazing medium
Gas welding poor
Inert gas welding poor

Comments

Medium-hard structural material, well castable, corrosion resistant against process water even at high temperatures.

Notes on usage

The alloy is specifically used for thin-walled valves (up to 12 mm wall thickness); suitable up to 225 °C.

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