Alloys

CuSn4

Standard designations

EN CW450K/UNS C51100

Chemical composition
Cu Rest
Sn [%] 4
P [%] 0.1
Description/applications

CuSn4 is one of the copper-tin alloys. CuSn4 is the alloy with the highest electrical conductivity within the bronze group. Applications: Plug connectors, components from the electronics industry, contact pins, relay connections

Physical properties¹
Density 8.9 g/cm³
Electrical conductivity 11.5 m/Ω·mm²
20 % IACS²
Thermal conductivity 84 W/m·K
Thermal expansion coefficient 18.2·10-6/K
E modulus 118 GPa
¹Approximate values in soft state, measured at ambient temperature
² IACS = International Annealed Copper Standard
Processing information
Weldability good
Solderability very good
Stress crack corrosion None
Mechanical properties
State Tensile strength Rm [MPa] Yield strength Rp0.2 [MPa] Elongation
A50 [%]		 Hardness
HV
R290/H70 290-390 max. 190 min. 40 70-100
R390/H115 390-490 min. 210 min. 11 115-155
R480/H150 480-570 min. 420 min. 4 150-180
R540/H170 540-630 min. 490 min. 3 170-200
R610/H190 min. 610 min. 540 - min. 190

More information

Data sheet
File type
CuSn4
PDF (297.44 KB)