EN: CW109C
UNS: C19010, C19015
KM Europa Metal AG

A copper alloys containing nickiel and silicon are heat treated. CuNi1Si has excellent cold and hot forming, good resistance to atmospheric corrosion, high mechanical and electrical properties, high wear resistance and fatigue strength.


Connectors, slide bearings, leadframe, electrical contact elements, clips for electrical contact lines, power supply and grounding, high corrosion resistance mechanical equipment, fittings. Literature:

Slide bearings technology, electrical technology, railway engineering, general mechanical engineering, die casting practice.
Chemical composition

Chemical composition
Value Comments
Cu [ wt.% ]97,08-98,3
Fe [ wt.% ]0-0,2

Mn [ wt.% ]0-0,1

Ni [ wt.% ]1,0-1,6

Pb [ wt.% ]0-0,02

Si [ wt.% ]0,4-0,7

Others [ wt.% ]0,3

Mechanical properties

Mechanical properties
HardnessYoung’s modulus
Kirchhoff’s modulus
Poisson ratio
No data No data

Material's mechanical and electrical properties in different tempers 

TemperTensile strength, MPaYield strength (min), MPaElongation (min)A50mm, %HardnessLiterature
R360/H100 360-430 250 12 100-130 HV
R410/H130 410-480 360 10 130-150 HV
R460/H140 460-530 430 8 140-160 HV
R520/H150 520-570 490 5 150-170 HV
R580/H175 580-650 540 6 175-205 HV
R440, Rod 440 300 16 (Lo=5,65*(So)0,5)   EN 12163 (2011)
R540, Rod 540 470 10 (Lo=5,65*(So)0,5)  
R590, Rod 590 540 12 (Lo=5,65*(So)0,5)  
R440, Wire 440 300 16 (Lo=5,65*(So)0,5)   EN 12167 (2011)
R540, Wire, rod, sheet, strip, tube. 540 470 12 (Lo=5,65*(So)0,5)  
R590, Wire, rod, sheet, strip, tube. 590 540 10 (Lo=5,65*(So)0,5)  
R240, Rod min. 240 90 25 (A100)  
R300, Rod min. 300 210 16 (A)  
R350, Rod min. 350 280 12 (A)  
R410, Rod min. 410 320 5 (A100)  
R440, Rod min. 440 320 12 (A100)  
R500, Rod min. 500 420 10 (A)  
R540, Rod min. 540 450 10 (A)  
R590, Rod min. 590 570 8 (A100)  
R250, Profile min. 250 100 35 (A)  
R380, Profile min. 380 250 8 (A)  
R420, Profile min. 420 260 15 (A)  
R560, Profile min. 560 520 10 (A)  
R410, Wire min. 410 400 6 (A11,3)  
R450, Wire min. 450 440 5 (A100)  
R590, Wire min. 590 580 7 (A100)  
R650, Wire min. 650 620 7 (A100)  


Modulus of elasticity vs. temperature of CuNi1Si


 Mechanical properties vs. temperature below 0°C of CuNi1Si (age hardened at 450°C for 2 hour)


Electrical conductivity vs. annealing temperature of CuNi2Si

Exploitation properties

 Heat resistance of CuNi1Si


Influence of annealing temperature and time on CuNi1Si mechanical properties after cold deformation of 80%

Effect of Temperature on the strength and fracture toughness of precipitation hardened CuNiSi



Type of corrosion





Marine environment


Stress crack

Not resistant

Hydrogen embrittlement

No data



No data



No data


Residual stress of CuNi1Si at 150°C (temper R580) 

 Creep strength of CuNi1Si supersaturated hardened


 Creep strength of CuNi1Si thermally hardened

 Fatigue strength on bending vs number of cycles of CuNi1Si

Measured J versus crack extension, a, from a series of fracture toughness tests at -80oC with CT precipitation hardened CuNiSi specimens. a assumed as half the height of the triangular fractured surface .

Measured J versus crack extension, a, from a series of fracture toughness tests at -196oC with CT precipitation hardened CuNiSi specimens. a assumed as half the height of the triangular fractured surface

Fabrication properties

Fabrication properties
Value Comments


Hot dip tinninggood

Electrolytic tinninggood

Electrolytic silveringgood

Electrolytic nickel coatinggood

Laser weldingfair

Oxyacetylene Weldingnot recommended

Gas Shielded Arc Weldingfair

Spot Weldgood

Seam Weldgood

Butt Weldgood

Capacity for Being Cold Workedgood

Capacity for Being Hot Formedgood

Machinability Rating30

The variations of hardness and electrical resistivity of Cu1.5 Ni-0.3Si-0.03P-0.05Mg leadframe alloy with varying aging time at 450°C. Cu-1.5Ni-0.3Si-0.03P-0.05Mg is cold rolled 80% and aged at 450°C after solution treatment; (a) hardness, (b) electrical resistivity . 


The comparison of tensile strength and elongation of Cu-1.5Ni-0.3Si-0.03P-0.05Mg leadframe alloy with different initial grain size; (a) initial grain size of 10 µm after solution treatment at 700°C, (b) initial grains size of 15 µm after solution treatment at 800°C .


The variation of (a) hardness and (b) electrical resistivity of Cu-1.5Ni-0.3Si-0.03P-0.05Mg leadframe alloy cold rolled to 40, 70, 85% with increasing aging time at 450°C .


The variation of tensile properties of Cu-1.5Ni-0.3Si-0.03P- 0.05Mg leadframe alloy with varying cold rolling ratio from 40 to 85% at peak aged condition at 450°C .


The dependence of the microhardness on the aging time of CuNi3Si and CuNi1Si. (Note: Samples (strip) was solution heat-treated for 1 h at 1173 K in an argon atmosphere and water quenched)

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