   | CuNi3Si EN: CW112C UNS: C70250, C70320 |    |
CuNi3Si(CuNi3Si)
Connectors, leadframe, electrical equipment. CuNi3Si alloy con also be used for current-carrying formed parts and contact springs. Literature: 
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Chemical composition
|
Value | Comments | |
| Cu [ wt.% ] | 93,38-96,1 | Calculated | |
| Fe [ wt.% ] | 0-0,2 | ||
| Mn [ wt.% ] | 0-0,1 | ||
| Ni [ wt.% ] | 2,6-4,5 | ||
| Pb [ wt.% ] | 0-0,02 | ||
| Si [ wt.% ] | 0,8-1,3 | ||
| Others [ wt.% ] | 0,5 | ||
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Mechanical properties
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| UTS [MPa] | YS [MPa] | Elongation [%] | Hardness | Young’s modulus [GPa] | Kirchhoff’s modulus [GPa] | Poisson ratio |
| 590-830 | 440-780 | 5-12 | 180-220 Comments: HB, heat treated | 135 | 50,4 | 0,34 |
Material's mechanical and electrical properties in different tempers
|
Temper |
Tensile strength, MPa |
Yield strength (min), MPa |
Elongation (min) A5 (%) |
Hardness
|
Electrical conductivity % IACS |
Literature |
|---|---|---|---|---|---|---|
|
Bars, squares hexagonals, solution heat treated, artificially aged |
690 |
540 |
8 |
200 HB |
|
DIN 17672-1 (1969) |
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Bars, squares hexagonals; solution heat treated, strain-hardened |
610 |
550 |
8 |
180 HB |
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|
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Bars, squares hexagonals; solution heat treated, strain-hardened, artificially aged; |
830 |
780 |
10 |
220 HB |
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|
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Flats; solution heat treated, artificially aged |
690 |
540 |
8 |
200 |
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R620 |
620-760 |
500 |
10 (A50) |
180-240 HV |
40 |
|
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R690 |
690-860 |
655 |
5 (A50) |
220-260 HV |
40 |
|
|
R610 (H180) |
610-720 |
570 |
>8 (A50) |
180-230 HV |
45 |
|
|
R650 (H190) |
650-740 |
550 |
>12 (A50) |
190-230 HV |
40 |
|
|
R690 (H210) |
690-800 |
660 |
>5 (A50) |
200-240 HV |
40 |
|
|
R720 (H220) |
720-810 |
690 |
>7 (A50) |
210-250 HV |
45 |
|
|
R740 (H225) |
740-850 |
690 |
>5(A50) |
225-250 HV |
35 |
|
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Rod 10-30mm |
650 |
590 |
10 |
195 HB |
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Rod 30-50mm |
650 |
500 |
10 |
195 HB |
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Rod >50 |
590 |
440 |
10 |
190 HB |
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Electrical conductivity vs. temper
Resistance to softening of CuNi3Si
Softening resistance of CuNi3Si for different temper
Type of corrosion | Suitability | Literature |
|---|---|---|
Atmospheric | Good |
|
Marine environment | No data | - |
Stress crack | Resistant |
|
Hydrogen embrittlement | No data | - |
Electrolytic | No data | - |
Other | No data | - |
H temper condition up to 175ᵒC – fair
Stress relaxation of CuNi3Si
Stress relaxation of CuNi3Si at different temperature and temper
The fatigue strength is defined as the maximum bending stress amplitude witch a material withstands for 107 load cycles under symmetrical alternate load without breaking. It is dependent on the temper tested and is about 1/3 of the tensile strength .
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Fabrication properties
|
Value | Literature | Comments | |
| Soldering | good | | ||
| Brazing | good | | ||
| Hot dip tinning | good | | ||
| Electrolytic tinning | good | | ||
| Electrolytic silvering | good | | ||
| Electrolytic nickel coating | good | | ||
| Laser welding | not recommended | | ||
| Oxyacetylene Welding | good | | ||
| Gas Shielded Arc Welding | good | | ||
| Coated Metal Arc Welding | fair | | ||
| Resistance welding | fair | | ||
| Capacity for Being Cold Worked | good | | ||
| Capacity for Being Hot Formed | excellent | | ||
| Forgeability Rating | 40 | | ||
| Machinability Rating | 30 | | ||
The dependence of the microhardness on the aging time of CuNi3Si and CuNi1Si. (Note: Samples (strip) was solution heat-treated for 1h at 1173 K in an argon atmosphere and water quenched)
Variation of the electrical resistivity with time at 673 and 723 K for the CuNi3Si alloy, showing the onset of spinodal decomposition. (Note: Samples (strip) was solution heat-treated for 1 h at 1173 K in an argon atmosphere and water quenched)
(a) Yield strength, tensile strength and elongation of CuNi3Si as a function of aging time at 723 K; (b) yield strength of CuNi3Si as a function of aging time from 723 to 823 K. (Note: The strip was solution heat treated for 1 h at 1173K in an argon atmosphere and water quenched)
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Technological properties
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| Melting temperature [°C] | Casting temperature [°C] | Castability | Annealling temperature [°C] | Homogenization temperature [°C] | Quenching temperature [°C] | Ageing temperature [°C] | Stress relievieng temperature [°C] | Hot working temperature [°C] |
| 1040-1075 | No data | No data | 250-650 Comments: 1-3h | 900 | 900 Comments: 1h | 450-500 | 150-200 Comments: 1-3h | No data |
