   | CuNi2Si EN: CW111C UNS: C70260, C64700 |    |
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Basic properties
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| Density [g/cm3] | Specific heat capacity [J/(kg*K)] | Temperature coefficient of electrical resistance (0...100°C) [10-3/K] | Electrical conductivity [T=20°C, (% IACS)] | Thermal conductivity [W/(m*K)] | Thermal expansion coefficient 20...300°C [10-6/K] |
| 8,8-8,9 | 377 | 2 | 25-51 | 150-250 | 16,8-18 Comments: (0-400ᵒC) |
Lead frames, connectors, switchgear, fuse clips, contact springs, electronic industries, railway equipment, marine hardware, fittings, resistance-welding electrode holders, bearings, friction pads. The most used wrought forma are sheet, strip, rod and forgings. Literature:
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Chemical composition
|
Value | Comments | |
| Cu [ wt.% ] | 95,9-97,7 | Calculated | |
| Fe [ wt.% ] | 0-0,2 | ||
| Mn [ wt.% ] | 0-0,1 | ||
| Ni [ wt.% ] | 1,6-2,5 | ||
| Pb [ wt.% ] | 0-0,02 | ||
| Si [ wt.% ] | 0,4-0,8 | ||
| Others [ wt.% ] | 0,3 | ||
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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 |
| 300-780 | 120-620 | 10-35 | 70-240 Comments: HV | 128-160 | 48-52 | 0,35 Comments: Calculated |
Materials mechanical and electrical properties in different tempers
| Temper |
Tensile strength, MPa |
Yield strength (min), MPa |
Elongation (min) A50mm, % |
Hardness |
Literature |
|---|---|---|---|---|---|
|
H02, R420, H130 |
420-480 |
380 |
9 |
130-150 HV |
|
|
H03, R460, H140 |
460-530 |
430 |
7 |
140-160 HV |
|
|
H06, R520, H150 |
520-590 |
480 |
5 |
150-170 HV |
|
|
TM10, R600, H180 |
600-670 |
570 |
7 |
180-220 HV |
|
|
TM03, R620, H190 |
620-690 |
580 |
10 |
190-220 HV |
|
|
R460 |
460-580 |
350 |
16 |
150-190 HV |
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|
R580 |
580-650 |
470 |
14 |
170-210 HV |
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|
R620 |
620-720 |
540 |
13 |
180-220 HV |
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|
R680 |
680-780 |
620 |
10 |
200-240 HV |
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Solution heat treated –sheet, strip |
300 |
120 |
35 (L0=5,65(S0)0,5) |
70 HB, 73 HV |
|
|
Solution heat treated and cold working to typical temper–sheet, strip |
440 |
400 |
12 (L0=5,65(S0)0,5) |
120 HB, 125 HV |
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|
Precipitation hardened sheet, strip |
580 |
520 |
14 (L0=5,65(S0)0,5) |
170 HB, 180 HV |
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|
Precipitation hardened after cold working to typical temper sheet, strip |
700 |
650 |
10 (L0=5,65(S0)0,5) |
190 HB, 200 HV |
|
|
Solution heat treated –rod |
300 |
120 |
35 (L0=5,65(S0)0,5) |
70 HB, 73 HV |
|
|
Solution heat treated and cold working to typical temper–rod |
450 550 |
400 520 |
10 (L0=5,65(S0)0,5) 3 (L0=5,65(S0)0,5) |
125 HB, 130 HV 150 HB, 160 HV |
|
|
Precipitation hardened rod |
600 |
540 |
12 (L0=5,65(S0)0,5) |
160 HB, 170 HV |
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|
Precipitation hardened after cold working to typical temper rod |
650 750 |
570 650 |
12 (L0=5,65(S0)0,5) 10(L0=5,65(S0)0,5) |
170 HB, 180 HV 200 HB, 210 HV |
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Solution heat treated –wire |
300 |
120 |
30 (A100) |
- |
|
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Solution heat treated and cold drown to typical temper–wire |
550 |
520 |
- |
- |
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Precipitation hardened after cold drowing to typical temper wire |
750 |
670 |
7 (A100) |
- |
|
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Solution heat treated –tube |
300 |
120 |
35 (L0=5,65(S0)0,5) |
70 HB, 73 HV |
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|
Solution heat treated and cold drown to typical temper–tube |
450 |
380 |
10 (L0=5,65(S0)0,5) |
125 HB, 130 HV |
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Precipitation hardened tube |
550 |
450 |
15 (L0=5,65(S0)0,5) |
170 HB, 180 HV |
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Precipitation hardened after cold drowing to typical temper tube |
720 |
630 |
10 (L0=5,65(S0)0,5) |
200 HB, 210 HV |
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Participation hardened - forgings |
580 |
500 |
12 (L0=5,65(S0)0,5) |
160 HB, 170 HV |
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R430, Strip |
430-520 |
330 |
10 (A) |
|
EN 1654 (1997) |
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R450, Strip |
450-600 |
360 |
3 (A) |
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R510, Strip |
510-600 |
450 |
10 (A) |
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R600, Strip |
min. 600 |
550 |
8 (A) |
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R550, Wire |
min. 550 |
430 |
15 (L0=5,65(S0)0,5) |
|
EN 12166 (2011) |
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R600, Wire |
Min. 600 |
520 |
10 (L0=5,65(S0)0,5) |
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|
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R640, Wire |
Min. 640 |
590 |
8 (L0=5,65(S0)0,5) |
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superseturation |
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70,5 |
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superseturation+ageing |
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183,5 |
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superseturation+ageing+SPD (RCS) |
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223,7 |
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superseturation+ageing+SPD (RCS)+ageing |
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208,3 |
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R370 |
370-420 |
≤240 |
≥18 (A50) |
100-140 HV |
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R430 |
430-520 |
≥320 |
≥13 (A50) |
125-160 HV |
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R450 |
450-560 |
≥360 |
≥8 (A50) |
130-180 HV |
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R510 |
510-600 |
≥450 |
≥5 |
150-180 HV |
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R640 |
≥640 |
≥550 |
≥3 |
≥180 |
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R260 |
min. 260 |
min. 60 |
min. 30 |
65-100 HV |
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R460 |
min. 460 |
min. 300 |
min. 12 |
150-190 HV |
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R380 |
min. 380 |
min. 260 |
min. 6 |
130-170 HV |
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R600 |
min. 600 |
min. 480 |
min. 8 |
min. 190 HV |
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R360 (H100) |
360-430 |
250 |
>12 |
100-130 HV |
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Mechanical properties at low temperature of CuNi2Si
|
Temper |
Testing temperature, °C |
Tensile strength, MPa |
Yield strength (min), MPa |
Elongation A, % |
|---|---|---|---|---|
|
Solution heat treated and cold worked ~35% - Rod |
20 |
700 |
600 |
15 (L0=4,52(S0)0,5) |
|
-60 |
720 |
- |
18 (L0=4,52(S0)0,5) |
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Precipitation hardened – Rod |
22 |
790 |
738 |
15 (L0=4,52(S0)0,5) |
|
-78 |
840 |
779 |
18 (L0=4,52(S0)0,5) |
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-197 |
870 |
802 |
24 (L0=4,52(S0)0,5) |
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-253 |
940 |
832 |
33 (L0=4,52(S0)0,5) |
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-269 |
955 |
842 |
31 (L0=4,52(S0)0,5) |
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Precipitation hardened after cold working ~75% |
20 |
800 |
680 |
9 (L0=5,65(S0)0,5) |
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-20 |
800 |
680 |
10 (L0=4,52(S0)0,5) |
|
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-70 |
820 |
690 |
11,5 (L0=4,52(S0)0,5) |
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-170 |
860 |
720 |
18,5 (L0=4,52(S0)0,5) |
Mechanical properties at elevated temperature of CuNi2Si
|
Temper |
Testing temperature, |
Tensile strength, MPa |
Yield strength 0,5% ext. under load, MPa |
Elongation, % on 2 in. |
|
|
Solution heat treated |
20 |
265 |
- |
- |
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|
200 |
250 |
- |
- |
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|
300 |
245 |
- |
- |
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|
450 |
190 |
- |
- |
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|
600 |
185 |
- |
- |
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Precipitation hardened |
20 |
605 |
590 |
- |
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|
200 |
565 |
550 |
- |
||
|
300 |
500 |
490 |
- |
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|
450 |
355 |
345 |
- |
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|
600 |
240 |
233 |
- |
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Precipitation hardened after cold working 75% |
20 |
740 |
- |
- |
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200 |
690 |
635 |
11,0 |
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300 |
645 |
- |
7,5 |
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400 |
570 |
555 |
4,5 |
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500 |
440 |
412 |
1,5 |
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600 |
235 |
227 |
4,5 |
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700 |
65 |
66 |
32,0 |
Electrical properties CuNi2Si
Stress vs. temperature of CuNi2Si alloy (Aged 450°C – 2 hours)
Elongation vs. temperature of CuNi2Si alloy (Aged 450°C – 2 hours)
Impact energy vs. temperature of CuNi2Si - (Aged 450°C – 2 hours)
Impact energy vs. temperature of CuNi2Si - (Aged 450°C – 2 hours)
Effect of temperature on the strength and fracture toughness of precipitation hardness CuNi2Si
Resistance to softening (Vickers hardness after heat treatment)
H Temper condition up to: 125ᵒC – fair
TM Temper condition up to: 150ᵒC – fair
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Type of corrosion |
Suitability |
Literature |
|---|---|---|
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Atmospheric |
Good, Excellent |
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Marine environment |
No data |
- |
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Stress crack |
Resistant |
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Hydrogen embrittlement |
No data |
- |
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Electrolytic |
No data |
- |
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Other |
|
- |
Stress relaxation CuNi2Si
Stress relaxation CuNi2Si
Stress relaxation degree for w=0,3Rm stress (1- annealed 900°C/3h and water quenched, 2- cold drown R.A. 96%, 3- age hardened 500°C/5h after solid solution).
Creep properties of CuNi2Si
|
Temper |
Testing temperature, °C |
Stress, MPa |
Duration, h |
Total extension, % |
Intercept, % |
Min. creep rate, %/1000h |
|---|---|---|---|---|---|---|
|
Precipitation hardened after cold working ~88% |
204 |
70 |
6000 |
0,16 |
0,018 |
0,0028 |
|
141 |
5830 |
0,192 |
0,030 |
0,0029 |
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|
211 |
5400 |
0,255 |
0,037 |
0,0033 |
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|
281 |
5760 |
0,385 |
0,045 |
0,0052 |
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|
352 |
5760 |
0,50 |
0,072 |
0,0049 |
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|
422 |
6000 |
0,78 |
0,18 |
0,027 |
Stress for rupture of CuNi2Si
|
Temper |
Testing temperature, °C |
Stress for rupture in time indicated, MPa | ||
|---|---|---|---|---|
|
10 h |
100 h |
1000 h | ||
|
Solution heat treated |
300 |
- |
146 |
107 |
|
450 |
- |
67 |
37 |
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Precipitation hardened |
200 |
- |
401 |
347 |
|
300 |
- |
134 |
104 |
|
|
450 |
- |
58 |
29 |
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Precipitation hardened after cold working 88%, wire |
204 |
584 |
569 |
548 |
|
260 |
555 |
478 |
387 |
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Precipitation hardened after cold working ~88% |
300 |
430 |
402 |
309 |
|
400 |
302 |
211 |
112 |
|
|
500 |
134 |
- |
- |
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Fatigue strength at room temperature CuNi2Si
Temper | Number of cycles, x106 | Tensile strength, MPa | Fatigue strength, MPa |
|---|---|---|---|
Solution heat treated and cold worked 35%, rod | >10 | 700a | 350 |
700b | 170 | ||
700c | 450 | ||
Precipitation hardened after cold working 37%, strip | 20 | 690 | 245 |
a-Reversed alternating tension test
b-Torsional test
c-Pulsating test
Impact strength at low temperature of CuNi2Si
| Temper | Testing temperature, °C | Impact strength |
|---|---|---|
| kg m/cm2 | ||
| Solution heat treated and cold worked ~35% - Rod | 20 | >13 |
| -60 | >15 | |
| Precipitation hardened – Rod | 22 | 19 |
| -78 | 18,3 | |
| -197 | 18,8 | |
| -253 | 20,0 | |
| -269 | - | |
| Precipitation hardened after cold working ~75% | 20 | 13 |
| -20 | 14,5 | |
| -70 | 15 | |
| -170 | 15 |
Strength vs. CuNi2Si alloy tension temperature
Elongation (A) and reduction of area (Z) vs. CuNi2Si alloy tension temperature
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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 | | ||
| Spot Weld | good | | ||
| Seam Weld | good | | ||
| Butt Weld | good | | ||
| Capacity for Being Cold Worked | good fair | | ||
| Capacity for Being Hot Formed | excellent | | ||
| Machinability Rating | 20-30 | | ||
Variation of hardness with ageing time at different processing conditions-spray formed.
(Note: (SF+ageing) - direct ageing of the spray formed alloy, (SF + CR + ageing) - ageing of the spray formed alloy after cold rolling to a 40% reduction in the original thickness, (SF+ST+CR+ageing) - ageing of spray formed alloy after solution treatment and cold rolling to 40% reduction in the original thickness. The solution treatment: 900°C for 1 and water quenching. Ageing treatments: 450°C) .
Variation of electrical conductivity with ageing time at different processing conditions-spray formed. Variation of hardness with ageing time at different processing conditions-spray formed. (Note: (SF+ageing) - direct ageing of the spray formed alloy, (SF + CR + ageing) - ageing of the spray formed alloy after cold rolling to a 40% reduction in the original thickness, (SF+ST+CR+ageing) - ageing of spray formed alloy after solution treatment and cold rolling to 40% reduction in the original thickness. The solution treatment: 900°C for 1 and water quenching.Ageing treatments: 450°C) .
Electrical conductivity in relation to the forgings artificial ageing time, for the temperatures range 450-550°C .
Hardness HRB in relation to the forgings artificial ageing time, for the temperatures range 450-550°C .
Curves of artificial ageing of forgings in different temperatures after the process of forming and supersaturation from the temperature of 900°C: a)-tensile strength, b)-yield point, c)-Rockwell hardness, d)-electrical conductivity .
Variation of thermal conductivity CuNi2Si with temperature
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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] |
| 1040-1060 | 1130-1200 | No data | 650-725 | 750-850 Comments: 60-15min. | 750-850 | 425-500 Comments: 5-1h (own research) | No data | 800-900 |
