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CuNi2Si
EN: CW111C
UNS: C70260, C64700
MANUFACTURERS LIST
CuNi2Si are a precipitation hardening copper alloys. It has high mechanical and electrical properties. In the artificial aged temper, the alloy exhibits high strength and hardness, good wear resistance and fatigue resistance, high corrosion resistance, high electrical and thermal conductivity. This alloy has excellent hot forming. Cold working before precipitation hardening can further improve strength and hardness.
Applications

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:

Components for the electrical industry, stamped parts, connectors, relay springs.
Chemical composition

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

Mechanical properties

Mechanical properties
UTS
[MPa]
YS
[MPa]
Elongation
[%]
HardnessYoung’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

 

R580

580-650

470

14

170-210 HV

R620

620-720

540

13

180-220 HV

R680

680-780

620

10

200-240 HV

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

Precipitation hardened sheet, strip

580

520

14 (L0=5,65(S0)0,5)

170 HB, 180 HV

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

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

Solution heat treated –wire

300

120

30 (A100)

-

Solution heat treated and cold drown to typical temper–wire

550

520

-

-

Precipitation hardened after cold drowing to typical temper wire

750

670

7 (A100)

-

Solution heat treated –tube

300

120

35 (L0=5,65(S0)0,5)

70 HB, 73 HV

Solution heat treated and cold drown to typical temper–tube

450

380

10 (L0=5,65(S0)0,5)

125 HB, 130 HV

Precipitation hardened tube

550

450

15 (L0=5,65(S0)0,5)

170 HB, 180 HV

Precipitation hardened after cold drowing to typical temper tube

720

630

10 (L0=5,65(S0)0,5)

200 HB, 210 HV

Participation hardened - forgings

580

500

12 (L0=5,65(S0)0,5)

160 HB, 170 HV

R430, Strip

430-520

330

10 (A)

 

 EN 1654 (1997)

R450, Strip

450-600

360

3 (A)

 

R510, Strip

510-600

450

10 (A)

 

R600, Strip

min. 600

550

8 (A)

 

R550, Wire

min. 550

430

15 (L0=5,65(S0)0,5)

 

EN 12166 (2011)

R600, Wire

Min. 600

520

10 (L0=5,65(S0)0,5)

 

R640, Wire

Min. 640

590

8 (L0=5,65(S0)0,5)

 

superseturation

 

 

 

70,5

 

 

 

superseturation+ageing

 

 

 

183,5

superseturation+ageing+SPD (RCS)

 

 

 

223,7

superseturation+ageing+SPD (RCS)+ageing

 

 

 

208,3

R370

370-420

≤240

≥18 (A50)

100-140 HV

 

 

 

 

R430

430-520

≥320

≥13 (A50)

125-160 HV

R450

450-560

≥360

≥8 (A50)

130-180 HV

R510

510-600

≥450

≥5

150-180 HV

R640

≥640

≥550

≥3

≥180

R260

min. 260

min. 60

min. 30

65-100 HV

 

 

 

R460

min. 460

min. 300

min. 12

150-190 HV

R380

min. 380

min. 260

min. 6

130-170 HV

R600

min. 600

min. 480

min. 8

min. 190 HV

R360 (H100)

360-430

250

>12

100-130 HV

 

                                                                                                                         

 

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)

Precipitation hardened – Rod

22

790

738

15 (L0=4,52(S0)0,5)

-78

840

779

18 (L0=4,52(S0)0,5)

-197

870

802

24 (L0=4,52(S0)0,5)

-253

940

832

33 (L0=4,52(S0)0,5)

-269

955

842

31 (L0=4,52(S0)0,5)

Precipitation hardened after cold working ~75%

20

800

680

9 (L0=5,65(S0)0,5)

-20

800

680

10 (L0=4,52(S0)0,5)

-70

820

690

11,5 (L0=4,52(S0)0,5)

-170

860

720

18,5 (L0=4,52(S0)0,5)

 

 

Mechanical properties at elevated temperature of CuNi2Si

Temper

Testing temperature,
°C

Tensile strength, MPa

Yield strength 0,5% ext. under load, MPa

Elongation, % on 2 in.

Solution heat treated

20

265

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200

250

-

-

300

245

-

-

450

190

-

-

600

185

-

-

Precipitation hardened

20

605

590

-

200

565

550

-

300

500

490

-

450

355

345

-

600

240

233

-

Precipitation hardened after cold working 75%

20

740

-

-

200

690

635

11,0

300

645

-

7,5

400

570

555

4,5

500

440

412

1,5

600

235

227

4,5

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

Exploitation properties

Resistance to softening (Vickers hardness after heat treatment)

H Temper condition up to: 125ᵒC – fair

TM Temper condition up to: 150ᵒC – fair

NO DATA AVAILABLE

Type of corrosion

Suitability

Literature

Atmospheric

Good, Excellent

Marine environment

No data

 -

Stress crack

Resistant

Hydrogen embrittlement

No data

 -

Electrolytic

No data

 -

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

211

5400

0,255

0,037

0,0033

281

5760

0,385

0,045

0,0052

352

5760

0,50

0,072

0,0049

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

Precipitation hardened

200

-

401

347

300

-

134

104

450

-

58

29

Precipitation hardened after cold working 88%, wire

204

584

569

548

260

555

478

387

Precipitation hardened after cold working ~88%

300

430

402

309

400

302

211

112

500

134

-

-

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

TemperTesting 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

Fabrication properties

Fabrication properties
Value Literature Comments
Solderinggood


Brazinggood


Hot dip tinninggood


Electrolytic tinninggood


Electrolytic silveringgood


Electrolytic nickel coatinggood


Laser weldingnot recommended


Oxyacetylene Weldinggood


Gas Shielded Arc Weldinggood


Coated Metal Arc Weldingfair


Spot Weldgood


Seam Weldgood


Butt Weldgood


Capacity for Being Cold Workedgood
fair




Capacity for Being Hot Formedexcellent


Machinability Rating20-30


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

Technological properties

Technological properties
Melting temperature
[°C]
Casting temperature
[°C]
CastabilityAnnealling 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
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