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CuNi3Si
EN: CW112C
UNS: C70250, C70320
MANUFACTURERS LIST
KM Europa Metal AG
CuNi3Si(CuNi3Si)
Wieland-Werke AG
CuNi3Si (K55)
CuNi3Si is an age-hardening copper alloy. It has high mechanical properties, high electrical and thermal conductivity, good corrosion resistance, good fatigue strength and thermal resistance, good spring properties.
Applications

Connectors, leadframe, electrical equipment. CuNi3Si alloy con also be used for current-carrying formed parts and contact springs. Literature:

Electrical industry components, stamped parts, connectors, relay springs, semiconductor components.
Chemical composition

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

Mechanical properties

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

Bars, squares hexagonals; solution heat treated, strain-hardened

610

550

8

180 HB

 

Bars, squares hexagonals; solution heat treated, strain-hardened, artificially aged;

830

780

10

220 HB

 

Flats; solution heat treated, artificially aged

690

540

8

200

 

R620

620-760

500

10 (A50)

180-240 HV

40

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

Rod 10-30mm

650

590

10

195 HB

 

 

 

 

Rod 30-50mm

650

500

10

195 HB

 

Rod >50

590

440

10

190 HB

 

Electrical conductivity vs. temper

Exploitation properties

Resistance to softening of CuNi3Si

 

Softening resistance of CuNi3Si for different temper

NO DATA AVAILABLE

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 175C – fair

Stress relaxation of CuNi3Si

 

Stress relaxation of CuNi3Si at different temperature and temper

NO DATA AVAILABLE

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 .

NO DATA AVAILABLE
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


Resistance weldingfair


Capacity for Being Cold Workedgood


Capacity for Being Hot Formedexcellent


Forgeability Rating40


Machinability Rating30


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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