Alloy properties:

UM70310 is a copper-nickel-silicon alloy strip with the highest tensile strength, excellent bendability and good electrical conductivity. It has good anti-relaxation properties and increases strength through aging hardening. It can partially replace beryllium copper and is widely used in automotive electronic connectors, sensors, relays and controllers. It is also used to make high resistance and thermocouple alloys, suitable for conductive and thermal conductive components in various electronic devices.

Chemical composition:

Copper (Cu)

Nickel (Ni)

Silicon (Si)

Tin (Sn)

Zinc (Zn)

other

margin

1.0-4.0%

0.008-1.00%

max.1.00

max.2.00

max.0.5

Physical properties:

density

g/ ^cm3

8.85

Thermal conductivity

Watt/(m·K)

185

Electrical conductivity

IACS（%)

25/23

Coefficient of thermal expansion

10 ^-6 K

43/40

Elastic modulus

GPa

132

Mechanical properties:

Bending properties

state

Strength level

Tensile strength MPa

Yield strength MPa

Elongation %(A50)

Vickers hardness HV

90°R/T(Thickness ≤ 0.5mm)

180°R/T(Thickness ≤ 0.5mm)

Good way

Bad way

Good way

Bad way

Cold work hardening

R360

360-430

250

14

16

100-130

0

0

0

0.5

R410

410-470

360

9

12

125-155

0

0.5

0.5

1

R460

460-520

410

7

10

135-165

0.5

1

1.5

3

R520

520-580

460

5

8

145-175

1

2

2.5

3.5

R580

580-650

520

4

6

170-200

1

2.5

3

5

Precipitation Strengthening

R620

620-720

540

16

180-240

0

0

1

1.5

R660

660-750

590

10

200-250

1

1

1.5

2

R750

750-830

680

8

210-260

2

2

3

4

R800

≥800

750

5

≥210

3

3

4

5