سبيكة النيكل الكروم لتدفئة المقاومة الكهربائية

Model

Ni80Cr20

Ni70Cr30

Ni60Cr15

Ni35Cr20

Ni30Cr20

Properties

Main chemical composition (%)

Ni

-

-

55.0~61.0

34.0~37.0

30.0~34.0

Cr

20.0~23.0

28.0~31.0

15.0~18.0

18.0~21.0

18.0~21.0

Fe

≤1.0

≤1.0

-

-

-

Maximum service temperature (℃)

1200

1250

1150

1100

1100

Average melting point (℃)

1400

1380

1390

1390

1390

Density (g/cm³)

8.40

8.10

8.20

7.90

7.90

Resistivity (μΩ.m,20 ℃)

1.09

1.18

1.12

1.0

1.04

Elongation (%)

≥20

≥20

≥20

≥20

≥20

Specific heat (J/g. ℃)

0.440

0.461

0.494

0.500

0.500

Heat conductivity coefficient (KJ/m.h.℃)

60.3

45.2

45.2

43.8

43.8

Linear expansion coefficient (α×10-6/℃)

18.0

17.0

17.0

19.0

19.0

Microscopic structure

Austenitic

Austenitic

Austenitic

Austenitic

Austenitic

Magnetism

Non

Non

Non

Non

Non