Iron Chrome Aluminium Resistance Wires

Main characteristics of Fe-Cr-Al high resistance heating alloys

 

Alloy Nomenclature Performance

1Cr13Al4

0Cr25Al5

0Cr21Al6

0Cr23Al5

0Cr21Al4

0Cr21Al6Nb

0Cr27Al7Mo2

Main Chemical composition

Cr

12.0-15.0

23.0-26.0

19.0-22.0

20.5-23.5

18.0-21.0

21.0-23.0

26.5-27.8

Al

4.0-6.0

4.5-6.5

5.0-7.0

4.2-5.3

3.0-4.2

5.0-7.0

6.0-7.0

Re

opportune

opportune

opportune

opportune

opportune

opportune

opportune

Fe

Rest

Rest

Rest

Rest

Rest

Rest

Rest

 

 

 

 

 

 

Nb0.5

Mo1.8-2.2

Max. continuous service temp. of element

950

1250

1250

1250

1100

1350

1400

Resistivity at 20ºC (μΩ·m)

1.25

1.42

1.42

1.35

1.23

1.45

1.53

Density (g/cm3)

7.40

7.10

7.16

7.25

7.35

7.10

7.10

Thermal conductivity(KJ/m.h.ºC)

52.7

46.1

63.2

60.2

46.9

46.1

45.2

Coefficient of lines expansion(α×10-6/ºC)

15.4

16.0

14.7

15.0

13.5

16.0

16.0

Melting point (approx.) (ºC)

1450

1500

1500

1500

1500

1510

1520

Tensile strength (N/mm2)

580-680

630-780

630-780

630-780

600-700

650-800

680-830

Elongation rate (%)

>16

>12

>12

>12

>12

>12

>10

Variation of area (%)

65-75

60-75

65-75

65-75

65-75

65-75

65-75

Bending frequency (F/R)

>5

>5

>5

>5

>5

>5

>5

Hardness (H.B.)

200-260

200-260

200-260

200-260

200-260

200-260

200-260

continuous service time (Hours/ ºC)

--

≥80/1300

≥80/1300

≥80/1300

≥80/1250

≥50/1350

≥50/1350

Micrographic structure

Ferrite

Ferrite

Ferrite

Ferrite

Ferrite

Ferrite

Ferrite

Magnetic properties

Magnetic

Magnetic

Magnetic

Magnetic

Magnetic

Magnetic

Magnetic

 

Fe-Cr-Al alloys with the diameters and characteristics

 

Dia. (mm)

Cross sectional area(mm2)

0Cr23Al5

Resistivity μΩ • m 1.35±0.06

Resistance per meter (20ºC Ω/m)

Length per kg (m/kg)

Weight per Meter(kg/m)

0.10

0.0078

173.1

17683

0.0000566

0.12

0.0113

119.5

12206

0.0000819

0.15

0.0177

76.4

7793

0.000128

0.17

0.0227

59.5

6076

0.000165

0.19

0.0284

47.5

4854

0.00206

0.21

0.0346

35.5

3986

0.000276

0.25

0.0491

27.5

2809

0.000356

0.27

0.0573

21.9

2407

0.000447

0.29

0.0661

19.1

2087

0.000513

0.31

0.0755

16.8

1827

0.000583

0.35

0.0962

14.0

1434

0.000697

0.40

0.1257

10.7

1097

0.000911

0.45

0.1590

8.49

867

0.00115

0.50

0.1963

6.88

703

0.00142

0.60

0.283

4.77

496

0.00205

0.70

0.385

3.51

358

0.00279

0.80

0.503

2.69

274

0.00365

0.90

0.636

2.12

217

0.00461

1.00

0.785

1.72

176

0.00569

1.20

1.131

1.194

122

0.00820

1.40

1.539

0.877

89.6

0.01116

1.60

3.01

0.672

68.6

0.01457

1.80

2.54

0.532

54.3

0.01842

2.00

3.14

0.430

43.9

0.02277

2.20

3.80

0.355

36.3

0.02755

2.50

4.91

0.275

28.1

0.03849

3.00

7.07

0.191

19.5

0.05126

3.50

9.62

0.140

14.3

0.06975

4.00

12.57

0.107

11.0

0.09113

4.50

15.90

0.0849

8.67

0.1153

5.00

19.63

0.0688

7.03

0.1423

5.50

23.80

0.0568

5.80

0.1726

6.00

28.30

0.0477

4.88

0.2052

6.50

33.20

0.0407

4.15

0.2407

7.00

38.50

0.0351

3.58

0.2791