Electro-heating wire & strip made from Nicr Alloy or FeCr Alloy

 

 

   These alloys are suitable for usage of hi-temperature, which have good tensile strength and are rarely softened even under hi-temperature. Still they are not brittle, they are endurable to gas, corrosion and oxidation. There is high dense and coherent oxidation film covering its surface, the film can endure tremendous temperature change, will never be peeled off.

   Besides, comparing with resistance wire made from other material, because of the lighter weight, and larger in resistivity resistors adopting this wire will be very light in weight.

 

Chemical Composition

Type

Chemical Composition (%)

Ni

Cr

Al

C

Si

Mn

Fe

Cr20Ni80

above 77

19~21

 

below 0.15

0.75~1.5

below 2.5

below 1

Cr15Ni60

above 57

15~18

 

below 0.15

0.75~1.5

below 1.5

rest

0Cr25Al5

 

23~26

4~6

below 0.10

below 1.5

below 1.0

rest

0Cr19Al3

 

17~21

2~4

below 0.10

below 1.5

below 1.0

rest

 

 

Physical properties

Type

Resistivity

(mΩ·m)

23

Max work

temperature

Specific gravity

7.15g/cm3

Specific heat

cal/g

Melting point

Tensile strength

kg/mm2

Elongation

%

Cr20Ni80

1.08±0.05

1150

8.41

0.106

1400

65~80

25~35

Cr15Ni60

1.12±0.05

1000

8.25

0.112

1390

65~80

25~35

0Cr25Al5

1.42±0.06

1250

7.20

0.201

1510

65~85

7~18

0Cr19Al3

1.23±0.06

1100

7.35

0.199

1500

65~85

10~20

 

 

Data of useful life

Type

Test Methods

Times

Cr20Ni80

Method I 1200

above   500

Cr15Ni60

Method I 1200

above   300

0Cr25Al5

Method U 1300

above   250

0Cr19Al3

Method U 1300

above   100

 

 

 


Property Sheet for Wire Cr20Ni80

Wire Dia

Sectional area

mm2

Resistance

Ω/m

Length

m/kg

Current(Ampere)Value when a single wire is horizontally hookedup in open air

B.S

mm

200

300

400

500

600

700

800

0

1

2

3

4

8.0

7.0

6.5

6.0

5.5

50.27

38.48

33.18

28.27

23.76

0.0215

0.0281

0.0326

0.0382

0.0455

2.34

3.06

3.54

4.16

4.95

123.3

100.0

90.8

80.5

71.0

167.2

137.0

123.6

109.5

96.8

204.5

167.2

150.8

133.0

117.2

243.0

198.3

178.7

158.0

138.6

277.0

226.8

203.5

179.0

158.0

309.0

251.5

227.2

200.0

176.4

345.2

281.3

354.0

223.5

197.0

 

 

 

 

 

 

 

 

 

 

 

 

4

5

6

7

8

5.0

4.5

4.0

3.5

3.2

19.64