1.FeCrAl alloys: 

 

As these alloys possess the characteristics of high resistance, low temperature coefficient of electric resistance, high operating temperature, good corrosion resistance in high temperature, especially in the atmosphere containing S and/or sulfides, as well as the lower price, they are widely used in industrial electric furnaces, household electrical applications and far infrared ray device .

 

Types

1Cr13Al4

0Cr21Al4

0Cr25Al5

0Cr21Al6

0Cr21Al6Nb

0Cr27Al7Mo2

 

Main chemical composition (%)

Cr

12-15

17-21

23-26

19-22

21-23

26.5-27.8

Al

4-6

2-4

4.5-6.5

5-7

5-7

6-7

Fe

rest

rest

rest

rest

rest

rest

RE

opportune amount

opportune amount

opportune amount

opportune amount

opportune amount

opportune amount

Mo

-

-

-

-

-

1.8-2.2

Nb

-

-

-

-

0.5

-

Max continuous service Temp. of element (℃)

950

1100

1250

1250

1350

1400

Density (g/cm3)

7.40

7.35

7.1

7.1

7.1

7.1

Resistivity(Ω.mm2/m)

1.25

1.23

1.42

1.42

1.45

1.53

Temp. coeff. of resistance (10^-5/℃)

15

5

5

5

5

-1

Melting point(℃)

1450

1500

1500

1500

1510

1520

Tensile strength(MPa)

588-735

637-784

637-784

637-784

637-784

686-784

Elongation %

>14

>14

>12

>12

>12

>12

Shrinkage %

65-75

65-75

65-75

65-75

65-75

65-75

Bending times

>5

>5

>5

>5

>5

>5

Hardness

200-260

200-260

200-260

200-260

200-260

200-260

Micrographic structure

F

F

F

F

F

F

Magnetic property

magnetic

magnetic

magnetic

magnetic

magnetic

magnetic

 

2.NiCr Alloys:

 

These wires possess high electrical resistance, corrosion resistance, and high strength in high temperature, good formability and weldability. It can be used for making heating elements and resistors in metallurgical industry, household electrical appliances and machine building industry.

 

Main properties :

 

Types

Ni80Cr20

Ni60Cr15

Ni30Cr20

Main chemical composition (%)

Cr

15-18

20-23

20-23

Ni

55-61

rest

30-33

Fe

rest

<1.0

rest

Max continuous temp. of element (℃)

1150

1100

1100

Density (g/cm3)

8.4

8.2

7.9

Melting point appr.(℃)

1400

1390

1390

Elongation (%)

>20

>20

>20

Resistivity at 20 ℃ (Ω.mm2/m)

1.09-1.14

1.12-1.15

1.04

Micrographic structure

A

A

A

 

Size of cold-rolling strips

Thickness mm

Width mm

0.05-0.5

1.0-5.0

0.5-0.7

5.0-8

0.8-0.9

6-11

1.0-1.5

6-40

1.6-2.5

15-40

 

Diameter tolerance of wires

 

Diameter mm

Tolerance mm

Cold-drawing wires

0.1-0.3

+/-0.010

>0.3-0.5

+/-0.015

>0.5-1.0

+0.020 –0.03

>1.03-3.0

+/-0.030

>3.0-5.5

+/-0.040

>5.5-6.0

+/-0.050

Hot-rolling coils

>7.0-12.0

+0.30 –0.5

 

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