Graphite Electrode

Graphite Electrode

Garaphite electrode is a major conduction material used in the Electric smelting industry, which has the properties of superior electric conductivity, thermal conductivity, high mechanical strength, oxidation and corrosion resistance in high...

Garaphite electrode is a major conduction material used in the Electric smelting industry, which has the properties of superior electric conductivity, thermal conductivity, high mechanical strength, oxidation and corrosion resistance in high temperature. Graphite electrode is typically used in EAF (for smelting steel), submerged-arc furnace ( for producing ferrodalloy, pure silicon, phosphor matte, calcium carbide, etc. and electric resistance furnace, such as graphitization furnace producing graphite electrodes glass-melting furnace, electric furnaces producing carborundum, etc.

Graphite electrodes are classified into RP,HD,HP and UHP.

Physico- chemical Specifications of HP Graphite Electrode:

Items

Classification

Unit

                                            Diameter ( mm )  HP Graphite Electrode

                    HP electrodes

         Type       of HP

Φ200~ φ 400

Typical

Value

Φ450- φ500

Typical

Value

Φ550- φ700

Typical

Value

Φ350- φ400

Typical

Value

Φ450- φ500

Typical

Value

 Specific

Resistance

Pole

џΩ • m

7.0

6.0

7.0

6.0

7.0

6.0

6.5

5.8

6.5

5.8

Nipple

6.0

5.2

6.5

5.2

5.8

5.2

5.5

4.8

5.5

4.8

Bending

Strength

Pole

MPa

10.5

 

10.0

 

10.0

 

10.0

 

10.0

 

Nipple

16.0

 

16.0

 

16.0

 

18.0

 

18.0

 

Young’s

Modulus

Pole

GPa

12.0

 

12.0

 

12.0

 

14.0

 

14.0

 

Nipple

16.0

 

16.0

 

16.0

 

18.0

 

18.0

 

Bulk

Density

Pole

g/cm3

1.62

1.65

1.62

1.64

1.62

1.64

1.63

1.66

1.63

1.66

Nipple

1.70

1.73

1.70

1.73

1.70

1.75

1.72

1.75

1.72

1.75

CTE

>(100-600°C)

Pole

x 10-6/°C

2.4

 

2.4

 

2.4

 

2.2

 

2.2

 

Nipple

2.2

 

2.2

 

2.2

 

1.6

 

1.6

 

Ash Content

 

%

0.3

 

0.3

 

0.3

 

0.3

 

0.3

 
 
   

Physico- chemical Specifications of HD Graphite Electrode:

 

       Items

 

  Unit

Diameter ( mm )  HD Graphite Electrode

 

φ75~φ200

Φ250~φ350

Typical

Value

Φ400~φ500

Typical

Value

Grade

A

Grade

B

Grade

A

Grade

B

6.5

Grade

A

Grade

B

Specific

Resistance

Pole

џΩ • m

   8.0

   9.0

  8.0

  9.0

6.0

8.0

9.0

6.5

Nipple

7.5

7.5

 

7.5

6.0

Bending

Strength

Pole

MPa

10.0

9.0

 

8.0

 

Nipple

15.0

15.0

 

15.0

 

Young’s

Modulus

Pole

GPa

12.0

12.0

 

12.0

 

Nipple

14.0

14.0

 

14.0

 

Bulk

Density

Pole

g/cm3

1.58

1.58

1.62

1.58

1.62

Nipple

1.68

1.68

1.70

1.68

1.70

CTE

 

(100~600°C

Pole

x 10-6/°C

2.7

2.7

 

2.7

 

Nipple

2.5

2.5

 

2.5

 

Ash Content

 

  %

0.3

0.3

 

0.3

 

Physico- chemical Specifications of UHP Graphite Electrode:

      Items

  

Classi-fication

  

Unit

  

Diameter (mm) UHP Graphite Electrode
     

Φ300-Φ400

Typical

 value

Φ450-Φ500

Typical

 value

Φ550-Φ600

Typical

 value

Φ700

Typical

 value

Specific

Resistance

  

Pole

  

џΩ • m

  

6.2

5.2

6.3

5.2

6.3

5.2

6.3

5.2
 

Nipple

    

5.0

4.2

5.0

4.2

4.5

4.2

4.5

4.0

Bending

Strength

  

Pole

  

MPa

  

10.5

 

10.5

 

11.0

 

11.0

 
 

Nipple

    

18.0

 

18.0

 

20.0

 

2.0

 

Young’s

Moudulus

  

Pole

  

Gpa

  

14.0

 

14.0

 

14.0

 

14.0

 
 

Nipple

    

18.0

 

18.0

 

22.0

 

22.0

 

Bulk

Density

  

Pole

  

G/cm3

  

1.66

1.70

1.66

1.70

1.66

1.72

1.66

1.72
 

Nipple

    

1.73

1.76

1.74

1.76

1.75

1.78

1.78

1.78

CTE

(100-600°C)

  

Pole

  

x 10-6/°C

  

1.5

 

1.5

 

1.4

 

1.4

 
 

Nipple

    

1.4

 

1.4

 

1.2

 

1.2

 

Ash Content

  

 

  

 

   %

  

 

0.3

 

 

0.3

 

 

0.5

 

 

0.5

 

Thông số kĩ thuât RP:

      Nominal

      Diameter

        ( mm )

 

                                    Operation Current (Ampere )

 

RP Electrode

HD Electrode

HP Electrode

Type  II  HP

UHP Electrode

Φ   75

1000-1400

1300-200

-

-

-

Φ  100

1500-2400

1800-3000

-

-

-

Φ  130

2200-3400

2800-4200

-

-

-

Φ  150

3000-4500

4000-5000

-

-

-

Φ  200

5000-6900

48009000

5500-9000

-

-

Φ  250

7000-10000

8000-12000

8000-13000

-

-

Φ  300

10000-13000

11000-16000

13000-17400

-

15000-22000

Φ  350

13500-18000

15000-22000

17400-24000

19000-28000

20000-30000

Φ  400

18000-23500

20000-28000

21000-31000

23000-35000

25000-40000

Φ  450

22000-27000

2400034000

25000-40000

30000-42000

32000-45000

Φ  500

25000-32000

28000-42000

30000-48000

35000-50000

38000-55000

Φ  550

28000-36000

-

34000-55000

-

45000-65000

Φ  600

 

35000-41000

-

38000-61000

-

50000-75000

Φ700

39000-48000

-

45000-75000

--

60000-100000

Note: On EAF, the current is suggested to be reduced by 10% ; On LF, it might be increased by 10%

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