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Graphite electrode is a major conduction material used in the electric smelting industry, with superior electric conductivity, thermal conductivity, high strength, oxidation and corrosion resistance in high temperature. Graphite electrode is typically used in EAF for smelting steel, submerged-arc furnace for producing ferroalloy, pure silicon, phosphor, matte, calcium carbide, and electric resistance furnace, such as graphitization furnace producing graphite electrodes, glass-melting furnace, electric furnaces producing carborundum. 

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

Items

Unit

Nominal Diameter (mm)

RP

HP

UHP

75~150

200~300

Above 350

Below 400

Above 450

Specific Resistance

Electrode

μΩm

8.5 max

8.5 max

8.5 max

6.5 max

6.5 max

5.8 max

Nipple

7.0 max

6.5 max

6.5 max

5.5 max

5.5 max

4.5 max

Flexural Strength

Electrode

MPa

9.8 min

8.5 min

7.0 min

10.5 min

9.8 min

14.0 min

Nipple

13.0 min

15.0 min

15.0 min

18.0 min

18.0 min

20.0 min

Youngs Modulus

Electrode

GPa

9.3 max

9.3 max

9.3 max

12.0 max

12.0 max

14.0 max

Nipple

14.0 max

14.0 max

14.0 max

16.0 max

16.0 max

18.0 max

Bulk Density

Electrode

g/cm3

1.58 min

1.53 min

1.52 min

1.65 min

1.62 min

1.68 min

Nipple

1.63 min

1.70 min

1.70 min

1.73 min

1.73 min

1.77 min

C.T.E.(100~600℃)

Electrode

1 x 10-6/℃

2.9 max

2.9 max

2.9 max

2.4 max

2.4 max

1.5 max

Nipple

2.7 max

2.8 max

2.8 max

2.2 max

2.2 max

1.4 max

Ash

%

0.5 max

0.5 max

0.5 max

0.3 max

0.3 max

0.2 max