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Graphite Electrodes HP

Graphite electrode is usually used as conductor of electric arc furnace, electric arc generated between graphite electrode and bottom electrode can heat and melt furnace material. According to the rate power, graphite electrodes can be divided into regular power (RP) graphite electrode, high power (HP) graphite electrode, ultra high power (UHP) graphite electrode.


The main raw material of graphite electrode is petrol coke, in regular power graphite electrode, a little amount of pitch coke can be added into the raw material. Both petrol coke and pitch coke should contain no more than 0.5% of sulfur. During producing HP graphite electrode and UHP graphite electrode, needle shape coke should be added into raw material. Petrol coke is the main material for the production of aluminum industry graphite anode, and its sulfur content should not exceed 1.5%~2%.

hp graphite electrode2

The Advantages of Graphite Electrode

It is the best electrode material for electric arc furnace steelmaking.
High sublimation point, excellent electric conductivity, high mechanical strength.
Produces CO and CO2 gases when oxidized, won’t contaminate steel.
The density can be adjusted to obtain the best thermal shock resistance.
Low price, easy to process, is the ideal industrial material.

Physical & Chemical Properties of HP Graphite Electrodes

Items Classification Unit Nominal Diameter (mm)
HP Graphite Electrode
200-400 450-500 550-600
Resistivity Electrode μΩm 7 7.5 7.5
Nipple 6.3 6.3 6.3
Bending Strength Electrode Mpa 10.5 10 8.5
Nipple 17 17 17
Young’s Modulus Electrode Gpa 14 14 14
Nipple 16 16 16
Bulk Density Electrode g/cm3 1.6 1.6 1.6
Nipple 1.72 1.72 1.72
CTE(100℃-600℃) Electrode ×10-6/℃ 2.4 2.4 2.4
Nipple 2.2 2.2 2.2
Ash Content Electrode % 0.5 0.5 0.5
Nipple

Graphite Electrode HP Current Capacity

Nominal diameter Permissible current power The current density (A / cm2)
Millimeter (mm) Inch (inch)
300 12 10000-13000 17-24
350 14 13500-18000 17-24
400 16 18000-23500 16-24
450 18 22000-27000 16-24
500 20 25000-32000 15-24
600 24 30000-36000 14-24

The Length & Diameter & Permissible Deviation of Graphite Electrode HP

Diameter Length
Nominal diameter Actual diameter Nominal length tolerance
Millimeters (mm) Inch (inch) Max. (Max.) Min (min) mm Length the maximum
300 12 307 302 1600 1800 ± 100 -100 -275
350 14 357 352
400 16 409 403
450 18 460 454
500 20 511 505 1600/1800/2000/2200
1800/2000/2200
1800/2000/2200/2400
1800/2000/2200
1800/2000/2200
± 100 -100 -275

Application of HP Graphite Electrode

The main application of HP graphite electrode is electric furnace steelmaking mill, which consumes about 70~80% of graphite electrode. HP graphite electrode are suitable for EAF furnaces with 18~25A/cm2 current intensity. Meanwhile, HP graphite electrode is also used in ore electric furnaces which are used for making industrial silicon and yellow phosphorous. HP graphite electrodes are also used in resistances such as graphitization furnace for producing graphite products, glass melting furnace and electric furnace for producing silicon carbide.

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