Graphite Electrode

UHP 600 Graphite electrodeGraphite electrodes are the main heating element used in an electric arc furnace, a steelmaking process where scrap from old cars or appliances is melted to produce new steel.

Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as a binder, and are made by calcination, batching, kneading, pressing, roasting, impregnation, graphitization, and machining.

Graphite electrodes can be divided into RP graphite electrodes, HP graphite electrodes and UHP graphite electrodes according to their quality indicators.

Graphite electrode is a conductor that releases electric energy in the form of electric arc to heat and melt the charge in an electric arc furnace. It has the characteristics of low resistivity, good conductivity, low ash, compact and uniform structure, good oxidation resistance, and high mechanical strength.

ISO: 9001 certification
Graphite electrode usage guide
Graphite electrode prices consultation
Graphite Electrode SDS
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Advantages of Our Graphite Electrode

  • High output, with an annual output of 80,000 tons
  • Having vast inventory
  • Timely delivery; guarantee delivery date
  • Superior quality; solve customer problems in time, technical support
  • Strict consumption control
  • Low resistivity
  • High temperature strength
  • Good electrical conductivity
  • Low thermal expansion coefficient
  • Low ash
  • Good thermal conductivity and electrical conductivity
  • Dense and equal structure
  • Good oxidation resistance
  • High mechanical strength
  • Proper machining capability
  • Needle coke content accounts for 80%, raw materials imported from Japan and South Korea

Application of graphite electrode

  • Used in electric arc steelmaking furnace.Graphite electrode is mainly used in electric furnace steelmaking. Electric furnace steelmaking uses graphite electrodes to introduce current into the furnace. A strong current generates an arc discharge through the gas at the lower end of the electrode, and uses the heat generated by the arc to smelt.
  • Used in ore-heating furnaces.Graphite electrode ore-heating furnaces are mainly used to produce ferroalloys, pure silicon, yellow phosphorus, matte and calcium carbide, etc., which is characterized by electrical conductivity…
  • For resistance furnaces, graphitization furnaces for producing graphite products, melting furnaces for melting glass, and electric furnaces for producing silicon carbide are all resistance furnaces.
  • Used for processing a large number of graphite electrode blanks; also used for processing into various crucibles, graphite boats, hot die casting molds and heating elements for vacuum electric furnaces, etc…
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Schematic diagram of graphite electrode production and processing flow

Schematic diagram of graphite electrode production and processing flow
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Graphite Electrode Specifications

Item Unit Graphite Electrode
RH HP UHP
Φ300-Φ800mm Φ300-Φ800mm Φ300-Φ500mm Φ550-Φ800mm
Typical Value Typical Value Typical Value Typical Value
Resistivity Electrode uΩm 7.0-10.0 5.8-6.6 4.8-5.8 4.6-5.8
Nipple 4.0-4.5 3.5-4.0 3.5-4.0 3.5-4.0
Modulus of Rupture Electrode Mpa 8.0-10.0 10.0-13.0 10.0-14.0 10.0-14.0
Nipple 19.0-22.0 20.0-23.0 20.0-24.0 22.0-26.0
Young’s Modulus Electrode Gpa 7.0-9.3 8.0-12.0 9.0-13.0 10.0-14.0
Nipple 12.0-14.0 14.0.0-16.0 15.0-18.0 16.0-19.0
Bulk Density Electrode g/m³ 1.53-1.56 1.64-1.68 1.68-1.74 1.68-1.74
Nipple 1.70-1.74 1.75-1.80 1.78-1.82 1.78-1.84
CTE(100-600℃) Electrode 10-6/℃ 2.2-2.6 1.6-1.9 1.1-1.4 1.1-1.4
Nipple 2.0-2.5 1.1-1.4 0.9-1.2 0.9-1.2
Ash % 0.5 0.3 0.3 0.3

Physical Dimension of Electrodes 

Unit: mm

Nominal Diameter

Actual Diameter Nominal Length and Tolerance

Min

Min. CrustDiameter 1500 1800 2100 2400 2700
Standard Short Standard Short Standard Short Standard Short Standard Short
150 154 149 146 ±100 – 225 ±100 – 275
200 205 200 197
250 256 251 248 ±125 – 275
300 307 302 299
350 357 352 349 ±125 – 275
400 409 403 400
450 460 454 451 +200

-150

-300
500 511 505 502
550 562 556 553
600 613 607 604
650 663 657 654
700 714 708 705
750 765 759 756
800 816 810 807

Current Load and Current Density

Diameter RP HP UHP
mm Current Load (A) Current Density(A/cm³) Current Load (A) Current Density(A/cm³) Current Load(A)

Current Density(A/cm³)

200 5000-6900 15-21 5500-9000 18-25
225 6100-8600 15-21 6500-10000 18-25
250 7000-10000 14-20 8000-13000 18-25 8100-12200 20-30
300 10000-13000 14-18 13000-17400 17-24 15000-22000 20-30
350 13500-18000 14-18 17400-24000 17-24 20000-30000 20-30
400 18000-23500 14-18 21000-31000 16-24 25000-40000 19-30
450 22000-27000 13-17 25000-40000 15-24 32000-45000 19-27
500 25000-32000 13-16 30000-48000 15-24 38000-55000 18-27
550 32000-40000 13-16 37000-57000 15-23 42000-66000 17-26
600 38000-47000 13-16 44000-67000 15-23 49000-76000 17-26
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Storage of graphite electrodes

  • The electrodes and connectors should be placed on a wooden square, iron frame or clean concrete floor, and the electrodes should be damaged or stained with soil;do not pack the electrodes that are not in use temporarily.
  • Prevent dust and debris from falling on the joint threads or on the electrode end face and electrode hole threads.
  • Electrodes should be neatly stored in the warehouse, and the electrode stack end should be padded to prevent slipping. The stack height of the electrodes should generally not exceed two meters.
  • The stored electrodes should be protected from rain and moisture. Wet electrodes should be dried before use to avoid cracks and increased oxidation during steelmaking.
  • Do not store the electrode head near high temperature to prevent the street plug from melting.

Factors affecting graphite electrode consumption

  • Loading amount and feeding method
  • Adding time and power-off time
  • Smeting cycle
  • Abandonment of emissions
  • Electrode adjustment
  • High current
  • Large amount of slag
  • Improper oxygen blowing
  • Electrode operation and coupling