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GRAPHITE ELECTRODE
 
GRAPHITE ELECTRODE  |  SIZES & ALLOWABLE TOLERANCE  |  QUESTIONNAIRE OF FURNACE  
   GRAPHITE ELECTRODE
   Technical Properties of Graphite Electrode
  Items   Unit  Diameters (mm) & Grades
RP grade HP grade SHP grade UHP grade
75-225 250-600 150-500 250-500 250-550
Specific Resistance  max. Micron.ohm.m 8.0 8.5 6.8 6.0 5.5
Flexural Strength    min. MPa 9.5 7.0 10.0 10.5 11.0
Young's Modulus    max. GPa 9.3 9.3 12.0 13.0 13.0
Bulk Density        min. g/cm3 1.56 1.54 1.63 1.65 1.68
C.T.E.(100-600 ºC)  max.   10-6/ ºC 2.9 2.9 2.4 2.0 1.5
Ash Content        max. % 0.5 0.5 0.3 0.3 0.3
   Technical Properties of Nipple
Items Unit Grades
RP grade HP grade SHP grade UHP grade
Specific Resistance   Max. Micron.ohm.m 6.5 5.5 4.8 4.5
Flexural Strength     Min. MPa 14.0 16.0 19.0 20.0
Young's Modulus     Max. GPa 14.0 16.0 18.0 18.0
Bulk Density         Min. g/cm3 1.68 1.74 1.76 1.78
C.T.E.(100 - 600 ºC)  Max.   10-6/ ºC 2.4 2.0 1.5 1.4
Ash Content         Max. % 0.3 0.2 0.2 0.2
   Suggested Currents applied to Graphite Electrode
Dia. (mm) Carrying Capacity (A)
RP grade HP grade SHP grade UHP grade
75 1000 - 1400 1000 - 2000 / /
100 1500 - 2400 2000 - 3000 / /
130 2200 - 3400 3000 - 4000 / /
150 3000 - 4500 4000 - 5400 / /
175 4000 - 5500 4800 - 6800 / /
200 5000 - 7000 5500 - 10000 / /
225 6000 - 8200 7000 - 11000 / /
250 7000 - 10500 8000 - 13500 9000 - 14800 9200 ? 15300
300 10000 ? 14000 13000 ? 18000 15000 - 21000 16000 ? 23000
350 14000 ? 19000 17400 ? 25000 20000 - 28800 22000 - 32000
400 18000 ? 24500 21500 ? 33000 25000 - 38000 26000 - 42000
450 22000 ? 28000 25000 ? 41000 31000 - 44000 33000 - 46000
500 25000 - 33000 30000 - 49000 35000 - 52000 41000 - 55000
550 32000 - 40000 37000 - 57000 42000 - 58500 48000 - 60000
600 38000 - 47000 44000 - 67000 48000 - 69500 52000 - 72000
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