Graphite Electrodes

1.DIAMETERS AVAILABLE: DIAMETER FROM 100MM TO 1050MM.
FOR RP GRADE, THE DIA IS USUALLY 100 -1060MM.
FOR RPI GRADE, THE DIA IS USUALLY 200 -650MM.
FOR HP GRADE, THE DIA IS USUALLY 300-650MM.
FOR SHP GRADE, THE DIA IS USUALLY FROM 400-650MM.
FOR SHP GRADE, THE DIA IS USUALLY FROM 400-650MM.

2. STANDARD GRADES – PROPERTIES: RP, RPI, HP,SHP & UHP. (GE: ELECTRODES, GN: NIPPLES)
2.1). RP:
RESISTIVITY (UOM ): 8.0 FOR GE, 6.5 FOR GN
BENDING STRENGTH (MPA ): 9.8 FOR GE, 13 FOR GN
BULK DENSITY(G/CM3 ): 1.58 FOR GE, 1.66 FOR GN
C.T.E.(100 -600 C, 10 -6/C ): 2.9 FOR GE, 2.7 FOR GN
ASH: 0.4% FOR GE, 0.2% FOR GN
2.2). RPI:
RESISTIVITY (UOM ): 7.5 FOR GE, 6.2 FOR GN
BENDING STRENGTH (MPA ): 10.0 FOR GE, 14 FOR GN
BULK DENSITY(G/CM3 ): 1.62 FOR GE, 1.70 FOR GN
C.T.E.(100 -600 C, 10 -6/C ): 2.8 FOR GE, 2.6 FOR GN
ASH: 0.3% FOR GE, 0.2% FOR GN
2.3). HP
RESISTIVITY (UOM): 6.5 FOR GE, 5.5 FOR GN
BENDING STRENGTH (MPA ): 11 FOR GE, 15 FOR GN
BULK DENSITY(G/CM3): 1.64 FOR GE, 1.72 FOR GN
C.T.E.(100 -600 C, 10 -6/C ): 2.2 FOR GE, 2.0 FOR GN
ASH: 0.2% FOR GE, 0.1% FOR GN
2.4). SHP
RESISTIVITY (UOM): 6.0 FOR GE, 5.0 FOR GN
BENDING STRENGTH (MPA ): 12 FOR GE, 16 FOR GN
BULK DENSITY(G/CM3): 1.66 FOR GE, 1.75 FOR GN
C.T.E.(100 -600 C, 10 -6/C ): 2.0FOR GE, 1.8 FOR GN
ASH: 0.2% FOR GE, 0.1% FOR GN

2.5). UHP
RESISTIVITY (UOM): 5.5 FOR GE, 4.2 FOR GN
BENDING STRENGTH (MPA): 18 FOR GE, 20 FOR GN
BULK DENSITY(G/CM3): 1.68 FOR GE, 1.78 FOR GN
C.T.E.(100 -600 C, 10 -6/C): 1.6 FOR GE, 1.4 FOR GN
ASH: 0.1% FOR GE, 0.1% FOR GN

3. CURRENT CARRYING CAPACITIES:
3.1).FOR RP GRADE:
DIA CAPACITY CURRENT DENSITY
(MM) (A) (A/cm2)
100 1500-2400 19-30
130 2200-3400 17-26
150 3500-4900 16-25
175 4000-5500 16-22
200 5500-7500 15-21
225 6000-8200 15-20
250 7500-10500 14-20
300 10000-14000 14-18
350 13000-19000 14-18
400 19000-24500 14-18
450 24000-29000 13-17
500 27000-34000 13-16
550 32000-39500 13-16
600 38000-47000 11-14
650 45000-55000 13-16
700 52000-65000 11-14
750 59500-73000 13-16
800: 70000-83000 14-17
850: 70000-83000 14-17
3.2) FOR HP GRADE
DIA CAPACITY CURRENT DENSITY
(MM) (A) (A/cm2)
200 6500-10500 18-25
225 8000-12500 18-25
250 9500-14000 18-25
300 14000-19000 17-24
350 17500-25000 17-24
400 22500-33500 16-24
450 28000-43500 15-24
500 33000-51500 15-24
550 37000-58000 14-23
600 44000-67500 14-23650 51500-75500 15-22700 60000-87000 15-22750 68400-100000 15-22
2.3). FOR UHP GRADE
DIA CAPACITY CURRENT DENSITY
(MM) (A) (A/cm2)
300 17000-24000 20-30
350 22000-32000 20-30
400 26000-42000 19-30
450 33000-46000 19-27
500 39000-57000 18-27
550 45000-64000 17-25
600 52000-76000 16-24650 62000-86000 18-25700 71000-99000 18-25750 82000-114000 18-25

NOTE: RPI IS BETWEEN RP AND HP, SHP IS BETWEEN HP AND UHP.