Technical Specification of Graphite Electrodes and Nipples

Item Unit Nominal Diameter(mm)
RP HP UHP
300-450 500-800 350-700 550-700 350-500 550-750
I II I II Gurantee Typical Gurantee Typical
LSR≤ Electrode μΩ.M 9.0 11 9.0 10.5 7.5 7.5 6.3 5.0-6.0 5.8 4.8-5.5
Nipple 8.0 8.0 6.3 6.3 5.3 3.8-4.5 4.3 3.5-4.1
Flexural Strength ≥ Electrode Mpa 7.0 6.5 10.0 8.5 10.5 11.0-13.0 10.0 10.0-13.0
Nipple 15.0 15.0 17.0 17.0 20.0 20.0-25.0 23.0 24.0-30.0
Elastic Modulus ≤ Electrode Gpa 9.3 9.3 14.0 14.0 14.0 8.0-12.0 14.0 7.0-10.0
Nipple 14.0 14.0 16.00 16.00 20 12.0-16.0 22 16.0-21.0
Bulk Density ≥ Electrode g/cm³ 1.53 1.52 1.60 1.60 1.66 1.68-1.73 1.68 1.69-1.73
Nipple 1.70 1.70 1.72 1.72 1.75 1.76-1.82 1.78 1.79-1.84
CTE ≤ Electrode 10-6/ ℃ 2.9 2.9 2.4 2.4 1.5 1.3-1.5 1.5 1.3-1.5
Nipple 2.8 2.8 2.2 2.2 1.4 1.0-1.3 1.3 1.0-1.3
Ash ≤ % 0.5 0.5 0.5 0.5 0.5 0.2-0.4 0.5 0.2-0.4

Electrode Dimension and Allowable Tolerance

Grade Nominal Dia(mm) Nominal Dia(inch) Max (mm) Min (mm) Nominal Length
RP Electrodes 300 12 307 302 1600/1800/2000
350 14 358 352 1600/1800/2000
400 16 409 403 1600/1800/2000/2200
450 18 460 454 1600/1800/2000/2200
500 20 511 505 1800/2000/2200/2400
550 22 562 556 1800/2000/2200/2400/2700
600 24 613 607 2000/2200/2400/2700
650 26 663 659 2000/2200/2400/2700
700 28 714 710 2000/2200/2400/2700
HP Electrodes 200 8 205 200 1600/1800
250 10 256 251 1600/1800
300 12 307 302 1600/1800/2000
350 14 358 352 1600/1800/2000
400 16 409 403 1600/1800/2000/2200
450 18 460 454 1600/1800/2000/2200
500 20 511 505 1800/2000/2200/2400
550 22 562 556 1800/2000/2200/2400/2700
600 24 613 607 2000/2200/2400/2700
650 26 663 659 2000/2200/2400/2700
700 28 714 710 2000/2200/2400/2700
UHP Electrodes 300 12 307 302 1600/1800/2000
350 14 358 352 1600/1800/2000
400 16 409 403 1600/1800/2000/2200
450 18 460 454 1600/1800/2000/2200
500 20 511 505 1800/2000/2200/2400
550 22 563 556 1800/2000/2200/2400/2700
600 24 613 607 2000/2200/2400/2700/3000
650 26 663 659 2200/2400/2700/3000
700 28 714 710 2200/2400/2700/3000

Electorde Length And Allowable Tolerance

Nominal Dia(mm) Standard(mm) Shortened(mm)
Max Min Max Min
1600 1700 1500 1500 1325
1800 1900 1700 1700 1525
2000 2100 1900 1900 1825
2200 2300 2100 2100 1925
2400 2500 2300 2300 2125
2700 2900 2550 2550 2400
3000 3200 2850 2850 2700

Note: Specific length can be supplied according to customer’s demand.

Recommended Current Load Of Electrode

Grade Nominal Dia(mm)   Allowable current (A)  Current density(A/cm3)
AC DC AC DC
 RP Electrode 200 5000-6900 15-21
250 7000-10000 14-20
300 10000-13000 14-18
350 13500-18000 14-18
400 18000-23500 14-18
450 22000-27000 13-17
500 25000-32000 13-16
550 28000-34000 12-14
600 30000-36000 11-13
650 32000-39000 10-12
700 34000-42000 9-11
HP Electrode 200 5500-9000 18-25
250 6500-10000 18-25
300 13000-17400 17-24
350 17400-24000 17-24
400 21000-31000 16-24
450 25000-40000 15-24
500 30000-48000 15-24
550 34000-53000 14-22
600 38000-58000 13-21
650 41000-65000 12-20
700 45000-72000 12-19
UHP Eletrode 300 15000-22000 20-30
350 20000-30000 20-30
400 25000-40000 19-30
450 32000-45000 19-27
500 38000-55000 18-27
550 45000-65000 49000-78000 18-27 20-32
600 50000-75000 58000-93000 18-26 20-32
650 60000-85000 64000-100000 18-25 20-32
700 70000-120000 79000-120000 18-30 20-30

 

Dimension of nipples and Sockets of Electrodes

Grade Nominal Dia (inch) Nominal Dia (mm) IEC Code Nipple(mm) Medium Dia(mm) Socket(mm) Pitch(mm)
Large Dia Length Small Dia Depth
RP/HP/     UHP 12 300 177T3N 177.16 270.9 172.95 168.73 141.5 8.47
14 350 215T3N 215.9 304.8 211.69 207.47 158.4
16 400 215T3N 215.9 304.8 211.69 207.47 158.4
16 400 241T3N 241.3 338.7 237.09 232.87 175.3
18 450 241T3N 241.3 338.7 237.09 232.87 175.3
18 450 241T3L 273.05 355.6 268.84 264.62 183.8
20 500 273T3N 273.05 355.6 268.84 264.62 183.8
12 300 177T4N 177.8 215.9 174.64 171.48 114 6.35
14 350 203T4N 203.2 254 200.04 196.88 133
16 400 222T4N 222.25 304.8 219.09 215.93 158.4
16 400 222T4L 222.25 355.6 219.09 215.93 183.8
18 450 241T4N 241.3 304.8 238.14 234.98 158.4
18 450 241T4L 241.3 355.6 238.14 234.98 183.8
20 500 269T4N 269.88 355.6 266.72 263.56 183.8
20 500 269T4L 269.88 457.2 266.72 263.56 234.6
22 550 298T4N 298.45 355.6 295.29 292.13 183.8
22 550 298T4L 298.45 457.2 295.29 292.13 234.6
24 600 317T4N 317.5 355.6 314.34 311.18 183.8
24 600 317T4L 317.5 457.2 314.34 311.18 234.6
26 650 355T4N 355.6 457.2 352.44 349.28 234.6
26 650 355T4L 355.6 558.8 352.44 349.28 285.4
28 700 374T3N 374.65 457.2 371.49 368.33 234.6
28 700 374T4L 374.65 558 371.49 368.33 285.4