Graphite electrode is made of graphite, a form of carbon that has unique properties such as
◎ high thermal conductivity,
◎ high melting point,
◎ low coefficient of thermal expansion,
◎ and good electrical conductivity.
Graphite electrodes are divided into 4 types according to power difference: RP Graphite electrodes, HP Graphite electrodes, SHP Graphite electrodes and UHP Graphite electrodes.
A graphite electrode is a type of electrode used in electric arc furnaces (EAFs) to melt and refine steel, iron, and other metals. They are essential components in the production of high-quality steel and are widely used in the metalworking industry.
Graphite electrodes are selected based on some of the following application considerations:
• Furnace design
• Scrap requirements
• Charging practice
• Burner/Oxygen usage
• Water spray rings
• Fume control system
• Meltdown/Refine/Tap-to-Tap Time
• Power level
• Slag practice
Diameter and Length for all grade Electrodes
Diameter mm | Length mm | |||||
Nominal Diameter | Actual Diameter | Nominal Length | Allowance | |||
inch | mm | Max | Min | mm | Standard | Short |
8 | 200 | 205 | 200 | 1800 | ± 100 | -275 |
10 | 250 | 256 | 251 | 1800 | ||
12 | 300 | 307 | 302 | 1800/2000 | ||
14 | 350 | 357 | 352 | 1800/2000 | ||
16 | 400 | 409 | 403 | 1800/2000 | ||
18 | 450 | 460 | 454 | 2100/2400 | ||
20 | 500 | 511 | 505 | 2100/2400 | ||
22 | 550 | 562 | 556 | 2100/2400 | ||
24 | 600 | 613 | 607 | 2400/2700 | ||
26 | 650 | 663 | 657 | 2400/2700 | ||
28 | 700 | 714 | 708 | 2500/2700 | ||
Machining Dimension of Electrode, Nipple and Sockeet
Applicable | Dia. mm | IEC code | Nipple | Socket | ||
Large Dia. mm | Length mm | Small Dia. mm | Socket Depth mm | |||
UHP HD HP RP + 3TPI | 250 | 155T3N | 155.57 | 220.00 | 147.14 | 116.00 |
300 | 177T3N | 177.16 | 270.90 | 168.73 | 141.50 | |
350 | 215T3N | 215.90 | 304.80 | 207.47 | 158.40 | |
400 | 215T3N | 215.90 | 304.80 | 207.47 | 158.40 | |
400 | 241T3N | 241.30 | 338.70 | 232.87 | 175.30 | |
450 | 241T3N | 241.30 | 338.70 | 232.87 | 175.30 | |
450 | 273T3N | 273.05 | 355.60 | 264.62 | 183.80 | |
500 | 273T3N | 273.05 | 355.60 | 264.62 | 183.80 | |
500 | 298T3N | 298.45 | 372.60 | 290.02 | 192.20 | |
550 | 298T3N | 298.45 | 372.60 | 290.02 | 192.20 | |
UHP HD HP RP + 4TPI | 200 | 122T4N | 122.24 | 177.80 | 115.92 | 94.90 |
250 | 152T4N | 152.40 | 190.50 | 146.08 | 101.30 | |
300 | 177T4N | 177.80 | 215.90 | 171.48 | 114.00 | |
350 | 203T4N | 203.20 | 254.00 | 196.88 | 133.00 | |
400 | 222T4N | 222.25 | 304.80 | 215.93 | 158.40 | |
400 | 222T4L | 222.25 | 355.60 | 215.93 | 183.80 | |
450 | 241T4N | 241.30 | 304.80 | 234.98 | 158.40 | |
450 | 241T4L | 241.30 | 355.60 | 234.98 | 183.80 | |
500 | 269T4N | 269.88 | 355.60 | 263.56 | 183.80 | |
500 | 269T4L | 269.88 | 457.20 | 263.56 | 234.60 | |
550 | 298T4N | 298.45 | 355.60 | 292.13 | 183.80 | |
550 | 298T4L | 298.45 | 457.20 | 292.13 | 234.60 | |
600 | 317T4N | 317.50 | 355.60 | 311.18 | 183.80 | |
600 | 317T4L | 317.50 | 457.20 | 311.18 | 234.60 | |
650 | 355T4N | 355.60 | 457.20 | 349.28 | 234.60 | |
650 | 355T4L | 355.60 | 558.8 | 349.28 | 285.40 | |
700 | 374T4N | 374.65 | 457.20 | 368.33 | 234.60 | |
700 | 374T4L | 374.65 | 558.80 | 368.33 | 285.40 | |
