Graphite electrode is a major conduction material used in the electric smelting industry, which has the properties of superior electric conductivity, thermal conductivity, high strength, oxidation and corrosion resistance in high temperature. Graphite electrode is typically used in the EAF smelting steel, the submerged-arch furnace producing ferroalloy, pure silicon, phosphor, matte, calcium carbide, etc. Nowadays, graphite electrode has been essential part of the raw material industry.
There are three types of graphite electrodes, which are RP,HP and UHP.
Specifications of RP Electrodes
项目 Items | 分类 Classification | 单位 Unit | 公称直径（mm）Nominal Diameter (mm) |
75～130 | 150～200 | 250～300 | 350 | 400～500 | 550～700 |
优级 Grade A | 一级 Grade B | 优级 Grade A | 一级 Grade B | 优级 Grade A | 一级 Grade B | 优级 Grade A | 一级 Grade B | 优级 Grade A | 一级 Grade B | 矿热炉电极 Electrode for mineral melting |
电阻率 ≯ Specific Resistance | 本体 Pole | μΩm | 8.5 | 10.0 | 9.0 | 10.5 | 9.0 | 10.5 | 9.0 | 10.5 | 9.0 | 11.0 | 10.5 |
接头 Nipple | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 |
抗折强度≮ Bending Strength | 本体 Pole | Mpa | 10.0 | 10.0 | 7.8 | 7.0 | 6.8 | 6.5 |
接头 Nipple | 14.0 | 14.0 | 15.0 | 15.0 | 15.0 | 15.0 |
弹性模量≯ Young’s Modulus | 本体 Pole | Gpa | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.0 |
接头 Nipple | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 |
体积密度≮ Bulk Density | 本体 Pole | g/cm3 | 1.58 | 1.54 | 1.53 | 1.53 | 1.53 | 1.52 | 1.53 |
接头 Nipple | 1.63 | 1.63 | 1.68 | 1.68 | 1.68 | 1.68 |
热膨胀系数 CTE (100℃-600℃) | 本体 Pole | ×10-6/℃ | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 |
接头 Nipple | 2.7 | 2.7 | 2.8 | 2.8 | 2.8 | 2.8 |
灰分 ≯ Ash Content |
| % | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
Note: Ash Content and CTE are only for reference.
Specification of HP Graphite Electrodes
项目Items | 分类 Classification | 单位 Unit | 公称直径（mm）Nominal Diameter |
高功率石墨电极 HP Graphite Electrode | 高功率II型石墨电极 Type II HP Graphite Electrode |
200～400 | 450～500 | 550～700 | 350～400 | 450～500 |
电阻率 ≯ Specific Resistance | 本体 Pole | μΩm | 7.0 | 7.0 | 7.0 | 6.5 | 6.5 |
接头 Nipple | 6.0 | 6.0 | 5.8 | 5.5 | 5.5 |
抗折强度 ≮ Bending Strength | 本体 Pole | Mpa | 10.5 | 10.0 | 10.0 | 10.0 | 10.0 |
接头 Nipple | 16.0 | 16.0 | 16.0 | 18.0 | 18.0 |
弹性模量 ≯ Young’s Modulus | 本体 Pole | Gpa | 12.0 | 12.0 | 12.0 | 14.0 | 14.0 |
接头 Nipple | 16.0 | 16.0 | 16.0 | 18.0 | 18.0 |
体积密度 ≮ Bulk Density | 本体 Pole | g/cm3 | 1.62 | 1.62 | 1.62 | 1.64 | 1.63 |
接头 Nipple | 1.72 | 1.72 | 1.72 | 1.72 | 1.72 |
热膨胀系数 ≯ CTE（100℃-600℃） | 本体 Pole | ×10-6/℃ | 2.4 | 2.4 | 2.4 | 2.2 | 2.2 |
接头 Nipple | 2.2 | 2.2 | 2.2 | 1.6 | 1.6 |
灰分 ≯ Ash Content |
| % | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
Note: Ash Content is only for reference.
Specification of UHP Graphite Electrodes
项目 Items | 分类 Classification | 单位 Unit | 公称直径（mm）Nominal Diameter (mm) |
300～400 | 450～500 | 550～600 | 700 |
电阻率 ≯ Specific Resistance | 本体 Pole | μΩm | 6.2 | 6.3 | 6.3 | 6.3 |
接头 Nipple | 5.0 | 5.0 | 4.5 | 4.5 |
抗折强度 ≮ Bending Strength | 本体 Pole | Mpa | 10.5 | 10.5 | 11.0 | 11.0 |
接头 Nipple | 18.0 | 18.0 | 20.0 | 20.0 |
弹性模量 ≯ Young’s Modulus | 本体 Pole | Gpa | 14.0 | 14.0 | 14.0 | 14.0 |
接头 Nipple | 18.0 | 18.0 | 22.0 | 22.0 |
体积密度 ≮ Bulk Density | 本体 Pole | g/cm3 | 1.66 | 1.66 | 1.66 | 1.66 |
接头 Nipple | 1. 75 | 1.75 | 1.75 | 1.78 |
热膨胀系数 ≯ CTE（100℃-600℃） | 本体 Pole | ×10-6/℃ | 1.5 | 1.5 | 1.4 | 1.4 |
接头 Nipple | 1.4 | 1.4 | 1.2 | 1.2 |
灰分 ≯ Ash Content |
| % | 0.3 | 0.3 | 0.5 | 0.5 |
Note: Ash Content is only for reference.
Graphite Electrode Operation Current
公称直径(mm) Nominal Diameter | 允许电流负荷（A） Operation Current (Ampere) |
普通功率 石墨电极 RP Electrode | 浸渍石墨电极 Impregnated Electrode | 高功率石墨电极 HP Electrode | 高功率石墨 电极II型 Type II HP | 超高功率 石墨电极 UHP Electrode |
75 | 1000～1400 | 1300～2000 | —— | —— | —— |
100 | 1500～2400 | 1800～3000 | —— | —— | —— |
130 | 2200～3400 | 2800～4200 | —— | —— | —— |
150 | 3000～4500 | 4000～5000 | —— | —— | —— |
200 | 5000～6900 | 4800～9000 | 5500～9000 | —— | —— |
250 | 7000～10000 | 8000～12000 | 8000～13000 | —— | —— |
300 | 10000～13000 | 11000～16000 | 13000～17400 | —— | 15000～22000 |
350 | 13500～18000 | 15000～22000 | 17400～24000 | 19000～28000 | 20000～30000 |
400 | 18000～23500 | 20000～28000 | 21000～31000 | 23000～35000 | 25000～40000 |
450 | 22000～27000 | 24000～34000 | 25000～40000 | 30000～42000 | 32000～45000 |
500 | 25000～32000 | 28000～42000 | 30000～48000 | 35000～50000 | 38000～55000 |
550 | 28000～36000 | —— | 34000～55000 | —— | 45000～65000 |
600 | 35000～41000 | —— | 38000～61000 | —— | 50000～75000 |
700 | 39000～48000 | —— | 45000～75000 | —— | 60000～100000 |
Note: On EAF, the current should be reduced by 10%; On LF, the current should be increased by 10%.
