Physical and Chemical Index of Ultra high Power Graphite Electrode | |||||
Item | Unit | UHP | |||
300~500 | 550~600 | 700~800 | |||
Electric Resistivity | Electrode | uΩ.m | 4.6~6.2 | 4.5~6.0 | 4.5~5.8 |
Nipple | 3.5~5.0 | 3.4~4.5 | 3.3~4.3 | ||
Bending Strength | Electrode | MPa | ≥10.5 | ≥10.0 | ≥10.0 |
Nipple | ≥20.0 | ≥22.0 | ≥23.0 | ||
Modulus of Elasticity | Electrode | GPa | ≤14.0 | ≤14.0 | ≤14.0 |
Nipple | ≤20.0 | ≤22.0 | ≤22.0 | ||
Bulk Density | Electrode | G/cm3 | 1.66~1.73 | 1.68~1.74 | |
Nipple | 1.75~1.82 | 1.78~1.85 | |||
Ash Content | Electrode | % | ≤0.3 | ||
Nipple | |||||
The Coefficient of Thermal Expansion(CTE) | Electrode | 10-6/℃ | 1.20~1.50 | 1.10~1.50 | |
Nipple | 1.10~1.40 | 1.00~1.30 |
UHP Graphite Electrode Current Carrying Capacity | |||
Norminal Diameter | UHP | ||
Current Carrying Capacity | Current Density | ||
inch | mm | A | A/cm2 |
12 | 300 | 15000~22000 | 20~30 |
14 | 350 | 20000~30000 | 20~30 |
16 | 400 | 25000~40000 | 19~30 |
18 | 450 | 32000~45000 | 19~27 |
20 | 500 | 38000~55000 | 18~27 |
22 | 550 | 45000~65000 | 18~27 |
24 | 600 | 50000~75000 | 18~26 |
28 | 700 | 70000~120000 | 18~25 |
32 | 800 | / | / |
Tolerance of Graphite Electrode Diameter and Length | |||||
Tolerance of Graphite Electrode Diameter and Length(mm) | |||||
Nominal Diameter | Actural diameter | Length | |||
in | mm | max | min | Black surface min | |
12 | 300 | 307 | 302 | 299 | 1800/2000 |
14 | 350 | 358 | 352 | 349 | 1800/2000/2200 |
16 | 400 | 409 | 403 | 400 | 1800/2000/2200 |
18 | 450 | 460 | 454 | 451 | 1800/2000/2200 |
20 | 500 | 511 | 505 | 502 | 2000/2200/2400 |
22 | 550 | 562 | 556 | 553 | 2000/2200/2400/2700 |
24 | 600 | 613 | 607 | 604 | 2200/2400/2700/3000 |
28 | 700 | 714 | 710 | 707 | 2200/2400/2700/3000 |
29 | 800 | 816 | 812 | 809 | 2200/2400/2700/3000 |
Permissible Deviation of Graphite Electrode Length (mm) | ||||
Nominal Length | Standard Deviation | Short Length Deviation | ||
max | min | max | min | |
1800 | +100 | -100 | -100 | -275 |
2000 | +100 | -100 | -100 | -275 |
2200 | +100 | -100 | -100 | -275 |
2400 | +100 | -100 | -100 | -275 |
2700 | +200 | -150 | -150 | -275 |
3000 | +200 | -150 | -150 | -300 |