RP, HP and UHP Graphite Electrode
Graphite electrodes, use petroleum coke, needle coke as raw material, coal tar pitch as binder, through mixing, extruding, baking, graphitizing , and machined to the shape. Wildly used in steelmaking, non ferrous, silicon industry. According to their level of quality, it can be divided into RP, HP and UHP grade.
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UHP GRAPHITE ELECTRODE |
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ELECTRODE |
NIPPLE |
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ITEMS |
UNIT |
GUARANTEE |
TYPICAL |
GUARANTEE |
TYPICAL |
|
RESISTIVITY |
µ.Ωm |
≤6.3 |
5.4-5.9 |
≤4.0 |
3.3-3.7 |
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DENSITY |
g/cm3 |
≥1.66 |
1.67-1.70 |
≥1.75 |
1.77-1.80 |
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BENDING |
MPa |
≥10.5 |
12-14 |
≥18.0 |
22-25 |
|
CTE |
X10-6/℃ |
≤1.5 |
1.1-1.3 |
≤1.4 |
1.0-1.2 |
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ASH |
% |
≤0.3 |
0.15 |
≤0.3 |
0.12 |
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Carrying Capacity And Current Density |
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Nominal Diameter |
UHP GRADE |
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mm |
inch |
Current load A |
Current density A/cm2 |
|
300 |
12 |
15000-22000 |
20-30 |
|
350 |
14 |
20000-30000 |
20-30 |
|
400 |
16 |
25000-40000 |
19-30 |
|
450 |
18 |
32000-45000 |
19-27 |
|
500 |
20 |
38000-55000 |
18-27 |
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550 |
22 |
45000-65000 |
17-26 |
|
600 |
24 |
50000-75000 |
17-25 |
|
700 |
28 |
60000-100000 |
17-25 |
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Specifications and allowance of graphite electrode |
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Nominal Dia. |
Actual Dia. |
Nominal Length |
Allowance |
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mm |
inch |
max |
min |
mm |
inch |
mm |
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|
75 |
3 |
77 |
74 |
1000 |
40 |
+50/-75 |
|
|
100 |
4 |
102 |
99 |
1200 |
48 |
+50/-75 |
|
|
150 |
6 |
154 |
151 |
1600 |
60 |
+/100 |
|
|
200 |
8 |
204 |
201 |
1600 |
60 |
+/100 |
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|
225 |
9 |
230 |
226 |
1600/1800 |
60/72 |
+/100 |
|
|
250 |
10 |
256 |
252 |
1600/1800 |
60/72 |
+/100 |
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|
300 |
12 |
307 |
303 |
1600/1800 |
60/72 |
+/100 |
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|
350 |
14 |
357 |
353 |
1600/1800 |
60/72 |
+/100 |
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|
400 |
16 |
408 |
404 |
1600/1800/2000/2200 |
60/72//79/86 |
+/100 |
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|
450 |
18 |
459 |
455 |
1600/1800/2000/2200 |
60/72//79/86 |
+/100 |
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|
500 |
20 |
510 |
506 |
1800/2000/2200/2400 |
72/79/86/96 |
+/100 |
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|
550 |
22 |
562 |
556 |
1800/2000/2200/2400 |
72/79/86/96 |
+/100 |
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|
600 |
24 |
613 |
607 |
2100/2400/2700 |
83/96/106 |
+/100 |
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|
700 |
28 |
711 |
708 |
2400/2700 |
96/106 |
+/100 |
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