Guidance To Analysis Of Electrodes Problems In EAF
Graphite electrodes are an important aspect of steelmaking.During this process,there are specific problems happened which hamper the efficacy of steelmaking.It is essential to have proper guidance for the analysis of graphite electrodes problems in steelmaking.
|
Factors |
Electrode Breakage |
Nipple Breakage |
Loosening |
Tip Spalling |
Bolt loss |
Oxidation |
Consumption |
| Nonconductor in charge |
※ |
※ |
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|
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| Heavy scrap in charge |
※ |
※ |
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| Transformer capacity too large |
※ |
※ |
|
※ |
※ |
※ |
※ |
| Phase lm balance |
※ |
※ |
|
※ |
※ |
|
※ |
| Phase rotation |
|
※ |
※ |
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|
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| Excessive vibration |
※ |
※ |
※ |
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|
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| Clamp pressure much high low |
※ |
※ |
※ |
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|
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| roof electrode socket center not aligned with electrode |
※ |
※ |
※ |
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|
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| Water sprayed on electrodes above roof |
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|
□ |
| Scrap preheating |
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|
□ |
| Secondary voltage much high |
※ |
※ |
|
※ |
※ |
|
※ |
| Secondary current much high |
※ |
※ |
|
※ |
※ |
※ |
※ |
| Power factor very low |
※ |
※ |
|
※ |
※ |
|
※ |
| Oil consumption much high |
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|
|
※ |
※ |
※ |
※ |
| Oxygen consumption much high |
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|
|
※ |
※ |
※ |
※ |
| Long time gap from tapping to tapping |
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|
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|
|
※ |
※ |
| Electrode dipping |
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|
|
|
※ |
|
※ |
| Dirty joint |
|
※ |
※ |
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|
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| Poorly maintained lift plug and tightening tool |
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※ |
※ |
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|
※ |
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| Insufficient joint tightening |
|
※ |
※ |
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|
※ |
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Note: □---Increased electrode performance;※---Decreased electrode performance.
Comprehensive guidance to analyze and solve graphite electrode problems will not only improve the efficacy of steelmaking but also increase productivity and profitability.
Graphite Electrode Recommended Joint Torque Chart
|
Electrode Diameter |
Torque |
Electrode Diameter |
Torque |
||||
|
inch |
mm |
ft-lbs |
N·m |
inch |
mm |
ft-lbs |
N·m |
|
12 |
300 |
480 |
650 |
20 |
500 |
1850 |
2500 |
|
14 |
350 |
630 |
850 |
22 |
550 |
2570 |
3500 |
|
16 |
400 |
810 |
1100 |
24 |
600 |
2940 |
4000 |
|
18 |
450 |
1100 |
1500 |
28 |
700 |
4410 |
6000 |
| Note: When connecting two poles of electrode, avoid over pressure for electrode and cause bad effect.Please refer to the rated torque in the above chart. | |||||||
Post time: May-01-2023