Graphite Electrode Data

Physical and Chemical Index of Graphite Electrode
Project Unit RP
(Regular Power)		 HP
(High Power)		 UHP
(Ultra High Power)		 HD?
(High Density Power)		 SHP?
(Super High Power)
≤φ400 ≥φ450 ≤φ400 ≥φ450 ≤φ500 ≥φ550 ≤φ400 ≥φ450 ≤φ500 ≥φ550
Resistivity Electrode μ Ω m 7.0-8.5 7.5-9.0 5.2-6.3 5.3-6.3 4.5-5.8 4.5-5.8 5.3-6.5 5.4-7.0 4.5-5.8 4.5-5.8
Connector 4.2-5.2 3.5-4.5 3.0-4.0 3.8-4.8 3.0-4.0
Flexural strength Electrode Mpa 7.5-9.5 7.0-8.5 10.5-15 10.5-15 12.0--17.0 11.0--16.0 10.5-15 10.5-15 12.0--17.0 11.0--16.0
Connector 17.0-22.0 20.0-26.0 21.0-28.0 24.0-30.0 18.0-24.0 21.0-28.0 24.0-30.0
Elastic Modulus Electrode Gpa 6.0-9.0 9.0-12.0 9.0-12.0 9.0-12.0 9.0-12.0
Connector 12.0--16.0.0 13.0-18.0.0 15.0-20.0.0 13.0-18.0 15.0-20.0.0
Ash Electrode % 0.4 0.2 0.2 0.3 0.2
Connector
Bulk density Electrode g/cm³ 1.54-1.62 1.66-1.73 1.66-1.74 1.68-1.74 1.64-1.72 1.66-1.74 1.68-1.74
Connector 1.72-1.77 1.77-1.82 1.80-1.85 1.74-1.79 1.80-1.85
Thermal expansion
coefficient (100-600℃)		 Electrode 10-6/℃ 2.0-2.4 1.6-1.8 1.1-1.5 1.9-2.3 1.1-1.5
Connector 1.1-1.5 1.3-1.5 0.9-1.2 1.3-1.8 0.9-1.2
Graphite Electrode specifications and allowable deviations
Nominal diameter Actual diameter(mm) Actual length(mm)
Mm in Maximum The smallest The black part is the smallest Length Length tolerance Short length
200 8 205 200 197 1600/1800    
250 10 256 251 248 1600/1800    
300 12 307 302 299 1600/1800    
350 14 357 352 349 1600/1800    
400 16 409 403 400 1800/2000/2200 ±100 -275
450 18 460 454 451 1800/2000/2200    
500 20 511 505 502 1800/2000/2200/2400    
550 22 562 556 553 2000/2200/2400    
600 24 613 607 604 2000/2200/2400/2700    
650 26 663 657 654 2400/2700    
700 28 714 708 705 2400/2700    
750 30 765 761 758 2200/2400/2700/3000    
800 32 816 812 809 2200/2400/2700/3000    
Standard dimensions for joints and holes
Nominal Electrode Diameter
(mm)(inch)		 Thread Designation Diameter Max.
(mm)		 Length Max.
(mm)		 Depth of socket Min.
(mm)		 Average Weight
(kg)		 Other Designation
IEC Diameter Length
3TPI
(Pich of Thread: 8.467mm)		 300 12 10T3 155.57 220 116 5 N155T3N 6.125 8.66
12T3 177.16 270.9 141.5 8.2 N177T3N 6.975 10.66
350 14 12T3 177.16 270.9 141.5 8.2 N177T3N 6.975 10.66
14T3 215.9 304.8 158.4 14.5 N215T3N 8.5 12
14T3L 215.9 355.6 183.8 17 N215T3L 8.5 14
400 16 14T3 215.9 304.8 158.4 14.5 N215T3N 8.5 12
14T3L 215.9 355.6 183.8 17 N215T3L 8.5 14
16T3 241.3 338.7 175.3 20.5 N241T3N 9.5 13.33
16T3L 241.3 355.6 183.8 21 N241T3L 9.5 14
450 18 16T3 241.3 338.7 175.3 20.5 N241T3N 9.5 13.33
16T3L 241.3 355.6 183.8 21 N241T3L 9.5 14
18T3 273.05 355.6 183.8 28 N273T3N 10.75 14
18T3L 273.05 457.2 234.6 34 N273T3L 10.75 18
500 20 18T3 273.05 355.6 183.8 28 N273T3N 10.75 14
18T3L 273.05 457.2 234.6 34 N273T3L 10.75 18
20T3 298.45 372.5 192.2 36 N298T3N 11.75 14.66
4TPI
(Pich of Thread:6.350mm）		 300 12 12T4 177.8 215.9 114 7.2 N177T4N 7 8.5
350 14 14T4 203.2 254 133 11.2 N203T4N 8 10
400 16 16T4 222.25 304.8 158.4 15.5 N222T4N 8.75 12
16T4L 222.25 355.6 183.8 17.4 N222T4L 8.75 14
18T4 241.3 304.8 158.4 19 N241T4N 9.5 12
18T4L 241.3 355.6 183.8 21 N241T4L 9.5 14
450 18 18T4 241.3 304.8 158.4 19 N241T4N 9.5 12
18T4L 241.3 355.6 183.8 21 N241T4L 9.5 14
20T4L 269.88 457.2 234.6 33.4 N269T4N 10.625 18
500 20 20T4 269.88 355.6 183.8 27.2 N269T4N 10.625 14
20T4L 269.88 457.2 234.6 33.4 N269T4N 10.625 18
550 22 22T4 298.45 355.6 183.8 35 N298T4N 11.75 14
22T4L 298.45 457.2 234.6 42.5 N298T4L 11.75 18
600 24 24T4 317.5 355.6 183.8 40 N317T4N 12.5 14
24T4L 317.5 457.2 234.6 48 N317T4L 12.5 18
650 26 26T4 355.6 457.2 234.6 64 N355T4N 14 18
26T4L 355.6 558.8 285.4 74 N355T4L 14 22
   700       28    28T4 374.65 457.2 234.6 71.5 N374T4N 14.75 18
28T4L 374.65 558.8 285.4 84 N374T4L 14.75 22
Sizes of conical thread and thread socket
Nominal Diameter IEC Code Sizes of Nipple (mm) Sizes of Socket (mm) Thread
mm in D Deviation(-0.5~0) L Deviation(-1~0) D2 Deviation(-5~0)    I    D1 Deviation(0~0.5) H Deviation(0~7) mm
200 8 122T4N 122.24 177.8 80 <7 115.92 94.9 6.35
250 10 152T4N 152.4 190.5 108 146.08 101.3
300 12 177T4N 177.8 215.9 129.2 171.48 114
350 14 203T4N 203.2 254 148.2 196.88 133
400 16 222T4N 222.25 304.8 158.8 215.93 158.4
400 16 222T4L 222.25 355.6 150 215.93 183.8
450 18 241T4N 241.3 304.8 177.9 234.98 158.4
450 18 241T4L 241.3 355.6 169.42 234.98 183.8
500 20 269T4N 269.88 355.6 198 263.56 183.8
500 20 269T4L 269.88 457.2 181.08 263.56 234.6
550 22 298T4N 298.45 355.6 226.58 292.13 183.8
550 22 298T4L 298.45 457.2 209.65 292.13 234.6
600 24 317T4N 317.5 355.6 245.63 311.18 183.8
600 24 317T4L 317.5 457.2 228.7 311.18 234.6
700 28 374T4N 374.65 457.2 285.84 368.33 234.6
700 28 374T4L 374.65 558.8 268.91 368.33 285.4
250 10 155T3N 155.57 220 103.8 <10 147.14 116 8.47
300 12 177T3N 177.16 270.9 116.9 168.73 141.5
350 14 215T3N 215.9 304.8 150 207.47 158.4
400 16 241T3N 241.3 338.7 169.8 232.87 175.3
450 18 273T3N 273.05 355.6 198.7 264.62 183.8
500 20 298T3N 298.45 372.6 221.3 290.02 192.2
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Cautions

  1. The graphite electrode shall be covered with rain proof tarpaulin during transportation.
  2. When the forklift handles and lifts the electrodes, be careful not to collide with each layer of goods, pay attention to balance and alignment, and avoid falling or breaking.
  3. When the crane is used for loading and unloading, the steel wire rope must be used instead of directly lifting the steel strip on the electrode.
  4. The electrodes shall be stored in a clean and dry place, and the number of layers shall not exceed four. When it rains, the electrodes shall be stacked outdoors and covered with waterproof cloth.
  5. Damp electrodes shall be placed in a drying oven for drying before use. The temperature shall not exceed 150 ℃ and the time shall not be less than 24 hours.
  6. When using electrodes, special tools shall be used to cut the steel strip, and cranes shall not be used to avoid accidents.
  7. Before connection, clean the end face of the electrode and the joint hole, screw the joint to one end of the electrode, and screw the lifting joint to the other end. Do not put the joint directly on the working electrode on the furnace.
  8. It is not allowed to clean the electrode thread with steel wire ball, metal brush or abrasive cloth. If necessary, compressed air without oil and water can be used.
  9. When the electrode sling is used for lifting, a soft pad shall be placed at the electrode joint to avoid thread damage.
  10. Lift the electrode onto the furnace with a lifter with a screw hook, align it with the center of the joint hole, move it down slowly, and then screw it in place with a torque ring.
  11. Lock the electrode with a torque wrench and appropriate torque force to ensure that there is no obvious gap between the two electrodes.
  12. If the torque force of the electrode is too large or too small, it will cause bad effects. Please apply force according to the correct torque force.
  13. The electrode holder must be placed between two white safety wires. The interface between the holder and the electrode must be cleaned regularly to maintain good contact with the electrode. The cooling water jacket of the holder should be fastened to prevent water leakage.
  14. In order to avoid electrode fracture, insulating materials shall not be put into the furnace, and the working current of the electrode must meet the allowable current load requirements of the electrode.
  15. When loading scrap steel, small pieces shall be placed on top of large pieces to avoid collapse and breaking the electrode.