Graphite Electrodes

Graphite Electrodes

Nipples

Technical Support

Electrode Handling

Graphite electrodes carry the electric current to create an arc that generates the heat required to melt and/or process various materials in electric arc furnaces (EAF). GES Graphite offers several grades and sizes of electrodes to match the customers most demanding requirements for their particular process.

Electrode Diameters
Nominal Diameter Full Tolerance Nominal Length
min max
mm inch mm mm mm inch
50 2 50 53 1000 / 1200 / 1500 36 / 48 / 60
75 3 75 78 1000 / 1200 / 1500 / 1800 36 / 48 / 60 / 72
100 4 100 103 1200 / 1500 / 1800 48 / 60 / 72
125 5 125 128 1200 / 1500 / 1800 48 / 60 / 72
150 6 150 153 1200 / 1500 / 1800 48 / 60 / 72
200 8 200 203 1500 / 1800 60 / 72
225 9 225 228 1500 / 1800 60 / 72
250 10 250 253 1500 / 1800 60 / 72
300 12 300 303 1500 / 1800 / 2100 60 / 72 / 84
350 14 350 353 1500 / 1800 / 2100 60 / 72 / 84
400 16 400 403 1500 / 1800/ 2100 / 2400 60 / 72 / 84 / 96
450 18 450 453 1500 / 1800 / 2100 / 2400 60 / 72 / 84 / 96
500 20 500 503 1800 / 2100 / 2400 / 2700 72 / 84 / 96 / 110
550 22 550 553 1800 / 2100 / 2400 / 2700 72 / 84 / 96 / 110
600 24 600 603 2100 / 2400 / 2700 84 / 96 / 110
650 26 650 653 2400 / 2700 96 / 110
700 28 700 703 2400 / 2700 96 / 110
Electrode Length
Nominal Length Full Tolerance
min max
mm inch mm mm
1000 36 900 1110
1200 48 1100 1310
1500 60 1400 1610
1800 72 1689 1915
2100 84 1969 2220
2400 96 2273 2525
2700 110 2526 2906
Electrode Properties

 

Diameter

  Premium XP UHP
mm 50 – 450 50 – 550 200 – 700
inch 2 – 18 2 – 22 8 – 28
Density g/cm3 1.62 – 1.65 1.64 – 1.68 1.67 – 1.73
Resistivity u Ω m 6.5 – 7.0 5.5 – 6.0 4.5 – 5.0
Ash % 0.2 – 0.4 0.2 – 0.4 0.2 – 0.4
Bending Strength Mpa 8.0 – 10.0 9.0 – 12.0 10.0 – 13.0
C.T.E. ( 100~600°C) 2.5 – 2.9 2.0 – 2.4 1.5 – 1.9

Brochures

GES Graphite Electrodes (2-28″)

GES Graphite offers 3 TPI, 4 TPI, and Male/Female connections. GES Graphite delivers graphite nipples with each electrode based upon customer requirements. All nipples are manufactured with 100% needle coke and  the quality is certified by our technical team. Additional nipples are available upon request. GES Graphite guarantees all nipples meet industry specifications and will meet the customers expectations.

Standard Nipple 4 TPI
Nominal Electrode Diameter Nipple
mm inch Diameter (mm) Length (mm) Type
50 2
75 3 41.2 103.0 41T4N
100 4 66.7 135.0 66T4N
125 5 69.8 153.0 69T4N
150 6 88.9 169.0 88T4N
200 8 122.2 177.8 122T4N
225 9 139.7 177.8 139T4N
250 10 152.4 190.5 152T4N
300 12 177.8 216.0 177T4N
350 14 203.2 254.0 203T4N
400 16 222.3 304.8 222T4N
450 18 241.3 304.8 241T4N
500 20 269.9 355.6 269T4N
550 22 298.5 355.6 298T4N
600 24 317.5 355.6 317T4N
650 26 355.6 457.2 355T4N
700 28 374.7 558.8 374T4N
Long Nipple 4 TPI
Nominal Electrode Diameter Nipple
mm inch Diameter/mm Length/mm Type
400 16 222.3 355.6 222T4L
450 18 241.3 355.6 241T4L
500 20 269.9 457.2 269T4L
550 22 298.5 457.2 298T4L
600 24 317.5 457.2 317T4L
650 26 355.6 558.8 355T4L
700 28 374.7 558.8 374T4L
Standard Nipple 3 TPI
Nominal Electrode Diameter Nipple
mm inch Diameter/mm Length/mm Type
225 9      
250 10      
300 12      
350 14 215.1 304.8 215T3
400 16 215.1 304.8 215T3
400 16 241.3 338.6 241T3
450 18 241.3 388.6 241T3
450 18 273.1 338.6 273T3
500 20 273.1 355.6 273T3
550 22 298.5 372.5 298T3
Electrode Joints

GES Graphite is able to offer torque wrenches to maximize the joint contact and column performance. Lifting plugs are also available to provide safe and convenient handling and transport of the electrode column. These tools will enable the customer to maximize the life and operation of the electrodes.

EAF2-300

GES Graphite has a group of experts in the field of servicing graphite electrodes. All of our technicians are trained engineers that have worked in furnaces or within graphite manufacturers in the past. We know all of the EAF, Ladle, and Foundry applications throughout North and South America.

Beyond the standard procedure of selling electrodes, we help the customer in many ways. This includes identifying a problem before it happens, increasing productivity, training employees on the job, and solving any problems the customer may have at that time.

We offer many services including monitoring a trial, performance analysis, storage in our warehouses, inspection of accessories, and monitoring the furnace. GES Graphite offers these services in part of selling the raw materials.

Graphite electrodes are heavy and slippery. While handling, caution should be exercised at all times. The following points are offered as suggestions.

  1. When unloading pallets upon receipt, unloading individual electrodes, or transporting to the EAF, care should be taken to insure lifting is secure.
  2. When the individual electrode is being lifted by crane or by forklift, personnel should allow safe distance staying well clear of the load. Use roll blocks/stoppers to prevent uncontrolled rolling of the electrode.
  3. During storage, minimize stack height to avoid an unstable condition. Consult with engineering or warehouse management for the maximum height for safe storage.
  4. During usage the electrode, and/or electrode column, may drop or swing causing potential physical injury to shop personnel or damage to equipment. Therefore, GES recommends the following:
    • Do not use any electrodes whose threads or end faces are damaged or broken. Contact supervision.
    • When connecting, first clean the joint by air-blowing insuring a clean face and threads. To prevent the joint from becoming dirty, use a column cap.
    • When moving an electrode to move to or from the EAF, avoid lifting in the socket area by securing the electrode body inside of the designated socket limit stripe marked on the electrode body.
    • Securely center and tighten the electrode with the proper wrench and specified torque. Do not use any electrode column with a loose joint.
    • Be aware that since graphite conducts electricity and heat well, the electrode may give an electric shock or cause a burn.
    • During operation, maintain a safe distance from the furnace observing all shop safety rules. If required to enter the EAF area, always wear protective heat resistant clothing, gloves/face and eye protection, etc
  5. On handling broken or used electrodes, follow these precautions:
    • When removing an electrode from the EAF, use a chain or tongs to secure the electrode. Do not use a wire lift as that could allow the electrode to slip free.
    • During the lifting of an electrode, remain well clear of the suspended electrode and the travel pathway.
    • When cutting a broken electrode, use a dustproof mask/goggles and a dust collector to avoid the fine dust that occurs which can be harmful to lungs and eyes by inhalation and adhesion.
    • At the sign of any physical disorder, contact first aid and/or a doctor.
    • Be careful to avoid slippage in areas exhibiting graphite dust. Do not step on any bare slippery electrodes.
    • Even when appearing black, an electrode may be too hot to touch. Do not leave any combustible material in a broken electrode yard.