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Graphite Electrode

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Artificial graphite electrode is made of high-quality low ash materials, such as petroleum coke, needle coke 

and coal pitch.after calcining,burdening,kneading,forming,baking and pressure impregnation, graphitization

and then precision machined with professional CNC machining.such of the products own characteristics with

low resistivity, good electrical conductivity ,low ash, compact structure,good anti oxidation and high

mechanical strength, so it is the best conductive material for electric arc furnace and smelting furnace. 


Connection of graphite electrode

1. Wet graphite electrodes must be dried prior to use.

2. The foam protective caps on the electrodes socket shall be removed to verfy the integrity of  the internal threads of the electroded socket.

3. The surfaces of the electrodes and the internal threads of the socket shall be cleared by compressed air free of any oil and water.no steel wool or metal sand cloth shall be used in such clearance.

4. The nipple must be screwed carefully into the electrode socket of one end of the electrode without collision with the internal threads (it is not suggested to directly put the nipple into the electrode removed from the furnace).

5. The lifting appliance(it's preferred to adopt graphite lifting appliance) should be screwed into the electrode socket of the other end of the electrode.

6. When lifting the electrode,cushion-like materials must be put on the ground under the connecting end of the electrode to avoid and collision,after the lifting hook has been put into the ring of the lifting appliance,the electrode shall be lifted smoothly to prevent to prevent it from falling or colliding with any other fixture.

7. The electrode shall be lifted above the head of the working electrode and dropped slowly aiming at the electrode socket,then the electrode will be screwed to make the helical hook and the electrode declining and turning together,when the distance between the end faces of two electrodes is 10-20mm, the two end face of the electrodes and the outer part of the nipple must be cleared again by compressed air.finally,the electrode must be laid gently,or the threads of the electrode socket and nipple will be damaged because of the violent collision.

8. Use torque spanner to screw the electrode until the end faces of the two electrodes contact closely (the gap of correct connection between the electrodes is less than 0.05mm)


Notes of the use of graphite electrode 

1.The electrode holder should be held in the place beyond the security line of the top electrode;otherwise, the electrode would be easily broken.the contact surface between the holder and the electrode should be cleaned up regularly to maintain a good contacting,the cooling jacket of the holder shall be avoided from water leakage. 

2.Identify the reasons it there is gap in the electrode junction,do not use them until the gap is eliminated. 

3.If there is falling off of nipple bolt when connecting electrodes,it is necessary to complete the nipple bolt. 

4.The application of electrode should avoid of tilting operation, particularly , the group of connected electrodes should not be put horizontally so as to prevent from breaking. 

5.When charging materials to the furnace,the bulk materials should be charged to the place of the furnace bottom,so as to minimize the impact of the large furnace materials on the electrodes. 

6.The large pieces of insulation materials should be avoided of stacking on the bottom of the electrodes when smelting so as to prevent from affecting the electrode use or even broken. 

7.Avoid of collapsing the furnace lid when rising or dropping the electrodes,which may result in electrode damage. 

8.It is necessary to prevent the steel slag from splashing to the threads of the electrodes or nipple stored in the smelting site,which may damage the precision of the threads. 

Production Equipment

 

 

Properties

 

Unit

                          Nominal Diameter Of Electrode

UHP

HP

RP

300-600 mm

650-800mm

300-800mm

300-800mm

Electric resistivity

Electrode

μΩ.m

4.8-5.8

4.6-5.8

5.8-6.6

7.8-8.8

Nipple

3.8-4.5

3.8-4.5

4.2-5.0

5.0-6.5

Flexural strength

Electrode

Mpa

10.0-14.0

10.0-14.0

10.0-13.0

7.0-12.0

Nipple

20.0-26.0

22.0-26.0

18.0-22.0

15.0-20.0

Young’s modulus

Electrode

Gpa

9.0-13.0

10.0-14.0

8.0-12.0

7.0-9.3

Nipple

15.0-18.0

15.0-18.0

14.0-16.0

12.0-14.0

CTE(100-600℃)

Electrode

×10-6/℃

1.1-1.4

1.1-1.4

1.6-1.9

2.2-2.6

Nipple

0.9-1.2

0.9-1.2

1.1-1.4

2.0-2.5

       Ash


0.3

0.3

0.3

0.5

Sizes and permissible variation of graphite electrode

Nominal Diameter

Actual Diameter(mm)

Actual Length(mm)

mm

in

 Max

 Min

Black cover part

Length

Tolerance

Short ruler sizes

200

8

205

200

197

1600 1800

±100

-275

250

10

256

251

248

300

12

307

302

299

350

14

357

352

349

400

16

409

403

400

1600 1800 2000 2200

450

18

460

454

451

500

20

511

505

502

550

22

562

556

553

600

24

613

607

604


Packing 

Graphite electrode is packaged by wooden cages and nipple is packaged by wooden boxes.graphite electrode and nipple can be packaged together according to the requirements of the customers.the products are protected by waterproof and dustproof plastic inside and fixed by steel bands,fit for road and sea transportation.

 


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