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Physical and Chemical Index of Graphite Electrode

Project

Unit

Ordinary work

High power

Ultra high power

≤φ400

≥φ450

≤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

Connector

4.2-5.2

3.5-4.5

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

Connector

17.0-22.0

20.0-26.0

21.0-28.0

24.0-30.0

Elastic Modulus

Electrode

Gpa

6.0-9.0

9.0-12.0

9.0-12.0

Connector

12.0--16.0

13.0-18.0

15.0-20.0

Ash

Electrode

%

0.4

0.2

0.2

Connector

Bulk density

Electrode

g/cm³

1.54-1.62

1.66-1.73

1.66-1.74

1.68-1.74

Connector

1.72-1.77

1.77-1.82

1.80-1.85

Thermal expansion coefficient (100-600℃)

Electrode

10-6/℃

2.0-2.4

1.6-1.8

1.1-1.5

Connector

1.5-2.0

1.3-1.5

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

 

 

 

Thread size table

Nominal diameter

IEC

Connector(mm)

Connector Hole size(mm)

Pitch

Code

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

80.00

<7

115.92

94.90

6.35

250

10

152T4N

152.40

190.50

108.00

146.08

101.30

300

12

177T4N

177.80

215.90

129.20

171.48

114.00

350

14

203T4N

203.20

254.00

148.20

196.88

133.00

400

16

222T4N

222.25

304.80

158.80

215.93

158.40

400

16

222T4L

222.25

355.60

150.00

215.93

183.80

450

18

241T4N

241.30

304.80

177.90

234.98

158.40

450

18

241T4L

241.30

355.60

169.42

234.98

183.80

500

20

269T4N

269.88

355.60

198.00

263.56

183.80

500

20

269T4L

269.88

457.20

181.08

263.56

234.60

550

22

298T4N

298.45

355.60

226.58

292.13

183.80

550

22

298T4L

298.45

457.20

209.65

292.13

234.60

600

24

317T4N

317.50

355.60

245.63

311.18

183.80

600

24

317T4L

317.50

457.20

228.70

311.18

234.60

650

26

355T4N

255.60

457.20

266.79

349.28

234.60

650

26

355T4L

355.60

558.80

249.86

349.28

285.40

700

28

374T4N

374.65

457.20

285.84

368.33

234.60

700

28

374T4L

374.65

558.80

268.91

368.33

285.40

750

30

406T4N

406.40

584.20

296.42

400.08

298.10

750

30

406T4L

406.40

609.60

292.19

400.08

310.80

800

32

431T4N

431.80

635.00

313.36

425.48

323.50

800

32

431T4L

431.80

685.80

304.89

425.48

348.90

250

10

155T3N

155.57

220.00

103.80

<10

147.14

116.00

8.47

300

12

177T3N

177.16

270.90

116.90

168.73

141.50

350

14

215T3N

215.90

304.80

150.00

207.47

158.40

400

16

241T3N

241.30

338.70

169.80

232.87

175.30

450

18

273T3N

273.05

355.60

198.70

264.62

183.80

500

20

298T3N

298.45

372.60

221.30

290.02

192.20

550

22

298T3N

298.45

372.60

221.30

290.02

192.20 

 

Graphite Electrode recommended current load table

Nominal diameter

Allowable current load

 

Ordinary power graphite Electrode

High power graphite Electrode

Ultra high power graphite Electrode

mm

A

A/C m³

A

A/C m³

A

A/C m³

200

5000-6900

15-21

5500-9000

18-25

 

 

250

7000-10000

14-20

8000-13000

18-25

 

 

300

10000-13000

14-18

13000-17400

17-24

15000-22000

20-30

350

13500-18000

14-18

17400-24000

17-24

20000-30000

20-30

400

18000-23500

14-18

21000-31000

16-24

25000-40000

19-30

450

22000-27000

13-17

25000-40000

15-24

32000-45000

19-27

500

25000-32000

13-16

30000-48000

15-24

38000-55000

18-27

550

28000-34000

13-16

34000-53000

14-22

45000-65000

18-27

600

30000-36000

11--13

38000-58000

13-21

50000-75000

18-26

650

32000-39000

10--12

41000-65000

12--20

60000-85000

18-25

700

34000-42000

9--11

45000-72000

12--19

70000-120000

18-30

 

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