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Graphite Electrode

The company has annual improvement and upgrading of equipment, automation of production and testing of the whole process of collecting information and data analysis, integrated statistics, online monitoring and quality management in strict accordance with the requirements of ISO9001 implementation of the whole process, to ensure product quality and highly stable.
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1.Graphite electrode is made of petroleum coke,needle coke, and bonding coal pitch. Its production process is: calcining, dosing, mixing, forming, baking and impregnation, graphitization in a high temperature of over 3000°C, then precision machining. 

Graphite electrode is acting as a conductive body which release heat in the form of arc for heating and melting steel in the furnace.According to the application, it can be divided into regular power(RP), high power(HP) and ultra high power(UHP). 

Graphite electrode is an important conductive material in smelting industry with good electrical conductivity, thermal conductivity and high mechanical strength, good corrosion resistance under high temperature. Graphite electrode is widely used in EAF, LRF, submerged arc furnace(producing ferroalloy, pure silicon, yellow phosphorus, calcium carbide etc), resistance furnace (such as the graphitization furnace, glass melting furnace and silicon carbide furnace etc). 

By close cooperation with world famous coke supplier Mithubishi, Phillips66, PMC, Handan Damai Carbon is top ranked in China carbon industry, annual exportation is over 15000mt which are widely selling to over 35 countries around the world, Handan Damai Carbon is acting as a solid bridge between world steel industry & China carbon industry, our advantages are:

Strictly control of raw material ensures it is from the best origin;

Advanced production technology & facilities &experienced workers;

Strict quality tracing system to ensure each GE excels buyer needs;

Technical assistance & after service are available whenever needed;

Sufficient stock in seaports to ensure competitive price&fast delivery; 

2.The company has annual improvement and upgrading of equipment, automation of production and testing of the whole process of collecting information and data analysis, integrated statistics, online monitoring and quality management in strict accordance with the requirements of ISO9001 implementation of the whole process, to ensure product quality and highly stable.

 

SPECIFICATION SHEET FOR PHYSICAL PROPERTIES

UHP FOR AC FURNACE

UHP FOR
DC FURNACE

Parameter

Unit

ф 200 - 300 mm

ф 350 - 500 mm

ф 550 & 600 mm

ф 650 -700 mm

ф 600 -700 mm

ф 8" - 12"

ф 14" - 20"

ф 22" & 24"

ф 26" - 28"

ф 24" - 28"

Bulk Density

gm/cm3

1.66 - 1.76

1.65 - 1.75

1.65-1.73

1.66-1.74

1.68-1.76

Speciic Resistance

m W-m

4.5 - 6.0

4.5 - 6.0

4.5-5.8

4.5-5.8

4.0-5.8

Flexural Strength

N/mm2

12-17

9 - 14

9 - 14

9 - 14

10-14

Young's Modulus

N/mm2

10-14

9-14

9-14

9-14

9-14

Ash Contents (Max)

%

0.2

0.2

0.2

0.2

0.2

C.T.E.
(Longitudinal)

CTE ( x10-7/0C) @ 0-50 0C

2.5-8.0

2.5-8.0

2.5-8.0

2.0 -5.0

2.0 -5.0

 

UHP-LF

Parameter

Unit

f 300 - 500 mm

f 12" - 20"

Bulk Density

gm/cm3

1.65 - 1.75

Specific Resistance

m W-m

4.5 – 6.0

Flexural Strength

N/mm2

9 - 14

Young's Modulus

N/mm2

8.5 - 14.5

Ash Contents (Max)

%

0.2

C.T.E. (Longitudinal)

CTE ( x10-7/0C) @ 0- 50 0C

3.0 - 8.5

 

HP

Parameter

Unit

f 150 - 300 mm

f 350 - 500 mm

f 6" - 12"

f 14" - 20"

Bulk Density

gm/cm3

1.66 - 1.75

1.65 - 1.75

Specific Resistance

m W-m

5.5 - 7.5

5.5 - 7.5

Flexural Strength

N/mm2

12-17

9 - 15

Young's Modulus

N/mm2

8 - 14

7 - 13

Ash Contents (Max)

%

0.5

0.5

C.T.E. (Longitudinal)

CTE ( x10-7/0C) @ 0- 50 0C

5.0 - 12

5.0 - 12

 

RP

Parameter

Unit

f 150 - 300 mm

f 350 - 500 mm

f 6" - 12"

f 14" - 20"

Bulk Density

gm/cm3

1.56 - 1.65

1.56 - 1.65

Specific Resistance

m W-m

6.0 - 8.0

6.5 - 8.5

Flexural Strength

N/mm2

9 - 12

7 - 11

Young's Modulus

N/mm2

8 - 10

6 - 10

Ash Contents (Max)

%

0.5

0.5

C.T.E. (Longitudinal)

CTE ( x10-7/0C) @ 0- 50 0C

0.5 - 1.2

0.5 - 1.2

 

NOTE: These are Typical Values & are subjected to change without notice

 

SPECIFICATION SHEET FOR CURRENT CARRYING CAPACITIES ( Amps )

Dia. (mm)

RP

HP

UHP-LF

UHP-ACF

UHP-DCF

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

75

----

----

1200

2500

----

----

----

----

----

----

100

----

----

1600

3500

----

----

----

----

----

----

130

----

----

2500

4800

----

----

----

----

----

----

150

3800

5700

4200

6500

----

----

----

----

----

----

175

4300

7400

5000

9000

----

----

----

----

----

----

200

5200

9100

6400

11200

----

----

8000

14000

----

----

225

6500

11700

8000

14400

----

----

10000

18000

----

----

250

8450

14300

10400

17600

----

----

13000

22000

----

----

300

11700

19500

14400

24000

15000

30000

15000

30000

----

----

350

13000

24700

16000

30400

20000

38000

20000

38000

----

----

400

18200

30550

22400

37600

25000

40000

25000

40000

----

----

450

22100

35750

27200

44000

32000

45000

32000

45000

----

----

500

26000

41600

32000

51200

38000

55000

38000

55000

----

----

550

29250

45500

36000

56000

45000

65000

45000

65000

----

----

600

32500

52000

40000

64000

----

----

50000

75000

50000

90000

650

----

----

----

----

----

----

60000

85000

60000

105000

700

----

----

----

----

----

----

70000

100000

70000

120000

 

DIMENSIONAL DETAILS OF ELECTRODES & NIPPLES

 

 

Ⅰ.DIAMETER TOLERANCE & STANDARD NIPPLE SIZES :

 

DIAMETE
R  ( mm )

STANDARD NIPPLE SIZE

DIAMETER TOLERANCE

NOMINAL LENGTH SUPPLIED ( mm )

4 T.P.I. NIPPLE

3 T.P.I. NIPPLE

Maximum

Minimum ( mm )

Low Spot

Dia

Length ( mm )

Dia

Length ( mm )

( mm )

( mm )

( mm )

( mm )

 

 

75

46.04

76.2

-

-

78

73

72

1000, 1200

100

69.85

101.6

-

-

103

98

97

1000, 1200, 1500

130

79.38

127

-

-

132

127

126

1000, 1200, 1500

150

92.08

139.7

-

-

154

149

146

1200, 1500, 1800

175

107.95

165.1

-

-

179

174

171

1200, 1500, 1800

200

122.24

177.8

-

-

205

200

197

1200, 1500, 1800

225

139.7

177.8

-

-

230

225

222

1500, 1800

250

152.4

190.5

155.58

220.1

256

251

248

1500, 1800

300

177.8

215.9

177.17

270.9

307

302

299

1500, 1800, 2100

350

203.2

254

215.9

304.8

357

352

349

1500, 1800, 2100

400

222.25

304.8

215.9

304.8

409

403

400

1500, 1800, 2100, 2400

450

241.3

304.8

241.3

304.8

460

454

451

1500, 1800, 2100, 2400

500

269.88

457.2

273.05

355.6

511

505

502

1800, 2100, 2400, 2700

550

298.45

457.2

298.45

372.5

562

556

553

2100, 2400, 2700

600

317.5

457.2

-

-

613

607

604

2100, 2400, 2700

650

374.65

558.8

-

-

663

657

654

2100, 2400, 2700

700

374.65

558.8

-

-

714

708

705

2100, 2400, 2700

 

Ⅱ.LENGTH TOLERANCE :

 

NOMINAL LENGTH

FULL LENGTH ( mm )

SHORT LENGTH ( mm )

( mm )

Maximum

Minimum

Maximum

Minimum

1000

1050

925

924

800

1200

1350

1100

1099

975

1500

1650

1400

1399

1225

1800

1975

1700

1699

1525

2100

2275

1975

1974

1825

2400

2575

2275

2274

2125

2700

2895

2540

2539

2400

 

DIMENSIONAL DETAILS OF ELECTRODES & NIPPLES

I. DIAMETER TOLERANCE & STANDARD NIPPLE SIZES :

 

DIAMETER
(mm )

STANDARD NIPPLE SIZE

DIAMETER TOLERANCE

NOMINAL LENGTH SUPPLIED ( mm )

4 T.P.I. NIPPLE

3 T.P.I. NIPPLE

Maximum

Minimum ( mm )

Low Spot

Dia( mm )

Length ( mm )

Dia( mm )

Length ( mm )

( mm )

( mm )

75

46.04

76.2

-

-

78

73

72

1000, 1200

100

69.85

101.6

-

-

103

98

97

1000, 1200, 1500

130

79.38

127

-

-

132

127

126

1000, 1200, 1500

150

92.08

139.7

-

-

154

149

146

1200, 1500, 1800

175

107.95

165.1

-

-

179

174

171

1200, 1500, 1800

200

122.24

177.8

-

-

205

200

197

1200, 1500, 1800

225

139.7

177.8

-

-

230

225

222

1500, 1800

250

152.4

190.5

155.58

220.1

256

251

248

1500, 1800

300

177.8

215.9

177.17

270.9

307

302

299

1500, 1800, 2100

350

203.2

254

215.9

304.8

357

352

349

1500, 1800, 2100

400

222.25

304.8

215.9

304.8

409

403

400

1500, 1800, 2100, 2400

450

241.3

304.8

241.3

304.8

460

454

451

1500, 1800, 2100, 2400

500

269.88

457.2

273.05

355.6

511

505

502

1800, 2100, 2400, 2700

550

298.45

457.2

298.45

372.5

562

556

553

2100, 2400, 2700

600

317.5

457.2

-

-

613

607

604

2100, 2400, 2700

650

374.65

558.8

-

-

663

657

654

2100, 2400, 2700

700

374.65

558.8

-

-

714

708

705

2100, 2400, 2700

 

Graphite electrode transportation

1.Graphite electrodes are covered with rainproof tarpaulin during long-distance transportation.

2.When unloading the electrodes packed with wooden cases by hoisting machine, the steel wire rope must be used. The steel packing belt of the electrode shall not be directly hoisted and unloaded.

3.To protect the end face and thread of the electrode, the electrode shall not be transported directly by steel hook to hooking.

4.When loading and unloading joint box, handle with care to prevent thread damage.

Graphite electrode storage

1.The electrodes should be stored in a clean and dry place; Temporarily unused electrodes and nipples do not remove the packaging, to prevent Dust and sundries fall on the thread or inside the electrode hole, which affects the accuracy of the product docking.

2.The electrodes stacked on open fields must be covered with rainproof tarpaulin.

3.Electrodes should be stored neatly in the warehouse ,Both sides of the Electrode stack should be padded , To prevent slippery stack.

4.The stack height of the bulk electrode is usually less than 2.8 meters, The height of the box electrode should not exceed 4 layers.

5.The temperature of the place where the nipples are stored should not be too high to Prevent bituminous nipples from melting.

Operation of graphite electrode connection

1.The wet electrode should be dried before use.

2.Remove the foam protective cap on the alternate electrode holes and check if the inner thread of the electrode holes is intact.

3.Clean the spare electrode surface and hole internal threads with compressed air without oil and water; Avoid cleaning with wire mesh or metal brush emery cloth.

4.The nipples shall be carefully screwing into the electrode hole of the standby electrode end (it is not recommended to install the connector directly into the replaced electrode on the furnace) and the thread shall not be hit.

5.Screw the electrode holder (Graphite lifting spreader is recommended) into the electrode hole at the other end of the standby electrode.

6.Lift the spare electrode upside the standby electrode ,Slowly drop after aligning electrode holes ;Rotating standby electrode ,Turn the screw hook down with the electrode;When the two electrode faces are 10 to 20mm apart ,Clean the exposed parts of the two ends of the electrode and the nipple with compressed air ; At the end of the fully lower electrode, do not overshoot ,Otherwise, the thread of the electrode hole and nipple will be damaged due to violent collision.

7.Use a torque wrench to twist the standby electrode until the ends of the two electrodes are in close contact (The correct crack of electrode andnipple is less than 0.05mm).

Matters needing attention when using graphite electrode

1.The electrode holder shall be clamped outside the warning line of the top electrode,Otherwise, the electrode may be broken easily.The interface between gripper and electrode should be cleaned frequently,To maintain good contact with the electrode ,The clamping device cooling water jacket should avoid leakage.

2.If a crack is found at the electrode joint, the reason should be found out,The connection crack can be removed before use.

3.During electrodes connection , when the nipple pin is found to fall off, the nipple pin should be replaced before connection.

4.Electrodes should be used vertically to avoid tilt operation, especially not horizontally to avoid breaking a set of connected electrodes , to avoid broken .

5.When charging burden into the furnace,Large pieces of material should be loaded near the bottom of the electric furnace , To reduce the collapse of large pieces of burden impact electrode .

6.When smelting, should avoid the insulation material block stack right underof the electrode directly , avoid to affect the electrode using, or even broke the electrode

7.When the electrode is rising or falling, it should avoid touching the furnace cover and lead to the electrode damage .

8.At the smelting site, it is necessary to avoid steel slag splashing onto the thread buckle of the electrode or nipples which stored at the site, thus damaging the precision of the thread.

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Add:North of Xiaopingying Village, Linzhang Town, Linzhang County, Handan City, Hebei Province

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