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Graphite Electrodes HD 500-700 mm

Jul 14, 2020 Source: DanCarbon Writer: Yvonne

Graphite electrodes HD 500 - 700 mm are made of mixed petroleum coke and coal pitch, to be extruded, baked, impregnated, graphitized and machined for use as conductive material on EAF (Electric Arc Furnace) and LF (Ladle Furnace) for steelmaking.
In the steelmaking process, the EAF method recycles used iron scrap by melting it at a temperature of about 1600 ℃ in an electric arc furnace. Graphite electrodes, a kind of conductor, are an essential component in this kind of furnace.
Standards
IEC 60239 Graphite electrodes for electric arc furnaces – Dimensions and designation
YB/T 142-2012 High Density graphite electrode
Properties
Property Unit Electrode Diameter
HD
500 ~700 mm
(14~18 inch)
Bulk Density g/cm3 1.64 ~ 1.72
Specific Resistance μΩm 5.8 ~ 7.3
Flexural Strength MPa 10.0 ~ 15.0
Elastic Modulus GPa 9.0 ~ 12.0
Coefficient of
Thermal Expansion
×10-6/°C 1.9 ~ 2.3
Ash Content % Less than 0.2
Diameters and Lengths of Electrodes

Nominal

Diameter

Actual Diameter Specifications

Nominal

Length

Actual Length Specifications for Normal Electrodes

Actual Length Specifications for Short Electrodes

Max

Min

Max

Min

Max

Min

mm

(inch)

mm

mm

mm

mm

mm

mm

mm

500

(20)

511

505

1800

1900

1700

1700

1525

2100

2200

2000

2000

1825

2400

2500

2300

2300

2125

550

(22)

562

556

2100

2300

1950

1950

1800

2400

2600

2250

2250

2100

2700

2900

2550

2550

2400

600

(24)

613

607

2100

2300

1950

1950

1800

2400

2600

2250

2250

2100

2700

2900

2550

2550

2400

650

(26)

663

659

2400

2600

2250

2250

2100

2700

2900

2550

2550

2400

3000

3200

2850

2850

2700

700

(28)

714

710

2400

2600

2250

2250

2100

2700

2900

2550

2550

2400

3000

3200

2850

2850

2700

Notes:

1.      A low spot may be accepted only if the diameter measured at the low sport is not more than 3 mm below the min diameter specification.

2.      Each shipment contain 5% short electrodes may be accepted unless the acceptable percentage of short electrodes per delivery is decided by agreement between the supplier and user.

Dimensions of Pins and Sockets (T3)
Nominal
Diameter of Electrodes
IEC
Designation of Joint
Pin Socket
Major Diameter Pitch Diameter Length Minor Diameter Pitch Diameter Depth
d1 d2 l1 d3 d4 l2
mm (inch) Type T3 mm mm mm mm mm mm
500 (20) 273T3N 273.05 268.84 355.60 264.62 268.84 183.80
500 (20) 298T3N 298.45 294.24 372.60 290.02 294.24 192.20
550 (22) 298T3N 298.45 294.24 372.60 290.02 294.24 192.20
Notes:
  1. Type T3 is 3 taper threads per inch, pitch 8.47 mm.
  2. Pin pitch diameter is equal to socket pitch diameter (d2 = d4).
  3. Socket minor diameter is equal to pitch diameter (d3 = d4 – 4.22).
Dimensions of Pins and Sockets (T4)Nominal

Diameter of Electrodes

IEC

Designation of Joint

Pin

Socket

Major Diameter

Pitch Diameter

Length

Minor Diameter

Pitch Diameter

Depth

d1

d2

l1

d3

d4

l2

mm

(inch)

Type T4

mm

mm

mm

mm

mm

mm

500

(20)

269T4N

269.88

266.72

355.60

263.56

266.72

183.80

500

(20)

269T4L

269.88

266.72

457.20

263.56

266.72

234.60

550

(22)

298T4N

298.45

295.29

355.60

292.13

295.29

183.80

550

(22)

298T4L

298.45

295.29

457.20

292.13

295.29

234.60

600

(24)

317T4N

317.50

314.34

355.60

311.18

314.34

183.80

600

(24)

317T4L

317.50

314.34

457.20

311.18

314.34

234.60

650

(26)

355T4N

355.60

352.44

457.20

349.28

352.44

234.60

650

(26)

355T4L

355.60

352.44

558.80

349.28

352.44

285.40

700

(28)

374T4N

374.65

371.49

457.20

368.33

371.49

234.60

700

(28)

374T4L

374.65

371.49

558.80

368.33

371.49

285.40

Notes:

1.      Type T4 is 4 taper threads per inch, pitch 6.35 mm.

2.      Pin pitch diameter is equal to socket pitch diameter (d2 = d4).

3.      Socket minor diameter is equal to pitch diameter (d3 = d4 – 3.16).

Tolerances for Sockets and Pins
Dimension Tolerances for Sockets and Pins
(tolerance in brackets are informative only)
Min Max
(mm) (mm)
Length of pin l1 (-4) 0
Depth of socket l2 -3 (+10)
Length of thread l3 -2 (+8)
Recess of pin l4 0 +10
Recess of socket l5 0 +4
Pitch diameter of pin d2 (-1) 0
Pitch diameter of socket d4 0 (+0.5)
Designation
Electrodes shall be designated by the nominal diameter, the nominal length and the socket designation.
EXAMPLE 1 Designation of electrodes with normal sockets:
350 × 2100 × 203T4N
EXAMPLE 2 Designation of electrodes with long sockets:
400× 2100 × 222T4L

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