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Graphite electrodes, joints

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Graphite electrode, joint index

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Processing of special shaped graphite products

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Graphite electrode, joint index

Graphite electrode standard size

Specifications(inch)

 Allowable Diameter(mm)   Allowable Length(mm)

Nominal Diameter

 Max. Min. Nominal Length Max. Min.
12 300 307 302 1800 1875 1700
14 350 357 352 1600 1700 1500
1800 1875 1700
16 400 409 403 1600 1500 1500
1800 1875 1700
2100 2175 1975
18 450 460 454 1800 1875 1700
2100 2175 1975
2400 2475 2275
20 500 511 505 1800 1875 1700
2100 2175 1975
2400 2475 2275
22 550 562 556 2100 2175 1975
2400 2475 2275
24 600 613 607 2100 2175 1975
2400 2475 2275
2800 2850 2550
26 650 663 657 2400 2475 2275
28 700 714 708 2400 2475 2275
2800 2850 2550

If there are special specification requirements,both sides consult supply and demand.

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Standard Sizes for Fittings and Holes

Nominal 
Electrode Diameter 
(mm) (inch)		 Thread
Designation		 Diameter Max.
(mm)		 Length Max.
(mm)		 Depth of 
socket Min.
(mm)		 Average
Weight(kg)		 Other Designation
IEC Diamejer Length
3TPI
（Pich of Thread:
8.467mm）		 300 12 10T3 155.57 220.00 116.00 5.0 N155T3N 6.125 8.66
12T3 177.16 270.90 141.50 8.2 N177T3N 6.975 10.66
350 14 12T3 177.16 270.90 141.50 8.2 N177T3N 6.975 10.66
14T3 215.9 0 304.80 158.40 14.5 N215T3N 8.5 12
14T3L 215.9 0 355.60 183.80 17.0 N215T3L 8.5 14
400 16 14T3 215.9 0 304.80 158.40 14.5 N215T3N 8.5 12
14T3L 215.9 0 355.60 183.80 17.0 N215T3L 8.5 14
16T3 241.30 338.70 175.30 20.5 N241T3N 9.5 13.33
16T3L 241.30 355.60 183.80 21.0 N241T3L 9.5 14
450 18 16T3 241.30 338.70 175.30 20.5 N241T3N 9.5 13.33
16T3L 241.30 355.60 183.80 21.0 N241T3L 9.5 14
18T3 273.05 355.60 183.80 28.0 N273T3N 10.75 14
18T3L 273.05 457.20 234.60 34.0 N273T3L 10.75 18
500 20 18T3 273.05 355.60 183.80 28.0 N273T3N 10.75 14
18T3L 273.05 457.20 234.60 34.0 N273T3L 10.75 18
20T3 298.45 372.50 192.20 36.0 N298T3N 11.75 14.66
4TPI
(Pitch of Thread:
6.350mm)		 300 12 12T4 177.80 215.90 114.00 7.2 N177T4N 7 8.5
350 14 14T4 203.20 254.00 133.00 11.2 N203T4N 8 10
400 16 16T4 222.25 304.80 158.40 15.5 N222T4N 8.75 12
16T4L 222.25 355-60 183.80 17.4 N222T4L 8.75 14
18T4 241.30 304.80 158.40 19.0 N241T4N 9.5 12
18T4L 241.30 355.60 183.80 21.0 N241T4L 9.5 14
450 18 18T4 241.30 304.80 158.40 19.0 N241T4N 9.5 12
18T4L 241.30 355.60 183.80 21.0 N241T4L 9.5 14
20T4L 269.88 457.20 234.60 33.4 N269T4N 10.625 18
500 20 20T4 269.88 355.60 183.80 27.2 N269T4N 10.625 14
20T4L 269.88 457.20 234.60 33.4 N269T4N 10.625 18
550 22 22T4 298.45 355.60 183.80 35.0 N298T4N 11.75 14
22T4L 298.45 457.20 234.60 42.5 N298T4L [11.75 18
600 24 24T4 317.50 355.60 183.80 40.0 N317T4N 12.5 14
24T4L 317.50 457.20 234.60 48.0 N317T4L 12.5 18
650 26 26T4 355.60 457.20 234.60 64.0 N355T4N 14 18
26T4L 355.60 558.80 285.40 74.0 N355T4L 14 22
700 28 28T4 374.65 457.20 234.60 71.5 N374T4N 14.75 18
28T4L 374.65 558.80 285.40 84.0 N374T4L 14.75 22

International Electrotechnical Commission

If there are special specification requirements,both sides consult supply and demand.

 

UHP graphite electrode characteristic index

                    Applicable Furmace
Property                                
                    Diameter

 AC Furnace DC Furnace
300-400mm
12"～16"		 450-500mm
18"～20"		 550-600mm
22"～24"		 650-700mm
24"～28"
Bulk Density g/cm³ 1.65～1.76 1.64～1.75 1.64～1.75 1.64～1.75
Specific Resistance μΩM 4.2～6.0 4.2～6.0 4.2～6.0 4.2～5.5
Elastic Modulus Gpa 7～14 7～14 7～14 7～14
kgf/mm² 700～1,400 700～1,400 700～1,400 700～1,400
Flexural Strength MPa 10.5～15 10～15 10～15 10～15
kgf/cm² 105～150 100〜150 100-150 100～150
N/cm² 1,050～1,500 1,000～1,500 1,000～1,500 1,000～1,500
Coefficient Of Thermal
Expansion (R.T.≤600℃)		 X10~-6/℃ 1.0～1.5 1.0～1.5 1.0～1.5 1.0～1.4
Real Density g/cm³ 2.20～2.23 2.20～2.23 2.20～2.23 2.20～2.23
Porosity % 20～26 20～27 20～27 20～27
Ash Content % ≤0.2 ≤0.2 ≤0.2 ≤0.2

 

Selection of UHP graphite electrode size

Current Capacity Of UHP Graphite Electrodes
Specifications Current Capacity(A) Current Density(A/cm²)
(inch) (mm) AC DC AC DC
12 300 18,000-32,000 - 24-43 -
14 350 22,000-39,000 - 22-39 -
16 400 28,000-47,000 - 21-36 -
18 450 34,000-55,000 - 21-33 -
20 500 41,000-63,000 - 20-31 -
22 550 48,000-70,000 65,000-78,000 19-28 26-32
24 600 55,000-80,000 75,000-90,000 19-27 26-31
W 650 69,000-89,000 87,000-104,000 20-26 25-30
28 700 80,000-100,000 100,000-120,000 20-25 25-30

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Joint characteristic index

Specification ≤φ400 φ450-500 φ550 φ600-700
Specific Resistance (μΩM ) ≤4.0 ≤3.8 ≤3.6 ≤3.6
Flexural Strength (MPa) 18-24 17-25 20-28 20-28
astic Modulus (GPa) ≤18 ≤18 ≤18 ≤18
Bulk Density (g/cm³) 1.76-1.84 1.78-1.84 1.79-1.86 1.79-1.86
Coefficient Of Thermal Expansion (106/℃) 0.9-1.3 0.9-1.2 0.9-1.1 0.9-1.1
Ash Content (%) ≤0.3 ≤0.3 ≤0.3 ≤0.3