Graphite electrode with preset nipple

Graphite Electrodes

Graphite electrodes are used for the recycling of steel in the electric arc furnace industry, so called "mini-mills." We do not simply provide graphite electrodes and connecting pins as standalone products to our customers. Rather, the focus is on the delivery of an entire "product system", supported by sales and technical experts from the receipt of the customer's order, throughout the entire production process, to final consumption in the steel plants.

Super long Graphite Electrode:

In the past the maximum electrode length supplied by SGL Group was 2,900 mm. SGL Group’s new fully integrated graphite facility in Banting (Malaysia) is capable of producing electrodes up to a length of 3,800 mm. The “super long” graphite electrodes provide the following advantages for each customer:

  • Less jointing due to longer electrodes - therefore fewer joint issues
  • Decrease of electrode jointing time due to fewer joints leading to increased productivity
  • Less electrode columns in parking position will yield less oxidation and graphite losses
  • Lower production costs resulting from increased number of heats between electrode additions

For details about the supply please contact your individual sales contact.

Properties and Characteristics - Matching your needs

The graphite electrode load diagram shows mean values based on our experience. Precise evaluation is only possible under specific furnace conditions.

Current Carrying Capacity



Simulation left: Current density in bottom joint Simulation right: Temperature inside electrode tip after high current load

Graphite electrodes from SGL Group are designed for increased productivity and customer value. Our continuous improvements in material properties as well as increased dimensions provide the customer the benefit of applying higher current loads.

Nominal-
Diameter
Full ToleranceNominal Length
Lower ToleranceUpper Tolerance
mm Inch
min.
mm
max.
mm
min.
mm
max.
mm
mm Inch
350 14 352 355 355 359
1500, 1800,
2100
2400
60, 72, 84

96
400 16 403 406 406 409
1500, 1800,
2100
2400
60, 72, 84

96
450 18 454 457 457 460 1800, 2100,
2400
72, 84, 96

500 20 505 508 508 511
1800, 2100,
2400
2700
72, 84, 96

110
550 22 556 558 558 562 2100, 2400,
2700
84, 96, 110

600 24 607 609 609 613
1500, 2100,
2400
2700
60, 84, 96

110
650 26 657 660 660 663 2100, 2400,
2700
84, 96, 110

700 28 708 711 711 714 2100, 2400,
2700
84, 96, 110

750 30 759 762 762 765 2400, 2700 96, 110
800 32 810 812 812 816 2400, 2700 96, 110

SGL Group electrodes and nipples are machined according to internal standards (derived from international standards IEC 239, NEMA, JIS).

NominalFull Tolerance
Lower ToleranceUpper Tolerance
mm Inch min. mm max. mm min. mm max. mm
1500 60 1400 1510 1511 1610
1800 72 1689 1790 1791 1915
2100 84 1969 2095 2096 2220
2400 96 2273 2399 2400 2525
2700 110 2526 2704 2705 2906

Diameter SIGRA-LFMELT
mm350 - 450350 - 450500 - 650700 - 800
inches14 - 1814 - 1820 - 2628 - 32
Apparent
Density
g/cm3 1.63 - 1.72 1.66 - 1.76 1.67 - 1.77 1.68 - 1.77

Specific
Electrical
Resistivity

μΩm 4.9 - 7.5 4.9 - 5.7 4.5 - 5.5 4.0 - 5.5
Flexural
Strength
N/mm2 9-15 8-13 10-13 10-13
Thermal
Conductivity
W/(K.m) 160 - 210 220 - 270 250 - 280 250 - 300
Coefficient of
Thermal
Expansion


μm/(K.m)


0.7 - 1.8


0.3 - 0.7


0.3 - 0.6


0.3 - 0.6

 

All values measured parallel to extrusion direction. Graphite electrodes from SGL Group are produced with a high degree of purity so as to have no adverse effect on the refining of steel.

A sufficiently high and well-defined torque is essential to ensure the proper performance of the electrode joint. For diameters exceeding 450 mm / 18 inches, mechanical joining with torque control by a hydraulic assembly station or robot joining is highly recommended.

For details please refer to the brochure in the download section or contact directly the technical service responsible.

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