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Description Of HP Graphite Electrode

HP graphite electrode is the conducting element for electric arc furnaces steelmaking. It is made of petroleum coke, needle coke, coal pitch and produced by a series of strict production processes. High-current lines insert through the graphite electrode port inside the furnace body. This will releases electric energy in the arc furnace to heat the furnace.

The demand for the larger diameter electrodes has been increasing as EAF furnace sizes become larger. Graphite electrodes with diameter of 500 mm or 600 mm have become increasingly popular in recent years.

FEATURE

  • Anti-oxidation treatment for longevity.

  • High-purity, high-density, strong chemical stability.

  • High machining accuracy, good surface finishing.

  • High mechanical strength, low electrical resistance.

  • Resistant to cracking & spalling.

  • High resistance to oxidation and thermal shock.

APPLICATION

Graphite electrodes are widely used for production of alloy steels, metal and other nonmetallic materials, etc.

  • DC electric arc furnace.

  • AC electric arc furnace.

  • Submerged arc furnace.

the application of hp graphite electrode in submerged electric furnace
the application of hp graphite electrode in ac arc furnace
the application of hp graphite electrode in dc arc furnace

SPECIFICATION

Table 1: Technical Specification of HP Graphite Electrode

Dia.(inch)Resistance (≤, µΩ·m)Density (≥, g/cm³)Flexure Strength (≥, MPa)Elastic Modulus (≤, GPa)Ash Content (≤, %)CTE (100 °C – 600 °C) (≤, 10-6/°C)Current Load (A)Current Density (A/cm²)
86.51.6210.5120.32.45500-900018-25
96.51.6210.5120.32.46500-1000018-25
106.51.6210.5120.32.48000-1300018-25
126.51.6210.5120.32.413000-1740017-24
146.51.6210.5120.32.417400-2400017-24
166.51.6210.5120.32.421000-3100016-24
186.51.609.8120.32.425000-4000015-24
206.51.609.8120.32.430000-48000015-24
226.51.609.8120.32.437000-5700015-23
246.51.609.8120.32.444000-6700015-23

Table 2: Graphite Electrode Size & Tolerance

Diameter (mm)Length (mm)
Nominal DiameterActual DiameterNominal LengthToleranceShort Length
(inch)(mm)(max.)(min.)(rough spot)±100-275
82002052001971600
92252302252221600/1800
102502562512481600/1800
123003073022991600/1800
143503573523491600/1800
164004094034001600/1800/2000/2200
184504604544511600/1800/2000/2200
205005115055021800/2000/2200/2400
225505625565531800/2000/2200/2400
246006136076042000/2200/2400

SURFACE QUALITY

  • There should be less than two defects or holes on the electrode surface, the maximum size of which is mentioned in the below chart.

  • There should be no transverse crack on the electrode surface. For the longitudinal crack, the length should be less than 5% of the electrode circumference and the width should be 0.3 to 1.0 mm.

  • The width of black area on electrode surface should be less than 1/10 of the electrode circumference and the length should be less than 1/3 of the electrode.

Specification of Defect Dimension

Defect DimensionNominal Diameter of Graphite Electrode (mm)
Specification
300–400450–600
Diameter (mm)20–40
(< 20 mm should be negligible)
30–50
(< 30 mm should be negligible)
Depth (mm)5–10
(< 5 mm should be negligible)
(< 10 mm should be negligible)

DOWNLOAD

File NameLast UpdateFile SizeDownload
JINSH Graphite Electrode Catalog2019.8.233.0MB