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HP Graphite Electrode – the Conductive Material in Arc Furnace Smelting

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DESCRIPTION
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.
A close up picture about the electric arc furnace smelting process.Graphite electrode for submerged arc furnace
Graphite electrodes are used in alternating current electric arc furnace steelmaking.Graphite electrode for AC arc furnace
Graphite electrodes are used in direct current electric arc furnace steelmaking.Graphite electrode for DC arc furnace
SPECIFICATION
Table 1: Technical Specification of HP Graphite Electrode
Diameter Resistance
(≤, μ?·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)
inch mm
8 200 6.5 1.62 10.5 12 0.3 2.4 5500–9000 18–25
9 225 6.5 1.62 10.5 12 0.3 2.4 6500–10000 18–25
10 250 6.5 1.62 10.5 12 0.3 2.4 8000–13000 18–25
12 300 6.5 1.62 10.5 12 0.3 2.4 13000–17400 17–24
14 350 6.5 1.62 10.5 12 0.3 2.4 17400–24000 17–24
16 400 6.5 1.62 10.5 12 0.3 2.4 21000–31000 16–24
18 450 6.5 1.60 9.8 12 0.3 2.4 25000–40000 15–24
20 500 6.5 1.60 9.8 12 0.3 2.4 30000–48000 15–24
22 550 6.5 1.60 9.8 12 0.3 2.4 37000–57000 15–23
24 600 6.5 1.60 9.8 12 0.3 2.4 44000–67000 15–23
Table 2: Graphite Electrode Size & Tolerance
Diameter (mm) Length (mm)
Nominal Diameter Actual Diameter Nominal Length Tolerance Short Length
(inch) (mm) (max.) (min.) (rough spot)
8 200 205 200 197 1600 ±100 -275
9 225 230 225 222 1600
10 250 256 251 248 1600/1800
12 300 307 302 299 1600/1800
14 350 357 352 349 1600/1800
16 400 409 403 400 1600/1800/2000/2200
18 450 460 454 451 1600/1800/2000/2200
20 500 511 505 502 1800/2000/2200/2400
22 550 562 556 553 1800/2000/2200/2400
24 600 613 607 604 2000/2200/2400
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.
SpecificationDefect Dimension Nominal Diameter of Graphite Electrode (mm)
300–400 450–600
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) 10–15
(< 10 mm should be negligible)
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