HP GRAPHITE ELECTRODES – THE DIAMETERS RANGE FROM 200 MM TO 600 MM

Features

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• 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

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• 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.

Specification

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Diameter		Resistance	Density	Flexure Strength	Elastic Modulus	Ash Content	CTE	Current Load	Current Density
		(≤, µΩ·m)	(≥, g/cm3)	(≥, MPa)	(≤, GPa)	(≤, %)	(100 °C – 600 °C)	(A)	(A/cm2)
inch	mm						(≤, 10-6/°C)
8	200	6	1.65	10.5	12	0.3	2.4	5500–9000	18–25
9	225	6	1.65	10.5	12	0.3	2.4	6500–10000	18–25
10	250	6	1.65	10.5	12	0.3	2.4	8000–13000	18–25
12	300	6	1.65	10.5	12	0.3	2.4	13000–17400	17–24
14	350	6	1.65	10.5	12	0.3	2.4	17400–24000	17–24
16	400	6	1.65	10.5	12	0.3	2.4	21000–31000	16–24
18	450	6	1.65	10.5	12	0.3	2.4	25000–40000	15–24
20	500	6	1.65	10.5	14	0.3	2.2	30000–48000	15–24
22	550	6	1.64	10.5	14	0.3	2.2	37000–57000	15–23
24	600	6	1.64	10.5	14	0.3	2.2	44000–67000	15–23

Graphite Electrode Size & Tolerance

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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

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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	30–50
	(< 20 mm should be negligible)	(< 30 mm should be negligible)
Depth (mm)	5–10	10–15
	(< 5 mm should be negligible)	(< 10 mm should be negligible)