Graphite Electrodes

The graphite electrodes are primarily used to carry the electricity that melts scrap iron and steel in electric arc furnaces. As an increasing proportion of global steel is made using electric arc furnace, the secondary production of steel becomes the major consumption of graphite electrodes. Additionally, the graphite electrode is also used in melting products in smelting furnaces, non-ferrous metals, ceramic products, and even waste recycling industry.

According to the furnace and smelting production requirements, graphite electrodes are produced with different power designs which are regular power, high power and ultra-high power, and machined to diameter from 75mm up to 800mm and length up to 2900mm,

Sample:

HP Grade Graphite Electrodes HP-200

Specification:

Electrode Nipple

Diameter 201-205mm 122.24mm

Length 1800+/-100mm 177.80mm

Electrical Resistance (max.) 6.5μΩ-m 5,5μΩ-m

Bending Strength (min.) 12,0MPa 14,0MPa

Elastic modulus (max.) 12,0GPa 14,0GPa

Bulk Density 1,72g/cm 3 1,78g/cm 3

CTE (max.) 2,5x10 -6 /C 2,2x10 -6 /C

Ash (max.) 0,3% 0,3%

ITEM		UNIT	RP	HP	UHP
ITEM		UNIT	3-24inch φ75-600mm	4-24inch φ300-600mm	12-20inch φ300-500mm	22-28inch φ550-700mm
Resistivity	Electrode	μΩ·m	7.0-9.0	5.5-6.5	4.8-5.8	4.5-5.5
Resistivity	Nipple	μΩ·m	4.0-4.5	3.5-4.0	3.0-4.0	2.5-3.5
Bending stregth	Electrode	Mpa	8.0-12.0	10.0-14	10.0-15.0	12.0-16.0
Bending stregth	Nipple	Mpa	19.0-22.0	20.0-23.0	20.0-24.0	22.0-25.0
Elastic Modulus	Electrode	Gpa	7.0-11.0	80.-12.0	9.0-13.0	10.0-14.0
Elastic Modulus	Nipple	Gpa	12.0-14.0	14.0-16.0	15.0-18.0	16.0-19.0
Bulk density	Electrode	g/cm3	1.60-1.65	1.68-1.72	1.70-1.75	1.70-1.75
Bulk density	Nipple	g/cm3	1.75-1.8	1.85-1.8	1.78-1.82	1.8-1.85
Ash	Electrode	%	0.3	0.3	0.2	0.2
Ash	Nipple	%	0.3	0.3	0.2	0.2
CTE	Electrode	10-6/℃ 100-600℃	2.0-2.4	1.6-1.9	1.1-1.4	1.1-1.4
CTE	Nipple	10-6/℃ 100-600℃	1.8-2.2	1.1-1.4	0.9-1.2	0.9-1.2

Graphite electrodes allow current loading and current density

Item	Nominal diameter(mm)	Allowed current load（A）	Current density（A/cm2）
RP Graphite Electrodes	100	1500～2400	19～30
	150	3500～4900	20～28
	200	5000～6900	16～22
	250	7000～10000	14～20
	300	10000～13000	14～18
	350	13500～18000	14～18
	400	18000～23500	14～18
	450	22000～27000	13～17
	500	25000～32000	13～16
	600	35000～41000	13～15
HP Graphite Electrodes	300	13000～17400	17～24
	350	17400～24000	17～24
	400	21000～31000	16～24
	450	25000～40000	15～24
	500	30000～48000	15～24
UHP Graphite Electrodes	300	15000～22220	20～32
	350	20000～30300	20～32
	400	25000～40400	19～32
	450	32000～45450	19～29
	500	38000～55550	18～29
	550	42000～64640	17～28
	600	50000～76760	17～27
	700	67000～101000	17～27

Specifications ﹠Allowance of Graphite Electrodes

Diameter mm				Length mm
Nominal Diameter		Actual Diameter		Nominal Length		Tolerance
mm	inch	max (mm)	min （mm）	mm	inch	Nominal Length（mm）	Short Length（mm）
200	8	205	200	160 1800 2100	60 72 84	±100	-275
250	10	256	251
300	12	307	302
350	14	357	352
400	16	409	403	1800 2100 2400 2700	72 84 96 108
450	18	460	454
500	20	511	505
600	24	613	607
700	28	713	707