Graphite Electrode

Graphite electrodes are essential components primarily employed in electric arc furnaces (EAFs). They possess exceptional electrical conductivity and are uniquely equipped to withstand the extreme temperatures generated during EAF operations, making them indispensable in this process. Additionally, graphite electrodes find utility in refining steel within ladle furnaces and various other smelting techniques. These electrodes are categorized into three types: RP (Regular Power), HP (High Power), and UHP (Ultra High Power).

Physical And Chemical Index For RP Grahpite Electrode

Item			Norminal Diameter(MM)
			75~130		150~225		250~300		350~450		500~800
			A	B	A	B	A	B	A	B	A	B
Electric Resistivity <=	μΩ·m	Electrode	8.5	10	9	10.5	9	10.5	9	10.5	9	10.5
		Nipple	8		8		8		8		8
Bending Strength >=	MPa	Electrode	10		10		8		7		6.5
		Nipple	15		15		15		15		15
Elastic Modulus <=	GPa	Electrode	9.3		9.3		9.3		9.3		9.3
		Nipple	14		14		14		14		14
Bulk Density >=	(g/cm3)	Electrode	1.58		1.53		1.53		1.53		1.52
		Nipple	1.7		1.7		1.7		1.7		1.7
CTE >= (Room temperature to 600℃)	10-6/℃	Electrode	2.9		2.9		2.9		2.9		2.9
		Nipple	2.7		2.7		2.8		2.8		2.8
Ash <=	%		0.5		0.5		0.5		0.5		0.5
Note: Ash content and coefficient of thermal expansion are reference indicators.

Current Carrying Capacity For RP Grahpite Electrode

Noninal Diameter/mm	Current Carrying Capacity/A	Current Density/(A/cm2)
75	1000 to 1400	22 to 31
100	1500 to 2400	19 to 30
130	2200 to 3400	17 to 26
150	3000 to 4500	16 to 25
200	5000 to 6900	15 to 21
250	7000 to 10000	14 to 20
300	10000 to 13000	14 to 18
350	13500 to 18000	14 to 18
400	18000 to 23500	14 to 18
450	22000 to 27000	13 to 17
500	25000 to 32000	13 to 16
550	28000 to 34000	12 to 14
600	30000 to 36000	11 to 13
650	32000 to 39000	10 to 12
700	34000 to 42000	9 to 11

Physical And Chemical Index For HP Grahpite Electrode

Item			Norminal Diameter(MM)
Item			200~400	450~500	550~700
Electric Resistivity <=	μΩ·m	Electrode	7	7.5	7.5
Electric Resistivity <=	μΩ·m	Nipple	6.3	6.3	6.3
Bending Strength >=	MPa	Electrode	10.5	10	8.5
Bending Strength >=	MPa	Nipple	17	17	17
Elastic Modulus <=	GPa	Electrode	14	14	14
Elastic Modulus <=	GPa	Nipple	16	16	16
Bulk Density >=	(g/cm3)	Electrode	1.6	1.6	1.6
Bulk Density >=	(g/cm3)	Nipple	1.72	1.72	1.72
CTE >= (Room temperature to 600℃)	10-6/℃	Electrode	2.4	2.4	2.4
CTE >= (Room temperature to 600℃)	10-6/℃	Nipple	2.2	2.2	2.2
Ash <=	%		0.5	0.5	0.5
Note: Ash content is reference indicator.

Current Carrying Capacity For HP Grahpite Electrode

Noninal Diameter/mm	Current Carrying Capacity/A	Current Density/(A/cm2)
200	5500 to 9000	18 to 25
225	6500 to 10000	18 to 25
250	8000 to 13000	18 to 25
300	13000 to 17400	17 to 24
350	17400 to 24000	17 to 24
400	21000 to 31000	16 to 24
450	25000 to 40000	15 to 24
500	30000 to 48000	15 to 24
550	34000 to 53000	14 to 22
600	38000 to 58000	13 to 21
650	41000 to 65000	12 to 20
700	45000 to 72000	12 to 19

Physical And Chemical Index For UHP Grahpite Electrode

Item			Norminal Diameter(MM)
Item			300~400	450~500	550~650	700~800
Electric Resistivity <=	μΩ·m	Electrode	6.2	6.3	6	5.8
Electric Resistivity <=	μΩ·m	Nipple	5.3	5.3	4.5	4.3
Bending Strength >=	MPa	Electrode	10.5	10.5	10	10
Bending Strength >=	MPa	Nipple	20	20	22	23
Elastic Modulus <=	GPa	Electrode	14	14	14	14
Elastic Modulus <=	GPa	Nipple	20	20	22	22
Bulk Density >=	(g/cm3)	Electrode	1.67	1.66	1.66	1.68
Bulk Density >=	(g/cm3)	Nipple	1.74	1.75	1.78	1.78
CTE >= (Room temperature to 600℃)	10-6/℃	Electrode	1.5	1.5	1.5	1.5
CTE >= (Room temperature to 600℃)	10-6/℃	Nipple	1.4	1.4	1.3	1.3
Ash <=	%		0.5	0.5	0.5	0.5
Note: Ash content is reference indicator.

Current Carrying Capacity For UHP Grahpite Electrode

Noninal Diameter/mm	Current Carrying Capacity/A	Current Density/(A/cm2)
300	15000 to 22000	20 to 30
350	20000 to 30000	20 to 30
400	25000 to 40000	19 to 30
450	32000 to 45000	19 to 27
500	38000 to 55000	18 to 27
550	45000 to 65000	18 to 27
600	50000 to 75000	18 to 26
650	60000 to 85000	18 to 25
700	70000 to 120000	18 to 30