UHP Graphite Electrode

Needle coke and pitch are mixed and then molded. Heat treatment is then applied in the baking and graphitization process to form the finished product.

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UHP Graphite Electrode

The production process for UHP grade:

Needle coke and pitch are mixed and then molded. Heat treatment is then applied in the baking and graphitization process to form the finished product.

Physical & Chemical Properties of UHP Graphite Electrodes

Items	Classification	Unit	Nominal Diameter (mm)
Items	Classification	Unit	250-400	450-500	550-650	700-800
Resistivity	Electrode	μΩm ≤	6.2	6.3	6.0	5.8
Resistivity	Nipple	μΩm ≤	5.3	5.3	4.5	4.3
Bending Strength	Electrode	Mpa ≥	10.5	10.5	10.0	10.0
Bending Strength	Nipple	Mpa ≥	20.0	20.0	22.0	23.0
Young’s Modulus	Electrode	Gpa ≤	14.0	14.0	14.0	14.0
Young’s Modulus	Nipple	Gpa ≤	20.0	20.0	22.0	22.0
Bulk Density	Electrode	g/cm3 ≥	1.67	1.66	1.66	1.68
Bulk Density	Nipple	g/cm3 ≥	1.74	1.75	1.78	1.78
CTE（100℃-600℃）	Electrode	×10^-6/℃ ≤	1.5	1.5	1.5	1.5
CTE（100℃-600℃）	Nipple	×10^-6/℃ ≤	1.4	1.4	1.3	1.3
Ash Content	Electrode	% ≤	0.5	0.5	0.5	0.5
Ash Content	Nipple	% ≤	0.5	0.5	0.5	0.5

Note: Ash Content is only for reference.

Recommended current load of UHP Graphite Electrodes

Grade	Nominal Dia.	Allowable current A		Current density A/cm2
UHP electrode		AC	DC	AC	DC
	300mm	15000～22000		20～30
	350mm	20000～30000	-	20～30	-
	400mm	25000～40000	-	19～30	-
	450mm	32000～45000	-	19～27	-
	500mm	38000～55000	-	18～27	-
	550mm	45000～65000	49000～78000	18～27	20～32
	600mm	50000～75000	58000～93000	18～26	20～32
	650mm	60000～85000	60000～110000	18～25	20～30
	700mm	70000～120000	79000～130000	18～30	20～30

Specifications of Regular Power Graphite Electrodes

Item		Unit	Nominal Diameter (mm)
Item		Unit	75-130	150-225	250-300	350-500
Specific Resistance Max	Electrode	μO · m	8.5	9.0	9.0	9.5
Specific Resistance Max	Nipple	μO · m	8.5	8.5	8.5	8.5
Transverse strength Min	Electrode	MPa	9.8	9.8	7.8	6.4
Transverse strength Min	Nipple	MPa	13.0	13.0	13.0	13.0
Elastic modulus Max	Electrode	GPa	9.3	9.3	9.3	9.3
Elastic modulus Max	Nipple	GPa	14.0	14.0	14.0	14.0
Bulk density Min	Electrode	g/cm 3	1.58	1.52	1.52	1.52
Bulk density Min	Nipple	g/cm 3	1.63	1.63	1.68	1.68
C.T.E Max	Electrode	10 -6 /°C	2.9	2.9	2.9	2.9
C.T.E Max	Nipple	10 -6 /°C	2.7	2.7	2.8	2.8
Ash Max	Electrode	%	0.5	0.5	0.5	0.5
Ash Max		%	0.5	0.5	0.5	0.5

Specifications of High Density Graphite Electrodes

Item		Unit	Nominal Diameter (mm)
Item		Unit	75-200	225-300	350-500
Specific Resistance Max	Electrode	μO · m	8.0	8.0	8.0
Specific Resistance Max	Nipple	μO · m	7.5	7.5	7.5
Transverse strength Min	Electrode	MPa	9.8	9.8	7.8
Transverse strength Min	Nipple	MPa	13.0	13.0	13.0
Elastic modulus Max	Electrode	GPa	12.0	12.0	12.0
Elastic modulus Max	Nipple	GPa	14.0	14.0	14.0
Bulk density Min	Electrode	g/cm 3	1.58	1.58	1.56
Bulk density Min	Nipple	g/cm 3	1.68	1.68	1.68
C.T.E Max	Electrode	10 -6 /°C	2.7	2.7	2.7
C.T.E Max	Nipple	10 -6 /°C	2.5	2.5	2.5
Ash Max	Electrode	%	0.3	0.3	0.3
Ash Max	Nipple	%	0.3	0.3	0.3

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