RP GRAPHITE ELECTRODE

Regular-power graphite electrode(RP) is processed by pressing, roasting, impregnating and graphitizing processes with high-quality petroleum coke, asphalt. It has high flexural strength, good seismic performance, and small consumption. It is widely used in electric arc furnaces of steel company, and silicon company and so on.

Technical Quota of Graphite Electrodes

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

The Form ﹠Size of Cone Nipple

Item	Nominal diameter(mm)	IEC	Nipple		Nipple hole		Thread pitch
			Nipple		Nipple hole
			d	L	D1	S
			d	L	D1	S
RP/HP/UHP Graphite Electrodes	225	139T3N	139.70	203.20	131.27	107.60	8.47
	250	155T3N	155.57	220.00	147.14	116.00
	300	177T3N	177.16	270.90	168.73	141.50
	350	215T3N	215.90	304.80	207.47	158.40
	400	215T3N	215.90	304.80	207.47	158.40
	400	241T3N	241.30	338.70	232.87	175.30
	450	241T3N	241.30	338.70	232.87	175.30
	450	273T3N	273.05	355.60	264.62	183.80
	500	273T3N	273.05	355.60	264.62	183.80
	500	298T3N	298.45	372.60	290.02	192.20
	550	298T3N	298.45	372.60	290.02	192.20
RP/ HP Graphite Electrodes	75	46T4N	46.04	76.20	39.72	44.10	6.35
	100	69T4N	69.85	101.60	63.53	56.80
	130	79T4N	79.38	127.00	73.06	69.50
	150	92T4N	92.08	139.70	85.76	75.90
	200	122T4N	122.24	177.80	115.92	94.9
	225	139T4N	139.70	177.80	133.38	94.90
	250	152T4N	152.40	190.50	146.08	101.30
RP/HP/UHP Graphite Electrodes	300	177T4N	177.80	215.90	171.48	114.00
	350	203T4N	203.20	254.00	196.88	133.00
	400	222T4N	222.25	304.80	215.93	158.40
	400	222T4L	222.25	355.60	215.93	183.80
	450	241T4N	241.30	304.80	234.98	158.40
	450	241T4L	241.30	355.60	234.98	183.80
	500	269T4N	269.88	355.60	263.56	183.80
	500	269T4L	269.88	457.20	263.56	234.60
	550	298T4N	298.45	355.60	292.13	183.80
	550	298T4L	298.45	457.20	292.13	234.60
	600	317T4N	317.50	355.60	311.18	183.80
	600	317T4L	317.50	457.20	311.18	234.60
	700	374T4N	374.65	457.20	368.33	234.60
	700	374T4L	374.65	558.80	368.33	285.40