graphite electrode

Technical Properties of Graphite Electrodes
YB4088-92 QBJ/LT06-17

Items			Unit	NoMin..al Diameter(mm)
				Regular Power				Impregnated Electrodes
				75-130	150-200	250-350	400-500	150-500
Resistivity	Max..	Electrode Nipple		8.5	9.0	9.0	9.0	8
Resistivity	Max..	Electrode Nipple		8.5	8.5	8.5	8.5	7
Elastic Strength	Min.	Electrode Nipple	Mpa	9.8	9.8	7.8	6.4	9.8
Elastic Strength	Min.	Electrode Nipple	Mpa	12.7	12.7	12.7	12.7	14.0
Elastic Modulus	Max.	Electrode Nipple	Gpa	9.3	9.3	9.3	9.3	12.0
Elastic Modulus	Max.	Electrode Nipple	Gpa	13.7	13.7	13.7	13.7	14.0
Bulk Density	Min.	Electrode Nipple	G/cm³	1.58	1.52	1.52	1.52	1.60
Bulk Density	Min.	Electrode Nipple	G/cm³	1.63	1.63	1.68	1.68	1.70
Ash	Max.		%	0.5	0.5	0.5	0.5	0.3
C.T.E 100-600° C	Max.	Electrode Nipple	m k^-1	2.9	2.9	2.9	2.9	2.2
C.T.E 100-600° C	Max.	Electrode Nipple	m k^-1	3.0	3.0	3.2	3.2	2.4

Technical Properties of Graphite Electrodes
YB4089-92 YB4090-92

Items			Unit	NoMin.al Diameter(mm)
				High Power	Ultra High Power
				300-500	400-600
Resistivity	Max.	Electrode Nipple		7	6.5
				6.5	5.5
Bending Strength	Min.	Electrode Nipple	Mpa	9.8	10.0
				14.0	15.0
Elastic Modulus	Max.	Electrode Nipple	Gpa	12.0	14.0
				14.0	15.0
Bulk Density	Min.	Electrode Nipple	G/cm³	1.62	1.65
				1.70	1.70
Ash	Max.		%	0.3	0.3
C.T.E 100-600° C	Max.	Electrode Nipple	m k^-1	2.2	1.40
				2.4	1.60

Specifications & Allowance of graphite electrodes

Diameter				Length
Diameter		Actual Diameter		Length	Allowance mm
inch	mm	Max.	Min.	Length	Allowance mm
3	75	77	74	1000	+50 -75
4	100	102	99	1200
5^1/8	130	131	128	1200
6	150	154	151	1600	±100
8	200	204	201	1600
10	250	256	252	1600 1800
12	300	307	303
14	350	357	353
16	400	408	404	1800 2000
18	450	459	455
20	500	510	506
22	550	561	557	2000-2500
24	600	612	608	2000-2500

Current Carrying Capacity and Current Density of graphite electrodes

NoMin.al Diameter mm	Regular Power		High Power		Ultra High Power
NoMin.al Diameter mm	Current Carrying Capacity A	Current Density A/cm²	Current Carrying Capacity A	Current Density A/cm²	Current Carrying Capacity A	Current Density A/cm²
75	1000-1400	22-31
100	1500-2400	19-30
130	2200-3400	17-26
150	3000-4500	16-25
200	5000-6900	15-21
250	7000-10000	14-20
300	10000-13000	14-18	13000-17400	17-24
350	13500-18000	14-18	17400-24000	17-24
400	18000-23500	14-18	21000-31000	16-24	25000-40000	19-30
450	22000-27000	13-17	25000-40000	15-24	32000-45000	19-27
500	25000-32000	13-16	30000-48000	15-24	38000-55000	18-27
550	30000-42000	13-18	44000-58000	18-24	48000-66000	20-28
600	40000-53000	14-19	52000-67000	18-24	55000-76000	19-27

Df imensions oTapered Nipples

	Diameter		Nipple mm							Socket mm				Pitch mm
	inch	mm	D		L		d₂		l	d₁		H
3TPI	10 12 14 16 18 20 22 24	250 300 350 400 450 500 550 600	155.58 177.17 215.90 241.30 273.05 298.45 298.45 336.55	0 -0.50	220.10 270.90 304.80 338.60 355.60 372.50 372.50 457.20	0 -1	103.80 116.90 150.00 169.80 198.70 221.30 221.72 245.70	0 -3	10	147.14 168.73 207.47 232.87 264.62 290.02 290.02 328.11	+0.50	113.05 138.45 155.40 172.30 180.80 189.25 189.25 231.60	+7 0	8.47

	Diameter		Nipple mm							Socket mm				Pitch mm
	inch	mm	D		L		d₂		l	d₁		H
4TPI	3 4 5^1/8 6 8 10 12 14 16 18 20 22 24	75 100 130 150 200 250 300 350 400 450 500 550 600	46.04 69.85 79.38 92.08 122.24 152.40 177.80 203.20 222.25 241.30 269.88 298.45 317.50	0 -0.50	76.20 101.60 127.00 139.70 177.80 190.50 215.90 254.00 304.80 304.80 355.60 355.60 355.60	0 -1	20.80 40.30 45.60 56.20 80.00 108.00 129.20 148.20 158.80 177.90 198.00 223.36 242.41	0 -3	6	39.72 63.53 73.06 85.76 115.92 146.08 171.48 196.88 215.93 234.98 263.56 292.13 311.18	+0.50 0	41.10 53.80 66.50 72.85 91.90 101.30 114.00 133.00 158.40 158.40 183.80 183.80 183.80	+7 0	6.35

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Moment for reference for connecting nipples and electrodes

Diameter of Electrode		Moment		Diameter of Electrode		Moment
In	mm	ft-1bs	kgs-m	in	mm	ft-1bs	kgs-m
3	75	22	3	12	300	720	100
4	100	43	6	14	350	1190	165
5	130	72	10	16	400	1450	200
6	150	110	15	17	425	1660	230
7	175	160	22	18	450	1800	250
8	200	230	32	20	500	2310	320
9	225	330	45	22	550	2750	380
10	250	430	60	24	600	3110	430

Directions for use of graphite electrodes

1. When choosing diameter of the graphite electrodes for electric steel-making furnace, please refer to the current carrying capacity of the electrodes.

2. The transport and storage of the graphite electrodes must be kept away from being moistened or wetted by rain, snow and water. Be sure to dry them up before use.

3. During loading, unloading and transportation, the graphite electrodes must be handled with great care to protect the threads from being damaged by collision. in the course of loading, unloading and hoisting, it is advisable to use special hoist tools.

4. Before the electrodes are connected to the nipples, it is necessary to blow the electrode threads thoroughly clean with compressed air and screw the nipples tightly according to requirement for using moment spanner.

5. The terMinal faces or the two electrodes tightly screwconnected must be kept in close contact.

6. When the elevator of the electric arc furnace is hoisting the electrodes, no swinging so as to avoid the electrode joints being loosened and dislocated .

7. The holder devices of the electrodes should not hold the electrodes near the area of nipple sockets.

8. In order to prevent the breakage of the electrodes in case of scrap cave-ins, lift the electrodes in time according to the melting conditions dump the unmelted waste steel into the pool.

9. Charging the furnace, put the large scrap steel lumps at the bottom and the small ones at the top.

10.In order to prevent dislocation after the electrodes being jointed, we provide binding paste and pins which are easily to be applied.

For making constant improvement of our electrodes quality so as to serve our customers better, please always keep us informed of your comments and requirements.

Shenzhen Seto Industries Co., Ltd.

tel: +86-755-83664099 / 83663529

fax: +86-755-83663649 / 83984989

contact@sznorinco.com