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DESCRIPTION

Graphite electrodes nipples are used to connect two or more electrodes into column. And the purpose of that is to realize continuous use of electrodes in electric arc furnace steelmaking process. Nipples, with conventional external threads surface, are the important clamping device to extend the electrode length. Doing this avoids the unproductive consumption in smelting.

As a technical manufacturer, we know that the mismatch between the graphite electrode body and the nipple will lead to the electrode breaking during use. This not only just is an unproductive consumption in smelting, but also increases the amount of carbon in the molten steel. For these reasons, all electrode nipples are produced by our factory, not purchased.

FEATURE

High bulk density, precision thread accuracy.
Check the tolerance of nipples one by one.
Bending strength limits are measured.
High machining accuracy, good surface finishing.
Outstanding resistance to breakage.
Original factory production, not outsourcing.

APPLICATION

SPECIFICATION

Table 1 Technical Specification of Graphite Electrode Nipple

Item	Resistance	Density	Flexure Strength	Elastic Modulus	Ash Content	CTE
	(≤, µΩ·m)	(≥, g/cm3)	(≥, MPa)	(≤, GPa)	(≤, %)	(100 °C – 600 °C)
						(≤, 10-6/°C)
Regular power	6.0	1.72	15	14	0.3	2.5
High Power	5.0	1.75	18	18	0.3	2.2
Ultra High Power	4.2	1.78	20	22	0.3	1.4

Dimensions of nipple & socket

Table 2: Dimensions of Nipple & Sockets (TPI 3)

Electrode Dia.		Nipple Designation	Nipple		Socket
			Major Dia.	Length	Pitch Dia.	Depth	Thread Length
			(mm)	(mm)	(mm)	(mm)	(mm)
(inch)	(mm)		d1	l1	d4	l2	l3
9	225	139T3N	139.7	203.2	135.49	107.6	103.6
10	250	155T3N	155.57	220	151.36	116	112
12	300	177T3N	177.16	270.9	172.95	141.5	137.5
14/16	350/400	215T3N	215.9	304.8	211.69	158.4	154.4
14/16	350/400	215T3L	215.9	355.6	211.69	183.8	179.8
16/18	400/450	241T3N	241.3	338.7	237.09	175.3	171.3
16/18	400/450	241T3L	241.3	355.6	237.09	183.8	179.8
20	500	273T3N	273.05	355.6	268.84	183.8	179.8
20	500	273T3L	273.05	457.2	268.84	234.6	230.6
22	550	298T3L	298.45	457.2	294.24	234.6	230.6

* Pin pitch diameter d2 is equal to socket pitch diameter d4.
* Socket minor diameter d3 is equal to pitch diameter d4 minus 3.16 mm.
* Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user.

Table 3: Dimensions of Nipple & Sockets (TPI 4)

Electrode Dia.		Nipple Designation	Nipple		Socket
			Major Dia.	Length	Pitch Dia.	Depth	Thread Length
			(mm)	(mm)	(mm)	(mm)	(mm)
(inch)	(mm)		d1	l1	d4	l2	l3
9	225	139T4N	139.7	177.8	136.54	94.9	90.9
10	250	152T4N	152.4	190.5	149.24	101.3	97.3
12	300	177T4N	177.8	215.9	174.64	114	110
14	350	203T4N	203.2	254	200.04	133	129
14	350	203T4L	203.2	304.8	200.04	158.4	154.4
16	400	222T4N	222.25	304.8	219.09	158.4	154.4
16	400	222T4L	222.25	355.6	219.09	183.8	179.8
18	450	241T4N	241.3	304.8	238.14	158.4	230.6
18	450	241T4L	241.3	355.6	238.14	183.8	179.8
20	500	269T4N	269.88	355.6	266.72	183.8	179.8
20	500	269T4L	269.88	457.2	266.72	234.6	230.6
22	550	298T4N	298.45	355.6	295.29	183.8	179.8
22	550	298T4L	298.45	457.2	295.29	234.6	230.6
24	600	317T4N	317.5	355.6	314.34	183.8	179.8
24	600	317T4L	317.5	457.2	314.34	234.6	230.6

Table 4: Standard Electrode Sizes & Nipple Weights

Electrode		Standard Weight of Nipples
Nominal Electrode Size		TPI 3				TPI 4
Dia. × L		T3N		T3L		T4N		T4L
inch	mm	lbs	kg	lbs	kg	lbs	kg	lbs	kg
14 × 72	350 × 1800	32	14.5	-	-	24.3	11	-	-
16 × 72	400 × 1800	45.2	20.5	46.3	21	35.3	16	39.7	18
16 × 96	400 × 2400	45.2	20.5	46.3	21	35.3	16	39.7	18
18 × 72	450 × 1800	62.8	28.5	75	34	41.9	19	48.5	22
18 × 96	450 × 2400	62.8	28.5	75	34	41.9	19	48.5	22
20 × 72	500 × 1800	79.4	36	93.7	42.5	61.7	28	75	34
20 × 84	500 × 2100	79.4	36	93.7	42.5	61.7	28	75	34
20 × 96	500 × 2400	79.4	36	93.7	42.5	61.7	28	75	34
20 × 110	500 × 2700	79.4	36	93.7	42.5	61.7	28	75	34
22 × 84	550 × 2100	-	-	-	-	73.4	33.3	94.8	43
22 × 96	550 × 2400	-	-	-	-	73.4	33.3	94.8	43
24 × 84	600 × 2100	-	-	-	-	88.2	40	110.2	50
24 × 96	600 × 2400	-	-	-	-	88.2	40	110.2	50
24 × 110	600 × 2700	-	-	-	-	88.2	40	110.2	50

Table 5: Coupling Torque Reference for Nipple & Electrode

Electrode Diameter	inch	8	9	10	12	14	16	18	20	22	24
Electrode Diameter	mm	200	225	250	300	350	400	450	500	550	600
Easing Moment	N.m	200–260	300–340	400–450	550–650	800–950	900–1100	1100–1400	1500–2000	1900–2500	2400–3000

Below chart is the matching relationship between electric furnace capacity, transformer power load and electrode size.

Furnace Capacity	Inner Dia.	Transformer Capacity (MVA)			Electrode Dia.
t	m	RP	HP	UHP	mm
10	3.35	5	7.5	10	300/350
15	3.65	6	10	12	350
20	3.95	7.5	12	15	350/400
25	4.3	10	15	18	400
30	4.6	12	18	22	400/450
40	4.9	15	22	27	450
50	5.2	18	25	30	450
60	5.5	20	27	35	500
70	6.8	22	30	40	500
80	6.1	25	35	45	500
100	6.4	27	40	50	500
120	6.7	30	45	60	550/600
150	7	35	50	70	600
170	7.3	-	60	80	600
200	7.6	-	70	100	600/700
250	8.2	-	-	120	700
300	8.8	-	-	150	700