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UHP Graphite Electrode

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UHP Graphite Electrodes
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UHP Graphite electrodes
Graphite electrode is one of the most important metallurgical products, mainly used as conductive material in electric arc furnace metallurgy production. UHP graphite electrodes are mainly used for steelmaking high-power and ultra-high power electric furnaces.
● Electric Arc Furnace (EAF)
● DC electric arc furnace
● AC electric arc furnace
● Submerged arc furnace
● Ladle Furnace (LF)

Advantage
UHP graphite electrode is mainly used for ultra high power electric arc furnaces with the current density greater than 25 A/cm2.
● Withstand large currents, high discharge rate.
● Good dimension stability, not easy to deform.
● Resistant to cracking & spalling.
● High resistance to oxidation and thermal shock.
● High mechanical strength, low electrical resistance.
● High machining accuracy, good surface finishing.

Specification

Item		Unit	UHP Nominal Diameter(mm)				UHP Nominal Diameter(mm)
			YB/T4090 Industry Standard				Enterprise Standard
			300-400	450-500	550-650	700-800	300-400	450-500	550-650	650-700
LSR≤	Electrode	μΩ.M	6.2	6.3	6	5.8	5.0-6.0	5.0-6.0	4.8-5.5	4.8-5.5
LSR≤	Nipple	μΩ.M	5.3	5.3	4.5	4.3	3.8-4.5	3.8-4.5	3.5-4.1	3.5-4.1
Flexural Strength ≥	Electrode	Mpa	10.5	10.5	10.0	10.0	11.0-13.0	11.0-13.0	10.0-13.0	10.0-13.0
Flexural Strength ≥	Nipple	Mpa	20.0	20.0	22.0	23.0	20.0-25.0	20.0-25.0	24.0-30.0	24.0-30.0
Elastic Modulus ≤	Electrode	Gpa	14.0	14.0	14.0	14.0	8.0-12.0	8.0-12.0	7.0-10.0	7.0-10.0
Elastic Modulus ≤	Nipple	Gpa	20.0	20.0	22.0	22.0	12.0-16.0	12.0-16.0	16.0-21.0	16.0-21.0
Bulk Density ≥	Electrode	g/cm³	1.67	1.66	1.66	1.68	1.68-1.73	1.68-1.73	1.69-1.73	1.69-1.73
Bulk Density ≥	Nipple	g/cm³	1.74	1.75	1.78	1.78	1.76-1.82	1.76-1.82	1.79-1.84	1.79-1.84
CTE ≤	Electrode	10-6/ ℃	1.5	1.5	1.5	1.5	1.3-1.5	1.3-1.5	1.3-1.5	1.3-1.5
CTE ≤	Nipple	10-6/ ℃	1.4	1.4	1.3	1.3	1.0-1.4	1.0-1.4	1.0-1.3	1.0-1.3
Ash ≤		%	0.5	0.5	0.5	0.5	0.2	0.2	0.2	0.2

Allowed Current Load

YB/T4090 Industry Standard					Enterprise Standard		Enterprise Standard
YB/T4090 Industry Standard					EAF		LF
Nominal Dia	Nominal Dia	Cross Sectional Area	Permissible Current Load	Current Density	Permissible Current Load	Current Density	Permissible Current Load	Current Density
in	mm	cm²	A	A/cm²	A	A/cm²	A	A/cm²
14	350	937	20000-30000	20-30	21000-32000	22-32	23000-34000	24-35
16	400	1275	25000-40000	19-30	26000-42000	20-33	28000-46000	22-36
18	450	1622	32000-45000	19-27	33000-49000	20-30	36800-52000	23-32
20	500	2000	38000-55000	18-27	40000-60000	20-30	43000-63000	22-32
22	550	2427	45000-65000	18-27	45000-68000	18-28	45000-69000	18-28
24	600	2892	50000-75000	18-26	52000-81000	18-28	-	-
26	650	3317	60000-85000	18-25	69000-89000	20-26	-	-
28	700	3935	70000-120000	18-30	70000-100000	18-27	-	-

UHP Graphite Graphite Electrode Weight

UHP Graphite Electrodes Reference Weight
Nominal Dia	Nominal Dia	Length	T3N	T3L	T4N	T4L
in	mm	mm	kg	kg	kg	kg
14	350	1800	294	-	297	294
14	350	2100	342	-	347	342
16	400	1800	383	382	388	386
16	400	2100	447	446	453	450
18	450	1800	477	476	486	483
18	450	2100	561	560	570	567
18	450	2400	645	644	654	651
20	500	1800	587	-	595	590
20	500	2100	691	-	699	694
20	500	2400	795	-	803	798
22	550	2100	-	-	-	835
22	550	2400	-	-	-	959
22	550	2700	-	-	-	1085
24	600	2400	-	-	1152	1144
24	600	2700	-	-	1301	1293
26	650	2400	-	-	-	1342
28	700	2400	-	-	-	1540
28	700	2700	-	-	-	1743

Packaging

The graphite electrode is packed in wooden crates, and the nipples are packed in wooden cases or pre-set in the electrodes. Electrodes would be covered with polythene sheet to protect the same from dust and moisture, and fasten with steel strips, which is good looking and firm. Proper and safe seaworthy packing, easy for forklift handling. Necessary measures would be provided to avoid possible damages to nipple threads-such as protective foam and rubber caps.

Nominal Diameter		Pallet	Electrode Packing		Electrode Preset Nipple Packing
Nominal Diameter		Pallet	Appr N.W.	Dimension	Appr N.W.	Dimension
mm	inch	pcs	kg	mm	kg	mm
200X1600	8X63	9	750	1700X1070X480	770	1800X1070X480
200X1700	8X67	9	800	1800X1070X480	820	1900X1070X480
250X1700	10X67	3	425	1800X820X350	438	1910X820X350
250X1800	10X71	3	450	1900X820X350	465	2010X820X350
300X1800	12X71	3	630	1900X970X400	650	2100X970X400
350X1800	14X71	3	860	1900X1120X450	885	2100X1120X450
400X1800	16X71	3	1120	1900X1270X500	1165	2100X1280X500
400X2100	16X83	3	1300	2200x1270x500	1345	2400X1280X500
450X1800	18X71	2	950	1900x970x550	990	2100X970X550
450X2100	18X83	2	1100	2200x970x550	1140	2400X970X550
500X1800	20X71	2	1200	1900X1070X600	1255	2150X1070X600
500X2100	20X83	2	1400	2200X1070X600	1455	2450X1070X600
550X2100	22X83	2	1690	2200X1170X650	1760	2450X1170X650
550X2400	22X95	2	1940	2500X1170X650	2010	2750X1170X650
600X2100	24X83	2	2000	2200X1270X500	2080	2450X1270X700
600X2400	24X95	2	2300	2500X1270X700	2380	2750X1270X700