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Графит Графитовый электрод

The company has annual improvement and upgrading of equipment, automation of production and testing of the whole process of collecting information and data analysis, integrated statistics, online monitoring and quality management in strict accordance with the requirements of ISO9001 implementation of the whole process, to ensure product quality and highly stable.

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1.Graphite electrode is made of petroleum coke,needle coke, and bonding coal pitch. Its production process is: calcining, dosing, mixing, forming, baking and impregnation, graphitization in a high temperature of over 3000°C, then precision machining.

Graphite electrode is acting as a conductive body which release heat in the form of arc for heating and melting steel in the furnace.According to the application, it can be divided into regular power(RP), high power(HP) and ultra high power(UHP).

Graphite electrode is an important conductive material in smelting industry with good electrical conductivity, thermal conductivity and high mechanical strength, good corrosion resistance under high temperature. Graphite electrode is widely used in EAF, LRF, submerged arc furnace(producing ferroalloy, pure silicon, yellow phosphorus, calcium carbide etc), resistance furnace (such as the graphitization furnace, glass melting furnace and silicon carbide furnace etc).

By close cooperation with world famous coke supplier Mithubishi, Phillips66, PMC, Handan Damai Carbon is top ranked in China carbon industry, annual exportation is over 15000mt which are widely selling to over 35 countries around the world, Handan Damai Carbon is acting as a solid bridge between world steel industry & China carbon industry, our advantages are:

Strictly control of raw material ensures it is from the best origin;

Advanced production technology & facilities &experienced workers;

Strict quality tracing system to ensure each GE excels buyer needs;

Technical assistance & after service are available whenever needed;

Sufficient stock in seaports to ensure competitive price&fast delivery;

2.The company has annual improvement and upgrading of equipment, automation of production and testing of the whole process of collecting information and data analysis, integrated statistics, online monitoring and quality management in strict accordance with the requirements of ISO9001 implementation of the whole process, to ensure product quality and highly stable.

SPECIFICATION SHEET FOR PHYSICAL PROPERTIES
UHP FOR AC FURNACE						UHP FOR DC FURNACE
Parameter	Unit	ф 200 - 300 mm	ф 350 - 500 mm	ф 550 & 600 mm	ф 650 -700 mm	ф 600 -700 mm
Parameter	Unit	ф 8" - 12"	ф 14" - 20"	ф 22" & 24"	ф 26" - 28"	ф 24" - 28"
Bulk Density	gm/cm³	1.66 - 1.76	1.65 - 1.75	1.65-1.73	1.66-1.74	1.68-1.76
Speciic Resistance	m W-m	4.5 - 6.0	4.5 - 6.0	4.5-5.8	4.5-5.8	4.0-5.8
Flexural Strength	N/mm²	12-17	9 - 14	9 - 14	9 - 14	10-14
Young's Modulus	N/mm²	10-14	9-14	9-14	9-14	9-14
Ash Contents (Max)	%	0.2	0.2	0.2	0.2	0.2
C.T.E. (Longitudinal)	CTE ( x10-7/0C) @ 0-50 0C	2.5-8.0	2.5-8.0	2.5-8.0	2.0 -5.0	2.0 -5.0

UHP-LF
Parameter	Unit	f 300 - 500 mm
Parameter	Unit	f 12" - 20"
Bulk Density	gm/cm³	1.65 - 1.75
Specific Resistance	m W-m	4.5 – 6.0
Flexural Strength	N/mm²	9 - 14
Young's Modulus	N/mm²	8.5 - 14.5
Ash Contents (Max)	%	0.2
C.T.E. (Longitudinal)	CTE ( x10-7/0C) @ 0- 50 0C	3.0 - 8.5

HP
Parameter	Unit	f 150 - 300 mm	f 350 - 500 mm
Parameter	Unit	f 6" - 12"	f 14" - 20"
Bulk Density	gm/cm³	1.66 - 1.75	1.65 - 1.75
Specific Resistance	m W-m	5.5 - 7.5	5.5 - 7.5
Flexural Strength	N/mm²	12-17	9 - 15
Young's Modulus	N/mm²	8 - 14	7 - 13
Ash Contents (Max)	%	0.5	0.5
C.T.E. (Longitudinal)	CTE ( x10-7/0C) @ 0- 50 0C	5.0 - 12	5.0 - 12

RP
Parameter	Unit	f 150 - 300 mm	f 350 - 500 mm
Parameter	Unit	f 6" - 12"	f 14" - 20"
Bulk Density	gm/cm³	1.56 - 1.65	1.56 - 1.65
Specific Resistance	m W-m	6.0 - 8.0	6.5 - 8.5
Flexural Strength	N/mm²	9 - 12	7 - 11
Young's Modulus	N/mm²	8 - 10	6 - 10
Ash Contents (Max)	%	0.5	0.5
C.T.E. (Longitudinal)	CTE ( x10-7/0C) @ 0- 50 0C	0.5 - 1.2	0.5 - 1.2

NOTE: These are Typical Values & are subjected to change without notice

SPECIFICATION SHEET FOR CURRENT CARRYING CAPACITIES ( Amps )
Dia. (mm)	RP		HP		UHP-LF		UHP-ACF		UHP-DCF
Dia. (mm)	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max
75	----	----	1200	2500	----	----	----	----	----	----
100	----	----	1600	3500	----	----	----	----	----	----
130	----	----	2500	4800	----	----	----	----	----	----
150	3800	5700	4200	6500	----	----	----	----	----	----
175	4300	7400	5000	9000	----	----	----	----	----	----
200	5200	9100	6400	11200	----	----	8000	14000	----	----
225	6500	11700	8000	14400	----	----	10000	18000	----	----
250	8450	14300	10400	17600	----	----	13000	22000	----	----
300	11700	19500	14400	24000	15000	30000	15000	30000	----	----
350	13000	24700	16000	30400	20000	38000	20000	38000	----	----
400	18200	30550	22400	37600	25000	40000	25000	40000	----	----
450	22100	35750	27200	44000	32000	45000	32000	45000	----	----
500	26000	41600	32000	51200	38000	55000	38000	55000	----	----
550	29250	45500	36000	56000	45000	65000	45000	65000	----	----
600	32500	52000	40000	64000	----	----	50000	75000	50000	90000
650	----	----	----	----	----	----	60000	85000	60000	105000
700	----	----	----	----	----	----	70000	100000	70000	120000

DIMENSIONAL DETAILS OF ELECTRODES & NIPPLES

Ⅰ.DIAMETER TOLERANCE & STANDARD NIPPLE SIZES :

DIAMETE R ( mm )	STANDARD NIPPLE SIZE				DIAMETER TOLERANCE			NOMINAL LENGTH SUPPLIED ( mm )
	4 T.P.I. NIPPLE		3 T.P.I. NIPPLE		Maximum	Minimum ( mm )	Low Spot
	Dia	Length ( mm )	Dia	Length ( mm )	( mm )		( mm )
	( mm )	Length ( mm )	( mm )	Length ( mm )
75	46.04	76.2	-	-	78	73	72	1000, 1200
100	69.85	101.6	-	-	103	98	97	1000, 1200, 1500
130	79.38	127	-	-	132	127	126	1000, 1200, 1500
150	92.08	139.7	-	-	154	149	146	1200, 1500, 1800
175	107.95	165.1	-	-	179	174	171	1200, 1500, 1800
200	122.24	177.8	-	-	205	200	197	1200, 1500, 1800
225	139.7	177.8	-	-	230	225	222	1500, 1800
250	152.4	190.5	155.58	220.1	256	251	248	1500, 1800
300	177.8	215.9	177.17	270.9	307	302	299	1500, 1800, 2100
350	203.2	254	215.9	304.8	357	352	349	1500, 1800, 2100
400	222.25	304.8	215.9	304.8	409	403	400	1500, 1800, 2100, 2400
450	241.3	304.8	241.3	304.8	460	454	451	1500, 1800, 2100, 2400
500	269.88	457.2	273.05	355.6	511	505	502	1800, 2100, 2400, 2700
550	298.45	457.2	298.45	372.5	562	556	553	2100, 2400, 2700
600	317.5	457.2	-	-	613	607	604	2100, 2400, 2700
650	374.65	558.8	-	-	663	657	654	2100, 2400, 2700
700	374.65	558.8	-	-	714	708	705	2100, 2400, 2700

Ⅱ.LENGTH TOLERANCE :

NOMINAL LENGTH	FULL LENGTH ( mm )		SHORT LENGTH ( mm )
( mm )	Maximum	Minimum	Maximum	Minimum
1000	1050	925	924	800
1200	1350	1100	1099	975
1500	1650	1400	1399	1225
1800	1975	1700	1699	1525
2100	2275	1975	1974	1825
2400	2575	2275	2274	2125
2700	2895	2540	2539	2400

DIMENSIONAL DETAILS OF ELECTRODES & NIPPLES

I. DIAMETER TOLERANCE & STANDARD NIPPLE SIZES :

DIAMETER (mm )	STANDARD NIPPLE SIZE				DIAMETER TOLERANCE			NOMINAL LENGTH SUPPLIED ( mm )
	4 T.P.I. NIPPLE		3 T.P.I. NIPPLE		Maximum	Minimum ( mm )	Low Spot
	Dia( mm )	Length ( mm )	Dia( mm )	Length ( mm )	( mm )	Minimum ( mm )	( mm )
75	46.04	76.2	-	-	78	73	72	1000, 1200
100	69.85	101.6	-	-	103	98	97	1000, 1200, 1500
130	79.38	127	-	-	132	127	126	1000, 1200, 1500
150	92.08	139.7	-	-	154	149	146	1200, 1500, 1800
175	107.95	165.1	-	-	179	174	171	1200, 1500, 1800
200	122.24	177.8	-	-	205	200	197	1200, 1500, 1800
225	139.7	177.8	-	-	230	225	222	1500, 1800
250	152.4	190.5	155.58	220.1	256	251	248	1500, 1800
300	177.8	215.9	177.17	270.9	307	302	299	1500, 1800, 2100
350	203.2	254	215.9	304.8	357	352	349	1500, 1800, 2100
400	222.25	304.8	215.9	304.8	409	403	400	1500, 1800, 2100, 2400
450	241.3	304.8	241.3	304.8	460	454	451	1500, 1800, 2100, 2400
500	269.88	457.2	273.05	355.6	511	505	502	1800, 2100, 2400, 2700
550	298.45	457.2	298.45	372.5	562	556	553	2100, 2400, 2700
600	317.5	457.2	-	-	613	607	604	2100, 2400, 2700
650	374.65	558.8	-	-	663	657	654	2100, 2400, 2700
700	374.65	558.8	-	-	714	708	705	2100, 2400, 2700

Graphite electrode transportation

1.Graphite electrodes are covered with rainproof tarpaulin during long-distance transportation.

2.When unloading the electrodes packed with wooden cases by hoisting machine, the steel wire rope must be used. The steel packing belt of the electrode shall not be directly hoisted and unloaded.

3.To protect the end face and thread of the electrode, the electrode shall not be transported directly by steel hook to hooking.

4.When loading and unloading joint box, handle with care to prevent thread damage.

Graphite electrode storage

1.The electrodes should be stored in a clean and dry place; Temporarily unused electrodes and nipples do not remove the packaging, to prevent Dust and sundries fall on the thread or inside the electrode hole, which affects the accuracy of the product docking.

2.The electrodes stacked on open fields must be covered with rainproof tarpaulin.

3.Electrodes should be stored neatly in the warehouse ,Both sides of the Electrode stack should be padded , To prevent slippery stack.

4.The stack height of the bulk electrode is usually less than 2.8 meters, The height of the box electrode should not exceed 4 layers.

5.The temperature of the place where the nipples are stored should not be too high to Prevent bituminous nipples from melting.

Operation of graphite electrode connection

1.The wet electrode should be dried before use.

2.Remove the foam protective cap on the alternate electrode holes and check if the inner thread of the electrode holes is intact.

3.Clean the spare electrode surface and hole internal threads with compressed air without oil and water; Avoid cleaning with wire mesh or metal brush emery cloth.

4.The nipples shall be carefully screwing into the electrode hole of the standby electrode end (it is not recommended to install the connector directly into the replaced electrode on the furnace) and the thread shall not be hit.

5.Screw the electrode holder (Graphite lifting spreader is recommended) into the electrode hole at the other end of the standby electrode.

6.Lift the spare electrode upside the standby electrode ,Slowly drop after aligning electrode holes ;Rotating standby electrode ,Turn the screw hook down with the electrode;When the two electrode faces are 10 to 20mm apart ,Clean the exposed parts of the two ends of the electrode and the nipple with compressed air ; At the end of the fully lower electrode, do not overshoot ,Otherwise, the thread of the electrode hole and nipple will be damaged due to violent collision.

7.Use a torque wrench to twist the standby electrode until the ends of the two electrodes are in close contact （The correct crack of electrode andnipple is less than 0.05mm）.

Matters needing attention when using graphite electrode

1.The electrode holder shall be clamped outside the warning line of the top electrode，Otherwise, the electrode may be broken easily.The interface between gripper and electrode should be cleaned frequently，To maintain good contact with the electrode ，The clamping device cooling water jacket should avoid leakage.

2.If a crack is found at the electrode joint, the reason should be found out，The connection crack can be removed before use.

3.During electrodes connection , when the nipple pin is found to fall off, the nipple pin should be replaced before connection.

4.Electrodes should be used vertically to avoid tilt operation, especially not horizontally to avoid breaking a set of connected electrodes , to avoid broken .

5.When charging burden into the furnace,Large pieces of material should be loaded near the bottom of the electric furnace , To reduce the collapse of large pieces of burden impact electrode .

6.When smelting, should avoid the insulation material block stack right underof the electrode directly , avoid to affect the electrode using, or even broke the electrode

7.When the electrode is rising or falling, it should avoid touching the furnace cover and lead to the electrode damage .

8.At the smelting site, it is necessary to avoid steel slag splashing onto the thread buckle of the electrode or nipples which stored at the site, thus damaging the precision of the thread.

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