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Furnace square electrode

Graphite square|graphite block (Extrusion|Molding|Isostatic Pressing) is a main graphite products. The production process is similar with graphite electrode, but not a by-product of graphite electrode. There are a lots of classification, the production process is complex, and general production cycle is higher than two months. Also, there are variety types of Graphite square|graphite block. According to the different processing technology it can be divided into extruding graphite block/square, molding graphite block/square, isostatic pressing graphite block/square.
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Graphite Square|Graphite Block

Graphite square|graphite block (Extrusion|Molding|Isostatic Pressing) is a main graphite products. The production process is similar with graphite electrode, but not a by-product of graphite electrode. There are a lots of classification, the production process is complex, and general production cycle is higher than two months. Also, there are variety types of Graphite square|graphite block. According to the different processing technology it can be divided into extruding graphite block/square, molding graphite block/square, isostatic pressing graphite block/square.
Generally, it can be divided into extrusion graphite square|graphite block, molding graphite square|graphite block and isostatic pressing graphite square|graphite block in accordance with different processing technologies. 
It can be divided into fine-particle graphite square|graphite block, medium-coarse particle graphite square|graphite block and coarse-particle graphite square|graphite block in accordance with different granularity. 
The graphite square|graphite block is widely used: for example, it is used to manufacture product molds (EDM). Meanwhile, the graphite square|graphite block is also widely used in other manufacturing industries. We can produce any specifications of the graphite square|graphite block below the size 3600mm(length)×850 mm(width)×850mm(height). 
HP Graphite Co., Ltd. has more than fifteen years of experience in graphite square|graphite block production, and the graphite square|graphite block provided by us has following characteristics: 

The graphite square|graphite block has high bulk density, low resistivity, oxidation resistance, corrosion resistance, high temperature resistance and good electrical conductivity, etc.  

Specifications of graphite block|graphite squire

Specification Size of Graphite Block

2PSK 2TSK 0.8TSK 0.8GSK
Ф430*2040 Ф430*2040 400*400*1800 500*500*1900
8p:Ф430*2040 400*400*1800 500*500*2100 500*500*2100
400*400*1800 500*500*1950 Ф530*1900 580*580*1900
400*400*2100 500*500*2100 Ф630*1900 Ф630*1800
500*500*2100 Ф530*1900 Ф730*370 600*600*2400
Ф530*1900 Ф580*580*1900 Ф730*620 Ф680*610
Ф630*370 Ф630*1900 Ф730*1850 Ф730*370
Ф630*1900 580*580*1900 Ф750*620 Ф730*420
580*580*1900 600*600*2400 Ф830*370 Ф730*520
600*600*2400 Ф730*1850 Ф830*740 Ф730*520
Ф650*370 Ф830*1500 Ф1030*420 Ф750*370
Ф730*370 Ф830*720 Ф1100*590 Ф750*520
Ф730*1850 Ф730*370 Ф1130*370 Ф750*620
Ф830*370 Ф830*1500   Ф830*370
Ф830*740 Ф930*370 Ф1170*610 Ф830*520
Ф930*370 Ф1030*520 Ф1230*370 Ф1110*420
Ф1030*370 Ф1090*525 Ф1230*590 Ф1120*420
Ф1130*370 Ф1090*540 Ф1330*420 Ф1130*370
Ф1270*370 Ф1100*520 Ф1300*610 Ф1170*370
8p:Ф1170*370 Ф1210*540 1100*1100*470 Ф1330*420
Ф1230*370 Ф1230*370 1170*1100*470 Ф1410*490
Ф1290*370 Ф1230*560 1360*360*360 Ф1500*370
Ф1280*370 Ф1630*490 1360*420*360 Ф1530*370
Ф1400*370 Ф1800*370 2200*880*420 Ф1600*370
Ф1430*370 Ф2000*370 2450*660*420 Ф1800*370
Ф1530*370 Ф2100*370 3000*560*320 2300*660*370
Ф1630*370 2200*880*420 3300*630*430 2500*800*420
Ф1830*370 2400*660*370 3600*630*420 2400*660*370
Ф1900*370 3300*630*420 3900*680*420 1530*1520*370
Ф2100*370 3600*630*420 4T 2400*660*610 1950*1100*500
400*420*2100   4T 2100*620*540 2900*560*410
8p:Ф830*370     3000*560*320
8p:Ф930*370     3000*560*410
8p:Ф1130*370     3300*660*420
      3600*630*420

Physical and chemical indexes of graphite block|graphite squire

Items  Unit GSK TSK PSK
Granularity  mm 0.8 2 4
Resistivity μΩm ≤7.5 ≤8 ≤8.5
Bulk density g/cm3 ≥1.74 ≥1.72 ≥1.72
Compressive strength  Mpa ≥36 ≥35 ≥34
Flexural strength Mpa ≥15 ≥14.5 ≥14
Ash % ≤0.3 ≤0.3 ≤0.3
Elastic mould Gpa ≤8 ≤7 ≤6
Thermal expansion coefficient 10-6/℃ ≤3 ≤2.5 ≤2
Porosity  % ≥18 ≥20 ≥22

 

Furnace square electrode Graphite Block
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.
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). 
Hebei Haiteng New Materials Technology Co.,LTD. 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
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
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
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
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
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(mm) Minimum (mm) Low Spot(mm)
Dia(mm) Length (mm) Dia(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(mm) Minimum (mm) Low Spot(mm)
Dia(mm) Length (mm) Dia(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

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 and nipple 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 under of 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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