Disclaimer:
The information in this publication is provided "AS IS" without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability, fitness for a particular purpose, or
non-infringement, and GrafT ech International Holdings Inc. ("GrafT ech") assumes no liability arising out of the use of it. The data listed falls within the normal range of product properties but should not be used to establish specification limits or used alone as the basis of design.
GrafTech's liability to purchasers is expressly limited to the terms and conditions of sale. This publication could include technical inaccuracies or typographical errors.
Changes are periodically added lo the information contained herein. GrafT ech may make improvements
and/or changes in the product(s) and/or services described in this publication at any time. No portion of thismaterial may be reprinted in any form without the express
written permission of GrafT ech. UCAR is a registered trademark licensed for use to GrafTech International Holdings Inc.
©2016 GrafT ech International Holdings Inc.
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Maximizing steel productivity through technology and service leadership
•·Disclaimer:
The information in this publication is provided "AS IS" without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability, fitness for a particular purpose, or non-infringement, and GrafTech International Holdings Inc. ("GrafTech") assumes no liability arising out of the use of it. The data listed falls within the normal range of product properties but should not be used to establish specification limits or used alone as the basis of design. GrafTech's liability to purchasers is expressly limited to the terms and conditions of sale. This publication could include technical inaccuracies or typographical errors. Changes are periodically added lo the information contained herein. GrafTech may make improvements and/or changes in the product(s) and/or services described in this publication at any time. No portion of this material may be reprinted in any form without the express written permission of GrafTech. UCAR is a registered trademark licensed for use to GrafTech International Holdings Inc. ©2016 GrafTech International Holdings Inc.
For more information, visit www.graftech.com
or contact one of our locations listed below:
ASIA PACIFIC
Beijing, China – Sales OfficeShanghai GrafTech Trading Co., Ltd.Jinglun Hotel, Room 4067No.3 Jian Wai Da JieBeijing, 100020 CHINATel: 86.10.8599.9291
Shanghai, China – Sales OfficeShanghai GrafTech Trading Co., Ltd.Room 1217, No 289 Wujin RoadHongkou District, Shanghai, 200080, CHINATel: 86.21.6325.8018
Hong Kong, China – Sales OfficeGrafTech Hong Kong LimitedTien Chu Commercial Building 7/F173-174 Gloucester RoadWan Chai, Hong Kong, CHINATel: 852.2739.2820
EUROPE, MIDDLE EAST, AFRICA
Calais, France – Manufacturing FacilityGrafTech France S.N.C.Rue des GarennesF-62100 Calais FRANCETel: 33.3.21.19.1420
Moscow, Russia – Sales OfficeGrafTech RUS LLC35 Usacheva Str., 7th FloorMoscow, 119048 RUSSIATel: 7.495.937.9848.9849
Pamplona, Spain – Manufacturing Facility/Sales Office Graftech Iberica S.L.Carretera de Astrain S/NE-31171 OrorbiaNavarra, SPAINTel: 34.948.321.200
Bussigny, Switzerland – Sales OfficeGrafTech Switzerland S.A.Boulevard de l’Arc-en-Ciel 361030 Bussigny-près-LausanneSWITZERLANDTel: 41.21.821.31.11
Meyerton, South Africa – Sales Office/Warehouse GrafTech South Africa (Pty) Ltd.Unit B, 56 Loch StreetMeyerton, GautengSOUTH AFRICA 1961Tel: 27.16.362.1270
NORTH AMERICA
Brooklyn Heights, Ohio – HeadquartersGrafTech International Holdings Inc.982 Keynote CircleBrooklyn Heights, Ohio USA 44131Tel: 1.216.676.2555
St. Marys, Pennsylvania – Manufacturing FacilityGrafTech USA LLC800 Theresia St.St Marys, Pennsylvania USA 15857Tel: 1.814.834.2801
Port Lavaca, Texas (Seadrift Coke) – Manufacturing Facility Seadrift Coke L.P.8618 State Hwy. 185 NorthP.O. Box 192Port Lavaca, Texas USA 77979Tel: 1.361.552.8887
Monterrey, Mexico – Manufacturing Facility/Sales Office GrafTech Mexico S.A. de C.V.Carretera Miguel AlemánKm. 20 #600 Ote.Apodaca, Nuevo León MEXICO 66600Tel: 52.81.8.135.5600
SOUTH AFRICA
Salvador, Brazil – Graphite Electrode Machine Shop GrafTech Brasil Participações LtdaRodovia BA-522 / Km-7Candeias, Bahia BRAZIL 43813-300Tel: 55.71.2108.9601
São Paulo, Brazil – Sales OfficeGrafTech Brasil Participações LtdaRod. BA-522, KM-7, S/Nº – Distrito IndustrialCandeias – BA – BRAZIL 43813-300Tel: 55.11.99645.6952
GrafTech International Ltd. ("GrafTech") is the leader in the carbon
and graphite industry because we focus on maximizing our customer's
bottom line and providing unparalleled support for their business, while
developing cutting edge technology that sets the standard in the steel
industry. From the very beginning of the company in 1886 through
today, we have worked in close partnership with our steelmaking
customers by focusing on transforming their needs into products and
services. Our knowledge base in the steelmaking process is unequaled
in the graphite electrode industry and is the key to our unmatched
technical service.
Throughout the last century and into the 21st century, GrafTech's
aggressive and impressive research and development record has led to
revolutionary innovations in graphite technology which has increased
productivity for our customers. GrafTech is proud of our strong
commitment to our customers to provide the necessary competitive
advantage to maximize productivity. Technical and service leadership is
the foundation of our business.
Maximizing Steel Productivitv Through Technolouv
and Service leadership GrafTech's vision is to enable customer leadership, better and faster
than our competition, through the creation, innovation and
manufacture of graphite and carbon material science-based solutions.
We have over 125 years of experience in the research and development
of graphite and carbon-based solutions. Our business was founded in
1886 by the National Carbon Company. We are a leading manufacturer
of a broad range of high quality graphite electrodes, products essential
to the production of electric arc furnace ("EAF") steel and various
other ferrous and nonferrous metals.
GrafTech, through its Seadrif Coke LP. subsidiary, produces
petroleum needle coke, w 1ch is the key raw material in the
manufacture of graphite jectrodes, which are consumed in EAF steel
production.
In August 2015, G afTech became an indirect wholly owned subsidiary
of Brookfield set Management Inc., which is an experienced
operator of in ustrial, natural resource and other tangible asset
businesses. his transaction has provided us a stable equity partner with experie ce in cyclical capital intensive industries.
GratTech Global Qualitv
We consider sustained customer statisfaction the ultimate
measure of product and service performance. Therefore,
GrafTech's stringent quality system focuses on
customer's needs and satisfaction. It is powered by lean
and 6 sigma methodology to minimize product variation
and drive continuous performance improvement.
• Our Arc Furnace Technology engineers analyze
customer applications and requirements - current and
future - and feed them into our technology systems.
This enables us to optimize today's electrode
performance and model next generation technology.
• Technology uses material science to translate customer
applications and requirements into raw material,
processing and testing Best Practices. This key
Know-How ensures that all of our manufacturing
locations utilize the latest process technology.
• Manufacturing focuses on Best Practice procedures
and targets. Process and product variation is minimized
through extensive use of statistical process control.
• Customer Technical Service engineers provide
electrode use Best Practices to assure optimum
graphite electrode performance.
• GrafTech employs strategic management techniques to
achieve optimal manufacturing capability and global
quality. We utilize ISO 9000 standards and statistical
process control throughout all levels of the
organization to assure our success.
u
Graphite Electrode Properties Graphite Electrode Properties
Typical Range
250-400mm 450-600mm Testing Property Units
10"-16" 18"-24"
650-750mm
26"-30" Method
AGX™
AGX™
AGX™
(ASTM) AGR AGR
Bulk density g/cm 3 1. 55-1. 65 1. 66-1. 74 1. 56-1. 66 1. 66-1. 73 1. 68-1. 75 C-559
Specific resistance µom 6. 0-8. 0 4. 7-6.0 5.5-7.0 4. 3-5.4 4. 1-4. 8 C-611
MPa 6. 0-12.0 9. 0-13. 5 5. 0-12. 0 8.0-12.0 9.0-12.5 Flexural strength C-651
PSI 900-1800 1400-2000 800-1800 1200-1800 1400-1900
Coefficient of x10-
6/ ° C thermal expansion
0. 5-1. 5 0. 2-1.4 0. 2-1. 8 0. 15-0.6 0. 2-0. 5 PATE*
Connecting Pin Properties
Property Units Typical Range Testing Method
(ASTM)
Bulk density g/cm 3 1. 75-1.84 C-559
Specific resistance µom 3. 4-4. 5 C-611
MPa 14.0-20.0 Tensile strength
PSI 2100-2900 C-749
Coefficient of x10-
6/ ° C 0-0.3 PATE*
thermal expansion
* PATE is a GrafTech invention for accurately measuring the coefficient of thermal expansion.** Displayed properties values are typical ranges and not a guarantee for individual electrode properties.
MAIN PROPERTIES
Bulk Density
A measurement of weight per unit volume. A higher bulk density will generally be
reflected in improved mechanical properties.
Specific Resistance
The electrical resistance of a unit length of graphite. One of graphite's useful
properties is that electrical resistance does not increase strongly with tempera
ture. Up to 1400°
C, the electrical resistance is lower than it was at room tempera
ture.
Flexural Strength
The maximum stress which the material will withstand before rupture in bending (also
called Bending Strength or Modulus of Rupture). Higher flexural strength in elec
trodes will generally result in lower electrode breakage frequency.
Note: As graphite is a brittle material, GrafTech uses the ASTM 4-point bending test,
which gives more reliable results but values about 25% lower than the 3 point method
used by some graphite suppliers.
Tensile Strength
A measurement of pure tensile force per unit area required to cause rupture by pulling
apart. Higher tensile strength in pins will generally result in lower pin breakage
frequency. Graphite's strength characteristics increase significantly with temperature.
Coefficient of Thermal Expansion (CTE)
A measurement of the increase in length per unit length per degree rise in
temperature. Lower CTE will give better resistance to thermal shock. Also, CTE
compatibility between the graphite electrode and the connecting pin is important
for satisfactory performance of the electrode joint.
Ash Content
UCAR® Graphite Electrodes typically have less than 0.1 % impurities,
and do not contain elements harmful to steelmaking.
- -,
' I I -
-' I T -
- --
' - -- -I I I I I I I I J
I- I I I -, -
-
I -
Graphite Electrode Selection The following operating considerations must be addressed before
selecting the electrode size and grade for a particular application.
• Production / • Charging Practice • Water Spray Rings
Productivity Goals • Power Level • Fume Control System
• Furnace Design • Current Level • Graphite Electrode
• Steel Type and Grade • Slag Practice Consumption Goal
• Charge Material • Burner/ Oxygen
Practice
GRAPHITE ELECTRODE SELECTION GUIDE {Metric2 GRAPHITE ELECTRODE SELECTION GUIDE En lish Select Electrode
Electrode Length Options Pin Options Select Electrode
Diameter Electrode Length Options Pin Options
Diameter
Typ ica l We ight IEC Typi ca l We ight IEC
Min Max Min Max of PRE-GET' " Diameter Length Threads Min Max Min Max of PRE-GET TM Diameter Length El ectrode Designation El ectrode Designation per
per inch mm mm mm mm mm mm k mm 25.4mm Inches Inches Inches Inches Inches Inches Pounds Inches
750 762 765 2700 2680 2900* 2250 406T4L 406.40 685 . 40 4 30 30. 00 30. 12 110 105. 51 114. 17* 4950 406T4L 16. 00 26. 98 4
406T4N 406. 40 603 . 60 4 406T4N 16. 00 23. 76 4
700 711 714 2700 2680 2900* 1940 374T4L 374. 65 558. 80 4 28 27. 99 28. 11 110 105.51 114. 17* 4268 374T4L 14. 75 22. 00 4
2400 2325 2525 1700 374T4N 374. 65 457. 20 4 96 91.54 99. 41 3740 374T4N 14. 75 18. 00 4
650 660 663 2700 2680 2900* 1650 355T4L 355. 60 558.80 4 26 25 . 98 26. 10 110 105.51 114. 17* 3630 355T4L 14. 00 22 . 00 4
2400 2325 2525 1450 355T4N 355. 60 457. 20 4 96 91 . 50 99 . 40 3190 355T4N 14. 00 18. 00 4
600 610 613 2700 2680 2900* 1410 317T4EL 317. 50 558.80 4 24 24. 02 24. 13 110 105.51 114. 17* 3102 317T4EL 12.50 22. 00 4
2400 2325 2525 1250 317T4L 317.50 457. 20 4 96 91 . 54 99 . 41 2750 317T4L 12. 50 18. 00 4
2100 2045 2225 1080 317T4N 317.50 355. 60 4 84 80.51 87.60 2376 317T4N 12. 50 14. 00 4
550 559 562 2700 2680 2900* 1180 298T4L 298. 45 457. 20 4 22 22 . 01 22. 13 110 105. 51 114. 17* 2596 298T4L 11. 75 18. 00 4
2400 2325 2525 1050 298T3L 298. 45 457. 20 3 96 91.54 99. 41 2310 298T3L 11 . 75 18.00 3
2100 2045 2225 910 298T4N 298. 45 355. 60 4 84 80. 51 87. 60 2002 298T4N 11 . 75 14. 00 4
500 508 511 2400 2325 2525 870 273T3L 273. 05 457. 20 3 20 20. 00 20. 12 96 91 . 54 99 . 41 1914 273T3L 10. 75 18. 00 3
2100 2045 2225 760 273T3N 273 . 05 355. 60 3 84 80. 51 87. 60 1672 273T3N 10. 75 14. 00 3
1800 1745 1905 690 269T4L 269 . 88 457. 20 4 72 68. 70 75. 00 1518 269T4L 10. 63 18.00 4
269T4N 269. 88 355. 60 4 269T4N 10.63 14. 00 4
450 457 460 2400 2325 2525 700 273T3L 273. 05 457. 20 3 18 17. 99 18. 11 96 91. 54 99.41 1540 273T3L 10. 75 18. 00 3
2100 2045 2225 620 269T4L 269.88 457. 20 4 84 80. 51 87. 60 1364 269T4L 10. 63 18. 00 4 1800 1745 1905 530 241T4L 241 . 30 355. 60 4 72 68. 70 75. 00 1166 241T4L 9. 50 14. 00 4
241T3L 241 . 30 355. 60 3 241T3L 9. 50 14. 00 3 241T3N 241.30 338. 70 3 241T3N 9.50 13.33 3
400 406 409 2400 2325 2525 550 241T3L 241 . 30 355. 60 3 16 15. 98 16. 10 96 91 . 54 99. 41 1210 241T3L 9. 50 14. 00 3 2100 2045 2225 480 241T3N 241 . 30 338. 70 3 84 80. 51 87. 60 1056 241T3N 9. 50 13. 33 3 1800 1745 1905 420 222T4L 222. 25 355. 60 4 72 68. 70 75. 00 924 222T4L 8. 75 14. 00 4
222T4N 222. 25 304. 80 4 222T4N 8. 75 12. 00 4 215T3N 215.90 304.80 3 215T3N 8.50 12.00 3
350 352 358 2100 2045 2225 370 215T3N 215. 90 304. 80 3 14 13. 86 14. 09 84 80. 51 87. 60 814 215T3N 8. 50 12. 00 3 1800 1745 1905 310 203T4L 203. 20 304. 80 4 72 68. 70 75. 00 682 203T4L 8. 00 12. 00 4
203T4N 203. 20 254. 00 4 203T4N 8. 00 10. 00 4 177T3N 177. 16 270.90 3 177T3N 6. 97 10. 67 3
300 303 307 1800 1745 1905 230 177T4N 177. 80 215. 90 4 12 11 . 93 12. 09 72 68. 70 75. 00 506 177T4N 7. 00 8. 50 4 177T3N 177. 16 270. 90 3 177T3N 6. 97 10. 67 3 155T3N 155. 57 220.00 3 155T3N 6. 12 8. 66 3
250 251 256 1800 1905 160 155T3N 155. 57 220. 00 3 10 9. 88 10. 08 72 68. 70 75. 00 352 155T3N 6. 12 8. 66 3 1500 140 152T4N 152.40 190.50 4 60 58. 66 64. 96 308 152T4N 6. 00 7. 50 4
* Longer maximum length avai I able to many 110 inch customers
Graphite Electrode Selection GradeAGX™:
Your GrafTech Technical
Service Engineer can help
you decide which type of
product best suits your
existing or future needs.
The standard grades can
be refined to meet your
special needs.
A premium grade recommended for high power,
ultra-high power and DC furnaces operating under
severe electrical, mechanical and/ o r thermal
conditions. AGX ™ can also be used for ladle furnace
applications.
GradeAGR: A standard grade for applications where operating
conditions are not severe .
Current Carrying Ranges for Ladle Furnace Applications 70
60
50
~ 40 i::: Q)
~ 30 u
20
10
0
mm inches
250 10
300 12
350 14
400 16
Electrode Diameter
450 18
500 20
These are typical current carrying
capacities as observed in present
use of GrafTech electrodes around
the world. More severe operating
capacities and unusual applications
may differ and require investigation
by your GrafTech Technical Service
Engineer to define a product to
meet your requirements.
Current Carrying Ranges for Electric Arc Furnace
160 - - - - - - - - - - - - ; _ - - - - - - - - -; - - - - -(- - - - - -(- - - - - - - - - - -(- - - - - - - - - - -:- - - - -. .
140 - - - - - - - - - - - - : - - - - - - - - - - ~ - - - - -:- - - - - ~ - - -- - - - - - - -;- - - - - - - - - - -:- - - - -. . 120 - - - - - - - - Typical Current
Carrying Ranges
100 - - - - - - - - - - - - '. - - - - - - - - - - ; - - - - -;_ - - - - ~ - - - - - - - - - - -(- - - -
80 - - - - - - - -- - __ '._ -------- -i--- --(------:-- ----
60 - - - - - - - - - - - - ~ - - - - - - - - - - : - - - - _:_
40 - - - - - - - - - - - - ~ - - - - - - - -
20 - - - - -
inches 8 mm 200
12 300
16 400
20 500
Electrode Diameter
24 600
28 30 700 750
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