This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
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.
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
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
* 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