Broad Base. Best Solutions.

Carbon Electrodes – Performance Products for Non-Ferrous Arc Furnace Applications

Carbon Electrodes

SGL Group – The Carbon Company

We are SGL Group – The Carbon Company, one of the worldwide leading manufacturers of carbon-based products.

We have in-depth materials, production, applications and engineer-ing expertise, a comprehensive graphite and carbon fiber-based product portfolio, and an integrated value chain from carbon fibers to composites. We operate close to our customers through a global sales network and state-of-the-art production sites in Europe, North America and Asia.

With this Broad Base, we offer Best Solutions to our customers with the help of our company philosophy of SGL Excellence.

Our Business Line “Graphite and Carbon Electrodes” manufactures graphite electrodes for the production of steel in electric arc furnaces and carbon electrodes for use in non-ferrous arc furnace applica-tions.

c We work in close cooperation with the worldwide leading companies of the steel, silicon and phosphorus industries via local sales organizations in more than ninety countries

c We offer decisive competitive advantages with a wide range of comprehensive services accompanying our electrodes to our customers

c We ensure the highest quality standards

c We are innovative in product and process development and strive to deepen our customer relationships as value supplier

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Ensure the best results The unique characteristics of carbon electrodes allow them to carrylarge amounts of electric current at very high temperatures while maintaining excellent mechanical stability. Therefore, they are used as electric current conductors in non-ferrous arc furnaces where silicon metal, elemental phosphorus or other specialties are produced.

Carbon Electrodes Made by SGL Group

Main applications

c Silicon metal for the aluminum and chemical industries

c Refined silicon metal for the semiconductor and solar industries

c Phosphorus, as parent compound for the chemical industry and phosphor alloys in metallurgy

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Carbon electrodes have to withstand > 2000 °C in various furnace applications

Silicon metal is the base material for refined crystalline silicon used

in solar cells

Carbon Electrodes Custom-Made Solutions

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SGL Group currently produces electrodes with diameters from 800 to 1400 mm (31”- 55”) and lenghts of up to 3500 mm (138”); they weigh up to 7.0 tons (15,500 lbs).

Nominal diameter

Nominal length (incl. cone)

Approx. weight

[kg][inches][inches] [mm][mm]

800850890900960

10181060

1146

1205

1272

1320

1400

2800280028002800280028002800280030003200290031003300290031003300290031003300300032003400

2050230024502500290031503500385041504500455049005300455049005300520056006050611066007050

313335

35½384042

45

47

50

52

55

110110110110110110110110118126114122130114122130114122130118126134

Typical dimensions of carbon electrodes

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Property

Apparent density

Spec. electrical resistivity1)

Flexural strength1)

Ash content

Unit

g/cm²

Ω µm

MPa

%

Test method

ISO 12985-1

ISO 11713

ISO 12986-2

DIN 51903

Typical valueGrade P

1.63

25

7

1

Typical valueGrade S

1.62

36

7

2.5

Typical properties of carbon electrodes

Length

For minimum 85 % of an order: total length (cone included) in the range 2610–2930 mm

Diameter

Customized tolerances are available on request

Typical electrode tolerances

Our male/female joint design has been optimized to improve strength and reduce thermally induced stresses

Each carbon electrode is machined with high precision to customer's specification

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Custom-Made Handling Equipment Optimize your Process

In cooperation with the Piccardi company, SGL Group has developed specially designed lifting and tightening equipment for handling such large electrodes.

Balancing ringIt is used to pick up and transport carbon electrodes to the furnace. The self-lowering design permits preliminary mounting of the new electrode on top of the column.

Double tightening ringEspecially designed to tighten the new carbon electrode to the recommended torque.

SGL Group enjoys long-lasting relationships with its customers. Our wide range of services is well known and appreciated throughout the world. Our customers’ different operating conditions are carefully analyzed in order to provide the most suitable electrode grade and equipment for their use. We practice quality control with modern equipment and well-trained specialists. Technical assistance is avail-able on demand before and after the delivery of the material.

Long-Lasting Relationships and Technical Competence

Product developmentSGL Group has more than 100 years of experience in the manufac-ture and supply of carbon electrodes. Over the years we have worked to increase the quality of our amorphous carbon electrodes.

In our Technology & Innovation Center in Meitingen our continuous improvement efforts ensure that our electrodes meet the ever-growing requirements of our customers.

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Technology & Innovation Center, Meitingen

Performance Products

SGL CARBON GmbH

Rheingaustraße 190 - 19665203 Wiesbaden/Germany

www.sglgroup.com

04 2009/1 E Printed in Germany

This document is based on our best current knowledge and is intended to provide information on specific properties of our products and their applications. The above data have been obtained under laboratory conditions by employing the test methods described. This information should not, therefore, be taken as guaranteeing specific properties or the suitability of the product for a specific application under working conditions unknown to us. In particular, the specific data should not be taken as a warranty for the durability or performance of a product in the stated application. SGL Group cannot assume any liability in respect thereof. Any existing intellectual property rights must be observed.

Carbon Electrodes

SGL CARBON GmbHWerner-von-Siemens-Straße 1886405 Meitingen/GermanyPhone +49 8271 83-1568Fax +49 8271 83-1413CE@sglcarbon.de

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