Electric Arcand LadleFurnaces Are trademarks of the

Techint Group

As part of the

Techint Group that

operates worldwide

through more than

100 companies,

Techint Technologies

provides a wide range

of products and services

for the steel and related

industry. Exchanging of

know-how and expertise

is a common practice

within the Techint

Group:Tagliaferri and

Lectromelt, well known

trademarks in

the electric furnace

activities, work in

close association with

engineering, construction

and steel-making experts

of the Techint companies.

Our main offices are

located in Italy and USA.

Tradition, expertise andsteelmaking background

Clear design philosophy

Always innovative furnacedesign: some highlights

Tagliaferri and Lectromelt have designed andmanufactured electric arc furnaces since thebeginning of electrometallurgy. Process and productknow-how have increased continuously, leading to thetop technologies and equipment for successfulsteelmaking.

As a steelmaker,Techint holds in-house know-how ofsteel making and is able to fulfil the customer’s mostdemanding expectations.Techint Technologies is theideal partner for steelmaking equipment andtechnologies.

The design concept is intrinsically simple, for reliable,very sturdy and long-life furnaces.Actually, they mustwithstand extreme stresses as well as high thermalloads in order to work properly in a very severeenvironment.

Design simplicity also means customer’s satisfactionin terms of easy daily handling of the furnace.Operators can readily understand the furnaceworking mode and the related circuits.Whenmaintenance is required, it can be performed simplyand fast.

All modern technologies for steelmaking areimplemented in Tagliaferri-Lectromelt furnaces.Thisenables efficient process and a large charge-mixrange. In other words, low cost production and highquality products.

Lectromelt pioneered the first top charge furnace.

Lectromelt developed the first power clamp.

Lectromelt supplied the largest electric arc furnaceever built with a 38 ft (11,6 m) shell diameter.

Tagliaferri was the first to introduce the hydraulicelectrode regulation system for fast accurate andreliable electrode positioning.

Tagliaferri’s Bottom Tapping Mechanism (TBT) is oforiginal design, providing tangential flap rotation forextremely safe and reliable tapping.

The furnace basic concept is unique, beingcharacterized by a roof lifting and swinging system,which is completely independent from the shellsupporting platform.

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Controlled environmental impact

Training programs, technicalassistance and after salesservice

Engineering services

Whether it is dust, fume, gaseous emissions, noise orelectric network disturbances,Tagliaferri andLectromelt provide all of the most advancedtechnologies in the field of environmental impactcontrol.

Techint Technologies supplies engineering of tailor-made solutions, including retrofits, upgradings,revampings or re-utilisation of existing equipmentfor optimized-cost solutions.

Techint Technologies engineers insertion,modification and/or replacement of single parts, forexample the electrode arms, the electroderegulation system or the TBT system.

Training programs are directed to personnel incharge of the operation and maintenance of thesupplied equipment.They include practical andtheoretical sessions to give the trainees knowledge oftechnologies, equipment functions, maintenance andoperational procedures.

Fast commissioning and quick learning curve can beguaranteed by Techint Technologies’ expertise andassistance.

Assistance continues after sales through acomprehensive spare parts service.A dedicatedinternal office is in charge of the satisfaction of theclients’ requests.

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COMPLETEFURNACEPACKAGES

Techint Technologies supplies complete furnacepackages consisting of technology and the equipmentfor all of the charging mix alternatives:

= 100% scrap, whether batch charged orcontinuously Consteel® charged

= up to 100% DRI or HBI continuouslycharged

= up to 50% hot metal, fed by special devices

A dedicated thermo-chemical package for eachinstallation, including:

= high thermal yield post combustionsystems

= side-wall, roof or door jet-burners= water-cooled and consumable lances for

oxygen and carbon injection= bottom injection and melt stirring systems

All the auxiliary plants in the meltshop area:= tailor-made slag formers and ferroalloys

addition systems.= automatic manipulators for sampling and

temperature measurement.= systems for uninterrupted foamy slag

monitoring and slag compositionadjustment.

= specially suited electrode nippling and handling devices.

= refractory gunning and fettling equipment.

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5

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AC and DCElectric ArcFurnaces

Tagliaferri-Lectromelt can provide both AC and DCelectric arc furnaces.The selection between the two different solutionsdepends mainly on the investment and operationcosts.Moreover, when a weak electric power supply grid isavailable, the choice can be highly influenced byother elements such as the need of an additionalStatic Var Compensator (SVC).

DC furnace shows proven advantages in terms of lowgraphite electrode consumption and reducednetwork disturbances (flicker level).

The last generation of AC furnaces has alsosignificantly reduced their flicker disturbancesthrough the introduction of the high impedancetechnology.Additionally the flicker level is dramatically reducedwhen the electric arc furnace,AC or DC, is operatingwith a continuous scrap feeding system as theConsteel® provided by Techint Technologies.

High impedance AC furnaces High impedance technologyimproves arc stability, allowsstable long arc operation,reduces electrodeconsumption and limits shortcircuit currents intensities.Series reactors on theprimary side of the furnacetransformer increase thecircuit inductance.

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Compact and rigid furnacedesign concept

The success of Tagliaferri-Lectromelt electric arcfurnaces is built on its sturdy mechanical structure.In fact, it is well known that a rigid system is theprerequisite for a successful performance in a harshenvironment.As vibrations and flexions areminimised, the electrode regulation is fast, of quickresponse and accurate. Moreover, electrodes are notsubjected to the bending stress of oscillating holdingarms.

The shell supporting platform has a very reducedextension.The shell rests on it centered by pivots butwithout attachment.This allows for free andindependent expansion and contraction of theplatform and of the shell.

TAGLIAFERRIS.p.A MILANO

ING. LEONE

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Melting and superheating After charging has been doneand melting starts only thefurnace superstructure ishooked directly to the shellplatform, the roof swing andlift system remainsdisconnected so that furnacerotation during tilting cantake place without interlockto it.

Electrode arms are short andtheir elastic inflexionnegligible, thus allowing anaccurate electrode regulation.They are built from thickbimetallic sheets. Steel(inside) is in charge of themechanical resistance whilecopper (outside) is thecurrent conductor.Their

closed section is completelywater-cooled and houses theelectrode clamping system,the pipe for spray waterelectrode cooling and the airblowing system for clampcleaning.The central arm body designprovides triangulararrangement in order tominimise the phase reactanceunbalance and achieve welldistributed power input ofthe electric arcs.

The electrode pitch diameteris extremely small.Therefore,the arc is far away from theshell walls so that they areless affected by radiation.

Charging To open the furnace, thesuperstructure is lifted upfrom the shell by anindependent swivellingsystem. As the rotation axisof this assembly is far fromthe furnace shell, the roofrotation angle is small, rangingfrom 55 up to 60°. Thus, roofopening is fast.Thanks to thesmall angle, the electric cabletwisting is avoided, too. Cablelife is greatly extended and

no articulation in the cables isneeded.

The furnace is designed toalways return by gravity tothe deslagging position, thus itcan be kept in level positionby two simple and heavy restbumpers.The rest stops,anchored to the concretefoundations, act directly asrockers’ stops and preventthe tilting cylinders fromshocks or impact loads duringscrap bucket charging.The roof lifting and swingingstructure do not experienceshocks during fall of scrap asit is disconnected from theshell carrying platform duringcharging.

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Tapping There is no need to lock theroof lifting and swingingstructure during tapping ordeslagging as it does notparticipate to platform tilting.

The Tagliaferri BottomTapping system (TBT) issturdy, simple and accurate.Aswinging flap, pneumaticallydriven through a cooled shaft,allows tight closure, easyopening and reliableoperation.The flap consists of just a stiffsteel plate rotatingtangentially to the furnacebottom surface so that italways follows its thermalexpansion.The driving system

can be easily disconnectedfrom the plug when removingthe shell so that no seconddriver is needed for the spareshell. Residuals around thetap hole are smoothly cut bythe tangential flap motion attaphole closing.Multiple mechanicalinterlocks prevent fromaccidental taphole opening.Moreover, there is adedicated air tank, which actsas a buffer for emergencysituations.

Backtilting of the furnace issimply accomplished bygravity. Fast return makes sureslag free tapping is achieved.

10

Maintenance The upper shell and furnaceroof are built with tubularwater-cooled panels.Tubesare generally made of steel,except for the panels justabove the slag line, which aremade of copper to enhanceheat transfer to the coolingwater in the extremely heatexposed areas.The panels arearranged in a cage, whichsimultaneously is the manifoldof the cooling water circuit.The water flow and outlettemperature of each panelcan be constantly monitored.

The water-cooled upper shellcan be easily split from thelower shell containing therefractory lining.The lowershell simply rests on therocker platform, centered bymeans of a couple of pivots.Therefore, shell removal andreplacement, if intended or

needed, can be easilyaccomplished in just a coupleof hours.

The roof is supported bywater-cooled horizontal arms,mounted on the furnacesuperstructure. It isconnected to the arms bymeans of four adjustable tie-rods and extractable pins. Ifmaintenance operations mustbe performed on the roof,pins are extracted and thesuperstructure is lifted up.The fume elbow lifted by theascending superstructure.Therefractory delta replacementcan be easily accomplished.Roof lifting cylinders are oforiginal design and arecharacterised by ease ofmaintenance because the V-seal can be replacedwithout disassembly of thecylinder.

11

Electrode supportingand bearing system

Tagliaferri and Lectromelt have coupled waterincompressibility in the hydraulic system with theright mechanics of the electrode bearing system tohave a package of high rigidity and high resonancefrequency. Vertical electrode shift is obtained by asingle-acting hydraulic cylinder, incorporated in theelectrode mast.

Electrode masts slide vertically, accurately guided bytwo series of rollers. Moreover, a number ofeccentrics allow column alignment by easy andaccurate setting. Electrode masts are provided withholes and relevant pins for their mechanical lockingduring furnace shutdown.

One centralized greasing system is provided for thecolumn guiding rollers. Just a small number of otherlubricated points requires manual greasing.

Electrode clamps are made of forged copper to allowhigh clamping forces for high pressure contact and,therefore, low electric contact resistance.Water-cooling channels are drilled inside the clamp body forefficient heat dissipation.The electrodes clampingforce is achieved by a series of spring washers. It canbe hydraulically released for electrode slipping orelectrode column change.

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Furnace hydraulics Tagliaferri pioneered the hydraulic electroderegulation of the furnace.A single circuit takes careof the electrode regulation as well as of all the otherhydraulically driven furnace movements.The workingfluid is simple:

= 95% water + 5% emulsifying oil for lowpressure operation (typically 64 bar)

= water glycol for pressure operation higherthan 120 bar

All working surfaces of the hydraulic components arehard-chromed in order to achieve long life.

The simplicity and reliability of the circuit is evidentby looking at its scheme.There is just one level ofpressure to manage, either low or high.

Accumulators are included in the circuit toguarantee the maximum operational regularity andto assure remaining operability in case of powerfailure.Thus, either the electrodes and the roof canstill be raised or the furnace still be tilted.

As water compressibility is lower than oil, thestiffness of the hydraulic circuit is greater.Consequently, accuracy of electrode control isoutstanding and all hydraulically driven movementsare of extremely quick response.

There are other relevant advantages related to theuse of water in the meltshop area as it isenvironment friendly, cheap and not flammable.

13

Electrode regulationsystem

Successful electrode regulation enables efficient andsmooth energy input. In fact, efficient power transferthrough the arc is realized provided the arc is stable.Arc stability depends on a great extent on asuccessful electrode regulation.

The core of the electrode regulation system isTagliaferri’s specially designed hydraulic distributor,controlled by a servovalve, which receives the signalsfrom a microcomputer.

Because the upward and downward electrode speedis proportional to the fluid flow in the cylinderlocated in the electrode column, fluid flow is offundamental importance.The distributor makes surethat, being its displacement proportional to the errorsignal, the area available for the flow changes inaccordance to the needs.Thus, in an error signal current/speed pattern thespeed curve is flat at small deviations from the setpoint but steep in case the correcting signals arehigh.This allows a very sensitive electrode regulation.

EAF ONE LINE DIAGRAM

PROTECTION AND MEASUREMENT

DIGITAL ELECTRODE REGULATOR

CONTROL FUNCTION

CONSTANT CURRENT

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Top level digital electronicregulation

Tagliaferri’s-Lectromelt’sdigital regulator makes surethat immediately after thefeedbacks of electrodevoltage and current signalsare analogically collected andsent to a fast sampling inputcard, all calculations betweenfeedback and output signalsare of digital type.Adoptionof digital components in theregulation loop providesseveral advantages. Setting ofall set points and coefficientsof the P.I.D. regulation loops isaccomplished through a MMI(Man Machine Interface)video terminal. Additionally,auto-diagnosis and alarmsignalling in case of fault,whether in hardware or insoftware components are ofhigh quality. Finally, the systemflexibility is greatly enhancedas future new functions canbe implemented by simplyadding new programme lines.

The furnace can be operatedwhether with constantimpedance, constant active

power input or constantpower factor.

All the components of theregulation system areassembled in a water anddust proofed control paneland supplied with its own airconditioning system.The regulator includes severalauxiliary functions:= Full downward electrode

speed until approachingthe arc zone.

= Electrode fast rise systemat short circuit situations.

= Electrode rise in case ofelectrode-touch on non-conductive material.

= Automatic currentreduction at transformertap changer movement.

= Self-adaption of theoperating electrical setpoints to the primaryvoltage fluctuations.

= Autocheck of the zeroposition of the hydraulicregulator and consequentcorrection through anoffset signal.

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The architecture of the system is hierarchical. All levels are interconnected:=Level 0: Field equipment=Level 1: Basic Automation (Level 1/A) and Process Supervision (Level 1/B)=Level 2: Process control=Level 3: Plant Management and Production Planning

Communication among levels is accomplished by means of serial lines or high-speeddata links (e.g. Local Area Network). Level 1/A interacts directly with the process, eitherautonomously or according to the directions from Level 1/B or Level 2. It includes PLCs,dedicated microprocessors and smart instrumentation.The basic automation carries outfunctions of primary process data acquisition (status, measurements, etc.), sequentiallogic, alarm processing and handling, regulation and direct actuation towards theprocess.

At Level 1/B, the automation implements the operator interface (MMI), i.e. a set offunctions which enable the operators in the control room to handle and control theLevel 1/A devices in charge of each plant.Workstations include printers, colour videoterminals or TFT technology, as well as control desks and panels.

Level 2 coordinates and/or controls the Level 1 equipment to which it is connected.The Process Control system enables the operator to control in a centralized way thefunctions performed by the lower-level subsystems.The level includes PCs, minicomputers and the related peripherals.

Process Control supports technological and production data acquisition/elaboration,pre-set and set of machines/plant, working parameters prediction, operator guidance,numerical models and interchange of information with an eventual higher level systemor external system.

Automationand processcontrol

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Level 1 PLCs operate andinterlock the EAF

PLCs activate logic sequencesfor the operations of variousparts of the EAF. Theseoperations are interlocked toensure safety and correctsequencing.

In addition, PLCs carry outseveral automation functions:= collect signals from the

field= control signal transfer to

the field, typically to

electrovalves and motors= communicate with MMI= receive the liquid steel

temperaturemeasurement results

= collect cooling watertemperatures and flowsdata

= collect EAF operatingelectrical parameters

= collect signals related tothe energies (electrical andthermal) entering the EAF

= collect alarm signals

MMIs guide the operatorduring the heat

MMI functions are grouped inthe following classes:

= supervision of equipmentstatus through variousproduction phases

= operator guidance byproducing pages ofsummarized data oroperating practice pages foreach steel grade to bemanufactured

= data base storage, e.g. steel

grades data base, powerprofiles and settingparameters. In particular,steel grades tables containthe main parameters ofthe steel to bemanufactured like rangefor chemical components,range of tappingtemperature, basic powerprofile, basic additions andtables of operatingpractices.

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The melting and refiningprocess is continuouslyfollowed and controlled

The Process Controlmonitors the different phasesof the melting process, fromcharge preparation totapping. Main functions of thecontroller are:

= automatic meltdowncontrol, in terms ofgeneration of a suitablemelting power profile.Power profile is divided ina number of melting steps,with associatedtransformer tap changerposition, electrode currentset points and stabilityfactor of the regulationloop.

= charge compositionmonitoring

= calculation of electric andthermal energyconsumptions, includinggas and oxygen as well asslag formers

= calculation of stirring gasconsumption

= liquid steel temperaturemeasurement andcalculation.The calculationis made taking intoaccount the electricenergy input and thelosses due to fumes, watercooling and heat transferthrough the walls.

= analysis collection andrecording

= voltage and current setpoints to electroderegulator

= power on/power off timesrecording

= calculation of furnaceelectrical parameters

= signalling of particularevents to the operator

= feedback signals from theEAF, for example bathtemperature, foamy slag,etc.

Heat and production reportsare generated

Data stored during meltdown and refining operationsare summarized at the end ofthe heat in a general report.The report includes, forexample, basic heatinformation, codes, summaryof the charges, energyconsumption records foreach phase, consumption

indexes, chemical analysis andsteel temperature,productivity indexes andinterruption/faults records.

Each report is transmitted toa central computer forproduction accounting over atime period.

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The DC bottomelectrode system

A design of a bottom electrode has been patented toensure that high electric performances are inoptimized interaction with the refractory material.The consumable part of each of the bottomelectrodes consists of a steel tube with a refractorycore.The steel pipe melts but the refractory coreavoids quick melting and lowering of the moltenfront; a steady state is reached.The steel tube iswelded to a water cooled copper head, which carriesthe current to the furnace bottom. Electrodeconsumption is monitored by thermocouples on theshell bottom plates around the electrodes.Also, thecooling water temperature is monitored. If moltenlead penetrates between the bottom electrode andthe refractory material, it is drained away from thebottom electrode insulation in order to avoidelectrical contact between the electrode and thefurnace shell.Basically, flexible cables and current bus tubes arearranged underneath the shell bottom in asymmetric pattern, namely four perpendicular ways.Therefore electromagnetic forces are self-balancedand the electric arc is vertical. No correcting coilsare required underneath the shell.

The four electrodes have independent currentregulation.This is accomplished by four thyristorrectifier banks and four current regulation loops.Residual arc deflection can be corrected byunbalancing the current intensities.

Furnace refractory and bottom electrodemaintenance is very simple.The shell isinterchangeable and can be removed withoutunscrewing the electric connection under thebottom.This is possible as electric contact betweenbottom busbars and cable heads is assured simply byshell resting on the tilting platform.The timerequired for a shell replacement is the same as theone for an AC furnace.

Refractory materials employed for the furnacebottom and walls are similar to those of AC furnaces.The electrode refractory rings dismounting andinstallation practice is similar to the procedure ofexchange of an eccentric bottom taphole refractoryset.

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Ladle Furnaces

Know-how for ladle metallurgy Ladle metallurgy stations fulfilseveral functions after tappingin order to prepare the meltto be processed in theContinuous Casting Machine:

= Temperature andcompositionhomogenization

= Carburization= Desulphurization

= Alloys addition= Adjustment of the

chemical composition= Setting the content and

shape of inclusions= Accurate setting of the

casting temperatureSimultaneously, ladle furnacesact as a buffer between EAFand CCM, thus smoothingand optimizing the processflow.

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Facilities for flexibleladle metallurgy

Each heating station is equipped with the units for anenhanced ladle metallurgy:

=gas stirring system=wire injection machines=temperature, carbon and oxygen measurement

lancesLayouts are studied to allow installation of additionalcomponents, typically a Vacuum Degassing (VD) unit.

Ladle furnace designconcept

Completely water-cooledfurnace hood

During the heating phase, theladle is covered with a watercooled roof of tubular type.Water temperature of eachsection is monitored bytemperature sensors on theoutlet circuits.

The roof is movable in thevertical direction, in order toallow proper positioning ofthe ladle under the furnace.Roof rise is carried out by asingle hydraulic cylinderthrough chains and pulleys. Bythis way, the hood is perfectlyhorizontal when approachingthe ladle.

Due to the principle ofindirect fume suction, a gap isintentionally providedbetween the roof and ladle,

so that correct positioning isalso accomplished in case theladle borders are not totallyclean.A pressure sensor inthe working cylinder makessure the hood is placed asclose as possible to the ladleborder.Several openings areprovided in the ceiling of theroof in order to allocate thevarious accessories of theladle furnace.Theseaccessories include: chute foralloys addition, lances forsampling and temperaturemeasurement, inspectiondoor, emergency top stirringlance and wire injectionsystem. Openings areprovided with remote controlclosing flap to prevent airintake or fume escape.

Ladle furnaceinstallations

Tagliaferri andLectromelt offercomplete ladle furnacepackages includingelectric power supply,ladles, ladle transfercars, additives chargingand injection systems,dedusting and all theauxiliary equipment forthe related area, e.g. theelectrode make-upstations.

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Electrode positioning Electrode vertical movementis provided by a single-actingcylinder incorporated in eachelectrode mast. Masts areguided by adjustable rollers atthe top and bottom of eachcolumn.The guide rollers are

lubricated by a centralizedsystem and shielded from gritand dust.

Electrodes are independentlypowered by the Tagliaferrihydraulic regulator, which iselectronically piloted.

Extremely small electrodepitch diameter

The electrodes are arrangedon a small diameter circle,thanks to the specialarrangement of electrodeholding arms.The arms arecompletely water-cooled andtheir triangulation leads to awell balanced power input.

The electrode clampingmechanism is housed in thearm body.The electrodes areclamped by springs andhydraulically released, forsafety in case of power failure.

An integrated compressed airblowing system providesclamp cleaning beforeclamping the electrodes.

Ladle furnacehydraulics

Furnace movements and electrode regulation areboth carried out by means of hydraulic cylinders.Theworking fluid is water-based, synthetic and non-flammable.The hydraulic components’ workingsurfaces are thickly chromed.

In case of electric power failure, the electrodes areautomatically raised to the top position.

22

Emission controls

Indirect fume evacuationprotects from steel bathoxidation

The fume suction system hasbeen specially designed tostrictly avoid the circulation ofair inside the ladle furnace. Inprinciple, fumes are notsucked directly from thefurnace.Conversely, evacuation isoperated on the surplusfumes leaving the furnace,either from the roof gap orfrom the electrode holes.

Successful fume evacuation isachieved through a careful

balance of the depressions inthe following areas:

= circular duct around theladle roof

= cylindrical hoods aroundthe electrodes

The cylindrical electrodehood can be either water-cooled or provided with aninternal refractory lining.Refractory rings are arrangedaround the electrodes tomaximize hood sealing.

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LF Electroderegulation system

Top level digital electronicregulation

Tagliaferri’s-Lectromelt’sdigital regulator makes surethat immediately after thefeedbacks of electrodevoltage and current signalsare analogically collected andsent to a fast sampling inputcard, all calculations betweenfeedback and output signalsare of digital type.Adoptionof digital components in theregulation loop providesseveral advantages. Setting ofall set points and coefficientsof the P.I.D. regulation loops isaccomplished through a MMI(Man Machine Interface)video terminal. Additionally,auto-diagnosis and alarmsignalling in case of fault,

whether in hardware or insoftware components are ofhigh quality. Finally, the systemflexibility is greatly enhancedas future new functions canbe implemented by simplyadding new programme lines.

The furnace can be operatedwhether with constantimpedance, constant activepower input or constantpower factor.

All the components of theregulation system areassembled in a metallicboard, water and dustproofed and supplied with itsown air conditioning system.

Successful electrode regulation enables efficient andsmooth energy input. In fact, efficient power transferthrough the arc is realized provided the arc is stable.Arc stability depends on a great extent on asuccessful electrode regulation.

The core of the electrode regulation system isTagliaferri’s specially designed hydraulic distributor,controlled by a servovalve, which receives the signalsfrom a microcomputer.

Because the upward and downward electrode speedis proportional to the fluid flow in the cylinderlocated in the electrode column, fluid flow is offundamental importance.The distributor makes surethat, being its displacement proportional to the errorsignal, the area available for the flow changes inaccordance to the needs.Thus, in an error signal current/speed pattern thespeed curve is flat at small deviations from the setpoint but steep in case the correcting signals arehigh.This allows a very sensitive electrode regulation.

Electric Arc Furnaces are the core of a mini mill supplied by Techint Technologies.Additionally,TechintTechnologies is the combined strength ofleading trademarks inthe field of equipment forthe total package ofsteelmaking, casting,rolling, reheating andproduct processing.

Techint Group throughthe DST companies(Dalmine, Siderca andTamsa) is the world leader in seamless tubes’manufacturing. Moreover,Siderar and Sidor aremajor producers of flatsteel products in LatinAmerica.Worldwide theGroup produces over 8 million tons of steel peryear.

Techint companies also provide a full range of services, including feasibility studies, project financing, project management, basic and detail engineering, procurement, construction, start-up, and technical assistance in operation and maintenance.

Techint Technologies Complete Systems for the Metal Industry

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For further information please contact

Steel Plant Division

Via Leonardo da Vinci, 2021053 Castellanza (VA) / Italyphone: +39 0331 444 557fax: +39 0331 444 547E-mail:meltshops@techint.it

Techint Technologies Inc.Cherrington Corporate Center100 Corporate Center DriveCoraopolis, PA 15108-3185 / USAphone : +1 412 262 2240fax: +1 412 262 6090E-mail:info@techint-tech.com

www.techint-tech.com

Techint Compagnia Tecnica Internazionale S.p.A.Headquarters:Via Monte Rosa, 93 - 20149 Milano, Italy

phone: +39 02 4384.1- fax: +39 02 4693026 - E-mail: techint-milano@techint.it

Are trademarks of the Techint Group