HOT STRIP MILLS Modernization concepts

HOT STRIP MILLSHOT STRIP MILLSModernization concepts

METALLURGICAL PLANT and ROLLING MILL TECHNOLOGY

Hot Rolling Mills

SMS metallurgy

Hot Strip MillsSMS SIEMAG

2

ADAPTING existing hot strip

mills to present-day market

requirements

Owing to their size and high investmentvolume, hot strip mills have an extremelylong life. Almost 40 % of the 140 conven-tional hot strip mills currently in operationall over the world were built between1960 and 1970. At that time, these millswere designed as fully continuous orthree-quarter continuous mills featuring 5to 7 roughing stands. Today’s mills attainannual productions between 3 and 5.5million t in semi-continuous operationwith 1 to 2 roughing stands. In addition,mechanical equipment, drive technologyand process automation systems havebeen enhanced. Latest-generation hotstrip mills with their lower power demandand higher productivity are able to pro-duce at lower cost, with novel technolo-gies resulting in an even better productquality.

Flexible concepts developed by SMSSiemag allow older hot strip mills to bemodernized such that they meet today’smarket requirements in exactly the sameway as latest-generation mills. This alsoapplies to the rolling of many innovativematerials with the required dimensions.

More than 50*) new mills and a largenumber of modernizations carried out onmore than 50*) hot strip mills over thepast 15 years alone are evidence of ourvast experiences.

We implemented many of these projectsinclusive of electrical equipment andautomation systems. Since 1990, wehave built and successfully commis-sioned Level-1 and Level-2 automationsystems for more than 40*) hot stripmills (new plants and modernizations).And in addition to automation, completeelectrical equipment has been part of oursupply package for a number of yearsalready.

From these many modernizations jobs,four examples are presented in the fol-lowing which were carried out in recentyears and which featured very differentrequirements and design versions.

*) as per December 2005

Vast EXPERIENCESVast EXPERIENCESwith modernizations

3

CONTENTS

Vast experiences with modernizations 2 3

Requirements 4 5

Analysis and studies 6 7

Implementation concepts 8 9

Example: Hot strip millShanghai Meishan, China 10 13

Example: Steckel millOutokumpu Stainless 14 17

Example: Hot strip millSalzgitter Flachstahl 18 21

Example: Hot strip mill 1ThyssenKrupp Steel 22 23

References 24 27


4

REQUIREMENTSREQUIREMENTS

MARKET DEMANDS

on hot-rolled products

Over recent years, the use of innovativematerial concepts in the automotiveindustry has risen constantly. IF (intersti-tial-free) steels, owing to their excellentcold formability, are able to cope withboth maximal deep-drawing as well astensile stresses in the lower strengthrange. The strength of multi-phase steels(DP, TRIP, CP) is increased by incorporat-ing hard phases in the microstructure inaddition to soft phases. When used forthe load-bearing components of motorvehicles, these materials enable everlighter structures. On the one hand, thishelps save fuel while improving passivesafety on the other hand.

High-strength materials (for exampleS700M) are needed with thin final dimen-sions in the range of <2 mm. They areused, for instance, in components forbuilding-construction and mobile cranes(crane jibs). Soft steel grades are requiredin thicknesses down to 1 mm and thin-ner to replace products that have so farbeen cold rolled.

The geometrical tolerances range from1/4 to 1/2 of the relevant EN, ASTM or JISstandards. An excellent surface qualityis required mainly for autobody parts, tin-plate and rim steels.

All of these requirements have to be met by hot-strip suppliers under highcost pressure, while observing minimumdelivery times.

DEMANDS

on hot strip mills

The rolling mills consequently have tosatisfy the following requirements:

Raising productivity by increasingyield and availability, and by cuttingdown on maintenanceImproving the product quality, forinstance, by meeting close thicknessand profile tolerances through power-ful control or adjusting elementsMore flexible rolling schedules tosafeguard short delivery times andeconomical rolling of smaller lot sizes

Elon

gatio

n af

ter f

ract

ure

(%)

Tensile strength (MPa)

Dual-phase steels

Complex-phase steels

Martensitic steels

TRIP steels

Single-phase steels

Multi-phase steels

Properties of conventionaland novel steel grades.

Example of a modern hot strip mill.

5

Example of the use of novel steelgrades (TRIP steel).

Example of the use ofnovel steel grades.


6

ANALYSIS and STUDIESANALYSIS and STUDIES

ANALYSIS OF CUSTOMER

REQUIREMENTS

Older rolling mills which do not or notfully meet these requirements can bebrought up to the level of state-of-the-artfacilities through adequate modernizationmeasures.

Mill users employ different methods todetermine the required modernizationextent.

Some users decide on the basis of ownanalyses which plant components are tobe replaced, supplemented or upgraded.In such a case, inquiries to the plantbuilders contain concrete requests, e.g.for a new roughing stand, a new cropshear or for the reinforcement of thecoiler with clearly specified performancedata.

Other users specify their goals, e.g.increase in production, observance ofspecified target profiles or the productionof certain high-strength grades. Theyleave it to the plant builder to work out a tailored modernization concept withinthe scope of a study.

In any case it is the job and task of theplant builder to dimension the new facili-ties or those to be modernized, and todraw up suitable revamping steps.

Version B

Working out a perfectly custom-tailored revamp concept

Version A

Study to work out an optimalmodernization concept

Customer’s inquiry specifies goals, such as:- production increase by 15%- all finished-strip profiles 20 to 80 μm- production of high-strength grades with dimensions of 2 mm x 1,500 mm

Customer’s inquiry contains a list ofequipment to be modernized, such as:- new roughing stand- reinforcement of downcoiler- new crop shear

Dimensioning of new/modernized equipment

Simulation of rolling processes using state-of-the-art parallel-processor technology.

7

STUDIES

Studies for drawing up modernizationconcept or analyzing weak spots are tai-lored to the specific needs and require-ments of the customer.

Together with the analysis of the productspectrum, they determine the requiredforces and moments/torques of the plantcomponents.

The production analysis provides informa-tion on bottlenecks in the mill’s processchain which impede an increase in pro-duction. FEM analyses serve to investi-gate the static loads on and the dynamicbehavior of plant components. In con-junction with as-measured data from themill, dynamic simulations, for example of drive trains, provide an insight into thebehavior under extreme load conditions.

As a result, such a study makes propos-als for modernization measures to be car-ried out to meet the goals specified bythe customer.

Proposal for modernization measures

to be implemented

Making studies to work out

modernization concepts

- Analysis of the product spectrum (old/new)

- Analysis of the production and spotting of bottlenecks

- Determination of required forces, moments/torques, setting ranges

- Strength analyses of relevant plant components

- Dynamic simulations

0

200

400

600

800

Prod

uctio

n in

t/h

Final strip thickness

DD11 S235 FurnaceRoughing millFinishing mill

1,80 2,50 3,50 4,50 5,50 7,50 12,0

FEM strength analysis. Finishing mill F1 – F3, total rolling force (Fw) = 45,000 kN.

Identification of productionbottlenecks.


8

IMPLEMENTATION CONCEPTSIMPLEMENTATION CONCEPTS

CONCEPTS

The implementation of modernizationprojects necessitates immense experi-ence in this field and close cooperationwith our customers. Consistent projectmanagement safeguards the quality ofthe individual components and meetingof the scheduled deadlines.

The actual state of the mill is preciselyrecorded, and the design and construc-tion of the new facilities and of those tobe modernized are adapted to existing

foundations and other local conditionswith the required amount of creativity. This, together with other suitable mea-sures, enables minimum shutdown timesfor the installation of new or the revampof existing equipment.

New facilities are completely assembledand piped in our workshop. All move-ments are initially performed mechani-cally and hydraulically, and the automa-tion system is also frequently tested inthe shop for optimization of the controlparameters.

Prior to installing the facilities in the pro-duction line, extensive tests are run toensure that the plant attains the plannedproduction and quality level within mini-mum time after revamping.

MILL SHUTDOWNS

The shutdown periods are of particularimportance in modernization projects. So as to avoid surprises during the shut-downs, nothing is left to chance. Prepara-tory work during routine maintenancedowntimes and the installation of new orthe revamping of existing facilities duringextended shutdown periods (e.g. sum-mer shutdown) are carried out accordingto detailed time schedules.

The facilities assembled and tested inour workshop are put together in parallelto the production line as far as possibleand subjected to trial in “shadow mode”.Further tests are carried out after theyhave been installed in the line.

9

Preassembly of a heavy mill stand incl. functiontests in our workshop.

Contract month 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

START

Design

Procurement, manufac-ture and shop assembly

Transport to the site

Plant shutdown(~ 24 h)

Removal of existingequipment

Foundation work

Installationof the new coiler

No-load test

Startupand optimization

With reference to a number

of modernization projects

implemented by us, we

wish to show how 30- to

40-year-old hot strip mills

can be modified to meet

today’s market require-

ments and brought up to

the performance level of

new mills.

Rough time schedule ofa project.


10

HOT STRIP MILLHOT STRIP MILL Shanghai Meishan, China

The hot strip mill of Chinese steelmakerBaosteel Group Shanghai Meishan Corpo-ration Ltd., Shanghai Meishan for short,had been in operation in Japan for 21years before it was dismantled there andrebuilt and put into service in Meishan,approx. five hours by car north-west ofShanghai, in 1994. The order for theextensive modernization of the finishingmill was placed with SMS Siemag in2000.

The goal of boosting production from 1.2to 1.8 million tpy was already achieved afew months after recommissioning. Witha daily production of more than 7,000 t,the annual production exceeds 2 million t.

The requested quality improvementswere also successfully proved within thescope of the acceptance tests. On com-pletion of the first revamp stage, SMSSiemag, in 2004, also received the orderfor revamping the roughing mill.

The targets are to raise production to 3 million tpy and to further improve thequality in terms of closer width tolerancesand more rolling stability by avoidingtransfer-bar cambering.

MAIN FEATURES

of the modernization

Stage 1

HGCF4 to F6 rolling force 30,000 kN

CVC PLUS

F1 to F6 stroke ±100 mm

Work roll bendingF1 to F6 bending force 1,200 kN per neck

New laminar cooling line52 microzones, 16 trimming zones

New runout roller table

New coilers 1 and 2Step Control, coiler 1 retractable

Stage 2

Descaler (primary)New 160 bar

Edger New edging force 7,000 kN

Roughing stand New rolling force 40,000 kN

CoilboxNew transfer-bar thickness 20 to 40 mm,

coiling speed up to 5.5 m/s

Crop shearNew 50 mm x 1,320 mm,

shearing force 9,600 kN

Descaler (secondary)relocation of existing descaler toin front of the new stand F0

Finishing stand F0New rolling force 38,000 kN

11

GOALS

Stage 1

• Increase of production from 1.2 to 1.8 million tpy• Improved hot strip tolerances• Better coil quality

Stage 2

• Boost of production from 1.8 to 3 million tpy• More rolling stability (avoidance of cambers)• Improved width tolerances

RESULTS

• Current production >2 million tpy• Thickness tolerance for strip thicknesses from

1.2 to 4 mm: 99 % of strip length �40 µm• Finished-strip temperature tolerance:

95.4 % within ±15 °C• Profile tolerance for strip thicknesses �2.5 mm:

±25 µm of setpoint value

• Startup scheduled for May 2006

Installation of a coilbox in the 2nd modernization stage


12

STAGE 1 of the modernization

at Shanghai Meishan

During a 37-day shutdown (40 days wereplanned originally), the finishing mill up tothe coiler was totally revamped. Hydrau -lic adjusting systems in the last threestands and hydraulic loopers ensure astable strip flow and improved thicknesstolerances. CVC PLUS shifting systems andwork-roll bending systems in all of thestands offer adequate setting ranges to

obtain the specified hot strip profilesfrom the beginning to the end of eachrolling campaign. Good strip flatnessalways has top priority.

The new laminar strip cooling system inco-action with a corresponding processmodel ensures the demanded materialproperties. The two new, fully hydrauliccoilers featuring Automatic Step Controltake care of straight-edged strip coiling at defined strip tension.

Cont’dShanghai Meishan hot strip mill

Hydraulic adjusting system. CVC PLUS shifting and bending system.

Descaler R1 R2 E4/R4 E5/R5 E6/R6 E0/F0 F1 F2 F3 F4 F5 F6 Coiler system

Finishing stands

1st modernization stage.

13

STAGE 2 of the modernization

at Shanghai Meishan

In the second revamping stage, the roughingmill is almost completely renewed. The twomain shutdown periods last 25 and 30 daysrespectively. The roughing stands R1 and R4 to R6 as well as the edgers E4 to E6 are replaced by a reversing rougher withattached edger. Roughing stand R2 will befurther used. The place of the old finishingstand F0 will be taken by a coilbox, and anew stand F0 will be arranged upstream of the finishing mill. The revamp job will be completed most probably in mid-2006.

2nd modernization stage.

New reversing stand; look at the edger.

NewDescaler R2 reversing stand Coilbox F0 F1 F2 F3 F4 F5 F6 Coiler system

Finishing stands


14

STECKEL MILLSTECKEL MILL Outokumpu Stainless, Finland

The extension of the Steckel mill of Outo-kumpu, Finland, is an example of a veryunconventional modernization job. Thecustomer’s goal was to boost the annualproduction of the Steckel mill from 0.8 to1.8 million t of stainless-steel strip.

MODERNIZATION STEPS

and PROJECT SEQUENCE

The drastic increase in production wasachieved by installing additional finishingstands downstream of the exit-sideSteckel furnace.

Furthermore, the old pneumatic coilerwas replaced by a hydraulic coiler withStep Control, and the laminar coolingsection was renewed.

During the first 2-day shutdown, theroller tables in the area of the plannedfinishing stands were suspended from aroller-table bridge installed above. Whileproduction was in progress, a foundationpit (1) was prepared in which the founda-tions for the drive motors and the standswere completed. On operator side, afoundation block was poured on top ofwhich the mill stands were almost com-pletely assembled (2). Together with thefoundation block, they were moved intothe line (3), aligned and arrested duringanother shutdown of 5 1/2 days.

Also during this shutdown, the newcoiler was put into service and the oldcoiler removed. The Steckel mill with thenew coiler attained its normal productionlevel just two days after the end of theshutdown.

The foundations and the facilities forchanging the rolls of the new standswere supplemented while productioncontinued (4).

After the following 2-week summer shut-down that was used to complete thestands, the new finishing stands weresuccessfully put on stream.

1 2

Contract signing ♦

Summer shutdown 2002

Installation of coiler / p

Year 200201 02 03 04 05 06 07 0

Before the revamp

After the revamp

15

ORIGINAL STATE

Production 800,000 tpy

Steel grades AISI 304, 316, 904L, 430

Thickness range 2.3 mm to 12.7 mm

Width range 800 mm to 1,625 mm

Coil weight max. 30 t; 22 kg/mm

GOALS

Increase of production to some 1.8 million tpy

MEASURES

• New automatic slab feed• New walking beam furnace• Installation of 3 new finishing stands• Provision of a new coiler• New cooling section• New Level-2 system and extension

of basic automation

3 4

preparation of stands

Introduction of stands / startup of coiler

Shadow operation Level 2

Summer shutdown 2004Commissioning of finishing mill

2 Year 2003 Year 2004

2 weeks 2 days

2 weeks

5 1/2 days

08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12


16

RESULTS

During a transition phase, productiontook place alternately in Steckel mode (5 or 7 passes on the Steckel mill stand)and in combination mode (3 passes onthe Steckel mill stand, 1 pass each onthe new finishing stands). As early as thesecond day after the summer shutdown,Outokumpu was able to produce its fullproduction spectrum again. Four weekslater was the successful premiere of roll ing in combination mode. The share of production rolled in Steckel mode de creased continuously until the end ofthe year, while production in combinationmode increased to the same extent.

The availability of the new facilities (me -chan ical equipment and automation) ofmore than 96 % during the first 14 weeksand more than 98 % during the following

12 weeks, which had been contractuallyagreed upon for test operation, was reli-ably achieved and rose to 99 % by theend of the optimization phase.

Today the mill is run mainly in combina-tion mode. Thicker strips – with thick-nesses over 5.5 to 7.5 mm; dependingon the width – are rolled in tandem mode(1 pass on the Steckel mill stand, 1 passeach on the new finishing stands).

SMS Siemag’s pass schedule model andthe profile, contour and flatness modelenhanced for this particular configurationtake care of calculating the set-up valuesfor the roughing mill, the Steckel mill, thenew finishing stands and the coiler.Thickness deviations at the strip head ofless than 100 µm underline the quality ofthe Level-2 system.

3rd Sept.2004

1st Oct.2004

1st Nov.2004

1st Dez.2004

1st Jan.2005

1st Feb.2005

1st

March

Process optimization

Productivity> 300 t/h

Steckel mode

Combination/tandem mode

Completeproduct spectrum

Pro

du

ctio

n

100 %

Cont’dOutokumpo Stainless Steckel mill

New coiler.

17

The new finishing standsare on stream.

Laminar cooling section.


18

HOT STRIP MILL

Sizing press.

HOT STRIP MILL Salzgitter Flachstahl, Germany

The hot strip mill of Salzgitter Flachstahl,Germany, which went into operation in1963, has been continuously adapted tothe ever increasing requirements of themarket. The most recent modernizationstarted in 2001 with the installation of a new sizing press, and was completedin 2003 with a new roughing stand withflanged-on edger and the provision ofCVC PLUS facilities and a work roll bendingsystem in finishing stands F2 to F5. A new automation system was alsoinstalled.

INSTALLATION of roughing

stand and edger

In terms of logistics, the installation ofthe new roughing stand and the newedger was the most demanding part ofthis modernization job. Within a shut-down period of just 18 days, the oldcomponents were dismantled, and thenew ones installed and fully put intooperation.

After the end of the shutdown, the millwent back into production as scheduled.And one week later, the mill alreadyattained 80 % of its normal productionlevel, thereby surpassing the verydemanding goal.

The roughing stand and the edger weremanufactured in our Hilchenbach work-shop and preassembled inclusive of allpipelines.

Then our commissioning team tested all the main movements of the stand and the edger including preoptimizationof the controls.

On completion of the workshop tests,the facilities were dismantled, reassem-bled next to the rolling line in Salzgitterand once again tested with the final elec-trical and automation systems. By adapt-ing the housing contour (in the designphase) of the new roughing stand, thefoundations remained almost unchangedafter the old stand had been removed.Thanks to an innovative concept, thetime needed to align the bedplates couldbe reduced from 36 to 12 hours. Theassembled new roughing stand with a

weight of approx. 850 t was moved onrails from the preassembly area to itsfinal position. The edger reached its finalposition in the rolling mill with the help ofa special lifting device and the baycranes.

The new roughing stand withattached edger.

19

GOALS

• Boost of production• Improvement of product quality• Increasing the share of high-strength

steel grades• Preparing the hot strip mill to meet future

market demands

MODERNIZATION STEPS

2001 New sizing press

2003 New roughing stand withattached edger

CVC PLUS and WR bendingfor F2 to F5

2003 New automation system for the roughing and the finishing mill

The new roughing stand is pushedinto the rolling line.

F1 F2 F3 F4 F5 F6 F7 Coiler system

Finishing mill


20

COMMISSIONING

and production start

All the shutdown activities were timeddown to the last minute. On completionof erection and connection of all utilitiesand cables, the roughing stand and theedger went on stream after less than 18 days, and seven hours before thecontractually agreed deadline.

NEW AUTOMATION SYSTEM

Along with the mechanical revamp of thehot strip mill, SMS Siemag replaced theexisting automation system. The newmodular X-Pact system featuring processmodels based on physical relationshipsand extremely quick technological controlsystems is specifically tuned to today’srequirements of the rolling process.

IMPROVED PRODUCT

TOLERANCES

Innovative solutions for optimizing therolling process essentially contribute tothe stable rolling of special materials withextreme dimensions. The thicknessesand width tolerances attained speak forthemselves.

The demanded strip profiles are keptconstant within very close tolerancesfrom the strip head to its tail and fromthe beginning of a rolling schedule to itsend. Specific strategies for the use ofCVC PLUS shifting and work roll bendingsystems enable also longer phases of arolling schedule to be rolled in the samewidth without any undesired profileanomalies in the strip edge area.

Sideguides during shop testing.

Cont’dSalzgitter Flachstahl hot strip mill

50

40

30

20

10

0

Freq

uenc

y (%

)

Thickness deviation classes (μm)

June 2001

Before modernization

Freq

uenc

y (%

)

Thickness deviation classes (μm)

June 2004

After modernization

11,874 strips(8,853.18 km)

50

40

30

20

10

0

-40

to -

30

-20

to -

10

0 to

10

20 t

o 30

40 t

o 50

60 t

o 70

-20

to -

10

0 to

10

20 t

o 30

60

50

40

30

20

10

0

Num

ber

of s

trip

s (%

)

Profile classes (μm)

June 2001

Before modernization

Profile classes (μm)

June 2004

After modernization

10,523 strips

60

50

40

30

20

10

0

Num

ber

of s

trip

s (%

)

-40

to -

20

-20

to 0

0 to

20

20 t

o 40

40 t

o 60

60 t

o 80

-20

to 0

0 to

20

20 t

o 40

40 t

o 60

60 t

o 80

80 t

o 10

0

100

to 1

20

80 t

o 10

0

Operating results: profile precision of the newPCFC model.

Operating results: rolling stability valuated acc. to thickness tolerances.

21

Plant network

Field bus Field bus Field busField bus

ShearRoughing stand(new)

Sizing press(new)

Edger(new)

F1 F2 F3 F4 F5 F6 F7

Finishing stands F1 to F7CVC Plus and WR bending F2 to F5 (new)

Technologicalprocess models

HMI

Technologicalprocess models

ProductionPlanning System

Sequencecontrols

DrivesDrives

HMI

Technologicalcontrols

Sequencecontrols

Technologicalcontrols

new newnew new

new new new new

Structure of the new automationconcept of SMS Siemag.

The modernized finishing millwith CVC PLUS technology.


22

HOT STRIP MILL 1HOT STRIP MILL 1 ThyssenKrupp Steel, Germany

The findings and recognitions obtainedduring the modernization of the SalzgitterFlachstahl hot strip mill with regard to therolling of camber-free transfer bars havebeen incorporated into the modernizationof the hot strip mill 1 of ThyssenKruppSteel in Germany.

Extremely cambered transfer bars fre-quently resulted in unstable rolling ofthese bars in the finishing mill. Togetherwith the integrated SMS Siemag auto -mation system, the installation of newhydraulic sideguides upstream and down-stream of the roughing stand in combina-tion with hydraulic adjusting systems inthe rougher lead to an improvementwhich surpasses even optimistic expec-tations.

MINIMIZING transfer-bar

cambering

Cambers may form due to thicknesswedges in the slab cross-section orasymmetric heating of the slabs. Never-theless, a straight transfer bar is rolledthrough adequate interplay betweensideguides and hydraulic adjusting system.

0 50

500

400

300

200

100

0

-100

-200

-300

-400

-500

5 10 15 20 25 30 35 40 45

Transfer-bar wedge.

Transfer-bar length, m

Wed

ge,

µm

After the first pass. After the final pass.

0 1 2 3

R1

Furnaces

23

30

20

10

0

-10

-20

-30190 200 210 220 230 240 250

t/s

Measurement ahead of the finishing millStandard deviation 1.934 mm

Centerline deviation, mm

Cambering.

The modernized roughing standwith new sideguides.

GOALS

• Minimizing transfer-bar cambering

• Improving rolling stability in the finishing mill

MEASURES

• Hydraulic adjusting system in R1

• New hydraulic sideguide

• Integrated automation concept

RESULTS

“Thanks to the new sideguides in combina-tion with HGC in the roughing mill we stabi-lized the strip travel in the finishing mill andimproved the geometry of the coils.”

(Dr. Helmut Osterburg, Head of Production, BruckhausenHot Strip Mill, ThyssenKrupp)

Roughing stand with newhydraulic adjusting cylinders.

Z3 Shear F0 F1 F2 F3 F4 F5 F6

Finishing mill

In the last 15 years alone, we built morethan 50 new mills and carried out mod-ernizations in more than 50 different hotrolling mills.

Since the end of the 80s, many of theseprojects have been implemented includ-ing electrical and automation systems.Since 1990, we have equipped 44 hotstrip mills (new and modernized mills)with process models and basic automa-tion systems.

We are strategically geared to therequirements of the market and theneeds of our customers, and incorporatecustomer wishes in our decisions.

The longstanding contacts with our cus-tomers are maintained through:

a regular exchange of informationtechnological supportparticipation in national and interna-tional eventscooperation agreements (e.g. for product development)services

Our Service Division works out custom-tailored concepts for the fields ofautomation, maintenance and processtechnology. If required, our hotline isavailable to our customers around theclock. Via the Service Portal previouslyset up at the customer, our hotline staffcan make an initial fault analysis.


24

REFERENCES, 1990 to 2005REFERENCES, 1990 to 2005Modernizations

25

REFERENCES, 1990 to 2005Modernizations

Sizing presses 5

Roughing stands 6

Edgers 7

Coilbox systems 7

Shears 9

Descalers 15

Finishing stands 12

Hydraulic adjusting systems 55

CVC and CVC PLUS systems 64

Work roll bending systems 102

Hydraulic loopers 40

Laminar strip cooling systems 10

Coilers 26

Coiler modernizations 19


26

REFERENCES, 1990 to 2005REFERENCES, 1990 to 2005Modernizations

SIZING PRESSES (5) COILBOX SYSTEMS (7)

ROUGHING STANDS (6) SHEARS (9)

EDGERS (7) DESCALERS (15)

Benefits:

- Higher throughput insteelmaking plant andcontinuous casting facility

- Reduced number ofrequired slab sizes

- Greater flexibility in pro-duction planning

Benefits:

- Higher coil weights- Extension of the product

spectrum (smaller fin-ished-strip thicknessesfor harder materials)

Benefits:

- Improved cropping con-figuration (head and tailcrop cut) forincreased rolling stability

- Extension of the productspectrum (e.g. higher-strength steels)

Benefits:

- Improved strip surface quality

- Lower energy consump-tion for descaling

Benefits:

- Increased production(fewer passes)


Benefits:

- Improved width toler-ances

27

Benefits:

- Higher production- Extension of the product

spectrum (e.g. higher-strength steels)

- Reduction of minimumfinished-strip thicknesses

Benefits:

- Better thickness toler-ances

- Improved rolling stability- Reduced cambering and

wedge in the roughingstand (in combinationwith adequate hydraulicsideguides)

Benefits:

- Improved rolling stability- Better width tolerances

Benefits:

- Improved strip profile, flat-ness and rolling stability

- Extension of the productspectrum

- Cut in rolling costs throughlonger rolling schedules

- Greater flexibility in pro-duction planning

Benefits:


- Improved coiling quality- Meeting of specific

requirements (e.g. coilingof very thin or verythick, high-strength strips)

- Increased production

Benefits:

- Improved coiling tempera-ture tolerances

- Extension of the productspectrum (e.g. dual-phasesteels)

FINISHING STANDS (12) HYDRAULIC LOOPERS (40)

HYDRAULIC ADJUSTING SYSTEMS (55) LAMINAR STRIP COOLING SYSTEMS (10)

CVC AND BENDING SYSTEMS (64/102) COILER SYSTEMS (26/19)

SMS SIEMAG AG

Hot Flat Rolling Mills Division

Wiesenstrasse 3057271 Hilchenbach, Germany

Phone: +49 (0) 2733 29-1616Telefax: +49 (0) 2733 29-2832

E-mail: [email protected]: www.sms-siemag.com

MEETING your EXPECTATIONS

W4/

307

E10

00/1

0/07

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y . P

rinte

d in

Ger

man

y

“The information provided in this brochure contains a general description of the performance characteristics of the products concerned. The actual products may not always have thesecharacteristics as described and, in particular, these may change as a result of further developments of the products. The provision of this information is not intended to have and willnot have legal effect. An obligation to deliver products having particular characteristics shall only exist if expressly agreed in the terms of the contract.”

Documents

HOT STRIP MILLS Modernization concepts