Cold rolling mills for stainless steel Modernization concepts for a bright future

Transcription

1 Cold rolling mills for stainless steel Modernization concepts for a bright future

2 Cold Rolling MillS for StainleSS Steel Stainless steel: Brilliant future prospects Stainless steel is a high-quality material for a large variety of applications. Stainless steel is used everywhere where resistance to corrosion, aesthetic appearance and long service life are in demand. The following are areas of application for stainless steel: Architecture and facade cladding Chemicals and petrochemicals Medical technology and food industry Household goods Vehicle construction Offshore engineering and shipbuilding There are currently more than 120 standardized grades of stainless steel which differ in accordance with manufacture and composition. A higher chrome content serves to increase chemical resistance, while additions of nickel, molybdenum and aluminum enhance the formability and the resistance to acid and heat. One of the many advantages of stainless steel is that it can also be completely recycled. For the construction of high-rise buildings, use is made increasingly of stainless steel. A good example is the group headquarters of the financial services company, Goldman Sachs in Manhattan, right in the middle of New York. The stainless steel cladding for the 228 m high building, designed by the US star architects Pei Cobb Freed & Partners, was supplied by former ThyssenKrupp Nirosta, Krefeld. X-Roll and X-Pro designate the family of brands from our Hot Rolling Mills and Cold Rolling Mills Divisions. They symbolize plants and technical equipment for the economical and flexible production of hot and cold strip. Examples of application from the world of stainless steel. 2

3 The group headquarters of the financial services company, Goldman Sachs in Manhattan, right in the middle of New York. (Source: ThyssenKrupp). Stainless steel: Brilliant future prospects 2 analysis and studies the path towards the optimum solution 4 Modernization solutions that pay off 6 top-quality components from our high-tech workshop 14 effective and reliable implementation 16 examples of modernization 18 outokumpu nyby 20 outokumpu nirosta Krefeld 22 aperam Stainless europe 24 acciai Speciali terni ast 26 3

4 Cold Rolling MillS for StainleSS Steel analysis and studies the path towards the optimum solution Modernization enables older rolling mills to be brought up to the latest state-of-the-art. Several aims are usually pursued when revamping a mill, such as the increase of production and improvement of quality. Further objectives are the saving of operating costs and the enhancement of plant safety. Modernization projects for stainless-steel cold rolling mills require a special concept that is adapted to the respective mill and to the pertaining wishes of the customer. For this reason we develop modernization projects in close cooperation with our customers. When establishing the need for modernization, owners take different approaches. Some owners use their own analyses to define which components of a mill are to be replaced, added or improved. Other owners specify their aims, such as increased production, improved observance of tolerances or the processing of certain special steel grades. SMS group offers plant owners the service of analyzing the process requirements and potential of the existing mill within the framework of a study. The results of the study and of the consultations with the customer constitute an optimized modernization concept. SMS group is renowned for its ability to master all phases of a project in depth, from the definition, planning and development, design, coordination of the purchasing and procurement, to the fabrication, erection and commissioning of the mill. Customer Definition of aims Analysis of aims (if necessary, study) Joint optimization of aims and possibilities Elaboration of initial proposals Proposal for concept Coordinated concept as a basis for the design and layout Quotation on the basis of the agreed concept/contract The optimum modernization concept is the result of close cooperation with our customers. 4

5 Communication and cooperation are the keys to success. 5

6 Cold Rolling MillS for StainleSS Steel Modernization solutions that pay off 20-roll cold mills have been part of our range of products since the fifties. Many aspects of the technology have been improved and optimized since the beginnings of these types of rolling mills in order to better satisfy the constantly increasing demands of the stainless steel manufacturers. The most recent developments in the fields of mechanics, hydraulics, electrics and automation enhance the productivity and improve the product quality. The most recent developments in 20-roll cold rolling mills Hydraulic roll-gap adjustment system for achieving extremely close strip thickness tolerances Hydraulic roll-crown adjustment system for improved flatness and optimum adaptation of the roll gap to the profile of the rolled stock Hydraulic axial shifting of the inner intermediate rolls for perfect strip edges Improved rolling-oil squeezer systems for drier strip surfaces and reduced consumption of rolling oil Roll-changing systems for faster and safer roll-changing and higher productivity Self-cleaning rolling-oil filter systems for greater environment-friendliness and higher cost savings Modern hydraulic systems with a compact pump system and control elements in modular construction for easier and more cost-favorable maintenance Dynamic process control systems and mill management systems for perfect strip quality through optimum mill stand presetting It is possible to retrofit many of the developments which today are automatically contained in new plants. A modernization offers many possibilities, from the installation of individual systems (e.g. new rolling oil wipers) to comprehensive revamp packages. Potential areas for modernization The essential areas of potential optimization for a 20-roll cold mill are to be found in the entry and exit equipment the mill stand area the hydraulic system the rolling-oil filter and cooling system the roll gap lubrication the automation system 6

7 Entry and exit equipment for higher productivity Coilers: The coilers are designed as high-tension reversing reels on both sides. The installation of an additional payoff group with a pinch and leveller roll unit shortens the non-productive times during coil changing and enhances the productivity, above all for entering strips with gauges of 6 to 8 mm. Automatic coiler mandrel lubrication for reduction of the maintenance expenditure Flatness measuring rollers, including control system Efficient oil-wiper systems Mobile pinch rolls for problem-free threading of the strip Advantages of our high-performance oil wipers The twin-roll unit in cassette-type design makes it possible to use several roll types (nonwoven, steel, bronze, Pollastrelli) as desired, depending on the application Recently developed Nipco * oil wiper system for uniform wiping effect over the strip width and reduced quantity of residual oil on the strip surface Quick-change system in cassette-type design Integrated primary wiper and strip-edge blow-off device Reliability also at high strip speeds, from 600 to 800 m/min High-tech mill stand components for top quality Servo-hydraulic roll-gap control (AGC) Roll-crown adjustment system: Roll-crown adjustment is performed by servo-controlled adjustment cylinders. Additional roll-crown adjustment, e.g. for the bearing shafts F/G. IMR shifting: Inner intermediate roll shifting by means of push/pull system. During roll-changing, the inner intermediate rolls no longer need to be manually uncoupled. Moreover, the maintenance becomes easier. Bearing shaft clamping: The attachment of the bearing shafts in the compact block-type mill is performed by a hydraulic saddle clamping system, which means that there is no loner any need for manual detachment by the maintenance personnel. Drive with safety coupling: The hydraulic safety coupling immediately separates the motor from the drive train should an overload occur. This prevents damage to the drive elements in the event of a fault. Roll-changing: Equipment items for quick rollchanging are indispensable plant features for enabling efficient productive operation. Advantages of our modern mill stand components Higher dynamics of the actuators Improved positioning accuracy and thus better reproducibility of the product quality Higher adjustment speed Less wear Extremely close strip thickness tolerances and the smallest possible off-gauge lengths Extremely close strip flatness tolerances Simplified roll-changing Simplified operating sequences Nipco * oil wiper system: Yoke with support elements and roll sleeve in two variants. * Nipco is a registered trademark of Voith Patent GmbH 7

8 Cold Rolling MillS for StainleSS Steel Everything flowing nicely: Hydraulic system Adaptation to the modernized adjustment systems: The hydraulic supply to the rolling facilities is provided by a combined low-pressure and highpressure hydraulic system. In the pump station, the recirculation of the hydraulic oil takes place (cooling, heating, filtering). The high-pressure pumps generate the required flow volume and pressure of the fluid. Consumption peaks in the process sequence are absorbed by hydraulic accumulators. The control systems ensure a regulated flow of the fluid in accordance with the requirements of the hydraulic consumers. Finest-quality filter systems Regenerative Supafine filter system with Supafine filter elements for micro-filtration of the rolling oil used A large number of cold rolling mills for stainless steel are still equipped with old precoated cartridge filters which cause great problems as regards waste disposal. Furthermore, the owners experience problems with heightened wear on the work rolls and poorer surface quality due to break-out of diatomaceous earth. Advantages of our hydraulic systems Leakages and installation times are minimized by pre-assembly and tests. Hydraulic systems from SMS are modular in structure and therefore are particularly operator-friendly and easy to maintain. Mill stand with utility module. Supafine filter. 8

9 Advantages of our filter systems Extremely high cleaning efficiency Low operating costs due to: - Low maintenance expenditure - No filtering agents required - Low rolling oil losses - Few waste materials Environment-friendliness due to the small number of waste materials requiring disposal Long service life of filter elements No risk of break-out of filtering agent on the clean oil side High operational reliability due to fully automated system Supafine Supafine filters are used for the micro-filtering of mineral oils of low viscosity which are used in the cold rolling of stainless steels. Owing to its special design, the Supafine filter does not require any filtering agents which always require disposal. The filtration is performed by micro-fiber filter elements. Our Supafine filter elements represent the currently most up-to-date solution for fine filtration. They can operate without filtering agents, e.g. diatomaceous earth. Waste products that cannot be recycled are thus avoided. In view of the need for environmental protection and the lowering of operating costs, it makes sense to retrofit a Supafine filter system as part of a revamp. 9

10 Cold Rolling MillS for StainleSS Steel New clogging sensor for rolling oil In cooperation with HYDAC International, SMS group has developed a new online measuring system for determining the degree of contamination of rolling oils. The Rolling Oil Contamination Sensor (ROCS) makes it possible to ascertain the quantity and size of particles in the rolling oil. The system can be integrated into existing plants. Advantages Our ROCS makes it possible for the first time to continuously monitor the filtrate quality. Alternative filtering agents can be examined for their efficiency. This enables the filter operation to be optimized and operating costs to be reduced. The measuring principle is based on the so-called transmitted-light process. In this process, particles flow through a capillary tube that is penetrated by a light beam. When the light beam hits particles it becomes weaker upon impact on the receiver. The size and quantity of the particles are determined on the basis of this loss of strength and of the period of time during which the shadow is thrown. The concentration of the particles is also measured. In order to ensure that only individual particles are detected, the particle load must not be too high. The test specimen is diluted for this reason. The dilution is also performed in a fully automated manner in the device. AUTOMATIK ISO-Klassen ABREINIGEN 10

11 Tailor-made tribology Selection and provision of the tailor-made rolling oil Process-optimized lubricant development Cooling lubricants are gaining in importance in the cold rolling process, due above all to the continually increasing demands made on the value-added in the rolling process. This relates in particular to the following factors: Availability Pass reduction Rolling speed Surface quality Steep run-up curve SMS group is the only full-liner for rolling mill technology that is present on the market with an uninterrupted range of rolling oils and emulsions. The essential key data for the tailor-made lubricant are determined by the tribological T-Roll model approaches already at the plant design stage. The essential parameters are: Viscosity Lubrication effect Friction coefficients Lubricant film thickness On the basis of the above data, samples of selected coolant lubricants are then examined for their suitability in a comprehensive testing program and optimized for practical utilization. Advantages Customers benefit from our know-how which embraces the entire process chain Partnership with an experienced manufacturer of cooling lubricants Customers have only one contact partner for the complete process chain SMS already has a large number of references with tailor-made high-performance cold-rolling oils for rolling of stainless steel in 20-roll mills. Thanks to improvements in the rolling process and in the surface quality, it was possible to convince those customers who already had production facilities to change over to rolling oils from SMS. Particularly for the highly demanding rolling of 2R material (bright-annealed), a decisive degree of success was achieved with regard to freedom from stains and improvement of reflectivity. Rolling process Process requirements T-roll model Forecast of process data, lubricant parameters Preselection Lubricant Optimized lubricant Ready for use Test field Strip drawing test Optimization Lubricant formula 11

12 Cold Rolling MillS for StainleSS Steel Automation Progressive stainless steel production also denotes fully up-to-date automation and supportive service from a single source. We have grouped our services in the electrical and automation field under the name of X-Pact. X-Pact comprises: Production planning Setup systems Control systems for the actuators Gauge, flatness and elongation control Drive controls HMI systems Drives, measuring devices, sensors Perfected automation systems As system suppliers we assume the responsibility for all functions over the entire service life of the plants built by us. Our services include: Site erection, commissioning Maintenance management Inspections, repairs, spare parts Counseling, optimization 24-hour hotline and teleservice Updates and upgrades for software and hardware Sophisticated X-Pact automation systems. 12

13 Advantages of our systems We offer our customers perfected automation systems for maximum plant efficiency and product quality. These systems are developed from interdisciplinary cooperation between the areas of mechanical engineering, utilities, technology, and electrical and automation systems, as well as through cooperation with leading worldwide manufacturers. Our product range comprises integrated systems for drives, control systems, process models and production planning (Levels 0 to 3). Production in % Example of a plant run-up, reference: VDM, Werdohl Start of production Current Scheduled Days since the start of the hot tests Plug & Work: Switch on and off you go. That is the ideal case. For this, we test our systems in a really thorough manner before commissioning: Comprehensive simulations of functions are the first step. Following this, the complete automation technol- ogy is linked to a simulation model which displays the plant with its process stages. In this way, sequences and technical functions are carefully tested and optimized already before delivery. This ensures that a steep run-up curve is available, above all for revamps. Level 3 Production planning and control Host computer (PPS) Level 2 Pass schedule model (PSC) Profile and flatness model (PFC) Edge drop control model (EDC) Level 1 Basic automation system Operator stations Sequence and drive controls Measured value processing Signal and data exchange Level 0 Complete systems for plant equipment Instrumentation and control technology Drive engineering Power supply Ancillary facilities LEVEL 3 LEVEL 2 LEVEL 1 LEVEL 0 13

14 Cold Rolling MillS for StainleSS Steel top-quality components from our high-tech workshop Our workshop in Hilchenbach (Germany) is a specialist high-tech production center for core components of our supply range. Our production shop is equipped with fully up-to-date machines in accordance with the latest knowledge relating to unit and job-lot production and guarantees high-quality, cost-efficient manufacture. All of the key components manufactured by us that are essential for quality are pre-assembled in our workshop, inclusive of piping and cabling, and are subjected to comprehensive function testing. This facilitates rapid and problem-free final assembly at the customer. Erection and installation times are thereby reduced to an absolute minimum, thus allowing fast and reliable commencement of production as a result of shorter commissioning. Modular structure of our mill stands Our modular hydraulic systems for mill stand adjustment (All-in-One design) have many advantages. They ensure high plant availability and low operating costs. Advantages The expenditure on stand piping becomes greatly reduced. The assemblies are arranged in a neat and compact layout, allowing easy maintenance, and are optimally accessible for servicing and repair work. The platform modules are equipped with integrated valve units with piping. The hydraulic roll-gap adjustment cylinders are operated and controlled via a hydraulic servo-control. They are not susceptible to faults. If desired, tanks and piping can be executed in stainless steel. The pump stations in modular design for high and low pressure comprise constant-pressure variable pumps and have a space-saving and compact layout. Our valve units are designed in column construction and can easily be extended to include additional functions. Comprehensive pre-assembly work and function tests allow trouble-free installation and commissioning and guarantee a fast plant run-up. Pre-assembled housing window. Machining of a mill housing in Mono-Block design as part of a revamp. 14

15 Pre-assembly. Pre-assembly of mill stand service platform. Hydraulic function test. Hydraulic station. Partially pre-assembled 20-roll mill stand. 15

16 Cold Rolling MillS for StainleSS Steel Modernization measures: effective and reliable implementation The implementation of modernization projects requires a maximum degree of experience as well as close cooperation with our customers. Consistent project management is necessary in order to safeguard the quality of the individual components and to ensure that agreements are honored. The actual condition of the plant has to be recorded precisely, and creativity needs to be exercised when adapting the designs of the new and/or modified equipment items to the existing foundations and to other local conditions and requirements. This is an essential precondition for ensuring that downtimes for the installation of new equipment or the revamping of existing items can be kept as short as possible. Short plant shutdowns Preparatory work during regular maintenance shutdowns and the installation of new or revamping of existing equipment during longer downtimes (e.g. summer shutdown) are carried out according to detailed time schedules. Project definition Definition of objectives Analysis of process requirements and plant potential (study) Modernization concept Quotation Contract 16

17 Success depends on close cooperation and partnership with our customers during all phases. Engineering Production Installation Commissioning Engineering from a single source In-house manufacture of core components Plug & Work: Simulation of the complete automation Detailed planning Preparations during regular shutdowns Nothing is left to chance A well-established and coordinated commissioning team Tailor-made cooling lubricants Optimum plant settings Familiarized operating personnel Efficient, tailor-made solution Short plant shutdowns Fast plant run-up 17

18 Cold Rolling MillS for StainleSS Steel examples of modernization 18

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20 Cold Rolling MillS for StainleSS Steel outokumpu nyby, torshälla, Sweden Dismantling and recommis sioning in record time The plant 20-roll cold mill in Mono-Block design Stand size MB The task The aim of the modernization of the 20-roll cold mill was to attain an improvement in thickness tolerances and strip flatness. The rolling mill originally supplied by us in 1956 rolls stainless hot and cold strip of the AISI 300 and AISI 400 series with strip widths from 700 to 1,400 mm a minimum final gauge of 0.2 mm. Our solution A modernization concept was elaborated jointly with the customer which envisaged the entire revamp in several phases. It included the dismantling of the mill stand, the transport from Sweden to our workshop in Hilchenbach, the mechanical overhaul of the mill stand including shop assembly, the transport back to Sweden as well as the installation and recommissioning together with the entry and exit sections revamped on site at the customer's. An essential precondition for attaining this ambitious goal was the just-in-time machining in our Hilchenbach workshop. The result The mill stand was dismantled in merely two weeks and mechanically overhauled in our workshop. The bearing shaft bores (wobblers) in particular were remachined. Consequently, parallelism of the work rolls and therefore improved strip flatness could be attained. The mill stand was equipped with modern actuators for the roll and rollcrown adjustment and then installed and put into operation. With the new hydraulic roll-crown adjustment on the B/C axis, a zone-controlled flatness control is possible. The renewed saddle clamping for bearing shafts reduces the set-up time. Thanks to our systematic planning of the revamp, we have succeeded in limiting the shutdown times to a minimum. While the mill stand was being modernized in our workshop, the entry and exit sections were revamped in parallel at the customer's works in such a way that coils with larger diameters can be processed Thanks to this revamp, it is possible to increase the maximum coil diameter to 1,900 mm and the maximum coil weight to 25 t. The additional installation of coil transfer cars enabled the non-productive times during coil change to be reduced. Furthermore, a new hydraulic station in our All-in-One design was installed. Due to the restricted space available, it was erected at an elevated level on a steel structure. We likewise installed axial shifting of the inner intermediate rolls, by means of which the strip edge is optimally influenced under rolling force. The new hydraulic adjustment system with automatic coupling of the rolls (push/ pull axial shifting) meets all requirements for highly dynamic influencing of strip flatness. Push/pull axial shifting The inner intermediate rolls are shifted by hydraulic cylinders which are only arranged on the drive side of rolls and are connected to the roll neck via a coupling. In our modern, sequence-controlled systems, no manual intervention by the operators is required. Stages of revamping at Outokumpu Nyby Order placement: January 2003 Dismantling at Nyby: 3 days Mill stand machining in our workshop: 14 days Installation at Nyby: 6 days Commissioning: 4 days Plant shutdown: 1 month 20

21 The cold rolling mill after revamping. Planning: 3D illustration of the overhaul of the mill stand. Remachining of the bearing shaft bores (wobblers) in our workshop. Housing window after the revamp. 21

22 Cold Rolling MillS for StainleSS Steel outokumpu nirosta gmbh Krefeld, germany Successful modernization of the 20-roll cold mill SG3 The plant 20-roll cold mill of type mono-block (MB 21BB-61 ) The task At the Krefeld location, the mono-block 20-roll cold mill SG3 which had been supplied by SMS more than 45 years ago is used to produce high-quality stainless steel strips. To be able to roll also ferritic materials of thin strip dimensions and high-gloss quality (2R brightannealed), Outokumpu Nirosta commissioned SMS group in September 2014 to modernize all equipment required for that purpose. In 2015, Outokumu Nirosta awarded a follow-up order to SMS group comprising the modernization of the existing rolling oil system to make the rolling mill fit for producing such high-gloss grades. Our solution When revamping the rolling oil system, part of the existing equipment remained and was re-used. The most important equipment newly installed comprised the dirt oil tank with automatic pre-separator and the extremely fine filter system Supafine from SMS which is able to achieve a very high degree of filter fineness without using costly filter aids. The result To comply with Outokumpu Nirosta s request, SMS group modified the mechanical mill stand equipment and the rolling oil system within a very tight time schedule to ensure Outokumpu Nirosta could start producing the desired material grades on this mill as early as possible. On November 23, 2015 our customer managed to start rolling again. After the modernization, our customer has a 20-roll cold mill which is much more flexible to use and the customer can now roll ferritic, high-gloss strip grades, too. The newly installed equipment permits the entire thickness range to be rolled at maximum rolling speed. Thus, strip threading and unthreading has become much easier and quicker, which, in turn, makes the facility operate at higher productivity and, not least with a view to the modified rolling oil system, more cost-efficiently. Scope of new equipment amongst others: Dual-cassette wiper system Cooling medium volume control Axial shifting system for the inner intermediate rolls Mill stand door Exhaust hoods Entry-side, adjustable and swingable pinch roll Exit-side bending and pinch roll Transfer tables New Supafine rolling oil system Modernized rolling oil system (3D illustration). 22

23 Cold rolling mill SG3 after modernization. Sludge tanks of rolling oil system. Systempumps of rolling oil system. New hydraulic valve stand. 23

24 Cold Rolling MillS for StainleSS Steel aperam Stainless europe genk, Belgium Ready to take on a new assignment The plant Single-stand reversing cold mill of CVC 4 design. The task In 1988 we supplied a CVC 4-HS reversing cold mill to ArcelorMital Dudelange in Luxembourg (formerly Arbed) for the manufacture of low-carbon steel strip. In December 2006, when relocating this cold rolling mill stand to the production location in Genk, Aperam Stainless Genk placed an order with us for an extensive revamp of the reversing mill and for preparing it for its new area of application, namely the rolling of stainless steels. With the mill in Genk, the customer wanted to reduce his production costs. Furthermore, he was thus able to prepare the future expansion of his production capacity for stainless steel strip. Our solution Within the scope of the revamp, CVC shifting devices of the latest generation were installed. The entry and exit sides were equipped with wrapper rolls, pinch rolls, leveling and bending rolls and an oil wiper unit. Furthermore, new reversing reels were installed, as well as two coil transfer cars and two coil receiving devices for each reel. The installation of an automatic coupling for the oilair lubrication and of a paper winder completed the revamp. The supply systems (hydraulics, rolling emulsion etc.) and the safety technology were also adapted to meet the new requirements. The result The entire equipment was able to be delivered and installed within twelve months. This short revamping period was possible thanks to the excellent team work with the customer. For the customer, the use of a reversing cold mill is highly advantageous from an economic point of view because the mill stand, a large portion of the mechanical components and the auxiliary plant and facilities can be utilized again. The customer has thus received a powerful stainlesssteel rolling mill of four-high design which has an annual capacity of 200,000 t. The rollable strip width is 800 to 1,600 mm. Strips with an entry gauge of maximum 5.0 mm can be processed. The minimum attainable final gauge is 0.6 mm. The fully automatic work-roll changing device was custom-designed and completely revamped. The roll changing car works with two cassettes which are able to accommodate a total of four roll pairs. Compared with the traditional design, the number of rolls on the car was thus doubled. Main pulpit. 24

25 Cold rolling mill at the new location in Genk. Automatic work-roll changing system. Finish-rolled stainless steel strip. 25

26 Cold Rolling MillS for StainleSS Steel acciai Speciali terni ast terni, italy Brilliant results at the new location The plant Skin-pass mill of two-high design and two 20-roll cold mills of Mono-Block design. The task To concentrate the capacities for the production of cold-rolled stainless-steel strip at one location, Acciai Speciali Terni SpA (AST), Italy, relocated production facilities from Turin to Terni in the middle of Within the scope of this project, AST gave us an order for the implementation and modernization of two 20-roll cold rolling mills and a two-high skin-pass mill for stainless steel. AST used this opportunity to have the equipment and systems modernized by us. Despite them being in operation for decades, the rolling mills supplied by SMS group required only minimal alterations. In this process, the two 20-roll cold mills were equipped with new oil wipers. Our solution Our scope of supply included the dismantling of the three cold rolling mills at AST s Turin location, the transport to Terni and the installation and commissioning of mechanical equipment and auxiliary facilities such as cooling, hydraulic and filter systems. An important part of the modernization was the installation of new fire extinguishing systems. The result 20-roll cold mill No. 8 was the first of the three mills to be successfully put into operation in May 2008, only a few months after it had been dismantled in Turin. This was soon followed by the commissioning of the second cold rolling mill stand No. 9 in November And finally, in February 2009, the skin-pass mill was put into operation again after a brief revamping phase. This mill is used for the skin-pass rolling of ferritic and austenitic stainless steel strip of grades AISI 400 and 300. The strip gauges range from 0.3 to 5.0 mm and the strip widths from 800 to 1,540 mm. The maximum coil weight is 25 t. Skin-pass mill of two-high design. Coil loading at the skin-pass mill. 26

27 Skin-pass mill at the new location in Terni. View of the 20-roll cold mill MB21BB-62 (CRM No. 9). 20-roll cold mill MB22B-54 (CRM No. 8). 27

28 SMS group GmbH Cold Rolling Mills Division Wiesenstrasse Hilchenbach, Germany Phone: Telefax: W6-307E SMS group GmbH Published on Circulation 1000 Printed in Germany Ky 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 these characteristics 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 will not have legal effect. An obligation to deliver products having particular characteristics shall only exist if expressly agreed in the terms of the contract.