Advanced technology for a wide range of applications

Depending on the product mix and the quality requirements, Siemens VAI offers 4-high or 6-high mill stands to meet the customer’s overall requirements. Both mill stand types are equipped with flatness control solutions using SIROLL Siflat or Planicim for measurement and the SIROLL SmartCrown roll contour for the work or intermediate rolls.

Single-stand reversing cold mill

Dunaferr, Dunaijvaros, Hungary

Depending on the product mix, a single-stand cold rolling mill can deliver rolling capacities of between 200,000 and 600,000 t/a. Rolling schedules can be carried out with an even or uneven number of passes to maximize mill availability and performance. In addition to work-roll bending and shifting, Siemens VAI reversing cold mills are equipped with multi-zone cooling to meet the highest demands on flatness.

2-stand reversing cold mills

Siemens VAI reversing cold mills combine the flexibility of single-stand reversing mills with the capacity of conventional coil-to-coil tandem mills at substantially reduced investment costs. Steel rolled in 2-stand reversing cold mills from Siemens VAI is suitable for a wide range of applications, offering the best possible performance in terms of quality and productivity. A 2-stand reversing cold mill can deliver capacities between 300,000 t/a of thin-gauge products and 1,000,000 t/a and more of heavy-gauge products.

Benefits:

High production capacity and yield
Flexible, low-cost rolling of a wide range of products, especially for small order lots
Tight strip thickness and shape tolerances
Minimum off-gauge length
High surface quality

Selected references:

Indian Steel, Ghandidham, India
Dunaferr, Dunaijvaros, Hungary
Borcelik, Gemlik, Turkey
Sollac Mediterranee, St. Chely, France
Angang, Anshan, China
Tangshan Iron & Steel, Tangshan, China
Taiyuan Iron & Steel, Taiyuan, China
EBG, Bochum, Germany
Haironville, Contrisson, France
Nucor Steel, Berkeley, SC, USA
Hadeed, Al Jubail, Saudi Arabia
CSN, Terre Haute, IN/USA

Flatness quality package for cold mills

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The Siemens VAI flatness quality package offers solutions to add, replace or enhance shape control systems in all kinds of cold rolling mills.

Siemens VAI quality improvement packages are suitable both for incremental improvements and major modernization processes. Depending on the mill type the mill stands are equipped with roll bending or shifting systems, SIROLL SmartCrown roll contour or multizone cooling. The backbone of the flatness quality package is the patented SmartCrown roll contour, which can be applied to work and/or intermediate rolls. Benefits include significantly enhanced control range, replacement of all conventional roll contours with a single roll contour, control architecture that meets current and future requirements, more flexible pass schedule due to the large adjustment range of the SmartCrown rolls, and savings in roll inventory.

Strip cleanliness

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SIROLL CM high efficient blow-off system to ensure removal of emulsion.

Remaining liquids on the strip impair surface quality during recoiling. A strip blow off system with a special air-nozzle arrangement can be installed to remove any residual emulsion. The nozzles act on the strip surface in a cascaded manner and directly form the interfaces between work roll and strip, work roll and back up roll, and between the intermediate and backup roll in 6-high stands. The liquid removed bay the air blast is captured in an exhaust system. The cleaning system guarantees efficient blow-off at all mill speeds, ensuring highest strip-surface quality after rolling.

Safety package for cold-rolling mills

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Siemens VAI offers safety concepts for new and modernized rolling mills, as well as safety studies and upgrades.

The Siemens VAI safety package provides maximum risk reduction by conducting in-depth and comprehensive analysis of the safety, functionality, usability and cost factors associated with all plant machinery. Based on the information gained, Siemens compiles a safety plan that specifies each machine’s limits and intended use, identifies potential hazards, estimates the risk associated with each hazard , and eliminates the hazard or reduces the risk through the implementation of protective measures. The safety package offers support for safe working methods and workplaces as well as reducing conversion costs.