Title

DESIGN AND PERFORMANCE OF TANDEM COLD-ROLLING MILLS WITH 6-HIGH AND 4-HIGH TECHNOLOG

DESIGN AND PERFORMANCE OF TANDEM COLD-ROLLING MILLS WITH 6-HIGH AND 4-HIGH TECHNOLOG

Authorship

Seilinger, A.; Nopp, G.; Finstermann, G.; Djumlija, G.

Seilinger, A.

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Nopp, G.

I am this author

Finstermann, G.

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Djumlija, G.

I am this author

DOI

10.5151/2594-5297-0094

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Abstract

Cold strip producers are permanently seeking for mill equipment, which ensures the most efficient rolling operation and fulfils the demands of the future market in terms of strip quality, dimensional performance and steel grade mix to be produced. In recent years a number of new continuous cold-rolling mills have been installed and this trend is still ongoing. There is an obvious dispute over whether the 6-high technology is required to meet the future quality and product mix targets. Some steel producers trust in the 4-high technology, while others are not even willing to discuss the option of 4-high mill stands and swear by the 6-high mill technology. VAI has carried out extensive modelling work to compare the critical parameters of 4-high and 6-high cold-rolling tandem mills. The comparison includes several mill configurations, for example with two 6-high and three 4-high mill stands or four 6-high mill stands and one 4-high mill stand. The aspects of flatness control based on VAI’s SmartCrown® system, the flatness performance in the strip transition area, the stiffness of the mill stands and its influence on the thickness performance as well as edge-drop control and its necessity for the automotive industry are discussed.

Cold strip producers are permanently seeking for mill equipment, which ensures the most efficient rolling operation and fulfils the demands of the future market in terms of strip quality, dimensional performance and steel grade mix to be produced. In recent years a number of new continuous cold-rolling mills have been installed and this trend is still ongoing. There is an obvious dispute over whether the 6-high technology is required to meet the future quality and product mix targets. Some steel producers trust in the 4-high technology, while others are not even willing to discuss the option of 4-high mill stands and swear by the 6-high mill technology. VAI has carried out extensive modelling work to compare the critical parameters of 4-high and 6-high cold-rolling tandem mills. The comparison includes several mill configurations, for example with two 6-high and three 4-high mill stands or four 6-high mill stands and one 4-high mill stand. The aspects of flatness control based on VAI’s SmartCrown® system, the flatness performance in the strip transition area, the stiffness of the mill stands and its influence on the thickness performance as well as edge-drop control and its necessity for the automotive industry are discussed.

Keywords

Tandem mill; Flatness control

Tandem mill; Flatness control