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Title

NEW HOT ROLLING TECHNOLOGIES FOR THE PRODUCTION OF THIN HOT BAND

Authorship

Hackl, Manfred; Seilinger, Alois; Bragin, Sergey; Krimpelstätter, Konrad; Maierl, Josef

Hackl, Manfred

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Seilinger, Alois

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Bragin, Sergey

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Krimpelstätter, Konrad

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Maierl, Josef

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DOI

10.5151/9785-9785-32194

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Abstract

The demand for hot rolled strip is growing in multiple ways. To remain competitive, new and existing mills must meet arisen challenges in the best possible way. The production of hot strip is a key element of steel production. Since close to half of all steel produced is hot-rolled to strip, mills require maximum throughput and availability combined with geometrical precision and the ability to create optimum material properties. Today there is a clear trend in developing new steel grades with high-strength and improved formability, like 3rd generation AHSS (Advanced High Strength Steels), as well as a trend to produce thinner and wider gauges. This trend challenges hot strip mills because it requires new technologies which provide more flexibility in metallurgical treatment during the rolling process. In order to meet and promote these trends Primetals Technologies is currently working on different concepts and solutions. One example is the development of a new mill stand technology FLEX-HI HOT which allows to adapt the last finishing mill stands by efficiently switching from 4-high to a 6-high mode with small work roll diameter based on production needs. Another solution is to apply a permanent 6-high rolling stand at the end of the finishing train. A smaller work roll diameter allows to achieve higher specific thickness reductions and deformation rates resulting in significant thinner hot-strip gauges with valuable metallurgical benefits. The developed solution concepts with technological and metallurgical benefits will be presented in this paper.

Keywords

Hot rolling, Hot strip mill, Flex-HI HOT, 6-high, small work roll diameter, AHSS