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The steel industry presently faces an increasing demand for higher and higher resistance steels, with good forming properties. This demand stems mainly from the automotive industry, which is trying to decrease the weight and fuel consumption of vehicles, with simultaneous safety improvements. Until recently, the production of such steels required a higher concentration of alloying elements. However, these elements are costly and entail difficulties, for example in steelmaking, in continuous casting and in the cold and hot rolling mills. They also bring about problems in coating and welding processes. In the framework of this pilot project, Cockerill Sambre and CRM joined their efforts to develop an industrial solution for the production of high strength and ultra high strength steels, from low-alloyed chemical analyses. Three fast water-based cooling technologies - water nozzles, misting jets and immersed impinging jets (TWICE) - were tested on laboratory, pilot and industrial scale. They were all able to reach cooling rates of 1000 °C/s or higher (for 1 mm-thick steel strips), while ensuring good flatness and outstanding surface properties. Expected metallurgical benefits were demonstrated: fast cooling increased the performances of existing products and even allowed the manufacture of new products. The three technologies can be implemented on continuous annealing lines, either provided with gas jets or HOWAQ, as a primary cooling. The successful industrial tests offered a unique opportunity to investigate a possible extension to the HOWAQ process (developed at CRM since the end of the 1970s), endowed with outstanding features but subject to intrinsic limitations. A TWICE equipment was implemented on the HOWAQ-CAL of Kessales (Jemeppe, Belgium). The first production campaigns confirmed the previous excellent results, regarding cooling performances, robustness of the equipment and product quality. Moreover, the combination of HOWAQ (55 °C/s for 1 mm-thick strips) a

Additional information

Authors: KLINKENBERG P, CRM - Centre de recherches métallurgiques, Angleur (BE);FOUARGE A, Cockerill Sambre, Groupe Arcelor, Seraing (BE)
Bibliographic Reference: EUR 21423 EN (2006), 128 pp. Euro: 25
Availability: Katalogue Number: KI-NA- 21423-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 92-79-01102-2
Record Number: 200618652 / Last updated on: 2006-07-18
Original language: en
Available languages: en
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