Method for producing hot-rolled strip and plates

B - Operations – Transporting – 21 – B

Patent

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Details

B21B 1/46 (2006.01) B21B 1/02 (2006.01) B21B 1/34 (2006.01) C21D 8/02 (2006.01) C21D 8/04 (2006.01) C21D 9/00 (2006.01)

Patent

CA 2344423

A method for producing hot-rolled strip and plates in a production plant having a continuous casting installation for slabs 100-180 mm thick, descaling sprays, a single- or multiple-stand rolling unit with or without edging, a cooling interval, a heating furnace, and a Steckel mill. Between the continuous casting installation and the heating furnace, only the skin layer of the previously descaled slab is deformed in-line, recrystallized during and after deformation, and then cooled in several stages to a temperature below the Ar3 transformation point and temporarily maintained there until the microstructural transformation of the recrystallized, fine-grained austenite to ferrite/pearlite has been completed.

L'invention concerne un procédé de production de feuillard à chaud et de tôles dans une installation de production comprenant une installation de coulée continue pour des brames d'une épaisseur comprise entre 100 et 180 mm, des jets de décalaminage, une unité de laminage à une ou plusieurs cages, avec ou sans refouleur intégré, un parcours de refroidissement, un four de réchauffage et un laminoir Steckel. Selon le procédé de l'invention, seule la couche marginale de la brame décalaminée au préalable, proche de la surface, subit un formage en ligne entre l'installation de coulée continue et le four de réchauffage. Cette couche est recristallisée pendant et après le formage, puis refroidie en plusieurs étapes à une température inférieure au point critique Ar3 et maintenue de façon temporaire à cette température, jusqu'à ce que la transformation de structure de l'austénite à grains fins recristallisée, dans la ferrite/perlite, soit terminée.

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