Method of manufacturing hot-worked elongated products, in...

Details Method of manufacturing hot-worked elongated products, in... Method of manufacturing hot-worked elongated products, in...

C - Chemistry, Metallurgy

21

D

C21D 8/10 (2006.01) C21D 8/06 (2006.01) C21D 6/00 (2006.01)

Patent

CA 2217309

The invention relates to a process for producing hot-worked elongated products, such as bars or tubes, from high-alloy or hypereutectoid steel in which a feedstock is heated to a deformation temperature and undergoes at least one deformation step. Following the at least one deformation step, the deformed feedstock is either cooled or heated at a specific temperature to achieve a uniform temperature distribution throughout the length and thickness of the deformed feedstock. Next the deformed feedstock is reheated to a temperature below the deformation temperature. The reheated feedstock is continuously rolled in a multi-stand reducing mill to its final size and then cooled by ambient air.

Selon le procédé proposé, une longueur du matériau à cémenter choisi est chauffée à température de formage, puis, après une ou plusieurs opérations de formage, réchauffée à une température de formage inférieure à la première et, par laminage constant à l'aide d'un laminoir réducteur à plusieurs cages, formée à sa dimension définitive et refroidie par exposition à de l'air statique. L'invention est caractérisée en ce que, après les premières opérations de formage et avant le réchauffement, par un système de chauffe et de refroidissement réglé à une température préétablie dans les limites d'une certaine plage de températures, on obtient un produit intermédiaire qui a été exposé, dans sa longueur et son épaisseur, à une température uniformément répartie.

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