Titanium slab for hot rolling produced by electron-beam...

Details Titanium slab for hot rolling produced by electron-beam... Titanium slab for hot rolling produced by electron-beam...

B - Operations, Transporting

22

D

B22D 11/041 (2006.01) B21B 3/00 (2006.01) B22D 11/00 (2006.01) B22D 21/06 (2006.01) B22D 27/02 (2006.01)

Patent

CA 2751697

A titanium slab is appropriate for hot rolling, is produced by electron beam melting furnace, has superior linearity so that it can be fed into a hot rolling machine without performing breaking down process or other subsequent correcting process after production, and has good structure having no cracks at the corner parts. A process for production thereof is also provided. The titanium slab is directly produced by a mold of an electron beam melting furnace, and has the deformation of not more than 5 mm for the thickness direction versus the longitudinal direction and deformation of not more than 2.5 mm for the width direction versus the longitudinal direction, both per a length of 1000 mm of the slab. The process for production of this titanium slab for hot rolling has a step of using an electron beam melting furnace in which its rectangular mold has mold walls of a long side and mold walls of a short side, and a step of pouring molten metal from one of the mold walls of a short side. Furthermore, a mold having chamfered parts at the corner parts can be used in the process.

La présente invention concerne une billette de titane dont les dimensions sont faiblement irrégulières et dont les coins comportent peu de criques, ce qui fait qu'elles se prêtent au laminage à chaud après fusion dans un four à faisceaux d'électrons, sans traitement supplémentaire au moyen de galets profileurs ou ni autre procédure correctrice. L'invention concerne également un procédé de production de la billette. La billette de titane qui est moulée directement à la sortie du four à faisceau d'électrons présente, dans l'axe de l'épaisseur, une déformation inférieure à 5 mm, et dans l'axe de la largeur, de moins de 2,5 mm par 1000 mm de longueur de billette. Le procédé de fusion de la billette de titane pour laminage à chaud implique de couler le métal en fusion dans un moule de forme rectangulaire que l'on place à l'intérieur d'un four à faisceaux d'électrons, à partir d'une porte équipant le petit côté du rectangle. Chaque coin du moule rectangulaire est arrondi.

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