Method for continuous casting of a metal with improved mechanical strength and product obtained by said method

摘要

A new method for continuous casting of molten metal is provided that allows one to obtain an intermediate product such as slab, billet wire, etc. before subsequent thermomechanical treatment (e.g. lamination or annealing), such that its chemical composition is modified by the addition of elements in order to give it greater mechanical strength.

主权项

1. Method for a continuous casting of molten metal in the form of a hollow jet in a nozzle positioned between a ladle or a tundish and a continuous casting ingot mould, said nozzle comprising in its upper part a distribution device capable of diverting at least part of the molten metal arriving at the inlet of the nozzle towards an inner wall of the nozzle before it enters the ingot mould, said method comprises the injection into an internal volume of the hollow jet of finely divided solid material comprising nanoparticles of technical ceramic with a characteristic size lower than 200 nm, said nanoparticles being conglomerated prior to their injection into the nozzle into solid pellets of a size between 10 and 1,000 microns, characterised in that said solid pellets comprise the nanoparticles and a metal matrix, wherein said pellets have a sufficient cohesion to avoid their dissociation during the injection, wherein said nanoparticles are oxide nanoparticles selected from the group consisting of Al2O3, TiO2, SiO2, MgO, ZrO2 and Y2O3, and wherein the nanoparticles are incorporated in a quantity between 0.1 and 1% by weight of the casted molten metal.