Metal briquettes for desulphurising steel - by pressing ferrous metal in to compact network-impregnating with rare earth metal

摘要

Briquettes for the desulphurisation of molten steel consists of (1) pieces of ferrous metal pressed in statistical disorder into an intermingled network contg. interstices in the form of a network, and (2) a rare earth metal ocuppying the interstices of the network, the amount of rare earth metal being 15-80 wt %, based on impregnated network. The basic network has a length of 3-230 mm, a width of 0.4-25 m, a thickness of 0.025-2.5 mm, an s.g. of 6.3-1.2 g/cm3 a porosity of 20-85%, and a transverse tensile strength of at least 0.14 kg/cm2. Enables the rare earth metal, which is the active desulphurisation agent, to be introduced into the molten steel bath at a controlled rate, and effects more efficient utilisation of this metal. No undesirable impurities are introduced into the bath. The briquettes are relatively cheap, as serap ferrous metal can be used.