Centro Sperimentale Metallurgico S.p.a.

Deltasider Spa

Emilio Marino

Aldo Ramacciotti

Raffaele Mastromarino

The improvement consists in forming the nozzles in two parts, the first as a body made of a refractory material, preferably zirconium oxide or magnesite, having a central axial cavity passing right through it, and the second as a body of a calcium-oxide based refractory material, having an appropriate passage for the liquid steel and located in said axial cavity.

Nozzles for casting aluminum-killed steels

A nozzle for the casting of aluminium-killed steel, which is prepared from pellets obtained by mixing 90-99% Ca(OH).sub.2, with at least one compound selected from the metal oxides Fe.sub.2 O.sub.3, Al.sub.2 O.sub.3 and TiO.sub.2 and the chlorides CaCl.sub.2, NaCl and LiCl, in quantities between 1 and 10%, the mixture being pelletized, dried at 100.degree.-150.degree. C. and baked at 800.degree.-1500.degree. C., grounded and screened, the screened material then being further mixed with at least one compound selected from among the metallic oxides Fe.sub.2 O.sub.3, Al.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2, and Cr.sub.2 O.sub.3 and MoO.sub.3 and the chlorides CaCl.sub.2, NaCl and LiCl in quantities between 3 and 20% by weight, as well as with organic binders and carriers such as oil, paraffin, petroleum, lower alcohols and resins in quantities between 1 and 5%. The mix is pressed in molds at 500-1500 kg/cm.sup.2 and baked at 1500.degree.-1800.degree. C., the body thus obtained then being vacuum-impregnated with molten pitch and cooked at about 700.degree. C. in a reducing atmosphere.

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Rome, Italy

Emilio Marino