Casting of aluminium-killed steels

Details Casting of aluminium-killed steels Casting of aluminium-killed steels

1983-06-02

1985-10-29

Rolla, Joseph J.

Dispensing

Molten metal dispensing

501123, B22D 4108

Patent

active

045496773

ABSTRACT:
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.

REFERENCES:
patent: 3523804 (1970-08-01), Fukatsu et al.
patent: 3540899 (1970-11-01), Alper et al.

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