Cast iron especially suited for ingot molds

Details Cast iron especially suited for ingot molds Cast iron especially suited for ingot molds

1978-10-18

1980-12-02

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

75123CB, C22C 3704

Patent

active

042369444

ABSTRACT:
This is provided an ingot mold formed of a cast iron consisting essentially of 3.7 to 4.0% C, not more than 1.6% Si, 0.40 to 0.80% Mn, 0.10 to 0.45% P, not more than 0.10% S, 0.020 to 0.050% Mg, the balance Fe with normally appearing impurities. The elements are adjusted to provide a specific carbon equivalent in the range of 3.2 to 3.6% calculated as C.sub.eqv =%C+0.65% Si+0.35% P-35% Mg. In addition, the ingot mold structure of the present invention contains an amount of not more than 5% by volume of carbide, an amount of not more than 25% by volume of ferrite and at least two-thirds of the total graphite volume being spheroidal graphite with the balance pearlite.

REFERENCES:
patent: 2516524 (1950-07-01), Millis
patent: 2542655 (1951-02-01), Gagnebin et al.
patent: 3109733 (1963-11-01), Tisdale et al.
patent: 3726670 (1973-04-01), Kusaka
patent: 4096002 (1978-06-01), Ikawa et al.
patent: 4099994 (1978-07-01), Ikawa et al.

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