Process for making cast iron

Details Process for making cast iron Process for making cast iron

1983-10-06

1986-04-01

Godici, Nicholas P.

Metal founding

Process

Shaping liquid metal against a forming surface

164 571, 164 581, 75130B, B22D 2700, C22C 3308

Patent

active

045791643

ABSTRACT:
Nodular graphite type or compacted graphite type cast iron are formed by placing a low oxygen potential slag layer over a molten iron bath, adding magnesium in an amount sufficient to reduce the sulfur content in the molten iron to 0.005% maximum and to retain at least 0.01% magnesium in the molten iron. The slag layer is maintained over the molten iron bath until casting so as to prevent oxidation of the magnesium and reversion of the removed sulfur. When nodular graphite iron is being formed, the titanium concentration is maintained below 0.05%, and an inoculant is added to the molten iron bath just prior to casting. By use of a low oxygen potential slag layer to retain the removed sulfur, casting of the molten iron can be delayed for up to 10 hours after addition of magnesium to the bath.

REFERENCES:
patent: 2870004 (1959-01-01), Estes et al.
patent: 2995441 (1961-08-01), Rubel
patent: 3285739 (1966-11-01), Christensen
patent: 3544312 (1970-12-01), Turillon et al.
patent: 4040468 (1977-08-01), Nieman
patent: 4186000 (1980-01-01), Skach, Jr. et al.
patent: 4230490 (1980-10-01), Kessl
patent: 4324587 (1982-04-01), Schusselberger

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