Process for the production of cast iron containing spherical gra

Details Process for the production of cast iron containing spherical gra Process for the production of cast iron containing spherical gra

1985-07-23

1986-07-22

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 53, 75 58, C21C 702

Patent

active

046017518

ABSTRACT:
A process for the production of cast iron containing spheroidal graphite is disclosed. In the process, the iron melt, which contains sulphur, is treated with metallic magnesium, forming unstable MgS as a by-product. By the addition of CaSi, the sulphur contained in the MgS present in the slag is converted into stable CaS. As a result, the free sulphur which is released upon decomposition of MgS when the melt is allowed to stand for a fairly long time is prevented from going back again into the melt, reacting there with the dissolved magnesium, and forming MgS once again.
Through the stabilization of the sulphur in the form of CaS in the slag itself, resulphurization is effectively prevented. The slag can remain on the melt surface for a longer time than hitherto. The slag provides a heat-insulating effect, so that even longer standing times which are possibly required in certain production processes, can be utilized.

REFERENCES:
patent: 2867555 (1959-01-01), Curry
patent: 3309197 (1967-03-01), Kusaka
patent: 3415307 (1968-12-01), Schuh
patent: 4385030 (1983-05-01), Dremann

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