Method of producing nodular graphite cast iron

Details Method of producing nodular graphite cast iron Method of producing nodular graphite cast iron

1983-10-05

1986-10-28

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148138, 148139, C21D 500

Patent

active

046197133

ABSTRACT:
A method of producing a nodular graphite cast iron having high strength and toughness in shorter time and with reduced production cost. The method comprises the following steps: rapidly cooling the casting, which has been removed from the mold at a predetermined temperature above the A.sub.1 transformation point, at such a cooling rate as not to permit the generation of pearlite structure, after having been held for a predetermined time within the austenite temperature range or immediately after having been removed from the mold; once stopping the rapid cooling at a temperature above the Ms point; slowly cooling the casting within a temperature range above the Ms point for a predetermined time or holding the casting at a constant temperature within a predetermined temperature range above the Ms point for a predetermined time; and cooling the casting slowly down to the normal temperature.

REFERENCES:
patent: 3784416 (1974-01-01), Davies
patent: 3860457 (1975-01-01), Vourinen et al.
patent: 4222793 (1980-09-01), Grindahl
patent: 4382828 (1983-05-01), Henych

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