Thin high-strength article of spheroidal graphite cast iron and

Details Thin high-strength article of spheroidal graphite cast iron and Thin high-strength article of spheroidal graphite cast iron and

1989-09-07

1991-02-05

Yee, Deborah

Metal treatment

Compositions

Heat treating

148321, 148139, C22C 3704, C21D 500

Patent

active

049901940

ABSTRACT:
A thin high-strength article of spheroidal graphite cast iron having graphite particles dispersed in a ferrite matrix containing 10% or less of pearlite, characterized in that there are substantially no fine gaps between the graphite particles and the ferrite matrix. It is produced by pouring a melt having a spheroidal graphite cast iron composition into a casting mold; removing the casting mold by shake-out, while substantially the entire portion of the resulting cast iron product is still at a temperature of its A.sub.3 transformation point or higher; immediately introducing the cast iron product into a uniform temperature zone of a continuous furnace kept at a temperature of the A.sub.3 transformation point or higher, where the cast iron product is held for 30 minutes or less to decompose cementite contained in the matrix; and transferring the cast iron product into a cooling zone of the continuous furnace to cool the cast iron product at such a cooling speed as to achieve the ferritization of the matrix.

REFERENCES:
patent: 4475956 (1984-10-01), Kovacs et al.
patent: 4572751 (1986-02-01), Oguri et al.

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