Method of producing spheroidal graphite cast iron article

Details Method of producing spheroidal graphite cast iron article Method of producing spheroidal graphite cast iron article

1992-04-02

1993-02-16

Seidel, Richard K.

Metal founding

Process

Shaping liquid metal against a forming surface

164 551, B22D 2700

Patent

active

051862336

ABSTRACT:
A spheroidal graphite cast iron article having a thin portion and a thick portion, the number of spheroidal graphite particles having a diameter of 2 .mu.m or more being 600 /mm.sup.2 or more and less than 2000 /mm.sup.2 in the thin portion and 130 /mm.sup.2 or more and less than 600 /mm.sup.2 in the thick portion, and spheroidization percentage being 70% or more in the thick portion, is produced by a method comprising the steps of: (a) preparing an iron-base alloy melt having a composition consisting essentially by weight of 3.0-4.0% of C, 0.8-1.7% of Si, 1.0% or less of Mn, 0.2% or less of P, 0.01-0.2% of S, the balance being substantially Fe and inevitable impurities; (b) desulfurizing the iron-base alloy melt to control the sulfur content of the melt to less that 0.01% by weight; (c) adding a sulfur-containing material to the melt in such an amount that the sulfur content of the melt becomes 0.011-0.03% by weight; and (d) adding an Mg-containing material and a lanthanide element to the melt to conduct a spheroidizing treatment.

REFERENCES:
patent: 3905809 (1975-09-01), Malizio et al.
patent: 4004630 (1977-01-01), Dunks
patent: 4245691 (1981-01-01), Mohla
patent: 4414027 (1983-11-01), Gorgerino et al.
patent: 4450019 (1984-05-01), Satou et al.
patent: 4779663 (1988-10-01), Pruyne et al.

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