Method of making CG iron

Details Method of making CG iron Method of making CG iron

1984-09-04

1986-06-24

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 35, 148138, C21D 500

Patent

active

045966060

ABSTRACT:
A method is disclosed for making compacted graphite cast iron of improved strength and hardness while retaining excellent thermal conductivity, low shrinkage, and excellent damping characteristics. A ferrous alloy is melted consisting essentially of, by weight, 3-4% C, 2-3% Si, 0.2-0.7% Mn, 0.25-0.4 Mo, 0.5-3.0% Ni, up to 0.002% sulfur, up to 0.02% phosphorus, and impurities or contaminants up to 1.0%, with the remainder being essentially iron. The melt is subjected to a graphite modifying agent to form compacted graphite upon solidification. The solidified casting is heat treated by austempering and quenching to produce an iron having a matrix of bainite and austenite.

REFERENCES:
patent: 3421886 (1969-01-01), Schelleng
patent: 3549431 (1970-12-01), Castelet
patent: 3860457 (1975-01-01), Vourinen et al.
patent: 4227924 (1980-10-01), Subramanian et al.
Metals Handbook, Ninth Edition, vol. 1, 1978, ASM, Metals Park, Ohio, pp. 7-8.

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