Method for making pitting resistant cast iron product

Details Method for making pitting resistant cast iron product Method for making pitting resistant cast iron product

1983-08-25

1984-11-13

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148141, 148 35, 148 39, 75128C, 75128D, 75128W, C21D 500

Patent

active

044823967

ABSTRACT:
A method for making a cast iron product having a high resistance to both wear and pitting. The method comprises casting a cast iron containing C, Si, Mn, Cu, Ni, Cr and Mo with or without P and S to provide a casting having a local chilled structure having a cementite content of 30 to 50%. The casting is then annealed at a reduced temperature and subsequently subjected to a quenching treatment. The quenching treatment is carried out by heating the casting under a particular condition including heating temperature and time and then quenching it. The product is finally tempered.

REFERENCES:
patent: 2962397 (1960-11-01), Thompson
patent: 4032334 (1977-06-01), Burk et al.
patent: 4124413 (1978-11-01), Komatsu et al.
Marbaker E., "Heat Treatment of Gray Cast Iron", Iron Age, Aug. 2, 1928.

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