High duty ductile case iron and its heat treatment method

Details High duty ductile case iron and its heat treatment method High duty ductile case iron and its heat treatment method

1977-07-11

1978-07-11

Andrews, M. J.

Metal treatment

Compositions

Heat treating

148139, C21D 500

Patent

active

040999947

ABSTRACT:
A ductile cast iron having a high tensile strength as well as a high elongation due to its matrix structure of finely mixed ferrite and pearlite grains obtained by the heat treatment. The material is pearlitic ductile cast iron and may be of ordinary ductile cast iron composition with the only exception that the manganese content being substantially less than 1%.
A method of heat treatment for obtaining such a ductile cast iron, which is composed substantially of heating the material rapidly to form ferrite, austenite and graphite co-existing structure, and air cooling the same to change that structure into the above mentioned matrix structure.

REFERENCES:
patent: 2835619 (1958-05-01), Millis et al.
patent: 2887421 (1959-05-01), Peras
patent: 3155498 (1964-11-01), Jandras
patent: 3607458 (1971-09-01), Hunsaker et al.

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