Cast iron with spheroidal graphite and austenitic-bainitic mixed

Details Cast iron with spheroidal graphite and austenitic-bainitic mixed Cast iron with spheroidal graphite and austenitic-bainitic mixed

1983-12-16

1985-09-17

Skiff, Peter K.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

C21D 506

Patent

active

045418780

ABSTRACT:
A high ductility machinable cast iron with mixed austenitic-bainitic structure is made by a method which involves limiting the manganese content to less than 0.3% by weight and utilizing a substantially lower temperature austenitizing heat treatment (820.degree. to 830.degree. C.) for a shorter period (10 to 25 minutes) than has hitherto been considered to be necessary to achieve such structures. The low alloy cast iron can therefore be made from available scrap with low manganese content and at low cost.

REFERENCES:
patent: 3273998 (1966-09-01), Knoth et al.
patent: 3549431 (1970-12-01), de Castelet
patent: 3860457 (1975-01-01), Vourinen et al.
patent: 3893873 (1975-07-01), Hanai et al.
patent: 4222793 (1980-09-01), Grindahl

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