Method of using machine parts made of austenitic cast iron havin

Details Method of using machine parts made of austenitic cast iron havin Method of using machine parts made of austenitic cast iron havin

1985-06-17

1989-08-29

Yee, Deborah

Metal treatment

Stock

Ferrous

420 9, 420 16, 417DIG1, C22C 3836

Patent

active

048613959

ABSTRACT:
Austenitic cast iron has excellent corrosion resisting properties and has been preferentially used in machines or machine parts intended for handling corrosive fluids such as seawater. Cases, however, have been reported of machines or machine parts made of austenitic cast iron failing after they had been put to prolonged service at relatively low temperatures. The present inventors have located stress corrosion cracking at the cause of this failure.
In accordance with the present invention, methods of using salt water resisting machines or machine parts made of austenitic cast iron that has graphite in the form of spheroids or nodules and which comprises by weight %: C.ltoreq.3.0, Si=1.0-3.0, Mn.ltoreq.1.5, P.ltoreq.0.08, Ni>24-28%, Cr.ltoreq.5.5 and the balance being Fe to minimize stress corrosion are provided.

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