Machines or machine parts made of austenitic cast iron...

Details Machines or machine parts made of austenitic cast iron... Machines or machine parts made of austenitic cast iron...

C - Chemistry, Metallurgy

22

C

75/119

C22C 33/08 (2006.01) C22C 37/04 (2006.01) C22C 37/08 (2006.01)

Patent

CA 1248781

MACHINES OR MACHINE PARTS MADE OF AUSTENITIC CAST IRON HAVING RESISTANCE TO STRESS CORROSION CRACKING Abstract: Austenitic cast iron has excellent corrosion resist- ing 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, 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 ?3.0, Si = 1.0 - 3.0, Mn ?1.5, P ?0.08, Ni >22.0, Cr ?5.5 and the balance being Fe are provided.

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