Surface hardened powdered metal stainless steel parts

Details Surface hardened powdered metal stainless steel parts Surface hardened powdered metal stainless steel parts

1997-01-23

1998-07-21

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 29, 419 38, 419 58, C22C 3302, B22F 312

Patent

active

057829535

ABSTRACT:
Surface hardened ferritic or austenitic stainless steel articles, especially automobile exhaust flanges and Hego bosses, are produced as sintered powder metal parts having a relatively soft ferritic core and a hardened outer surface layer. The method of manufacturing such parts includes compacting a stainless steel powder, followed by sintering, repressing, and surface hardening in an atmosphere containing nitrogen so that the final part density is at least 88% of theoretical density. Such parts have improved strength and are useful as automotive exhaust flanges and Hego bosses.

REFERENCES:
patent: 4366008 (1982-12-01), Takeuchi et al.
patent: 4724000 (1988-02-01), Larson et al.
patent: 5080712 (1992-01-01), James et al.
patent: 5141554 (1992-08-01), Kijima
patent: 5393109 (1995-02-01), Gumpel
patent: 5417774 (1995-05-01), Garg et al.
patent: 5427600 (1995-06-01), Itoh et al.

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