Pitting resistant duplex stainless steel alloy with improved mac

Details Pitting resistant duplex stainless steel alloy with improved mac Pitting resistant duplex stainless steel alloy with improved mac

1998-08-31

2000-03-07

Yee, Deborah

Metal treatment

Stock

Ferrous

148327, 148542, 148548, 420 58, 420 60, C22C 3842, C21D 900

Patent

active

060334975

ABSTRACT:
A highly pitting resistant duplex stainless steel alloy is provided which compromises in weight percentages: C: 0.10% and below; Si: 1.5% and below; Mn: 2.0% and below; Cr: 25.0% to 27.0%; Ni: 5.0% to 7.5%; Cu: 1.5% to 3.5%; N: 0.15% and below; Mo: 0.5% and below; and the remaining portion being substantially iron and unavoidable impurities. This alloy has greatly improved machinability when treated in the mold after casting by an accelerated heat treatment, as compared to the same alloy composition that is very slowly control cooled in a tightly closed heat treatment furnace.

REFERENCES:
patent: 5238508 (1993-08-01), Yoshitake et al.
patent: 5298093 (1994-03-01), Okamoto
patent: 5672215 (1997-09-01), Azuma et al.
European Search Report on Application No. PCT/US98/18292 corresponding to this U.S. application.
Carlsson, T., PRODEC, "How to solve machining problems in chip forming operations on stainless steels", pp. 1-12, Acciaio Inossic, 53 (3), pp. 9-12, Sept-Sept. 1986.

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