Ferritic-martensitic stainless steel alloy with deformation-indu

Details Ferritic-martensitic stainless steel alloy with deformation-indu Ferritic-martensitic stainless steel alloy with deformation-indu

1988-10-14

1991-09-10

Yee, Deborah

Metal treatment

Stock

Ferrous

148327, 420 34, C22C 3858

Patent

active

050470965

ABSTRACT:
The present invention relates to a ferritic-martensitic Mn-Cr-Ni-N-steel in which the austenite phase is transformed into martensite at cold deformation so that the steel obtains high strength with maintained good ductility. The distinguishing feature is an alloy analysis comprising max 0.1% C, 0.1-1.5% Si, max 5.0% Mn, 17-22% Cr, 2.0-5.0% Ni, max 2.0% Mo, max 0.2% N, balance Fe and normal amounts of impurities whereby the ferrite content is 5-45% and austenite stability, S.sub.m, expressed as S.sub.m =462 (% C+% N)+9.2% Si+8.1% Mn+13.7% Cr+34% Ni shall fulfill the condition 475<S.sub.m <600.

REFERENCES:
patent: 4798634 (1989-01-01), McCune, III et al.
patent: 4798635 (1989-01-01), Bernhardsson et al.
Guy et al., Elements of Physical Metallurgy, Third Edition (1974) pp. 533-535.
European Search Report.

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