Duplex stainless steel having improved strength and corrosion re

Details Duplex stainless steel having improved strength and corrosion re Duplex stainless steel having improved strength and corrosion re

1992-11-10

1994-03-29

Yee, Deborah

Metal treatment

Stock

Ferrous

148327, C22C 3844

Patent

active

052980936

ABSTRACT:
A duplex stainless steel has a chemical composition consisting essentially, on a weight basis, of: C: 0.03% or less, Si: 1.0% or less, Mn: 1.5% or less, P: 0.040% or less, S: 0.008% or less, sol.Al: 0.040% or less, Ni: 5.0-9.0%, Cr: 23.0-27.0%, Mo: 2.0-4.0%, N: 0.24-0.32%, W: greater than 1.5% and at most 5.0%, optionally at least one element selected from the group consisting of Cu: 0.2-2.0% and V: 0.05-1.5% and/or the group consisting of Ca: 0.02% or less, Mg: 0.02% or less, B: 0.02% or less, and one or more rare earth metals: 0.2% or less in total, and a balance of Fe and incidental impurities. The chemical composition has a value of at least 40 for PREW defined by the following formula (a):

REFERENCES:
patent: 2432616 (1947-12-01), Franks et al.
patent: 2432617 (1947-12-01), Franks et al.
patent: 3649376 (1972-03-01), Decroix
patent: 4500351 (1985-02-01), Bond et al.
patent: 4765953 (1988-08-01), Hagenfeldt et al.

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