High nitrogen containing duplex stainless steel having high corr

Details High nitrogen containing duplex stainless steel having high corr High nitrogen containing duplex stainless steel having high corr

1986-09-05

1988-08-23

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 52, 420 59, 148325, 148327, C22C 3844

Patent

active

047659530

ABSTRACT:
According to the invention there is a high nitrogen containing duplex stainless steel with high corrosion resistance and good structure stability. Characteristic is the analysis of the alloy being in % by weight max 0.05% C, 23-27% Cr, 5.5-9.0% Ni, 0.25-0.40% N, max 0.8% Si, max 1.2% Mn, 3.5-4.9% Mo, max 0.5% Cu, max 0.5% W, max 0.010% S, max 0.5% V, max 0.18% Ce and Fe and normally present impurities, at which the contents of the alloying elements are so adjusted that the ferrite content after solution heat treatment at about 1075.degree. C. amounts to 30-55%. The analysis of the steel is so optimized that it in solution heat treated, cold worked and also welded condition is particularly suitable for use in such environments where the presence of chloride ions gives rise to a high corrosivity.

REFERENCES:
patent: 4500351 (1985-02-01), Bond et al.

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