Duplex stainless steel with high corrosion resistance

Details Duplex stainless steel with high corrosion resistance Duplex stainless steel with high corrosion resistance

1997-04-28

2000-04-11

Yee, Deborah

Metal treatment

Stock

Ferrous

148327, 420 67, 420 68, C22C 3844

Patent

active

060484136

ABSTRACT:
A corrosion resistant duplex stainless steel having an austenite-ferrite duplex phase matrix, less content of the expensive nickel and higher the resistance to both stress corrosion cracking and pitting in environments containing chloride ion is disclosed. The stainless steel is also scarcely influenced by the aging heat treatment. This stainless steel includes 20-30 wt % chromium, 3-9 wt % nickel, 3-8 wt % molybdenum, 0.20 wt % or less carbon, 0.5-2.0% silicon, 3.5 wt % or less manganese, 0.2-0.5% nitrogen and a balance of iron. The stainless steel may include at least one element selected from the group of 1.5 wt % or less titanium, 3 wt % or less tungsten, 2 wt % or less copper, and 2 wt % or less vanadium and include at least one element selected from the group of 0.001-0.01 wt % boron, 0.001-0.1 wt % magnesium, 0.001-0.1 wt % calcium, and 0.001-0.2 wt % aluminum.

REFERENCES:
patent: 4915752 (1990-04-01), Culling
patent: 5238508 (1993-08-01), Yoshitake et al.
patent: 5298093 (1994-03-01), Okamoto

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