A890 1C
Duplex Stainless
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Comparative Classifications
ASTM Specification
A890
ASME Specification
SA890
UNS (Cast)
J93373
UNS (Wrought)
S32550
SAE
AISI
Carbon:
0.03% Max
Silicon:
1.10% Max
Phosphorus:
0.03% Max
Manganese:
1.20% Max
Sulfur:
0.03% Max
Chromium:
24.00 - 26.70%
Nickel:
5.60 - 6.70%
Molybdenum:
2.90 - 3.80%
Nitrogen:
0.22 - 0.33%
Nitrogen + Carbon:
Vanadium:
Tungsten:
Aluminum
Titanium:
Copper:
1.40 - 1.90%
Columbium:
Barium:
Boron:
Zirconium:
Cerium + Lanthanum:
Iron:
Residual Elements:
Tensile Strength:
100 ksi Min
Elongation at 2 in:
25% Min
Reduction of Area:
Yield Strength:
65 ksi Min
Chemical Composition
Alloy Specification
Related Alloys
Frequently Asked Questions
Q. What is duplex stainless steel?
A. Duplex stainless steel is an alloy with a two-phase metallurgical structure consisting of austenite and ferrite in almost equal parts. The content composition of duplex steel has a higher level of chromium and molybdenum, lower nickel and a percentage of nitrogen between 0.05 to 0.50%. This composition, coupled with heat treatment, makes duplex stainless better at corrosion resistance (chloride stress corrosion and chloride pitting corrosion especially) and higher strength when compared to austenitic stainless.