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Test coupon from A890 1C melt.

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

Physical Properties

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.