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Test coupon from A995 3A melt.

A995 3A

Duplex Stainless

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Comparative Classifications

ASTM Specification

A995

ASME Specification

SA995

UNS (Cast)

J93371

UNS (Wrought)

SAE

AISI

Carbon:

0.06% Max

Silicon:

1.00% Max

Phosphorus:

0.04% Max

Manganese:

1.00% Max

Sulfur:

0.04% Max

Chromium:

24.00 - 27.00%

Nickel:

4.00 - 6.00%

Molybdenum:

1.75 - 2.50%

Nitrogen:

0.15 - 0.25%

Nitrogen + Carbon:

Vanadium:

Tungsten:

Aluminum

Titanium:

Copper:

Columbium:

Barium:

Boron:

Zirconium:

Cerium + Lanthanum:

Iron:

Residual Elements:

Tensile Strength:

95 ksi Min

Elongation at 2 in:

25% Min

Reduction of Area:

Yield Strength:

65 ksi Min

Chemical Composition

Physical Properties

Alloy Specification

A890 3A

J93371

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.