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Test coupon from A995 4A melt.

A995 4A

Duplex Stainless

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Comparative Classifications

ASTM Specification

A995

ASME Specification

SA995

UNS (Cast)

J92205

UNS (Wrought)

S31803

SAE

2205

AISI

Carbon:

0.03% Max

Silicon:

1.00% Max

Phosphorus:

0.04% Max

Manganese:

1.50% Max

Sulfur:

0.02% Max

Chromium:

21.00 - 23.50%

Nickel:

4.50 - 6.50%

Molybdenum:

2.50 - 3.50%

Nitrogen:

0.10 - 0.30%

Nitrogen + Carbon:

Vanadium:

Tungsten:

Aluminum

Titanium:

Copper:

1.00% Max

Columbium:

Barium:

Boron:

Zirconium:

Cerium + Lanthanum:

Iron:

Residual Elements:

Tensile Strength:

90 ksi Min

Elongation at 2 in:

25% Min

Reduction of Area:

Yield Strength:

60 ksi Min

Chemical Composition

Physical Properties

Alloy Specification

A890 4A

J92205

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.