Duplex Steel

Duplex Steel

Duplex stainless steels are extremely corrosion resistant, work hard enable alloys. Their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic and ferritic stainless steels. This combination of properties can mean some compromise when compared with pure austenitic and pure ferritic grades.

Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Strengths of duplex stainless steels can in some cases be double that for austenitic stainless steels.

Whilst duplex stainless steels are considered resistant to stress corrosion cracking, they are not as resistant to this form of attack as ferritic stainless steels. However, the corrosion resistance of the least resistant duplex stainless steels is greater than that for the most commonly used grades of stainless steels, i.e. 304 and 316.

Duplex steels are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless steel.

Chemical Composition of Duplex Steel

Chemical Element

% Present

Carbon (C)

0.0 - 0.03

Chromium (Cr)

21.00 - 23.00

Manganese (Mn)

2.00 max

Silicon (Si)

1.00 max

Phosphorous (P)

0.0 - 0.03

Sulphur (S)

0.0 - 0.02

Nickel (Ni)

4.50 - 6.50

Nitrogen (N)

0.08 - 0.20

Molybdenum (Mo)

2.50 - 3.50

Iron (Fe)


We EXPORT, SUPPLY & STOCK the following Grades of Duplex Steel in form of pipes, tubes, sheets, bars, rods, wire & fabricated product like heat exchanger, pressure vessel, column & towers, etc.: