duplex-plateHas high amount of chromium and a slight amount of nickel. Called ‘duplex’ because it combines both austenitic (chromium-nickel) and ferritic (chromium only) molecular structures. Duplex stainless steel  offersgreater strength and higher resistance to stress-corrosion cracking than most other types of stainless steels, and is used mainly in desalination plants, heat exchangers, and marine applications.

Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Their micro structures 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.

We holds a comprehensive stock of Duplex stainless steel plate in material grades S31803, S32205, and 1.4462./Plates are stocked as large format (up to 12,000 mm long and 3,000 mm wide) which is designed to minimise fabrication costs for our customers by reducing the amount of welding required.

 

Chemical Composition (average %)

C Si Mn Cr Mo Ni N
0.025 0.60 1.30 22.60 3.20 5.80 0.17

 


Standards

EN / DIN ASTM UNS AFNOR
<1.4462 >
X2CrNiMoN22-5-3
A240 S31803 Z2CND22-5 Az

Mechanical Properties

Condition: solution annealed

Product Dimension
Size
mm
0.2% proof stress
N/mm2
min.
Tensile strength
N/mm2
Elongation A5
% min.
L Q T
Impact strength
(ISO-V)
J min.
L Q T
St
≤ 160
450
650 – 880
25
100
Bl
≤ 75
460
640 – 840
252) 252)
90 60

St = Bar ,
Bl = Sheet or plate
L = Longitudinal, Q = Transverse, T = Tangential
1) For sheet or plate < 3mm = A80mm specimen
The values for other products and dimensions shall be established by
agreement.

 

High Temperature Properties

Condition: solution annealed

0.2% proof stress
N/mm2
min.
Temperature
100°C
150°C
200°C
250°C
360
335
315
300


Welding

Good weldability. Welding is possible with all processes usual for stainless steels. We recommend depending on applications electric arc welding with covered electrodes, inert gas welding or SA-welding. Preheating and heat treatment after welding is not necessary. For high stressed heavy walled constructions the limited preheat temperature of 150°C maximum is recommendable. Maximum interpass temperature 150°C. Keep heat input low especially for small wall thicknesses. The TIG-process should be given reference for root welding.

To find out more about Triton Alloys Inc Services and our Range of “ Duplex Stainless Steel” which we can supply directly to you, Click Here to Contact Us.