Duplex stainless is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades with similar corrosion resistance qualities.
One of the main attractions of duplex stainless steel is cost – due to the materials increased yield strength it is often possible to reduce the thickness of material making it much cheaper than a comparative austenitic stainless steel grade.
Also Duplex steel has a lower alloy content reduces production costs. Certainly cost and weight savings without loss of performance is an attractive proposition to purchasers.
Benefits of using UNS32205 Duplex Stainless Steel
- Similar corrosion resistance to Type 304
- Greater tensile and yield strength
- Good ductility and toughness though not as good as austenitic grades
- Good stress corrosion cracking resistance (SSC)
- Opportunity for purchases to reduce their material costs without compromising on quality
About 2205
2205 is the most common duplex alloy which contains 22% chromium and 5% nickel. Please refer to the chemical composition and mechanic properties tables below. For information on "SuperDuplex" which provides higher corrosion resistance please click on the links to SuperDuplex grades at the top of this page.
Chemical Composition
| UNS No |
Grade |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
N |
Other |
| S32205 |
2205 |
0.030 |
1.00 |
2.00 |
0.030 |
0.020 |
22.0/23.0 |
3.0/3.5 |
4.5/6.5 |
0.14/0.20 |
–– |
Mechanical Properties
| UNS No |
Grade |
Proof Stress
0.2% (MPa) |
Tensile Strength
(MPa) |
Elongation
A5 (%) |
Hardness (Max) |
| HB |
HRB |
| S32205 |
2205 |
450 |
620 |
20 |
293 |
31* |
* Rockwell C Scale
| UNS S32205 Duplex Steel Pipes |
| UNS S32205 |
Seamless Pipe |
| UNS S32205 |
ERW Pipe |
| UNS S32205 Duplex Steel Tubes |
| UNS S32205 |
Seamless Tube |
| UNS S32205 |
ERW Tube |
| UNS S32205 |
Capillary Tube |
| UNS S32205 Duplex steel Buttweld Fittings |
| UNS S32205 |
Elbows |
| UNS S32205 |
Long Radius Elbow |
| UNS S32205 |
Short Radius Elbow |
| UNS S32205 |
90 Deg Elbow |
| UNS S32205 |
45 Deg Elbow |
| UNS S32205 |
180 Deg Elbow |
| UNS S32205 |
1D Elbow |
| UNS S32205 |
3D Elbow |
| UNS S32205 |
5D Elbow |
| UNS S32205 |
Tee |
| UNS S32205 |
Equal Tee |
| UNS S32205 |
Reducing Tee |
| UNS S32205 |
Reducer |
| UNS S32205 |
Concentric Reducer |
| UNS S32205 |
Eccentric Reducer |
| UNS S32205 |
End Cap |
| UNS S32205 |
Cap |
| UNS S32205 |
Stubend |
| UNS S32205 |
Long Stubend |
| UNS S32205 |
Short Stubend |
| UNS S32205 |
Nipple |
| UNS S32205 |
Swage Nipple |
| UNS S32205 |
Barrel Nipple |
| UNS S32205 |
Reducing Nipple |
| UNS S32205 |
Bend |
| UNS S32205 |
Long Radius Bend |
| UNS S32205 |
Piggable Bend |
| UNS S32205 Forged Fittings |
| UNS S32205 |
Union |
| UNS S32205 |
Coupling |
| UNS S32205 |
Full Coupling |
| UNS S32205 |
Cross |
| UNS S32205 |
Hex Nipple |
| UNS S32205 |
Plug |
| UNS S32205 |
Bushing |
| UNS S32205 |
Boss |
| UNS S32205 |
Insert |
| UNS S32205 |
Adapter |
| UNS S32205 |
Socket |
| UNS S32205 |
Forged Tee |
| UNS S32205 |
Olets |
| UNS S32205 |
Weldolet |
| UNS S32205 |
Sockolet |
| UNS S32205 |
Elbowlet |
| UNS S32205 |
Thredolet |
| UNS S32205 |
Nipolet |
| UNS S32205 |
Latrolet |
| UNS S32205 |
Sweepolet |
| UNS S32205 |
Half Coupling |
| UNS S32205 Fasteners |
| UNS S32205 |
Screw |
| UNS S32205 |
Hex Set Screw |
| UNS S32205 |
Socket Screw |
| UNS S32205 |
Cap Screw |
| UNS S32205 |
Pan Head Screw |
| UNS S32205 |
Machine Screw |
| UNS S32205 |
Socket Head Cap Screw |
| UNS S32205 |
Allen Cap screw |
| UNS S32205 |
Wing Screw |
| UNS S32205 |
Washers |
| UNS S32205 |
Spring Washers |
| UNS S32205 |
Studs |
| UNS S32205 |
Anchors |
| UNS S32205 |
Marine Anchors |
| UNS S32205 |
Nut |
| UNS S32205 |
Hexagon Nut |
| UNS S32205 |
Hex Nut |
| UNS S32205 |
Hex Coupling Nut |
| UNS S32205 |
Hex Domed Cap Nuts |
| UNS S32205 |
Square Nut |
| UNS S32205 |
Stud Bolts |
| UNS S32205 |
Hex Head Bolts |
| UNS S32205 |
Socket Hexagon Head Screw Anchor Bolt |
| UNS S32205 |
U- Bolts |
| UNS S32205 |
J Bolts |
| UNS S32205 |
Mushroom Head Square Neck Bolts |
| UNS S32205 |
T-Head Bolts |
| UNS S32205 |
Wing Screw |
| UNS S32205 |
Eye Bolt |
| UNS S32205 |
Foundation Bolts |
| UNS S32205 |
Structural Bolts |
| UNS S32205 Bars |
| UNS S32205 |
Round Bar |
| UNS S32205 |
Bright Bar |
| UNS S32205 |
Polish Bar |
| UNS S32205 |
Black Round Bar |
| UNS S32205 |
Forged Bar |
| UNS S32205 |
Forged Round Bar |
| UNS S32205 |
Hex Bar |
| UNS S32205 |
Forged Hex Bar |
| UNS S32205 |
Flat Bar |
| UNS S32205 |
Rod |
| UNS S32205 sheets, Coils & Plates |
| UNS S32205 |
Sheets |
| UNS S32205 |
Coils |
| UNS S32205 |
Circle |
| UNS S32205 |
Ring |
| UNS S32205 |
Plates |
| UNS S32205 |
Strips |
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