Astm A928 uns S31803 super duplex stainless steel pipe
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Duplex stainless steels are extremely corrosion resistant, work hardenable 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. The 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 stainless steels are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless.
Property data given in this document is typical for flat rolled products covered by ASTM A240/A240M. ASTM, EN or other standards may cover products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.
Equal Grade
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex UNS S31803 | 1.4462 | S31803 |
| Duplex UNS S32205 | 1.4462 | S32205 |
UNS S31803 Duplex Pipe Chemical Composition
| Grade | Duplex S31803 | Duplex S32205 |
| C | 0.030 max. | 0.030 max. |
| Mn | 2.00 max. | 2.00 max. |
| Si | 1.00 max. | 1.00 max. |
| P | 0.030 max. | 0.030 max. |
| S | 0.020 max. | 0.020 max. |
| Cr | 22.0 – 23.0 | 21.0 – 23.0 |
| Ni | 4.50 – 6.50 | 4.50 – 6.50 |
| Mo | 3.0 – 3.5 | 2.50 – 3.50 |
| N | 0.14 – 0.20 | 0.08 – 0.20 |
| Fe | 63.72 min. | 63.54 min |
UNS S31803 Duplex Pipe Mechanical Properties
| Element | Duplex S31803 | Duplex S32205 |
| Density | 7.805 | 7.805 |
| Melting Point | 0.285 | 0.285 |
| Tensile Strength | 1420 – 1465 | 1420 – 1465 |
| Yield Strength (0.2%Offset) | 2588 – 2669 | 2588 – 2669 |
| Elongation | 25 min. | 25 min. |
UNS S31803 Duplex Pipe Physical Properties
| Density | Thermal Expansion | Modulus of Elasticity | Thermal Conductivity | Electrical Resistivity |
| g/cm3 | K | Gpa | W/m.k | Ω.m |
| 7.805 | 13.7*10-6 | 200 | 19 | 0.085*10-6 |
Application
- Chemical processing
- Transport and storage
- Oil and Gas exploration and processing equipment
- Marine and other high chloride environments
- Pulp and paper digesters
- Liquor tanks and paper machines
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