UNS S31803 F51
Duplex F51 / UNS S31803 is a corrosion resistant, high strength steel that is typically used for pipes, valves and bolting connectors in severe environments such as the oil and gas industry.
- UNS S31803
- Werkstoff number 1.4462
- EN10088-3
- X2CrNiMoN22-5-3
- ASTM A182 F51
- NORSOK D41 to D45
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The word duplex is based upon the concept that the material has a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel formulated in the same material. The term “Super-Duplex” denotes high-performance Duplex steel based on elevated contents of chromium, nickel and molybdenum. These elements improve pitting corrosion resistance, while additions of nitrogen promoted structural hardening, raising the yield strength and ultimate strength values without impairing toughness.
Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steels, have significantly better toughness and ductility than ferritic grades (although they do not reach the values of austenitic grades), have a range of corrosion resistance comparable to the range for austenitic stainless steels, have very good stress corrosion cracking resistance.
Chemical Analysis
| C | Cr | Fe | Mo | Mn | N | Ni | P | S | Si | |
| Min | - | 21 | Balance | 2.5 | - | 0.1 | 4.5 | - | - | - |
| Max | 0.03 | 23 | 3.5 | 2 | 0.22 | 6.5 | 0.04 | 0.015 | 1 |
Mechanical Properties
| Tensile Strength (MPa /N/mm2 ) | 655-880 |
| 0.2% Proof Stress (MPa /N/mm2 ) minimum | 485 |
| Elongation (A5 & 4D) minimum | 25.00% |
| Reduction of Area minimum | 45.00% |
| Hardness (HB) maximum | 270 |
| Charpy V-notch Impact at ambient Temp (J) | 100 minimum |
| Charpy V-notch Impact at -46 deg C (J) | 45 minimum |
| Ultrasonic Testing | At customers; request |
| Ferrite Content | 35%-55% |
| Corrosion Test to ASTM G48 Method A | 25 deg C for 24 hours |
| Microstructure | Microstructure certified free from grain boundary carbides, sigma, chi and laves phases |
For more technical information download our F51 information sheet here
Applications:
F51 is used within the chemical processing, aerospace, oil and gas, power generation and heat treating industy.
Typical applications include
- pumps
- valves
- pipework / flanges
- bolting connectors & manifolds
- rings
- shafts
- forgings
- pressure systems
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