GRADE S31803 – F51
Stainless, Duplex, Super Duplex
UNS S31803 – F51 : DUPLEX STAINLESS : ASTM A182, A276, A479, BS EN 10088
GENERAL SCOPE
The characteristic feature of duplex stainless steels is their dual phase microstructure, comprising of approximately 50% of austenitic and 50% of ferrite. This provides the material with an excellent combination of high strength and corrosion resistance.
Pitting Corrosion – The resistance to pitting corrosion may be compared to other grades by using the pitting index PREN. The higher the PREN value, the better the pitting resistance.
CHEMICAL COMPOSITION
| C | Si | Mn | P | S | Cr | Ni | Mo | N | PREN | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | . | . | . | . | . | 21.00 | 4.50 | 2.50 | 0.08 | 33.00 | 0.00 |
| Max | 0.03 | 1.00 | 2.00 | 0.030 | 0.020 | 23.00 | 6.50 | 3.50 | 0.20 | . | 0.00 |
MECHANICAL PROPERTIES
Condition: Solution Annealed and Water Quenched
| U.T.S | 90 KSI Min | (620 N/mm2) |
| 0.2% Proof Stress | 65 KSI Min | (450 N/mm2) |
| Elongation | 25 % | |
| Red of Area | 45 % | |
| CVN Impacts @ -40°C (-40°F) | 40 Joules | (30 ft-lbf) |