Duplex alloys
Twice the annealed strength of austenitic and ferritic
Corrosion resistance of austenitic
Better toughness and ductility than ferritic
More expensive than 304, but can use thinner sizes, enabling weight reduction and keeping the cost difference down
Applications: Water systems, petrochemical and chemical process equipment, piping
|
Trade name |
UNS number |
C |
Mn |
Cr |
Ni |
Mo |
N |
|
2507 |
S32750 |
0.03, max |
1.2, max |
24 – 26 |
6 – 8 |
3 – 5 |
0.24 – 0.32 |
|
2205 |
S31803 |
0.03, max |
2.00, max |
21 – 23 |
4.5 – 6.5 |
2.5 – 3.5 |
0.08 – 0.20 |