Duplex UNS S31803/1.4462 is a duplex stainless steel with approximately 50% ferrite and 50% austenite.
This grade has good mechanical strength at room temperature, resistant to corrosive attack, including pitting and is resistant to stress corrosion cracking.
The grade is a successful alternative to the normal 300 series austenitic stainless steels, where its higher strength and resistance to stress corrosion cracking is required in critical applications.
Available Tube Product form
Typical Applications
- Processing & chlorate manufacturing
- Pressure vessels
Industries predominantly using this Grade
- Chemical processing equipment
- Food processing equipment
Typical Manufacturing Specifications
- ASTM A789
- Also, individual customer specifications.
Technical Data
Mechanical Properties (Room Temperature)
|
Property |
Annealed Temper |
| 0.2% Yield (Rp = 0.2) |
65 ksi (450 MPa) minimum |
|
Tensile (Rm) |
90 ksi (620 MPa) minimum |
| Elongation (2"gl) |
25% minimum |
| Hardness |
290 HV maximum |
Physical Properties (Room Temperature)
|
Specific Heat (0-100°C) |
500 |
J/kg/°K |
|
Thermal Conductivity @ 20C |
15 |
W/m/°K |
|
Thermal Expansion |
13 |
μm/m/°C |
|
Modulus Elasticity |
200 |
GPa |
|
Electrical Resistivity |
8.5 |
Ohm-cm |
|
Density |
7.8 |
g/cm3 |
Chemical Composition (% by weight)
|
Element |
Min |
Max |
|
C |
- |
0.030 |
|
Mn |
- |
2.00 |
| P |
- |
0.030 |
| S |
- |
0.020 |
| Si |
- |
1.00 |
| Ni |
4.5 |
6.5 |
| Cr |
21.0 |
23.00 |
| Mo |
2.5 |
3.5 |
| N |
0.08 |
0.20 |
| Fe |
Balance |