6 Mo (UNS S31254) is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength compared with conventional austenitic stainless steels such as 316L.
The alloy can provide excellent resistance to stress corrosion cracking allowing tube cold forming and may be used without the necessity to re-anneal at testing up to 120°C.
Available tube product forms
Typical Applications
- Seawater handling systems
- Desalination plant equipment
- Paper and pulp
- Flue gas desulphurisation units in power plants
- Chemical processing
- Control and instrumentation tubes
Typical manufacturing specifications
- ASTM A213
- ASTM A269
- ASTM A312
- BS EN 10216 pt.5
- Also individual customer specifications.
Industries predominantly using this grade
Technical Data
Mechanical Properties
| Title |
UNS |
Werkstoff |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
Cu |
N |
| 316L |
S31603 |
1.4404 |
0.03 |
1 |
2 |
0.045 |
0.015 |
17.5 |
11.5 |
2.25 |
- |
- |
| 317L |
S31703 |
1.4439 |
0.03 |
1 |
2 |
0.045 |
0.3 |
19 |
13 |
3.5 |
- |
- |
| 904L |
N08904 |
1.4539 |
0.02 |
1 |
2 |
0.045 |
0.035 |
21 |
25.5 |
- |
- |
- |
| 6mo |
S31254 |
1.4547 |
<0.02 |
0.7 |
1 |
0.03 |
0.01 |
20 |
18 |
6.1 |
0.75 |
0.2 |
| 625 |
N06625 |
2.4856 |
0.1 |
0.5 |
0.5 |
0.015 |
0.5 |
21.5 |
58 |
8.5 |
- |
- |
| C276 |
N10276 |
2.4819 |
0.01 |
0.08 |
1 |
0.04 |
0.03 |
15.5 |
55 |
16 |
Co
2.5 |
W
3.75 |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) |
500 |
J.kg-1.°K-1 |
| Thermal Conductivity |
14 |
W.m -1.°K-1 |
| Thermal Expansion |
16.5 |
μm/μm/°C |
| Modulus Elasticity |
196 |
GPa |
| Electrical Resistivity |
8.5 |
μohm/cm |
| Density |
8.0 |
g/cm3 |
Mechanical Properties
| Temper |
Annealed |
| Tensile Rm |
98 |
ksi (min) |
| Tensile Rm |
675 |
MPa (min) |
| R.p. 0.2% Yield |
45 |
ksi (min) |
| R.p. 0.2% Yield |
310 |
MPa (min) |
Elongation
(2” or 4D gl) |
35 |
% (min) |