Physical Properties of Super Austenitic 904L Alloys in the Annealed Condition at -20°F to +100°F
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Tensile Strength |
Yield Strength |
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| Alloy |
UNS Designation |
Spec. |
psi |
MPa |
ksi |
psi |
MPa |
ksi |
Elongation in 2 in. (min.) % |
Grain Size Req. |
Max. Hardness |
Modulus of Elasticity (x106 psi) |
Mean Coefficient of Thermal Expansion IN./ IN./ °F x 10-6) |
Thermal Conductivity (BTU-in/ ft2-h-°F) |
| 904L |
N08904 |
A249, A312 |
71,000 |
(490) |
71 |
31,000 |
(215) |
31 |
35 |
— |
90 Rb |
28.0 |
8.5 |
79 |
| 904L |
N08904 |
B673, B674 |
71,000 |
(490) |
71 |
31,000 |
(215) |
31 |
35 |
— |
— |
— |
8.5 |
79 |
Composition of Super Austenitic 904L tubing and pipe
| Grade |
904L |
| UNS Designation |
N08904 |
| Nickel (Ni) |
23.0 – 28.0 |
| Chromium (Cr) |
19.0 – 23.0 |
| Iron (Fe) |
Bal. |
| Molybdenum (Mo) |
4.0 – 5.0 |
| Titanium (Ti) Max. |
— |
| Aluminum (Al) Max. |
— |
| Cobalt (Co) Max. |
— |
| Tungsten (W) |
— |
| Vanadium (V) Max. |
— |
| Copper (Cu) Max. |
1.00 – 2.00 |
| Manganese (Mn) Max. |
2.00 |
| Niobium (Nb) plus Tantalum |
— |
| Carbon (C) Max. |
0.020 |
| Nitrogen (N) Max. |
0.10 |
| Silicon (Si) Max. |
1.00 |
| Sulphur (S) Max. |
0.035 |
| Phosphorous (P) Max. |
0.045 |
| Other Elements |
— |
Super Austenitic 904L Product Range
| Alloy |
UNS Designation |
Werkstoff NR. |
Specifications* |
| 904L |
N08904 |
1.4539 |
A269, A/SA249, B/SB674, A/SA312, B/SB673 |
*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.
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