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Super Austenitic 904L Alloys
Physical Properties of Super Austenitic 904L Alloys in the Annealed Condition at -20°F to +100°F
| Tensile Strength | Yield Strength | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy | UNS Designation | Spec. | psi | MPa | ksi | psi | MPa | ksi | Elongation in 2 in. (min.) % | Grain Size Req. | Max. Hardness | Modulus of Elasticity (x106psi) | 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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