Physical Properties of 254-SMO 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) |
| 254-SMO |
S31254 |
A249, A312 |
98,000 |
675 |
98 |
45,000 |
310 |
45 |
40 |
— |
96 Rb |
28.0 |
8.5 |
90 |
Composition of 254-SMO tubing and pipe
| Grade |
254-SMO |
| UNS Designation |
S32154 |
| Nickel (Ni) |
17.5–18.5 |
| Chromium (Cr) |
19.5–20.5 |
| Iron (Fe) |
Bal. |
| Molybdenum (Mo) |
6.0–6.5 |
| Titanium (Ti) Max. |
— |
| Aluminum (Al) Max. |
— |
| Cobalt (Co) Max. |
— |
| Tungsten (W) |
— |
| Vanadium (V) Max. |
— |
| Copper (Cu) Max. |
0.50–1.00 |
| Manganese (Mn) Max. |
1.00 |
| Niobium (Nb) plus Tantalum |
— |
| Carbon (C) Max. |
0.020 |
| Nitrogen (N) Max. |
0.18–0.25 |
| Silicon (Si) Max. |
0.80 |
| Sulphur (S) Max. |
0.010 |
| Phosphorous (P) Max. |
0.030 |
| Other Elements |
— |
254-SMO Product Range
| Alloy |
UNS Designation |
Werkstoff NR. |
Specifications* |
| 254-SMO |
S31254 |
1.4547 |
A/SA249, A269, A270, A/SA312 |
*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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