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347/347H Alloys
Physical Properties of 347/347H 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 inches (min.) % | Grain Size Req. | Maximum Harndess | Modulus of Elasticity(x106psi) | Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) | Thermal Conductivity (BTU-in/ft2-h-°F) |
| 347 | S34700 | — | 75,000 | 515 | — | 30,000 | 205 | — | 35 | — | — | 29.0 | 9.2 | — |
| 347H | S34709 | — | 75,000 | 515 | — | 30,000 | 205 | — | 35 | 7 or coarser | — | 29.0 | 9.2 | — |
Composition of 347/347H tubing and pipe
| Grade | 347 | 347H |
|---|---|---|
| UNS Designation | S34700 | S34709 |
| Carbon (C) Max. | 0.08 | 0.04–0.10 |
| Manganese (Mn) Max. | 2.00 | 2.00 |
| Phosphorous (P) Max. | 0.04 | 0.04 |
| Sulphur (S) Max. | 0.03 | 0.03 |
| Silicon (Si) Max. | 0.75 | 0.75 |
| Chromium (Cr) | 17.0–20.0 | 17.0–20.0 |
| Nickel (Ni) | 9.0–13.0 | 9.0–13.0 |
| Molybdenum (Mo) | — | — |
| Nitrogen (N) | — | — |
| Iron (Fe) | Bal. | Bal. |
| Other Elements | Cb+Ta=10xC-1.0 | Cb+Ta=8xC-1.0 |
347/347H Product Range
| Alloy | UNS Designation | Werkstoff NR. | Specifications* |
|---|---|---|---|
| 347 | S34700 | 1.4550 | A269, A/SA249, A/SA312 |
| 347H | S34709 | — | A/SA249, 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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