Physical Properties of 347/347H 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 inches (min.) % |
Grain Size Req. |
Maximum Harndess |
Modulus of Elasticity(x106 psi) |
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.