High Alloy Materials

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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