PCC Energy Group


Stainless Steel Alloys

Product Information

Composition of 347/347H Pipe and Tubing
UNS DesignationS34700S34709
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
Physical Properties of 347/347H Alloys in the Annealed Condition at -20°F to +100°F
      Tensile StrengthYield Strength            
AlloyUNS DesignationSpec.psiMPaksipsiMPaksiElongation in 2 inches (min.) %Grain Size Req.Maximum HarndessModulus 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
347/347H Product Range
AlloyUNS DesignationWerkstoff 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.