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347H Stainless Steel Pipe and Tube

347H Stainless Steel is a columbium-stabilized austenitic stainless steel plate. It has good general corrosion resistance, as well as slightly better resistance in strong oxidizing conditions than grade 321. It has outstanding resistance to intergranular corrosion after exposure to temperatures from 800 – 1500°F (427 – 816°C). The alloy has good oxidation resistance and creep strength to 1500°F (816°C). It also shows good low temperature toughness.

Specifications: S34709


  • Airplane exhaust stacks
  • Collector rings
  • Annealing box covers
  • Expansion joints
  • Jet engine parts
  • Tubing
  • Fasteners
  • Flexible metal hose and bellows

347H Stainless Chemical Properties:

Grade C Mn Si P Cr Ni S Co+Ta Fe
347H 0.010 max 2.00 max 0.75 max 0.045 max 17.00-19.00 9.00-13.00 .030 max 8x (C+N)min-1.00 max Balance

347H Stainless Mechanical Properties:

Grade Tensile Strength ksi (min) Yield Strength 0.2% ksi (min) Elongation %
347H 75 30 40

347H Stainless Physical Properties:

Thermal Conductivity
Modulus of
(psi x 10^6)
Coefficient of
Thermal Expansion
°F x 10-6
Specific Heat
 .288 133 at 200°F 72 at 20°F 28 9.20 at 68 – 212°F 0.1200 at 32°F to 212°F 2550-2635

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