347 Stainless Steel Bar

347 stainless is an austenitic stainless steel offering an excellent resistance to inter-granular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500O F.  Alloy 347 alloyed with columbium-tantalum (referred to as niobium) allows good mechanical properties at high temperatures.


  • High temperature gaskets
  • Rocket engine parts
  • Expansion joints
  • Aircraft collector rings
  • Exhaust manifolds
  • Chemical production equipment
Typical Chemical Properties
347 Stainless Steel (annealed condition)
Minimum Properties
Ultimate Tensile Strength, psi 95,000
Yield Strength, psi 39,900
Elongation 45%
Rockwell Hardness B85
Iron (Fe) 68%
Carbon (C) 0.08% max
Chrome (Cr) 17%
Manganese (Mn) 2%
Nickel (Ni) 11%
Niobium (Nb) + Tantalum (Ta) 0.8%
Phosphorus (P) 0.045% max
Sulphur (S) 0.03%
Silicon (Si) 1%

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