347 Stainless Steel

347 Stainless Steel

Nickel (Ni) - 11.0
Chromium (Cr) - 18.0
Iron (Fe) - 69.0
Manganese (Mn) - 1.0
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 11.0
  • Chromium (Cr) 18.0
  • Iron (Fe) 69.0
  • Manganese (Mn) 1.0
  • Carbon (C) 0.06
  • Phosphorus (P) 0.03
  • Sulfur (S) 0.01
  • Silicon (Si) 0.5
  • Niobium (Nb) + Tantalum (Ta) 0.5

UNS S34700

347 Stainless fasteners are used in corrosive environments where temperatures may cycle to over 800º F (425º C). Oil refinery applications are common. Other uses for 347 Stainless are in heat sensors and thermocouples.

321 Stainless (UNS S32100/ASTM A193 B8T) is a very close relative. While 347 Stainless is stabilized by the addition of columbium and tantalum to resist intergranular corrosion, 321 is stabilized by the addition of titanium.

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Summary

  • Environment:
    Severe Environments: Hot Concentrated Acids & Chemicals
  • Temperature Limit:
    1500 °F / 816 °C
  • Ultimate Tensile (Typical):
    75 ksi / 515 mpa

Specifications & Technical Data

If your question isn’t answered below, download the technical data sheet here.

Specifications

  • Bolts: ASTM A193, ASME SA193 B8C
  • Nuts: ASTM A194 8C, ASME SB 194 8C

Applications

  • Aircraft Collector Rings
  • Aircraft Exhaust Stacks
  • Boiler Casings
  • Cabin Heaters
  • Furnace Heating Elements
  • Heavy Wall-Welded Equipment
  • Chemical Processing
  • Gaskets

Physical Properties

Density
288 lb/in3
Melting Range
1398 – 1446°C
Specific Heat Capacity 500 J/kgK
Thermal Conductivity (@100 °C) 16.3 [W/mK]

Mechanical Properties

Yield Strength, Mpa 205
Tensile Strength, Mpa 515
Elongation, % 40
Hardness [Brinell] 201
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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

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