347 Stainless Steel | 347 Bar

Shapes Available

  • Plate
  • Round Bar
  • Sheet


  • Manufacturing
  • Oil Refining
  • Petrochemical

Industry Names

  • 347H
  • 347 Stainless


  • Stainless Steel


  • AMS 5512
  • ASME SA240
  • ASTM A262 Practice E
  • UNS S34700
  • UNS S34709


  • Distributor Trays and Thermowells
  • Equipment In and Around Reactors
  • Fired Heater Tubes
  • Fluid Catalytic Cracking Units (FCC)
  • Hanger Rods
  • Oil Refineries


  • Good Resistance to Inter-Granular Corrosion in the As Welded Condition.
  • Maintains Good Corrosion Resistance in Applications Where the Temperature is Between 800°F and 1500° F

347 Stainless Steel is an austenitic stainless steel that contains chromium and nickel. This material is stabilized by a columbium and tantalum combination. The additions of these elements promotes improved inter-granular corrosion resistance. 347 stainless is non magnetic and has similar corrosion resistance to 304 stainless steel.

In strongly oxidizing environments 347 offers slightly better resistance to corrosion to 321. Depending on the form, plate, sheet or bar, the grain size and amount of carbon could possibly meet the 347H and 347S requirements.

347 stainless steel can be used in oil and gas, heater tubes, reactor equipment and many other applications.

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We work closely with many manufacturers in the aerospace & defense industry. We work with NADCAP approved heat treaters and testing laboratories. We can supply DFARS compliant material.

Metal Properties
Melting Range 2550-2635 °F
.2% Yield Strength 30 ksi
Density 0.286 lb/inch³
Elongation 40 %
Hardness Max, Brinell 201
Ultimate Tensile Strength 75 ksi
Chemical Composition
C.04 .08
Cb+TaCb10x 1.0
Cr17.0 19.0
Fe- Bal
Mn- 2.0
Ni9.0 13.0
P- .045
S- .03
Si- .75
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