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347 Stainless Steel Sheet, Coil and Bar - AMS 5512, 5646


347 stainless steel is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel.  This material is stabilized against chromium carbide formation by the addition of columbium and tantalum. Since these elements have a stronger affinity for carbon than chromium, columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries. 347 should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC) or for welding under conditions which prevent a post-weld anneal.  347 is non-magnetic.

Standard Inventory Specifications 

  • UNS S34700
  • AMS 5512
  • AMS 5646
  • ASTM A 269
  • ASTM A 276
  • ASTM A193
  • ASME SA 269
  • ASME SA 276
  • EN 1.4550
  • PWA-LCS
  • GE-S400/1000
  • RR SABRe Edition 2
  • DFARS Compliant

Common Trade Names

  • ATI 347 (™ Allegheny Technologies)

Common Applications of 347 Stainless Steel

  • Aircraft collector rings
  • Aircraft exhaust stacks
  • Boiler casings
  • Cabin heaters
  • Furnace heating elements
  • Heavy wall welded equipment

Inventory Size Range

  • Sheet : 0.018" - 0.130"
  • Bar : 0.3125" - 8.000"
  • Hex Bar : 0.750" - 1.375"

Please contact us for more details.

The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.

347 Chemical Composition

Element Maximum Unless Range is Specified
321 347
Carbon 0.08 0.08
Manganese 2.00 2.00
Phosphorus 0.045 0.045
Sulfur 0.030 0.030
Silicon 0.75 0.75
Chromium 17.00-19.00 17.00-19.00
Nickel 9.00-12.00 9.00-13.00
Columbium+Tantalum - 10xC min to 1.00 max
Titanium 5x(C+N) min to 0.70 max -
Nitrogen 0.10 -
Iron Balance Balance

 

347 Physical Properties

 
Grade Density Modulus of Elasticity in Tension Melting Range
g/cm3 lb/in3
321 7.92 0.286 28 x 106 psi
193 GPa
1398-1446°C
2550-2635°F
347 7.96 0.288 28 x 106 psi
193 GPa
1398-1446°C
2550-2635°F

 

Mean Coefficient of Linear Thermal Expansion

Temperature Range Coefficients
°C °F cm/cm/°C in/in/°F
20-100 68-212 16.6 x 10-6 9.2 x 10-6
20-600 68-912 18.9 x 10-6 10.5 x 10-6
20-1000 68-1832 20.5 x 10-6 11.4 x 10-6

Thermal Conductivity

Temperature Range W/m·K Btu · in / hr · ft2 · °F
°C °F
20-100 68-212 16.3 112.5
20-500 68-932 21.4 147.7

 

Specific Heat

Temperature Range J/kg K Btu/lb · °F
°C °F
0-100 32-212 500 0.12

Magnetic Permeability

  • H/m Annealed
  • 1.02 Max

Electrical Resistivity

Temperature Range microhm·cm
°C °F
20 68 72
100 213 78
200 392 86
400 752 100
600 1112 111
800 1472 121
900 1652 126

Mechanical Properties and Yield Strength of 347

 
Property Type 321 Type 347
Yield Strength, 0.2% Offset
psi
MPa
30,000
205
30,000
205
Ultimate Tensile Strength,
psi
MPa
75,000
515
75,000
515
Percent Elongation in 2 in. or 51 mm 40.0 40.0
Hardness, Max.,
Brinell (Plate)
RB (Sheet & Strip)
217
95
201
92

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