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347 Stainless Steel Sheet & Coil - AMS 5512

347 Coil
347 Sheet
Available Thicknesses in Inches
.113 - .130
.083 - .098
.070 - .083
.056 - .066
.045 - .052
.037 - .045
.029 - .033
.022 - .026
.018 - .022
Available Thicknesses in Millimeters
2.870 - 3.302
2.108 - 2.489
1.778 - 2.108
1.422 - 1.676
1.143 - 1.321
0.940 - 1.143
0.737 - 0.838
0.559 - 0.660
0.457 - 0.559
  • 347 Stainless Steel
    347 Stainless Steel

Type 347 is a stabilized stainless steel with the addition of coumbium and tantalum.  This material offers good mechanical properties with higher creep and stress rupture characteristics than other grades.  347 is also advantageous in applications that require omission of the annealing process after welding.

Common Applications of 347 Stainless Steel

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

We suppy 347 stainless steel sheet in widths of 48" down to .250" and standard lengths of 96" and 120" but are capable of shearing and leveling to your required lengths and widths.  347 coil can also be slit to your desired width.

Specifications and Related Metals

  • AMS 5512
  • ASTM A269
  • ATI 347 (™ Allegheny Technologies)

All of our 347 sheet and coil are ordered to specific decimal thicknesses.  The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.

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347 General Properties

Type 347 is stabilized stainless steels which offer as their main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C). The material is stabilized by the addition of columbium and tantalum.

347 is also advantageous for high temperature service because of their good mechanical properties. The material offers higher creep and stress rupture properties than Type 304 and, particularly, Type 304L which might also be considered for exposures where sensitization and intergranular corrosion are concerns. This results in higher elevated temperature allowable stresses for these stabilized alloys for ASME Boiler and Pressure Vessel Code applications. 

Common Applications

Applications for 347 include those for welded construction and parts subjected to heating in the carbide precipitation range, aircraft collector rings, aircraft exhaust stacks, boiler casings, cabin heaters, carburetor air intensifier tubes, exhaust manifolds, fasteners, fire walls, flash boilers, flexible couplings, furnace heating elements, jet engine parts, large mufflers for stationary diesel engines, pressure vessels, stack liners, all-welded tank car for carrying chemicals, annealing box inner covers, collector rings, expansion joints, heat resistors, heavy wall welded equipment, welded tanks for storing organic chemicals, wire cloth and screens (industrial).

 

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

Resistance to General Corrosion

Type 347 offers similar resistance to general, overall corrosion as the unstabilized chromium nickel Type 304. Heating for long periods of time in the chromium carbide precipitation range may affect the material's general resistance  in severe corrosive media.

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