347H

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We are Distributors and Suppliers of 317H .

317H Fittings 317H Seamless Tube / Stainless Steel Tubes
317H Stainless Steel Tubing Stainless Steel Tubes
317H Seamless Pipe Stainless Steel Plates / Stainless Steel Sheets

347H stainless steel is a stabilized stainless steel that offers excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500°F. It is stabilized by the addition of columbium and tantalum. Stainless Steel 347 is advantageous for high-temperature service because of its good mechanical properties, as well as its high creep rupture properties. 

  • Excellent resistance to inter-granular corrosion
  • Advantageous for high-temperature service
  • High creep and stress rupture properties

Applications

  • Oil refineries 
  • Fired heater tubes 
  • Aircraft collector rings 
  • Aircraft exhaust stacks 
  • Boiler casings 
  • Cabin heaters 
  • Furnace heating elements 
  • Heavy wall-welded equipment

Nexus Metal & Alloys supplies 347H stainless steel plate in a variety of thicknesses up to 1". 347H stainless steel plate is supplied to UNS S34709.

Stainless Steel 347 UNS S34700 is advantageous for high temperature service because of its good mechanical properties . SS 347 also has excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800° to 1500° F. SS 347 is similar to SS 321 with respect to intergranular corrosion which is achieved through the use of columbium as a stabilizing element to maximize this feature. SS 347 can not be hardened through heat treating, but elevated properties may be obtained through cold reduction. SS 347H is a modification of SS 347 with a higher carbon content, to provide improved high temperature strength.

Chemical Composition

SS 347 SS 347H
Ni 9 – 13 9 – 13
Cr 17 – 19 17 – 19
C 0.08 max 0.04 – 0.10
Mo 3 – 4 3 – 4
Fe Balance
Mn 2 max 2 max
Si 0.75 max 0.75 max
S 0.03 max 0.03 max
P 0.045 max 0.045 max
Co + Ta 10xC min 
1.00 max
8xC min 
1.00 max

Specifications

Stainless Steel SS 347 / 347H
AISI 347 / 347H
UNS S34700 / S34709
Werkstoff Nr. 1.4550 / 1.4961

Mechanical & Physical Properties

Density 8.0 g/cm3
Melting Point 1454 °C (2650 °F)
Tensile Strength Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset) Psi – 30000 , MPa – 205
Elongation 35 %
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