Call today for a free estimate
North America: +1-918-437-5400 • South America: +56-2-2243-9345 • Australia-Asia-NZ: +64-3-545-0445

Call today for a free estimate
North America: +1-918-437-5400
South America: +56-2-2243-9345
Australia-Asia-NZ: +64-3-545-0445

Alloy 347 & 347H Stainless Steel

Austenitic stainless steel stabilized with titanium, columbium and tantalum.

Applications

347 and 347H stainless steel is common in the petroleum refining industries. Alloy 347 and 347H stainless steel is used to make radiant superheaters, boiler tubes, high pressure steam pipe, and general refinery piping. They are also used for heavy-duty exhaust systems and manifolds.

Properties

Alloy 347 stainless steel are austenitic stainless steels that contain stabilizing elements. This alloys is easily welded. Annealing may not be required after welding unless stress relief is desired. 347 stainless steel has excellent resistance to oxidation and corrosion. With high creep strength, 347 stainless steel work best up to 1600 °F. The addition columbium plus tantalum in 347 stainless steel give some desired characteristics like:

  • Prevents harmful carbide precipitation in the heat affected zone (HAZ) of the weld area
  • Imparts substantial immunity to intergranular corrosion
  • Reduced embrittlement in the HAZ of the weld area

 

Specifications

TypeSizesSchedulesASTM Standards
BarA276, A479
Butt Weld Fittings1/2″ thru 12″Sch 10, 40, 80, 160 & XXHA403
ForgingsA182
Pipe Welded & Seamless1/4″ thru 16″Sch 10, 40, 80, 160 & XXHA312
Tube, WeldedA249
Tube, SeamlessA213
PlateA240
Flange & Pressure FittingsAll Descriptions