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Alloy 347 & 347H Stainless Steel

Alloy 347 & 347H Stainless Steel for Sale

Alloy 347 & 347H Stainless Steel

Austenitic stainless steel stabilized with titanium, columbium and tantalum.


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.


 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

Type Sizes Schedules ASTM Standards
Bar A276, A479
Butt Weld Fittings 1/2″ thru 12″ Sch 10, 40, 80, 160 & XXH A403
Forgings A182
Pipe Welded & Seamless 1/4″ thru 16″ Sch 10, 40, 80, 160 & XXH A312
Tube, Welded A249
Tube, Seamless A213
Plate A240
Flange & Pressure Fittings All Descriptions