Material Data Sheet

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Main Features
  • Creep rupture strength is much higher than SUS347HTB due to V, N and W content.
  • Excellent intergranular corrosion resistance due to lower C content.
  • Good steam oxidation resistance due to fine-grained microstructure.
  • Enough tharmal stability for boiler tube application.
  • Better weldability at elevated temperature than TP304H due to good phase stability.

  • Vd TÜV Material data sheet 554/2 Supplement 09.2009
  • UNS No. S34705
  • ASTM A213 TP347W
  • ASME SA-213 Code Case 2475

Chemical Composition


Mechanical properties

Tensile property requirement at room temperature


Physical properties

Coefficient of linear thermal expansion  [x10-6 /deg.C]

Modules of elasticity  [GPa]


Creep rupture properties

Fig.  Creep rupture test results of base metal.

Fig.  Effect of Nb, V, W and N on creep rupture time for 0.03C-18Cr-9Ni steel.


Corrosion resistance

Fig.  Results of intergranular corrosion test of aged tubes.

Fig.  Hot corrosion resistance of XA704.

Fig.  Steam oxidation resistance of XA704.


Thermal stability

Fig.  Change in Charpy impact value at 0 deg.C after aging.



Fig.  Results of Varestraint test.