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P91 & P92 Heat Treatment

The push toward higher efficiencies in power and process plants has resulted in a significant increase in the application of CSEF (Creep Strength Enhanced Ferretic) steels in high temperature services. These steels differ from "traditional" code material inasmuch as they gain their exceptional high temperature creep rupture properties based on a specific condition of microstructure, rather than the primary chemical composition of the materials. This means that the manufacturing and fabrication processes must be controlled carefully to ensure that the appropriate microstructure is achieved, failing which the material will suffer a significant reduction in creep strength properties.

History & Facts

  • Grade 91 was developed for high temperature service. Allowable stress of P91 is 2.5 times greater than P22.
  • Grade 91 was approved by ASME B&PV Code Section I and VIII in 1983-1984.
  • Grade 91 has been in service since the 1990s for retrofits of traditional fossil plants, new supercritical plants and new combined cycle plants.

Superheat FGH has extensive experience in the heat treatment of P91 & P92 alloys. We can provide P91 heat treatment and/or P92 heat treatment to your specifications or consult you on the best P91 & P92 heat treatment process for your application.

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