Bend Joints
Bend Joints
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Super Critical System

P 91

P 91 material used for high temperature applications based on 9 % Cr and 1 % Mo with additions of Nb, V and N. Developed from 1974 by OAK RIDGE (USA) Main Standard : ASTM A 335 (P91) First practical use was made in power plants back in the early 90’s in the US and in UK both for tubes and pipes.


Grade 91 is mainly used for :

  • Super heaters
  • Headers
  • Streamlines

Typical working temperatures between 540°C and 610°C. Grade 91 is a precipitation strengthened alloy so particular care shall be taken to achieve the proper precipitation during fabrication of tunes/pipes.

Bend Joints