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Induction Hot Bending of P91 class pipe material and N & T

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R Subbarayalu

Mechanical
Nov 5, 2020
1
Dear Sir/Madam,

We are making P91 material piping for high pressure & temperature steam applications in super critical boilers.

For this, we take induction pipe bending process and then do Normalizing & Tempering heat treatment operations.
Our question is, whether it is allowed to use GREASE for measuring the pipe wall thickness using the D meter, on the hot bent P91 Pipe before the Normalizing & Tempering heat treatment operations.

It seems that no hydro-carbon based materials should not have contact with the P91 Pipe surface (after the induction bending operation) but before the N & T.. due to the metallurgical reasons .

Please clarify with technical literature support.

R Subbarayalu
 
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