Value addition of Normalising SA106 GrB pipes when used per UCS66 (ASME BPV Sec VIII div1)

[Bathula Raghuram (Mumbai - PIPING)]

I was just going thro discussion on another forum on the subject issue,
thought we may dig more on this issue as it is very much of our use...

The reasons as per my reading/understanding are given below

This material to fall under Curve C, it has undergo not only Normalising
but also require Fine grain practice.

ASME defines fine grain practice in SA20, which applies to plate
material spec (please correct me here I may be wrong) and not for SA106

SA 106 is by specification for high temperature service, (my
understanding Fine grain size gives better strength in ambient and low
temperatures) and not for high temperature service

I request metallurgist's opinion on this issue, is it really
beneficial/economical to normalize SA106 just to switch between curves
(curve B to Curve C)? Please share your views.

[kumara bala]

my view on this topic

 

Sa106 being seamless pipe..manufacturers required to heat the raw materials above lower transformation..and forming the pipe..then cooiling by air..other types of cooling may be costlier...

 

so..this may be the reason..this pipes coming in normalised condirion,,this may be enough to meet the requiremnts of code...

 

correct me if i am wrong..