Hi,Dhwani Desai,
If you look at ASME SA-335-2007, I would think the requirements are more detailed. Isothermal anneal would result materials with fairly low creep strength. Though the room temperature UTS and other properties may be acceptable, the problems may crop up later.
If would be good for the designer to look at the allowable stress values in ASME Sec-II, Part-C.
By all means Normalised and Tempered material would be better material due to even heat treatment and even properties thought out the thickness.
Thanks
Pradip Goswami,P.Eng
Senior Engineer/Specialist(Welding-Metallurgy)
ONTARIO POWER GENERATION Inc.
pgoswami@sympatico.ca
From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Wednesday, May 26, 2010 2:31 PM
To: GOSWAMI Pradip -THERMAL
Subject: FW: [MW:5250] <Security Level 2>Isothermal Annealing in place of normalizing & Tempering
To: materials-welding@googlegroups.com
Subject: [MW:5250] <Security Level 2>Isothermal Annealing in place of normalising & Tempering
Date: Wed, 26 May 2010 08:50:00 +0530
From: desaid@toyoindia.com
Dear All,
One of the vendors is giving Isothermal annealed pipes for pipe material A335 P22, P5 & P9 against our requisition requirement of Normalizing & Tempering.
As per ASTM the same is acceptable.
However, i will like to know the difference in the end product because of this different heat treatment.
Also; if some one can comment on the acceptance of the isothermal annealed pipes in place of normalised & tempered pipes.
Thanks & Regards,
Dhwani Desai
Planning & Piping Dept.
Ext.-7681
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