Hi!
Hot forming is carried in normalising range (900C)
For Gr11 plate following sequence can be followed
Hot forming + Normalising +Tempering
However it is recomended to ask plate mfgr for Simulation Heat treatment which you are going to follow and subsequent test results
Regards
Hegde P.B.
From: asad azmi <azmiasadayub@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thu, 9 December, 2010 1:43:20 PM
Subject: Re: [MW:8625] tempering of plates
The delivery condition for plate GR 12 is Normalized + Tempering.
it means inspite of doing re-tempering of plate. re-tempering can be done after hot forming of dished head.
for dished head Normalizing + Tempering is required after Hot Forming.
Regards
On Wed, Dec 8, 2010 at 8:30 PM, Prakash Hegde <pb.hegde@yahoo.com> wrote:
--Hi!What is the delivery condition of Gr11 plate i) is it NR + Tempering or ii)NR +ACC cooling + TemperingIn case of condition ii) you can not leave with only Tempering after Hot forming , You require to carry out NR + ACC cooling + Tempering after hot formingIncase of condition i) you can go for tempering after hot forming with temperature range of NRHowever you need to ask for simulated heat treatment condition form plate mfgrIn my openion why not to get the D/E with crown and petal and not single pieceRegardsHegde p.B.
From: asad azmi <azmiasadayub@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wed, 8 December, 2010 6:47:01 PM
Subject: [MW:8604] tempering of plates
--
Dear All,Greetings.A vessel is to be fabricated as per ASME SEC VIII DIV 1 for data as below-Plate Material - SA 387 GR 12 CL2 , 80 THK.Plate is to be used for dished head. as per the ASME SEC IIA normalizing and tempering is required for the plate.forming of Dished head will be by hot forming.during reveiw of MTC it was observed that Tempering temeprature was not meeting the requirement.therefore re - tempering is required for the plate.My question is whether re - tempering is required for the plate OR it can be done after Hot Forming of dished head.As per the requirment after hot forming, dished head will under go Normalizing and tempering.Pls suggest.Thanks in advance for your valuable suggestions.RegardsAsad Azmi
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