Wednesday, December 8, 2010

[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.
 
Regards
 
Asad Azmi
 
 
 
 
 
 
 

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