Dear Ajay,
As a good engineering practice its good to have simulation test coupon heat treated with the Head and tested so that you can ensure that the mechanical properties are met.
But in my opinion simulation of normalizing is not mandatory.....
UCS 85(c) is not clear about upper critical temperature and hence I suggest you to seek Interpretation from ASME or look for some interpretation if readily available.
In my opinion Normalizing on head will reinstate the properties (similar to the supplied condition, i.e. Normalizing) which might have deteriorated during cold forming. Hence simulation of Normalizing is not required. Situation would be different if your supplied condition of plate would be "as rolled" (i.e without Normalizing).
Mechanical properties will not change even for n numbers of normalizing. Chances of change in Mechanical properties will only in case of accelerated cooling.
More comments to have better clarity from other members are highly appreciated.
Regards.
CK
-- As a good engineering practice its good to have simulation test coupon heat treated with the Head and tested so that you can ensure that the mechanical properties are met.
But in my opinion simulation of normalizing is not mandatory.....
UCS 85(c) is not clear about upper critical temperature and hence I suggest you to seek Interpretation from ASME or look for some interpretation if readily available.
In my opinion Normalizing on head will reinstate the properties (similar to the supplied condition, i.e. Normalizing) which might have deteriorated during cold forming. Hence simulation of Normalizing is not required. Situation would be different if your supplied condition of plate would be "as rolled" (i.e without Normalizing).
Mechanical properties will not change even for n numbers of normalizing. Chances of change in Mechanical properties will only in case of accelerated cooling.
More comments to have better clarity from other members are highly appreciated.
Regards.
CK
On 4 October 2010 15:17, DOKKU AJAY <akdd83@yahoo.com> wrote:
Dear All,Requested to feed in your comments.Design code is ASME Sec.VIII Div.1.Material: SA 516 Gr.70NThk (Nom):16mm after forming.No heat treatment of the equipment.We have a situation here wherein heads for vessels after cold forming have to be normalized, as per client specs. The plates (from stock) from whcih heads will be formed is already in normalized condition. No additonal simulation test results are reported in the MTC.As per, UCS 85 (c), material used in the vessel shall be represented by test specimens which have been subjected to the same heat treatments above the lower transformation temperature and post weld heat treament.....My understanding to the clause is, the test coupons from the same heat and plate no. shall be normalized along with the heads (by the froming vendor) to simulate the heating / cooling conditions and then shall be tested for mechanical properties (Tensile/Yield/Elongation) as per ASME Sec.II A requirement.Please confirm. Kindly also let me know, if any other precaution has to be taken.Dokku Ajay Kumar
Mobile: +966 500071054
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