Re: [MW:30008] Requirement of double Normalizing of SA-516 Gr.70

Hi

We had faced this concern couple of times in our previous projects. Yes base material will lose strength when u apply such heat treatments. Best solution for this is to order plate directly from mill with end finish requirements (such as double normalising + SPWHT, if any). 

If u aren't able to approach mills check for available plates having tensile on the higher side, test it with simulation of double normalising. If the results satisfactory then you may utilise the plates for forming. 

Client requirements overrule the code requirements hence you have to comply and cannot take relaxation on it based on code.

If the dished end manufacture wants to perform intermediate normalising then it cannot be considered as normalising after forming. Hence client requirement of normalising after forming requires to be performed separately. 

If the dished end has long seam then ensure your PQR is qualified with double normalising or single normalising with aggregate time for both cycles (check specs of client if it is accepted, sometime client will specify that it has to be performed separately). 

During double normalising weld will lose its strength exorbitantly, hence to achieve required minimum strength you have to utilise consumables with higher strength. 

Consult consumable suppliers they will be able to assist you with right consumables. 

Hope you are clear now.

Sent from my iPhone

On Aug 30, 2019, at 10:46, 'Prakash Hegde' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Hi!

With multiple normalising.UTS gets deteoriates

Accordingly  ddelivery condition.of.plate.you req UTS on higher side than min requirement

Ii) Generaly for highet.thick weld.seam multiple Normalising.ll.reduce UTS as such Normalising criteria.is not.addressed in.Sec IX.or.Div 1 of ASME

THATS why most of the designer recomend Crown.n Petal.for higher thk.Dends

Regards

Hegde

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On Fri, 30 Aug 2019 at 11:51, Jayesh Parekh

<jayeshparekh34@gmail.com> wrote:

In our recent project i encounter one problem.

Material Grade : SA-516 Gr.70 Supply condition : Normalized

Dished end : Ellipsodial

Thickness : 45 mm

Forming process : Cold forming

Dished end have one cordal seam

Impact required at : -46 deg. C

so during cold forming vendor need one intermediate normalizing. and as per client requirement one more normalizing performed after complete dished end forming. So, total 2 time normalizing have to perform.

So, my question is ; 

(1) During plate order i have to take 2 normalizing cycle simulation ? Yes Or No? With Reason

(2) May I take benefit of Clause UCS-85 (i) of ASME sec-8 Div.1?

(3) Is same clause applicable for welding?

(4) And If i will perform double normalizing then I have to simply double the normalizing time or 2 separate normalizing i have to perform?

(5) What will be effect on weld and base material after 2 time Normalizing?

(6) if any one encountered such issues . please help to solve 

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