Re: [MW:7764] Re: forming head

As such there should not be problem of crack during formimg for SA 516 gr 70 material

However

i)what is the thickness of D/E if it is up to 40mm no need of intermidiate normalising or stress relieving  but higher thk D/E require intermidiate SR

ii) Forming  should be carried step wise and require slowl increase the applied force force(point pressing)

 

regards

 

Hegde

 

---

From: israr <ahmedisrar.nm@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Sat, 23 October, 2010 9:18:33 PM
Subject: [MW:7747] Re: forming head

Dear Mr.
Could you provide me the thickness which you are forming? What type of
the dish head. and what is the process?

If thckness is more calculate the fiber elongation and accordignly
intermediate heat treatment is required.

Regards
Israr Ahmed
Tata Projects Ltd.
India


On Oct 16, 5:09 pm, Navid Navidi <navid_751...@yahoo.com> wrote:
> Hello All,
> We are going to form a head for a presser vessel. Its diameter is about 3000mm.
> And it is made of A516Grade70. Unfortunately, while forming we have cracks on
> the material which cause rejection of the head.
> How can we form a crack-free head? Do we have to do the forming in several
> steps? Do we need heat treatment between forming steps?
> Thank you,
> Saied

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.