SA516 Gr70 Impact value at -45 deg.c for >90mm thickness

[Bathula Raghuram (Mumbai - PIPING)]

MDMT - 45 deg C.  Reactor MOC is SA 516 Gr. 70 normalized + S5 (ASME SecVIII div1)

 

In order to meet the min energy requirements during impact testing at -45 deg C, proposal to Quench and Temper the plates in stead of Normalising for higher thickness (in excess of 90mm in thickness)

 

Can anybody share their experience w.r.t. impact energy values of N and Q&T (do we need ask for transition curves?) plates for high thickness at temp -45 deg.C and colder.

 

[pjo...@technip.com]

Except for Impact values after PWHT, Q +T material are excellent (far
better than N/N +T). You have to take care of PWHT cycle (Soaking
Temperature should be ~15 deg. below the Tempering temperature.)

In this view, it is better to ask for the impact testing with simulated
heat treatment (PWHT) Cycles.

Best regards,

Prasad Joshi
e-mail: pjo...@technip.com
Phone: +971-(0)2-611-6643

"Bathula Raghuram
(Mumbai -
PIPING)" To
<R.Bathula@ticb.c <material...@googlegroups.com
om> >
Sent by: cc
materials-welding
@googlegroups.com Subject
[MW:362] SA516 Gr70 Impact value at
-45 deg.c for >90mm thickness
01/11/07 09:45 AM


Please respond to
materials-welding
@googlegroups.com

Save a tree...please don't print this e-mail unless you really need to.

Save a tree...please don't print this e-mail unless you really need to.

[Sudipto_...@fwuk.fwc.com]

I beleive SA 516 Gr 70 can be used upto -45 deg.C and the values can be
found in SA 20. For lower than that temp. Low temp. mat. shall be used.
Anyway if at all 516, 70 is used it is better to establish a document to
verify the Impact values such as you said transition curves and actual
material properties in accordance with compared to another material Impact
value having similar chemical and mech. prop.

Best Regards,
Sudipto Banerjee
Equipment Engg. Department
Office no. 0044-118-913 2295

=======================================================
Confidentiality Notice

This communication and the information it contains:-
(a) Is intended for the person(s) or organisation(s) named above and for no other person(s) or organisation(s).
(b) May be confidential, legally privileged and protected in law. Unauthorised use, copying or disclosure of any of it may be unlawful. If you have received this communication in error, please contact us immediately by email at Postm...@fwuk.fwc.com.
=======================================================

[Kural]

Bathula

 

Transition curves are recommended if you are looking for different values of impact energy for various temperature from 0 to -46 . These are generally practiced in HSLA steels where they have different energy requirements at -20 Degc and at -45 Deg C.

 

If you are looking for a minmum enegry level  only at -46 deg c then it may not be required.

 

With tempered materials you will be having issues with Postweld heattreatment which need to be addressed well in advnace when the thickness  requires postweld heat treatment.

 

Hope this helps

 

Regards

 

Kural

 

[rutvik dixit]

Dear All,
I beleive One must concetrate on the process
route of steel plant, how they made the plates?
Whether As Rolled/Normalise rolling/TMCP process/MAE
added or not.
IF mfr. TC gaurantee the props. at -45 degree
cent.then no need to go for further testing.

With Regards,
Rutvik
--- Kural <kur...@gmail.com> wrote:

Forgot the famous last words? Access your message archive online at http://in.messenger.yahoo.com/webmessengerpromo.php