Wednesday, November 3, 2010

Re: additional detail[MW:8046] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L

Hi
 
Apologies for the incorrect spelling of "Sensitization"
 
Regards
 
K.Babu
Singapore
 
----- Original Message -----
Sent: Wednesday, November 03, 2010 5:32 PM
Subject: Re: additional detail[MW:8044] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L

Hi Karthik
 
Yes there is more chances for the sensitation , if you SR at the sensitation temp. range after forming. 
 
Cold forming of SS316L  is generally SR Iis not required, as it is having good ductility and formability.
 
Also we need to have the Capcity of Equipment is higher than what we using for the SS304.
 
Upto 8 mm thk, very well formed , with generally available equipments.
 
Regards
 
K.Babu
Singapore
 
 
---- Original Message -----
From: Karthik
Sent: Wednesday, November 03, 2010 4:17 PM
Subject: Re: additional detail[MW:8043] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L

hI,

I agree with Mr.Babu.But as far as i know Sensitation Temp.range for SS316L is 450 to 600 degrees.

My doubt is If Sensitation Temp.range for SS316L is of 600 to 850 means,In case of doing Stress reliving(some times after forming needed) around 850 degrees will it get sensitised?


Thanks & Regards,

(Karthik)

Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Wed, 11/3/10, Kathalingam Babu <kathalingam.qaqc@ppl.com.sg> wrote:

From: Kathalingam Babu <kathalingam.qaqc@ppl.com.sg>
Subject: Re: additional detail[MW:8039] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L
To: materials-welding@googlegroups.com
Date: Wednesday, November 3, 2010, 3:02 PM

Hi
 
SS 316L doesn't have any Stabilizing elements. Since the lower percentage of carbon , the tendency of Cr Carbide formation is less.
 
Sensitation temperature range for the SS316 is typically in the range of 600~850 deg. cel.
 
If you want to do PWHT, you may do less than 575 deg. cel. and increase the soaking time accordingly.
 
In my opinion, I'll not recommend for PWHT with internals.
 
Regards,
 
K.Babu
Singapore
 
 
----- Original Message -----
From: Karthik
Sent: Wednesday, November 03, 2010 3:45 PM
Subject: Re: additional detail[MW:8038] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L

hi,

If you PWHT with Austenitic SS (SS316) internal sensitation happened at 450 to 600 degrees which will reduce the corrosion resistance of SS316(chromium becomes chromium carbide).

But in your case it is SS316L ,for this it may PWHT since 'L" grade has stabilising elements like Ti,Cb,Nb which will help to reduce the sensitation.

So if you are not ready to dismantle the internal for PWHT,you may go with SS316L internal for PWHT. 

Thanks & Regards,

(Karthik)

Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Wed, 11/3/10, asad azmi <azmiasadayub@gmail.com> wrote:

From: asad azmi <azmiasadayub@gmail.com>
Subject: [MW:8034] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L
To: materials-welding@googlegroups.com
Date: Wednesday, November 3, 2010, 1:44 PM

Dear All,
 
Greetings.
 
Contractor is doing PWHT of the Carbon Steel Vessel along with  SS316L  INTERNALS ( BEAMS, CHANNELS) Bolted with the Vessel.  PWHT temperature is 600 DEG CELSIUS.
 
Pls  suggest me whether it is allowed. what will be the effect on mechanical proerties/corrosion ressiatnce  proerties of SS 316L becuase of the PWHT Temperature.
 
Thanks in advance for your valuable suggestions.
 
Regrads
--
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.

--
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.
--
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.

--
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.

--
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.

No comments:

Re: [MW:34832] Inquiry about Single Bevel with Back Grinding

Dear Uday, As per your question that one is called with backing only,Simple both side you are welding it is backing with strip or without st...