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Re: additional detail[MW:8043] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L

By Materials & Welding

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
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