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: KarthikSent: Wednesday, November 03, 2010 3:45 PMSubject: 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.SQA/QC ManagerGetabec Energy Co.,Ltd.379,Moo6,Soi8,Nikhomphatana,Rayong-21180,Thailand.Phone: 0066 38 897035-8 (Off)Fax: 0066 38 897034Hand 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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