Thursday, November 4, 2010

Re: additional detail[MW:8067] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L

Hi,

Grade 316L, the low carbon version of 316 is immune from
sensitisation (grain boundary carbide precipitation).

So, there will be no problem if you do PWHT at temperature 600 DEG
CELSIUS for SS316L.

Regrads

Prabhakar,
BV

On 03/11/2010, Kathalingam Babu <kathalingam.qaqc@ppl.com.sg> wrote:
> Hi
>
> Apologies for the incorrect spelling of "Sensitization"
>
> Regards
>
> K.Babu
> Singapore
>
> ----- Original Message -----
> From: Kathalingam Babu
> To: materials-welding@googlegroups.com
> 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
> To: materials-welding@googlegroups.com
> 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
> To: materials-welding@googlegroups.com
> 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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