As expert said, Mf temp for this steel is around 150 degree celsius.
before taking up for PWHT, if u have not broughtdown the weldmentd
temp below 150( safely less than 100), untempered martensit present
will get tempered while while PWHT which will inferior mechanical
properties
That is why it is brought down to below 100 if pwht will take
immediate or bring down atmospheric temp
On 10/25/12, george.dilintas@gr.bureauveritas.com
<george.dilintas@gr.bureauveritas.com> wrote:
>
> That's right Pradip, lets always keep basic metallurgy in mind
>
> best regards
>
> Dr. Georgios Dilintas
>
> Authorized Nuclear Inspector
> Authorized Inspector Supervisor
> API 510 Inspector
>
> I&F REGIONAL TECHNICAL MANAGER
> BUREAU VERITAS PIRAEUS - GREECE
> Tel: +30 210 40 63 113/4
> Fax: +30 210 40 63 118
> Cell: +30 69 44 64 62 04
>
>
>
> "pgoswami"
> <pgoswami@quickcl
> ic.net> To
> Sent by: <materials-welding@googlegroups.com
> materials-welding >
> @googlegroups.com cc
>
> Subject
> 25/10/2012 02:25 [MW:15758] RE: 15748] Regarding p91
> intermediate cooling
> Ref
> Please respond to
> materials-welding
> @googlegroups.com
>
>
>
>
>
>
>
>
> Hi Govindaraju,
>
> This temperature corresponds to the Martensite finish temperature for this
> steel.Grade-91 is thorough hardening steel and produces martesite on air
> cooling. The best room temperature mechanical properties (tensile, impact
> and hardness) for this steel and the best high temperature creep
> properties are achieved when this steel is in fully tempered martensitic
> condition, i.e tempered @ 740-780 Deg C, following welding
>
> Cooling to this temperature ,80c-110C immediately following welding but
> prior to PWHT is strongly advisable.
>
> Thanks.
>
>
>
> Pradip Goswami,P.Eng.IWE
>
>
> Welding & Metallurgical Specialist
>
>
> Ontario, Canada.
>
>
> Email-pgoswami@sympatico.ca,
>
>
> pgoswami@quickclic.net
>
>
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of GOVINDARAJU RAJU
> Sent: Tuesday, October 23, 2012 4:43 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:15748] Reagrdin p91 intermediate cooling
>
> Dear sir
> I am doing qc engineer in power plant construction.I have doubt regarding
> P91 welding.After completion of welding, we are doing intermediate cooling
> at 80c-110C.What is the need of intemediate cooling?
>
> Rgds
> V.GOVINDARAJU
>
>
>
> --
> To post to this group, send email to materials-welding@googlegroups.com
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>
>
> 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.
>
>
>
>
> --
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>
>
> 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.
>
>
>
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>
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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.
before taking up for PWHT, if u have not broughtdown the weldmentd
temp below 150( safely less than 100), untempered martensit present
will get tempered while while PWHT which will inferior mechanical
properties
That is why it is brought down to below 100 if pwht will take
immediate or bring down atmospheric temp
On 10/25/12, george.dilintas@gr.bureauveritas.com
<george.dilintas@gr.bureauveritas.com> wrote:
>
> That's right Pradip, lets always keep basic metallurgy in mind
>
> best regards
>
> Dr. Georgios Dilintas
>
> Authorized Nuclear Inspector
> Authorized Inspector Supervisor
> API 510 Inspector
>
> I&F REGIONAL TECHNICAL MANAGER
> BUREAU VERITAS PIRAEUS - GREECE
> Tel: +30 210 40 63 113/4
> Fax: +30 210 40 63 118
> Cell: +30 69 44 64 62 04
>
>
>
> "pgoswami"
> <pgoswami@quickcl
> ic.net> To
> Sent by: <materials-welding@googlegroups.com
> materials-welding >
> @googlegroups.com cc
>
> Subject
> 25/10/2012 02:25 [MW:15758] RE: 15748] Regarding p91
> intermediate cooling
> Ref
> Please respond to
> materials-welding
> @googlegroups.com
>
>
>
>
>
>
>
>
> Hi Govindaraju,
>
> This temperature corresponds to the Martensite finish temperature for this
> steel.Grade-91 is thorough hardening steel and produces martesite on air
> cooling. The best room temperature mechanical properties (tensile, impact
> and hardness) for this steel and the best high temperature creep
> properties are achieved when this steel is in fully tempered martensitic
> condition, i.e tempered @ 740-780 Deg C, following welding
>
> Cooling to this temperature ,80c-110C immediately following welding but
> prior to PWHT is strongly advisable.
>
> Thanks.
>
>
>
> Pradip Goswami,P.Eng.IWE
>
>
> Welding & Metallurgical Specialist
>
>
> Ontario, Canada.
>
>
> Email-pgoswami@sympatico.ca,
>
>
> pgoswami@quickclic.net
>
>
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of GOVINDARAJU RAJU
> Sent: Tuesday, October 23, 2012 4:43 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:15748] Reagrdin p91 intermediate cooling
>
> Dear sir
> I am doing qc engineer in power plant construction.I have doubt regarding
> P91 welding.After completion of welding, we are doing intermediate cooling
> at 80c-110C.What is the need of intemediate cooling?
>
> Rgds
> V.GOVINDARAJU
>
>
>
> --
> 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/
> http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
>
>
> 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/
> http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
>
>
> 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.
>
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> NOTICE: This message contains information which is confidential and the
> copyright of our company or a third party. If you are not the intended
> recipient of this message please delete it and destroy all copies. If you
> are the intended recipient of this message you should not disclose or
> distribute this message to third parties without the consent of our company.
> Our company does not represent, warrant and/or guarantee that the integrity
> of this message has been maintained nor that the communication is free of
> virus, interception or interference. The liability of our company is limited
> by our General Conditions of Services.
> Nota : Ce message contient des informations confidentielles propriété de
> notre société et/ou d'un tiers. Si vous n'êtes pas parmi les destinataires
> désignés de ce message, merci de l'effacer ainsi que toutes ses copies. Si
> vous êtes parmi les destinataires désignés de ce message, prière de ne pas
> le divulguer ni de le transmettre à des tiers sans l'accord de notre
> société. Notre société ne peut garantir que l'intégrité de ce message a été
> préservée ni que la présente communication est sans virus, interception ou
> interférence. La responsabilité de notre société est limitée par nos
> Conditions Générales de Services.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> --
> 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
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> http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
>
> 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/
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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.
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