F91 vs F9 grade flanges

[hrish...@gmail.com]

Hi

I have some LA flanges certified as F9 grade as per MTC and TPI certificate. But when I conducted PMI using NITON-XRF machine I have observed presence of Vanadium slightly lower than F91 requirements in some of them.
My query is

If it is of F9 why there is Vanadium presence?

Can I accept it as F9 grade?

Thanks
Hrishi
Sent on my BlackBerry® from Vodafone Essar

[jignes...@linde-le.com]

Dear Hrishi,

Can you share PMI results ?

What was the referent standard used  ?

Please inform end application of the product also.

With Best Regards,

Jignesh R Rana
Manager - QA & QC

Linde Engineering India Pvt. Ltd.
38, Nutan Bharat Society, Alkapuri, Vadodara 390007, India
Tel.: +91 265 3056789, Fax: +91 265 2335213 , Mobil:  +91 90999 86019
jignes...@linde-le.com, www.linde-india.com

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hrish...@gmail.com Sent by: material...@googlegroups.com 11-08-10 05:18 Please respond to material...@googlegroups.com

To material...@googlegroups.com cc Subject [MW:6435] F91 vs F9 grade flanges

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[Bathula Raghuram (Mumbai - PIPING)]

Did you get Cb too in PMI?
In that case i suggest to go for a sample wet analysis

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of jignes...@Linde-LE.com
Sent: Wednesday, August 11, 2010 4:37 PM
To: material...@googlegroups.com
Subject: Re: [MW:6438] F91 vs F9 grade flanges

[K.M Hrishikesan]

Dear Raghuram & Jignesg Rana

 

• The PMI result is as follows:  Cr-8.66%, Mo-0.96% and V-0.19%
• There is no Cb content
• Intended service of the line is Coke Drum Overhead vapour and Coke drum Blow down vapour line.

 

Regards

Hrishi

 

 

[pgoswami]

Hrishi,

 

Pleas see the extract from SA182,FYI info. I think your supplier got caught between F91 and F9 specification. V to the level of 0.19% can affect weldability significantly. Advice would be to perform a wet chemical analysis on the flanges,if the results are consistent with the test certificate then take the matter with client and seek their concurrence.

 

The supplied material look to be closer to the chemistry of of 91 steel.If so please note that a change from F9 to F91could be quite significant.

 

Thanks.

 

Pradip Goswami,P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-pgoswami@sympatico.ca,

pgos...@quickclic.net

 

 

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 From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of K.M Hrishikesan
Sent: Wednesday, August 11, 2010 10:09 AM
To: material...@googlegroups.com

[hrish...@gmail.com]

Thanks pradeep

In this circumstance could you please elaborate on the extra precautions to be taken during welding?

Regards

Hrishi

Sent on my BlackBerry® from Vodafone Essar

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From: "pgoswami" <pgos...@quickclic.net>

Sender: material...@googlegroups.com

Date: Wed, 11 Aug 2010 13:39:29 -0400

To: <material...@googlegroups.com>

ReplyTo: material...@googlegroups.com

Subject: [MW:6449] MW:6444- F91 vs F9 grade flanges