Ferrite Number (FN) for the deposited weld metal

[tong tong]

Dear All,

Regarding above mentioned subject, i would like to know in detail about ferrite number. I have a few questions to ask such as What is the ferrite number? Why it is so important? Materials subjected to ferrite number? Permissible limit of ferrite number? Code and standard that we refer to requirement of ferrite number? Procedure to perform ferrite number?..If anybody have experience or information regarding this subject hopefully you can share with me. Thank in advance for your kind cooperation


Regards
tong2

[PB HEGDE]

 

 

Austenetic SS used in chemical /petrochemical plant require  good Corrosion resistance. For which delta ferrite plays the major role.

i)Increase in Delta Ferrite will reduce the corrosion resistance . Therefore in severe corrosion resistance requirement  , ferrite to be kept below 8% (Generally it is kept between  3-7 %)However  very low ferrite  causes defect like hot crack, fissures ,There is no code requirement but Ferrite requirement is decided by process licenser ,depending upon the service condition

ii)You can check ferrite No by Instrument called Ferrite Meter where you can get Ferrite No directly ,Some time You can check with respect to Delong Diagram ( Given in ASME Sec 2C ) by calculating /plotting the Cr , and Ni equivalent from actual chemical analysis of weld  

iii)My experience –some time Ferrite no increases due to work hardening of material If you measure by Ferrite meter

Regards

 

Hegde P.B.

09714714803

[Luis Albanes]

It helps you know the weldability of your material, you can find out more in AWS D1.1 Luis Albanés --- El dom 19-jul-09, tong tong <ton...@gmail.com> escribió:

De:: tong tong <ton...@gmail.com> Asunto: [MW:2729] Ferrite Number (FN) for the deposited weld metal A: material...@googlegroups.com Fecha: domingo 19 de julio de 2009, 23:00

Dear All, Regarding above mentioned subject, i would like to know in detail about ferrite number. I have a few questions to ask such as What is the ferrite number? Why it is so important? Materials subjected to ferrite number? Permissible limit of ferrite number? Code and standard that we refer to requirement of ferrite number? Procedure to perform ferrite number?..If anybody have experience or information regarding this subject hopefully you can share with me. Thank in advance for your kind cooperation Regards tong2

¡Obtén la mejor experiencia en la web! Descarga gratis el nuevo Internet Explorer 8.br> http://downloads.yahoo.com/ieak8/?l=mx

[PREMSHANKARDUTTNAUTIYAL]

Hi

Please refer attached pdf file for details on ferrite number.
Also please go through ASME Sec II-C SFA 5.4, 2007 edition, page number:92 for details on ferrite number.

Regards

Prem Nautiyal
Godrej, Mumbai.

On Tue, 21 Jul 2009 08:03:17 +0530 wrote

>Dear All,
>
>Regarding above mentioned subject, i would like to know in detail about
>ferrite number. I have a few questions to ask such as What is the ferrite
>number? Why it is so important? Materials subjected to ferrite number?
>Permissible limit of ferrite number? Code and standard that we refer to
>requirement of ferrite number? Procedure to perform ferrite number?..If
>anybody have experience or information regarding this subject hopefully you
>can share with me. Thank in advance for your kind cooperation
>
>
>Regards
>tong2
>
>>
>

PREM S NAUTIYAL

CELL : 9820313278

[John Henning]

Tong2

 

Attached is a portion of a very old booklet provided by Stoody Corporation.  The information is very basic but it is the one place I could quickly put my hands on a comparison of Ferrite Number and % Ferrite (volume %).  Look at the Delong diagram and you can see the lines expressed as both ferrite number and % ferrite.

 

Any standard welding text book that discusses welding of austenitic stainless steels should have a discussion on ferrite, effects (both good and bad), and how to measure or estimate ferrite.  Estimating ferrite can be done with Sheffler Diagram (oldest), Delong Diagran (modified Sheffler), and WRC ferrite diagram (currently in vogue).  If you can get your hands on it, there is a good discussion of welding of stainless steels in the AWS Welding Handbook, Volume 4, Materials and Applications Part 2.  As the AWS Handbook is copyright material, I do not feel confortable copying it and sending out.

 

Please review the above and if you have specific questions please ask.

 

John

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of tong tong

Sent: Sunday, July 19, 2009 11:01 PM
To: material...@googlegroups.com
Subject: [MW:2729] Ferrite Number (FN) for the deposited weld metal

[Luis Albanes]

John Is ferrite number also aplied for plain carbon steel weldability? Thanks Luis Albanés --- El mar 21-jul-09, John Henning <jhen...@deltak.com> escribió:

[PREMSHANKARDUTTNAUTIYAL]

Hello Luis

Ferrite number is NOT applicable to Plain Carbon steels weldability.

Ferrite number is determined from the WRC 1992 diagram by calculating the Chromium equivalent and Nickel equivalent.

Till date i have seen the requirement of Ferrite in austenitic stainless steels and duplex stainless steels only.

Regards

Prem Nautiyal
Godrej,Mumbai.

On Wed, 22 Jul 2009 08:21:43 +0530 wrote

>John
>Is ferrite number also aplied for plain carbon steel weldability?
>Thanks

>Luis Albans
>
>
>--- El mar 21-jul-09, John Henning escribi:

>
>
>De:: John Henning
>Asunto: [MW:2745] RE: 2729] Ferrite Number (FN) for the deposited weld metal
>A: material...@googlegroups.com
>Fecha: martes 21 de julio de 2009, 8:45
>
>
>
>Tong2
>
>Attached is a portion of a very old booklet provided by Stoody Corporation.  The information is very basic but it is the one place I could quickly put my hands on a comparison of Ferrite Number and % Ferrite (volume %).  Look at the Delong diagram and you can see the lines expressed as both ferrite number and % ferrite.
>
>Any standard welding text book that discusses welding of austenitic stainless steels should have a discussion on ferrite, effects (both good and bad), and how to measure or estimate ferrite.  Estimating ferrite can be done with Sheffler Diagram (oldest), Delong Diagran (modified Sheffler), and WRC ferrite diagram (currently in vogue).  If you can get your hands on it, there is a good discussion of welding of stainless steels in the AWS Welding Handbook, Volume 4, Materials and Applications Part 2.  As the AWS Handbook is copyright material, I do not feel confortable copying it and sending out.
>
>Please review the above and if you have specific questions please ask.
>
>John
>
>
>

>From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of tong tong
>Sent: Sunday, July 19, 2009 11:01 PM
>To: material...@googlegroups.com
>Subject: [MW:2729] Ferrite Number (FN) for the deposited weld metal
>
>
>Dear All,
>
>Regarding above mentioned subject, i would like to know in detail about ferrite number. I have a few questions to ask such as What is the ferrite number? Why it is so important? Materials subjected to ferrite number? Permissible limit of ferrite number? Code and standard that we refer to requirement of ferrite number? Procedure to perform ferrite number?..If anybody have experience or information regarding this subject hopefully you can share with me. Thank in advance for your kind cooperation
>
>
>Regards
>tong2
>
>
>
>
>

>      Obtn la mejor experiencia en la web! Descarga gratis el nuevo Internet Explorer 8. http://downloads.yahoo.com/ieak8/?l=mx

[Luis Albanes]

Dear  Nautiyal Thank you for the explanation, we hava had cracks in our prooject recently also, but as I said before it seems it ws due to man error at the clkeanig stage of root pass Regards Luis Albanés --- El mar 21-jul-09, PREMSHANKARDUTTNAUTIYAL <prem_n...@rediffmail.com> escribió:

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[Agrawal Sunil (Mumbai -Stequ)]

Please refer to attached files. It may be useful info.

 

Best Regards,

Sunil Agrawal/ Tecnimont ICB

---

</Table

 

[Mrityunjay Kumar / ZS Saudi PEB QA/QC]

Hi,

Good morning,

Can anybody tell me the formulae for Torque calculation (if load & area is provided for Anchor Bolts).

 

 

 Thanks and Regards,

M.K.Choudhary

-------------------------------------------------------------------------------------------------------- Disclaimer: This email and any files transmitted with it are confidential and intended solely for the use of the addressee(s) named herein. If you are not the intended recipient or addressee, you should not use, disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of "Zamil Industrial" and or its units. Warning: Although reasonable precautions have been taken to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments. If you have received this electronic mail message in error, please contact the sender directly.

[Ramprasad Chari]

Torque,in lb.ft=KDP/12

 

K=0.2 for finished bolts;0.22 for Zn Plated;0.3 for black;0.16 for Cd plated;0.15 to 0.18 for lubricated;0.10 for highly lubricated or waxed

D=nominal dia of bolt in inches

P=Bolt's desired load in Lbs(=75% of YSXArea)

A,area=0.7854X Square of (D - 0.9743/n)

n=no of threads pre inch;

Coarse series(UNC) 1/2=13

                              5/8=11

                              3/4=10

                              7/8=09

8UN series 1" onwards=8

Hope above information shall help

Regards

Aarpee

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