Skip to main content

[MW:2756] Re: 2729] Ferrite Number (FN) for the deposited weld metal

By Materials & Welding
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: materials-welding@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: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of tong tong
>Sent: Sunday, July 19, 2009 11:01 PM
>To: materials-welding@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
>>
>

PREM S NAUTIYAL

CELL : 9820313278
--~--~---------~--~----~------------~-------~--~----~
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/
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.
-~----------~----~----~----~------~----~------~--~---

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more