Skip to main content

[MW:7175] MW:7170- Re: Delta ferrite Drg

By Materials & Welding

Mr Hegde,

 

There’s nothing called delta ferrite drawing. There are phase diagrams showing the formation of delta ferrite and constitutional weld metal solidification diagrams for austenitic stainless steels, predicting ferrite in weld, e.g. shaffler, Delong diagram and WRC Ferrite No diagram..

 

The attached file is an extract from a literature of welding institute. I’ve attached some notes on this.

 

Feel free to read and you may discuss with your client also.

 

Thanks.

 

Pradip Goswami,P.Eng.

Welding & Metallurgical Engineer/Specialist.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of s. karthik
Sent: Thursday, September 23, 2010 5:58 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:7170] RE: 7151] Re: Delta ferrite Drg

 

Hi,

Delta Ferrite Drawing is a diagram predicting Ferrite content in Stainless steels.You can measure the ferrite content by many of the method by NDE.If you are not having such facilities you can ask NDE company to measure the Ferrite Number and the will give you the result with Delta ferrite diagram(Chromium equivalent vs nickel equivalent).you can see the sample file attached with this.

Ferrite number is a measure of Chromium & Nickel equivalent in an Austenitic stainless steel material.Normally client wants to make sure the FN in Austenitic welds which has exceed or not.

 

Thanks & Regards,

(Karthik)

On Thu, Sep 23, 2010 at 10:50 AM, PB HEGDE <hegde.pb@isgec.com> wrote:

Dear Mr Herman Pieper
Client wants specifically "Delta Ferrite Drawing" Which I could not
understand
Regards

Hegde P.B.

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of hpi001
Sent: Wednesday, September 22, 2010 9:23 PM
To: Materials & Welding
Subject: [MW:7151] Re: Delta ferrite Drg

Dear Mr. Hedge,

I assume that they mean the delta ferrite skeleton in weld connections
of Austenitic Stainless Steels. You need a minimum of 2 - 6 % Delta
Ferrite in order to avoid hot cracks. By way of the ferrite skeleton
in the weld metal you can show that this is present (continue skeleton
instead of a under broken skeleton). I hope you understand what I
meant because I don't now exactly how to put this in English.

Best Regards,


Herman Pieper

On 22 sep, 13:19, "PB HEGDE" <hegde...@isgec.com> wrote:
> Dear friends
>
> Request to share information about " Delta ferrite Drawing " which is
asked
> by one of our client i.e. what is the meaning of Delta Ferrite Drawing ?
>
> Regards
>
> Hegde P.B.

--
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.

--
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.

 

--
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.

THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

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