RE: FW: [MW:5304] group of SA517

Dear Ali,

 

I have attached a comprehensive guideline from ISG (Now Arcelor) for your reference. You need to work out a full fabrication (including forming) and welding/PWHT guidelines  so as to handle Q&T steels successfully. 

 

Typically SA 517  grade steels would require some degree (100-150 deg C max) of preheating for successful thermal cutting depending on the thickness.Following cutting the kerf and cutting burrs shall be smoothly ground to remove all serrations. LPI or MPI shall be done on all cut weld bevels.

 

While forming the dished heads, some form of warm forming typically below the  code recommended PWHT temperature would always be advisable. If  forming method is hot forming them heads should  preferably be subject to Q&T operations again. You may need to contact and discuss this aspect with the steel mill, before proceeding with forming and other fabrication aspects.

 

Typically welding electrodes would be E-10018/11018M or matching GTAW/SAW consumables. SAW shall be done with extreme control on welding heat input.

 

The attached document is quite detailed, please read though and feel free to raise any queries.

 

Thanks.

 

Pradip Goswami,P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-P.Goswami@sympatico.ca,

pgoswami@quickclic.net

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ali asghari
Sent: Friday, May 28, 2010 12:09 AM
To: materials-welding@googlegroups.com
Subject: Re: FW: [MW:5280] group of SA517

Dear Goswami

Thank you for useful information.

I work in a fabrication pressure vessels project, that used from SA517 gradeB,F.

unfortunatly in most cases during prepration of joints, some cracks in base metal founded.how can dealing with them?

do you have infrormations about forming methods of shell & head? or in which documents can i found?

regards

On Thu, May 27, 2010 at 3:02 AM, <pgoswami@sympatico.ca> wrote:

Dear Ali,

 

SA- 517 is a high strength quenched and tempered steel, which comes in  6 grades, Grade A, B, E, F, J, P. You may find all the details in ASME Sec-II, Part-A.

 

Coming back to this steel, it is :-

·         Quenched—to refine the grain, to enhance the UTS. Talk about any alloying element, Cr, Mo, Ti, V, Bo Nb/Cb, you’ll have in this steel. This steel have very little ductility in as quenched condition

·         Tempering – to enhance the ductility(% El), to enhance the notch toughness, reduce the hardness.

 

A combination of both the above heat treatments provides a balanced mechanical properties in this steel. This answers point1 of your query.

 

ASME Sec VIII, DIV-1,UCS-66, does not deal with this steel, UCS chapter is for carbon and low alloy steel only .

 

SA-517 is covered in great details under UHT. There is no exemption for impact test on this steel. Welding of SA-517, as like any other Q&T steel requires a great control and precautions on welding.

 

Where are you thinking of using this steel? Let me know if you require further details.

 

Thanks.

 

 

Pradip Goswami,P.Eng

Senior Engineer/Specialist(Welding-Metallurgy)

ONTARIO POWER GENERATION Inc.

Email- pgoswami@quickclic.net, pgoswami@sympatico.ca.

 

 

From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Wednesday, May 26, 2010 2:31 PM
To: GOSWAMI Pradip -THERMAL
Subject: FW: [MW:5263] gorup of SA517

 

 

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Date: Wed, 26 May 2010 21:44:19 +0530
From: rutvikdixit@yahoo.co.in
Subject: Re: [MW:5263] gorup of SA517
To: materials-welding@googlegroups.com

Dear Ali, for your point no. 1, I would like to say due to quenching in oil/water after heating the object to the required temp, the cooling rate will be very faster, so grain size will be less. In this case hardness and brittleness also increases, so to get toughness in the material we need to carry out tempering. With Regards, Rutvik Sr.Surveyor TATA Projects Ltd. --- On Wed, 26/5/10, Ali Asghari <asghariali@rocketmail.com> wrote: From: Ali Asghari <asghariali@rocketmail.com> Subject: [MW:5257] gorup of SA517 To: materials-welding@googlegroups.com Date: Wednesday, 26 May, 2010, 4:32 PM Dear All 1-is Quenching & Tempering a process of grain refining? 2-SA 517 belong to curve A or B in UCS 66? REGARDS   -- 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.

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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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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.