Thursday, October 24, 2013

Re: [MW:19065] RE: 19056] -40F (-40C) impact qualification of 1-1/4Cr 1/2Mo (P4)

Dear Mr Goswami

do you have encountered any such case (where atm temp are very low),  few of the Russian region projects where amb temp is colder than -45 °C. LAS being primarly used for high temp service. 



On 24 October 2013 07:36, pgoswami <pgoswami@quickclic.net> wrote:
John,
 
To the best of my knowledge , very few mills would commit impact @ -40F (-40C) for this grade of steel unless there's a very specific requirement and the necessary technical query.  It's very difficult to meet  such requirement with a consistency.  Same applies for welding consumable  also. 
 
API -934C/E (if applicable) enforces temper embrittlement factors, however the impact is never called for at such low temperature.
 
I would say ask few good mills, what's best achievable for this steels and then go from there.
 
Best Regards.
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
 
 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of jhenning@deltak.com
Sent: Wednesday, October 23, 2013 4:57 PM
To: materials-welding@googlegroups.com
Subject: [MW:19056] -40F (-40C) impact qualification of 1-1/4Cr 1/2Mo (P4)

I have a customer requiring -40F (-40C) impact qualification for 1-1/4Cr 1/2Mo material (ASME Sc IX).  Design and fabrication is required to be in accordance with ASME Sc. VIII, Division 1.  Weld thickness is approximately 1-3/4 in. (45mm).  It is anticipated that only SAW and SMAW will be required.  While I have a number of procedures qualified at -20F (-29C) it would appear that they are approaching the DBTT for the weld metal and HAZ in most instances.  I would like to know if anyone has qualified 1-1/4Cr 1/2Mo to -40 and what special measures were taken to achieve it;  i.e special filler metal requirements or specific filler metal employed, special weld techniques or parameter restrictions, etc.  Materials are SA-387 Grade 11 Class 2 and SA-182 F11 Class 2.

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