Re: [MW:19062] -40F (-40C) impact qualification of 1-1/4Cr 1/2Mo (P4)

Hi!

Generally I had also experience and observed that P4 SA387Gr 11 cl2 is recomended to use up to minus 29C  even API 934 D also refer the same temp.

Regards

Hegde P.B. 

From: "jhenning@deltak.com" <jhenning@deltak.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 24 October 2013 2:27 AM
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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