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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