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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