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,IWEWelding & Metallurgical SpecialistOntario, 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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