Saturday, October 26, 2013

Re: [MW:19078] -40F (-40C) impact qualification of 1-1/4Cr 1/2Mo (P4)

Its true!! You shall verify ASTM A333, this standard is similar to ASTM A335 but in low temperature conditions.


2013/10/23 ramón ignacio briceño <bricenori@hotmail.com>
Sorry, the material design temperature of the 1-1/4Cr 1/2Mo (P4) limit between -20°F to 1000°F  and not is designed to work to -40 °F. Remember this low alloy steel is selectionated to systems that driver high temperature service because the principal alloying elements are Cr and Mo, so this low alloy steel have resistance to the oxidation and creep. Use it in low temperature like -40°F  not is good idea, it prone to fragil fracture during the impact testing.  

Sincerely,
Ramon Briceno
Metallurgical Engineer.

Date: Wed, 23 Oct 2013 13:57:13 -0700
From: jhenning@deltak.com
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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