ASME Sec 1, PW39 P15e Note 2, if Filler metal chromium content is less than 3%On Mon, Apr 8, 2013 at 8:08 PM, John Henning <jhenning@deltak.com> wrote:
--I am not sure what Code you are working to. ASME Section I, Section VIII, and B31.1 would all allow heat treatment of joint you suggest at a minimum temperature of 705°C (1300°F) if the filler metal had less than 3%Cr, was nickel based, or austenitic*. The maximum temperature would determined by lower critical temperature for the P3 material (approximately 730°C (1350°F) per B31.1 Table 129.3.1). This would give you a fairly narrow window of 705°C to 730°C. I believe the rational is that the permissible operating temperature for the P3 material is low enough that there is no challenge to the 91 material (i.e. well below the creep range for P15E).
However, in general I would recommend welding in a pup piece of either P5a or P4, heat treat according to the requirements of P15E. Then the P3 material would be welded to the pup piece and heat treated to the requirements of the pup piece material.
*See:
Section VIII, Div. 1, UCS 56 Note 2 to P15E
See Section I, PW-39-5 Note 2
See B31.1 Table 132 Note 2 to P15E
Hope this helps.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Binoy Soman
Sent: Monday, April 08, 2013 3:15 AM
To: materials-welding@googlegroups.com
Subject: [MW:17309] PWHT for P15E to P3
Dear experts,
Kindly explain about PWHT requirement while welding two materials among which one require PWHT by code and other does not (Eg; P15E to P3 materials).
What should be the cycle that must be followed, Is it the same that of P 15E to P 15E?. Considering the lower critical temperature of P3 material , I select 700-730°C temperature range for PWHT of P15E to P3 (correct me if I am wrong).
P15E to P15E PWHT cycle that we are following is attached.
S.Binoy
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