[MW:28468] Re: WELDING P11 WITH P91 STEEL

interesting query. Thanks for sharing.

The first think, why you need P11 to P91 joint? certainly you are going to have inferior properties on P11 side, so joint should withstand the P11 properties which can be achieved using welding with E8018-B2.

Now, while the recommended PWHT temp for P11 is 690 ± 15°C, its 740 ± 15°C for P91 material.

So, ideally a preheat temp of 200 to 250°C followed with a PWHT at 715 °C for longer duration shall be helpful to SR and controlled hardness values.

To me, point 1 suits more. however point 2 & 3 could be case specific and are the possible solutions.

Thanks & regards

Sandeep Kumar

On Friday, October 19, 2018 at 1:57:35 PM UTC+3, DDN VERMA wrote:

Dear Sirs,

I read several methods to join a P11 [1.25 Cr- 1/2 Mo] pipe to P91 [9Cr - 1 Mo] pipe, such as :

1. Weld using filler metal corresponding to corresponding to [2-1/4Cr - 1Mo] steel & post weld heat treat at appropriate temp..

2. Butter P91 with  filler corresponding to  [2-1/4Cr - 1Mo], post weld heat treat & weld with P11 & re-post weld heat treat it.

3. Use a P22 pup piece to join P11 with P91, etc. etc.....  

However, I wish to know, which is the most appropriate method taking into considerations the overall weld-integrity and high temperature strength of the weldment.

Please help to clarify my doubts.

THANKS,

DDN VERMA

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