asme welding G-X45NiCrNbTi35-25 to P8

[samvanwesen]

Dear,
Does anyone have experience with G-X45NiCrNbTi35-25 or maunarite xm?
I have found reformer tubes made out of G-X45NiCrNbTi35-25. I am curious to weld small (20x20x2mm) pads of Thermocouples (SS310, P8) on top of this pipe (FW).
Is there a trick to find a P number for this material? As I am trying to find a suitable PQR covering this weld. I assume no PWHT is needed.

curious to your experience with this kind of superalloy?

Sam

 

[metengr]

This material has no ASME base metal P-No assigned to it. You can still qualify a WPS per ASME Section IX using the material grade under base metal in the WPS/PQR to P-No 8 base material.

 

[pradipgoswami]

G-X45NiCrNbTi35-25 or maunarite xm are cast austenitic alloys. Coarse grain size together with poor ductility could be common factors. One has to weld carefully with controlled heat input.

To the best of my knowledge , metrode or Bohler(Thermanit)have matching electrodes to this alloy. Other options would be to select Special Metals product. Irrespective of the product the above factors are common to all welds.

These alloys are not assigned with P No. Hence qualification has to be on the exact grade.Substitutions are normally NOT allowed.

The following document provides the basic guidance.

http://netlite.com.my/home/wp-content/uploads/2011/11/A171_A172.pdf

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[samvanwesen]

Thanks guys
Great answers.

I am happy not to be able to supply a PQR.

Maybe next project.

Sam

 

[weldstan]

Whereas this material is primarily used in fired heaters, you should review API-560.

 

[weldstan]

I have qualified 310 SS to the alloy with the GTAW process using both ERNiCrCoMo-1 and ERNiCrMo-3 to both the previous B31.3 bend criteria and the current ASME IX bend criteria. Because you only intend to fillet weld the pads to the tube, you will only need a fillet weld PQR. You should not have a problem but remember, cleanliness,cleanliness!