Stellite overlay on duplex stainless

[andyenergy]

Hi all, I'm in need of a bit of advice.

We recently received a component made from ASTM A890 Gr5A duplex stainless. This was overlayed with stellite 6 at a location that one would expect to be overlayed. Initial looks at the overlay suggests that the stellite hadn't bonded with parent at all.

I know that stellite can be a bit difficult to deposit and the method of deposition can have a significant influence on the overlay cracking. One thing that has got me a bit curious is the comments made by the supplier.

Problems with depositing stellite on this particular alloy have been noted (I've failed to find any evidence of this in my searches as yet) and that a known solution is to use a different grade of (duplex stainless) base material.

I'm not sure why simply changing the grade of base material would make a difference. Any thoughts/experiences with stelliting stainless steels?

Many thanks

Andy

 

[chtimi]

I have a experience about overlay on superduplex as 5A or 6A.
We have used a qualified process with a first lay of inconel and stellite on this lay of inconel.
In the same time , it seems that some other manufacturers have not particulary problem to use directly sellite 12 or 6 on duplex.

Jluc.