Abrasion resistance weld for 2.25Cr-1Mo Valve Bonnet

[harith07]

Hi there,

I've got steam letdown valve ofwhich the bonnet is made of 2.25Cr -1Mo.
The internal of the bonnet has scouring marks due to the piston ring rubbing against the inside of the bonnet.
Will Ni Cr 3 (Inco 82) weld rod be a suitable material to be used for the repair (to resist further abrasion)?
How do I confirm this?

Thanks.

 

[weldstan]

Probably not. There are a number of hard surfacing materials and application methods that you could use to effect the repair.

 

[metengr]

If the piston ring is of harder material in comparison to the valve bonnet, using Inconel will not work. You should consider the following; weld repair the region on the bonnet using Inconel followed by a layer of Stellite 21 hardfacing over the Inconel. The only word of caution is that the piston ring may begin to wear against the Stellite 21 hardfacing.