[MW:14724] carburization of furnace tubes

Dear friends,

we recently changed the ethane furnace tubes after service in 4 years,
now we are planning to segregate the healthy tubes & return bends
from used/removed lot to re-use in future if needed. Material of the
tube/bend is 25Cr/35Ni/Nb+Micro.

We can check visually for cracks, thinning, bowing etc. UT is not
feasible, because there is some sort of rough coating over it.

How about the field metallography for carburization?

thanks a lot to all dear friends.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.