Hello all, I tried this in the military forum and got pointed here.
I have a long shot question. I would be grateful for any help anyone can give.
I am looking for information on what sort of finish options were being used by Rolls in the early '50s for jet engine parts made of inconel. In particular for Derwent mk 9 balance pipes.
The examples I've seen show three different finishes: a machine finish, a sort of bead-blasted satin look as on the examples on the right here, and a very matte almost velvety look as on the left. Although they have a hint of bronze color in the photo, in person they just look a warm grey.
Thanks!