may be stainless steel

may be silver, titanium, iridium, ruthenium, rhenium, tantalum, niobium, hafnium, osmium, or rhodium

I would suggest a high carbon steel/a case hardened steel.

You should start seeing decarburization of the surface which is relevant to both environments where this material is sued, as well as noval steel process methods such as solid decarburization in the S3 process, as well as people beginning to look at high temperature interaction with nitrogen based gases.

THANKS