Search:

here is one that looks like tamahagne but the first kanji is not quite the same so it is unclear to me if it the real deal or not:

hopefully someone that knows Japanese will chime in and clear that up.

here is how tamahagane kanji looks like

87929

the kanji you have does not look like tamahagane to me.

You can see how it looks on a bunch of Iwasakis here
Kanji Help..slightly off topic...

I do not see tamahagane in the kangi, the first kanji is there the second is not clear as far as I can tell.