Spanish to English Tech/Engineering Materials (Plastics, Ceramics, etc.) from a quality report

OK, my initial thought was that there was a spelling mistake, however, after searching on Google, it did come up several times with respect to metals. Could it mean polished or finished or is it just a spelling mistake?

Here is the context (not much)
(on a quality report):

10 piezas relizadas en AISI 303 en vez de xxxxxx