Nella is a foodservic equipment supplier, based here in Toronto. They do indeed rent and sharpen knives. They rebrand Italian Sanelli knives as Nella Cutlery, these are very soft 54rc knives and I can't find out any information about the steel used at all....
Just FYI, I do have a Sanelli knife (though not a Nella) and the steel says X60 CR MO V 14. Correct me if I am wrong, but the X60 means it is .6 percent carbon, probably 13 percent chromium, and the rest molybdenum and vanadium. The X60 is actually a higher carbon content than other production knives.
There is a cult of ignorance in the United States...nurtured by the false notion that democracy means that “my ignorance is just as good as your knowledge.” -- Isaac Asimov