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That's incorrect. Your austenitic stainlesses are soft (mostly), like food service shelves and countertops, and stuff like 304, 318, 416, etc. Austenitic steels are not hardenable by heat treating. ...

There are a couple ways. First, see if it says "stainless" anywhere on the blade. Manufacturers will advertise the fact that their blade is stainless. You'll see something on there that says...