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Questions about Stainless

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I have no experience machining stainless steel and I need to make a small part from stainless that will be as high strength (tensile) as possible, with high hardness and a very smooth finish.  I searched on-line and have settled on 440.  I intend to machine the annealed form, then harden, then polish.  (make sense?)  I read that 400F is easier to machine than 440C, yet the calculator gives me the same speeds/feeds for 440C (annealed) and 440F (annealed).  Does this make sense?  I would have thought that the “easier to machine” alloy would have higher feeds/speeds?

Thanks.

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