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Old 09-18-2007, 05:33 AM
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mete mete is offline
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Join Date: Sep 2004
Location: NY State
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303 is the free machining grade of 304 and 416 is the free machining grade of 410. Free machining in these two cases means higher sulphur content. With sulphur incusions [manganese sulphide] you might not get a perfect mirror finish when polishing. Machineability of 410 is better than 304 as 304 is "gummy" as machinists call it. I would guess that most use 416 in the un heat treated form.
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