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300 series stainless is basically the same.I work in the metalworking industry,if i were to hand you a piece of 302(18-8) and a piece of 304 unless you looked under a microscope at a cross section you wouldn't notice any difference.316 is much harder due to both a higher nickel content and processing,all wire is drawn to size from a larger diameter so if you draw .312 18-8 down to .100 it'll be hard as a rock due to the density of the drawn material.Most of the hardware store wire is drawn from wire thats within .020" of the finish diameter so the difference beetween 302,304,308 is minimal.
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