Actually, all of the better austenitic grades of stainless steel are non-magnetic... and austenitic grades of stainless steel are better than martenistic for marine use.
There is bad stainless steel that is non-magnetic, but it is certainly not very common. A magnet remains the easiest, fastest and cheapest way to tell the better grades from the lesser ones as a general rule.
MOST good stainless steel is non-magnetic.
Good quality stainless steel cutting blades are sometimes magnetic.
All non-magnetic stainless steel is not necessarily good.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.