It’s a marketing gimmick, Timmy. “There are over 150 grades of stainless steel, of which 15 are most commonly used.” It’s all dependent upon how much of the element nickel is in the mix. Nickel is what determines if the grade that you are looking at is magnetic or not.(per the internet. When I was working on a environmental spill response crew, I was told it was the amount of chromium in the mix).
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