The most commonly non-magnetic stainless steel type is austenitic stainless steel, particularly the 300 series, such as 304 and 316. [1] These steels are non-magnetic due to their low nickel content and high carbon levels, which contribute to their non-ferromagnetic properties. [2]

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Source:
[1] https://www.fushunspecialsteel.com/which-types-of-stainless-steel-are-magnetic/
[2] https://www.tuofa-cncmachining.com/tuofa-blog/is-steel-magnetic.html