Answer: the most commonly magnetic stainless steel types are Ferritic stainless steels (409, 430 and 439) & Martensitic stainless steels (410, 420 and 440) [1]. These stainless steels are magnetic due to their iron-rich composition and specific crystal structure [2].

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Source:
[1] https://www.thyssenkrupp-materials.co.uk/is-stainless-steel-magnetic
[2] https://www.fushunspecialsteel.com/which-types-of-stainless-steel-are-magnetic/