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Is stainless steel magnetic?

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2022-08-12 09:44

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Generally speaking, stainless steel is austenite and is not magnetic. But martensite and ferrite are magnetic, but austenite can also be magnetic. There are two reasons for this:
During solidification, some magnetism will remain due to some smelting reasons. For example, 304 will remain 3-8%, which is a normal phenomenon, so austenite should be non-magnetic or weakly magnetic.
Austenitic stainless steel is non-magnetic, but after cold work hardening, the γ phase will partially generate martensitic transformation and become magnetic. Heat treatment can be used to eliminate this martensite structure and restore its non-magnetic properties.

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