Is 304 Stainless Steel Magnetic?
In its annealed (fully heat-treated) state, 304 stainless steel is generally non-magnetic because it has an austenitic crystal structure.
However, after cold working (like bending, stamping, or welding), it can become slightly magnetic due to the formation of some martensitic phase.
Why?
304 stainless steel is an austenitic stainless steel, which is face-centered cubic (FCC) in structure, making it non-magnetic.
Cold deformation can cause some austenite to transform into martensite (body-centered cubic or tetragonal), which is magnetic.
Application Types Related to Magnetic Properties:
Non-magnetic requirements:
Medical equipment (MRI rooms, surgical instruments)
Electronic enclosures and devices
Food processing where magnetism can affect processes
Where slight magnetism is acceptable:
Kitchen sinks, appliances
Architectural panels and trim
Automotive components
