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Why is 304 stainless steel weakly magnetic

304 stainless steel is austenitic stainless steel, but why does it contain a small amount of martensite or ferrite?

In smelting or forging, composition segregation or improper heat treatment will cause 304 stainless steel to contain a small amount of martensite or ferrite structure. As a result, 304 stainless steel will be weakly magnetic.

In addition, after cold working of 304 stainless steel, its structure will also be transformed into martensitic stainless steel. The greater the deformation degree of cold working, the more martensitic transformation, and the greater the magnetic properties of 304 stainless steel.

For example, the original non-magnetic 304 stainless steel plate has become magnetic during the cold drawing process of the water tank. The most obvious position in the water tank is the corner part, that is, the part with the largest deformation.

In order to completely eliminate the magnetic properties of the 304 stainless steel plate caused by the above reasons, the austenite structure can be restored by high-temperature solution treatment, that is, the martensite or ferrite is transformed into austenite, thereby eliminating the magnetic properties.

It should be clearly pointed out that it is a normal phenomenon for 304 stainless steel to generate magnetism due to the above reasons.