How to demagnetize 304 stainless steel plate

Generally speaking, the austenitic 304 stainless steel plate material is non-magnetic or weakly magnetic. However, magnetism may also occur due to fluctuations in chemical composition caused by smelting or different processing conditions. If you want to completely eliminate the magnetism of 304 stainless steel plate, you can The stable austenite structure is restored through high-temperature solution treatment, thereby eliminating magnetism.

The meaning of 304 stainless steel plate: The carbon content of 304 stainless steel plate is much smaller than that of ordinary 304 stainless steel plate. The main chemical components are: C: ≤0.08, Si: ≤1.0, Mn: ≤2.0, Cr: 18.0~ 20.0, Ni:8.0~10.5, S:≤0.03, P:≤0.035, N≤0.1.

The reason why 304 stainless steel plates produce magnetism: In real life, stainless steel plates are not non-magnetic. For example, the most commonly used 304 stainless steel plates will also produce varying degrees of magnetism after cold processing; expressed in professional terms of physics: : The magnetism produced by the 304 stainless steel plate comes from the structure of electron spin, which is a quantum mechanical property. In addition, after cold working of the 304 stainless steel plate, the organizational structure will also transform to martensite. The greater the cold working deformation, the more martensitic transformation, and the stronger the magnetism will be.

How to demagnetize 304 stainless steel plates: If you want to completely eliminate the magnetism of 304 stainless steel plates, you can restore the stable austenite structure through high-temperature solution treatment, thereby eliminating the magnetism. Therefore, the magnetism of 304 stainless steel plate material depends on whether the molecular arrangement is regular and the isotropic electron spin determines the physical properties of the material.

It should be pointed out that due to the above reasons, the magnetism produced by 304 stainless steel plates is not at the same level as the magnetism of stainless steel plates made of other materials, such as 430 stainless steel plates or carbon steel. In other words, the magnetism of 304 stainless steel plates is always obviously Weak magnetism.

So the result is that if the stainless steel has a weak magnetism or no magnetism at all, it can be identified as 304 stainless steel or 316 stainless steel. However, if it has the same magnetism as ordinary carbon steel and shows strong magnetism, it can only be identified as non-304 stainless steel. Material, but cannot have other more accurate results. If you want to accurately identify the material of the stainless steel plate, special testing is required.