Why is the 304 stainless steel plate magnetic?

People often use magnets to attract stainless steel plates to verify their pros and cons and their authenticity. If they do not attract and have no magnetism, they think they are good and genuine; those who attract magnets are considered counterfeit. In fact, this is an extremely one-sided, unrealistic and wrong identification method.

There are many kinds of stainless steel plates, which can be divided into several categories according to the organizational structure at room temperature:

1.     Austenitic type: such as 304, 321, 316, 310, etc.;

2.     Martensite or ferrite type: such as 430, 420, 410, etc.;

Among them, the austenite type is non-magnetic or weakly magnetic, and the martensite or ferrite is magnetic.

Most of the stainless steel plates usually used as decorative tube sheets are austenitic 304 materials, which are generally non-magnetic or weakly magnetic, but may also appear magnetic due to fluctuations in chemical composition or different processing conditions caused by smelting, but this cannot be considered Is it fake or unqualified, what is the reason for this? Due to the segregation of components or improper heat treatment during smelting, a small amount of martensite or ferrite structure will be formed in the austenitic 304 stainless steel plate. In this way, the 304 stainless steel plate will have weak magnetism.

HCADTO Stainless Steel Co., Ltd. the Stainless Steel Division of ADTO GROUP, specializes in manufacturing stainless steel pipes, stainless steel angle bar, flat bar, round bar, square bar, hexagonal bar and channel bar in various grades and sizes. Our years of production experience and manufacturing facilities will ensure the good quality and competitive duration of our products.