Is it accurate to authenticate stainless steel with a piece of magnet?

Limitations in distinguishing stainless steel by magnet (magnetic)
In the process of testing stainless steel, people often use magnets to test the magnetic properties of stainless steel and mistakenly think that if the magnet does not attract or attracts very weakly (no magnetism or weak magnetism), it is stainless steel. However, this method is inaccurate (for reference only)
Stainless steel is a widely used metal material, which can be divided into many different types according to its internal structure, such as austenite, martensite and ferrite. Austenitic stainless steel such as: 201, 304, 316, is usually non-magnetic or weakly magnetic, while martensitic or ferritic stainless steel, such as 410, 420, 430, is magnetic. During the smelting process, the chemical composition or heat treatment may change, resulting in austenitic stainless steel containing a small amount of martensite or ferrite, resulting in weak magnetic properties. In addition, cold working can also cause the structure of austenitic stainless steel to transform into martensite, thereby increasing its magnetic properties.

Therefore, distinguishing the authenticity of stainless steel by its magnetic properties alone is one-sided. To accurately determine the authenticity of stainless steel, we need to consider the chemical composition, internal structure, processing technology and other factors. Only by comprehensively understanding the properties of stainless steel and conducting comprehensive analysis can we make an accurate judgment.