Is stainless steel magnetic?

People often think that magnets attract stainless steel to verify its merits and authenticity. It does not attract non-magnetic materials. It is considered good and genuine. If the attractor is magnetic, it is considered a fake. In fact, this is an extremely one-sided and impractical method of discriminating.

There are many types of stainless steel, which can be divided into several categories according to 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 .;

The austenite type is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic.

The most commonly used stainless steel for decorative tube sheets is austenitic 304 material. Generally speaking, it is non-magnetic weak magnetic, but the magnetic composition may fluctuate due to smelting or the processing status may be different. Or failed, what is the reason?

As mentioned above, austenite is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic. Due to segregation of components during smelting or improper heat treatment, it will cause a small amount of martensite or ferrite in austenitic 304 stainless steel. Body organization. In this way, 304 stainless steel will have a weak magnetic.