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The reason of stainless steel band magnetism

The reason of stainless steel band magnetism

E-BON E-BON 2017-09-05 13:28:14
People often think that the magnet adsorption of stainless steel, verify its advantages and disadvantages, and do not smoke, there is no magnetic, that is good, genuine, smoke is magnetic, so that is fake, fake. In fact, this is an extremely one-sided and erroneous method of discrimination.

There are many kinds of stainless steel. They can be divided into the following categories according to the organizational structure at normal temperature:

1. Austrian shape: such as 304, 321, 316, 310 and so on;

2. Martensite or ferrite: such as 430, 420, 410 and so on;

The austenite is nonmagnetic or weakly magnetic, and the martensite or ferrite is magnetic. E-BON the most excellent stainless steel company, which provide you with Cocktail Shaker Set China.
Most commonly used as a decorative tube plate is austenitic stainless steel 304 material is generally non-magnetic or weakly magnetic, but fluctuations in chemical composition caused by smelting or processing of different magnetic properties may also appear, but this can not be considered to be counterfeit or substandard, what is the reason?

The above mentioned austenite is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic, due to melting segregation or improper heat treatment, will cause a small amount of martensite Austenitic 304 stainless steel body or ferrite. In this way, 304 stainless steel will have a weak magnetic. E-BON the stainless steel specialist, pineapple cup manufacturer china.

In addition, 304 stainless steel after cold processing, the structure of the structure will also change to martensite, and the greater the deformation degree of cold work, the more martensitic transformation, the greater the magnetic properties of steel. 

Like a lot of the strip, with 76 production tube, no obvious magnetic induction; production with 9.5 tubes, because of cold bending deformation of large induction is obvious; the production of rectangular pipe due to deformation than the cylinder, especially the angle of the magnetic properties of more intense deformation is more obvious.
In order to completely eliminate the magnetic properties of the 304 steel caused by the above reasons, the stable austenite structure can be recovered by the solution treatment at high temperature so as to eliminate the magnetism.

In particular, magnetic because it causes 304 stainless steel, and other materials such as stainless steel, carbon steel, magnetic 430 is not the same level, that is to say the magnetic steel 304 always showed a weak magnetic.

This tells us, if the stainless steel band is weak magnetic or completely without magnetism, should be identified as 304 or 316 material; if the same as carbon steel magnetic, showing strong magnetism, should be judged as not 304 material.

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