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Why does the stainless steel bring the magnet?
Jun 27, 2018

Why does stainless steel come with magnetic?


    People often think that the magnet adsorption of stainless steel, to verify its advantages

 and disadvantages and authenticity, do not smoke non-magnetic, that is good, genuine;

 suction magnetic, is considered counterfeit fake. In fact, this is a very one-sided, unrealistic

 way to identify the wrong.


    A wide range of stainless steel, according to the organizational structure at room temperature

 can be divided into several categories:


    1. Austenitic type: such as 304,321,316,310,201 and so on;


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


    Austenitic type is non-magnetic or weak magnetic, martensite or ferrite is magnetic.

 

    Most of the stainless steel commonly used as decorative tube sheet is austenitic 304 material,

 generally magnetic or weak magnetic, but due to smelting caused by chemical composition

 fluctuations or processing status may also appear magnetic, but this can not be considered Fake

 or unqualified, what is the reason for this?


    The above mentioned austenite is non-magnetic or weak magnetic, and martensite or ferrite 

is magnetic, due to smelting component segregation or improper heat treatment, will cause 

austenitic 304 stainless steel in a small amount of martensite or iron Body tissue. In this way,

 304 stainless steel will be with a weak magnetic.

 

    In addition, 304 stainless steel after cold processing, the structure will be transformed

 into martensite, cold forming the greater the degree of deformation, the greater the 

transformation of martensite, steel, the greater the magnetic. As a batch of steel, production 

Φ76 tube, no obvious magnetic induction, production Φ9.5 tube. Due to Ling bending deformation 

of the larger magnetic sense is obvious, the production side of the rectangular tube deformation 

than the tube, especially the corner part of the deformation is more intense magnetic more obvious.



    In order to completely eliminate the above-mentioned causes of the 304 steel magnetic, can be

 recovered by high temperature solution to stabilize the austenite structure, thereby eliminating

 the magnetic.


    In particular, it is due to the above reasons caused by the 304 stainless steel magnetic, with

 other materials of stainless steel, such as 430, carbon steel is not the same level of magnetic,

 that is, 304 steel magnetism always shows the weak magnetic.


    This tells us that if the stainless steel with weak magnetic or completely without magnetic,

 should be judged as 304 or 316 material; if the magnetic properties of carbon steel, showing 

strong magnetic, because the judge is not 304 material.


    Therefore, the proposed purchase of stainless steel products should be reputable manufacturers

 of products, do not be cheap, beware of being taken.


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