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People often think that the magnet absorbs stainless steel, to verify its merits and falseness, does not absorb no magnetic, that is good, genuine; Suckers have magnetic, is considered to be fake fake. In fact, this is an extremely one-sided, impractical and wrong way of identifying.
There are many kinds of stainless steel, which can be divided into several categories according to the organization structure at room temperature:
1, Austenitic body type: such as 304, 321, 316, 310, etc.
2, martensite or ferritin body type: such as 430, 420, 410, etc.;
The picture
Austenitic bodies are magnetically or weakly magnetic, and martensite or ferrite are magnetic.
Usually used as decorative tube plate stainless steel is mostly Austenitic 304 material, generally speaking, no magnetic or weak magnetic, but because of smelting caused by chemical composition fluctuations or processing state may also appear magnetic, but this can not be considered fake or unqualified, what is the reason?
As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to improper segregation or heat treatment during smelting, a small amount of martensite or ferrite structure in austenitic 304 stainless steel will be caused. In this way, 304 stainless steel will have a weak magnetic.
In addition, 304 stainless steel after cold processing, the structure will also be transformed to martensite, cold processing deformation, the more martensite transformation, the greater the magnetic steel. Like a batch of steel belt, the production of 76 pipe, no obvious magnetic sensation, the production of 9.5 pipe. Because the deformation of flapping bend is larger, the magnetic sense is more obvious. The square rectangular tube produced by flapping bend is larger than the round tube because of its deformation, especially the corner part, the deformation is more intense and the magnetism is more obvious.
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