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Why electromagnetic stainless steel with magnetic
People often think that magnets absorb electromagnetic stainless steel, verify its advantages and disadvantages and authenticity, do not absorb non-magnetic, think it is good, genuine; suckers have magnetic, it is considered fake counterfeit goods. In fact, this is a very one-sided, imprecise and erroneous method of identification.
There are many types of electromagnetic stainless steel, which can be divided into several types according to the 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 either non-magnetic or weakly magnetic, and martensite or ferrite is magnetic.
The most commonly used electromagnetic stainless steel for decorative tube sheets is austenitic type 304. Generally speaking, it is non-magnetic or weakly magnetic. However, magnetic properties may occur due to chemical composition fluctuations or processing conditions. However, this cannot be considered as magnetic. Is it fake or unqualified? What is the reason?
As mentioned above, austenite is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, a small amount of martensite or iron in austenitic 304 stainless steel may be caused. Body tissue. In this way, 304 magnetic stainless steel will have a weak magnetic.
In addition, 304 stainless steel after cold processing, the organization structure will also be transformed to martensite, the greater the degree of cold deformation, the more martensite transformation, the greater the magnetic steel. Such as the same batch of steel, production Φ76 tube, no significant sense of magnetic, production Φ9.5 tube. Due to the large bending deformation of the magnetic induction is obvious, the production of rectangular tube due to the deformation of the larger than the round tube, especially the folding part, the deformation is more intense magnetic more obvious.
In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, the stable austenite structure can be recovered by high-temperature solution treatment, thereby eliminating magnetic properties.
In particular, the magnetism of the 304 electromagnetic stainless steel due to the above reasons is not the same as the magnetic properties of electromagnetic stainless steels of other materials such as 430 and carbon steel. That is, the magnetic properties of the 304 steel always show weak magnetic properties. .
This tells us that if the electromagnetic stainless steel with weak magnetic or completely non-magnetic, should be judged as 304 or 316 material; if the magnetic properties of carbon steel, showing a strong magnetic, because it is determined not to 304 material.
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