People often think that magnets absorb stainless steel, verify its advantages and disadvantages and authenticity, do not absorb non-magnetic, think it is good, the goods are genuine; the smoker is magnetic, it is considered a counterfeit fake. In fact, this is an extremely one-sided, unrealistic way of distinguishing mistakes.
There are many types of stainless iron, which can be divided into several categories 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 non-magnetic or weakly magnetic, and martensite or ferrite is magnetic.
Most of the stainless iron used as decorative tube sheets is austenitic type 304 material, which is generally non-magnetic or weakly magnetic. However, magnetic properties may occur due to chemical composition fluctuations or processing conditions, but this may not What is the reason for the counterfeit or unqualified?
It is mentioned above that austenite is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, austenite 304 may be caused by a small amount of martensite or Ferrite organization. Thus, 304 stainless steel will have weak magnetic properties.
In addition, 304 stainless steel is cold-worked, and the microstructure is also transformed into martensite. The greater the degree of cold work deformation, the more martensite transformation and the greater the magnetic properties of iron. Like a batch of iron belt, it produces Φ76 tube, no obvious magnetic sense, and produces Φ9.5 tube. Due to the large deformation of the bending, the magnetic induction is obvious. The rectangular tube produced is larger than the round tube, especially the angled part, and the deformation is more intense and the magnetic is more obvious.
In order to completely eliminate the magnetic properties of 304 iron caused by the above reasons, the austenite structure can be restored by high temperature solution treatment to eliminate magnetic properties.
In particular, the magnetic properties of 304 stainless iron caused by the above reasons are not at the same level as the magnetic properties of other materials such as 430 and carbon iron. That is to say, the magnetic properties of 304 iron always show Weak magnetic.
This tells us that if the stainless steel strip is weakly magnetic or not magnetic at all, it should be judged as 304 or 316 material; if it is magnetic similar to carbon iron, it shows strong magnetism, because it is judged not to be 304 material.
We suggest that the purchase of stainless iron products should be selected from reputable manufacturers' products, not to be cheap, beware of being fooled.
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