Why water treatment equipment need to be magnetized
People often think that magnets absorb water treatment equipment, verify its advantages and disadvantages and authenticity, do not absorb non-magnetic, think it is good, the goods are genuine; if the absorber is magnetic, it is considered a counterfeit. In fact, this is an extremely one-sided, unrealistic way of distinguishing mistakes.
There are many types of water treatment equipment, which can be divided into several categories according to 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 water treatment equipment used as decorative tube sheets are austenitic type 304 materials, which are 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 being considered a counterfeit or failing?
It is mentioned above that austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, a small amount of martensite in austenite 304 water treatment equipment or Ferrite organization. Thus, the 304 water treatment equipment will have weak magnetic properties.
In addition, the 304 water treatment equipment is cold-processed, and the microstructure is also transformed into martensite. The greater the cold work deformation, the more martensite transformation and the greater the magnetic properties of the steel. Like a batch of steel strips, it produces Φ76 tubes with no obvious magnetic induction and produces Φ9.5 tubes. 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 the 304 steel caused by the above reasons, the austenite structure can be restored by high-temperature solution treatment to eliminate the magnetic properties. In particular, the magnetic properties of the 304 water treatment equipment caused by the above reasons are not at the same level as the magnetic materials of other materials such as 430 and carbon steel. That is to say, the magnetic properties of 304 steel always show Weak magnetic. This tells us that if the water treatment equipment is weakly magnetic or not magnetic at all, it should be judged as 304 or 316 material; if it is the same as the magnetic steel, it shows strong magnetism, because it is judged not to be 304 material.
Therefore, it is recommended that the purchase of water treatment equipment products should be selected by reputable manufacturers of products, do not be cheap, beware of being fooled.