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Why is Stainless steel cable railing magnetic?

Mar 08, 2018

People often think that magnets absorb stainless steel, verify its pros and cons and authenticity, do not absorb non-magnetic, that is good, genuine; suckers have magnetic, it is considered fake counterfeit goods. In fact, this is an extremely unilateral and imprecise method of identifying mistakes.

There are many types of stainless steel, which can be divided into several types according to the organizational structure at room temperature:

1. Austenitic type: such as 201, 202, 301, 304, 316, etc.;

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

The austenite type is either non-magnetic or weakly magnetic, and martensite or ferrite is magnetic.

Stainless steel, commonly used for Stainless steel cable railing, is mostly austenitic 316, which is generally magnetically or magnetically weak but can also be magnetically susceptible to chemical fluctuations or processing conditions due to smelting, but this can not be considered Is counterfeit 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 ferrite in austenitic 316 stainless steel may be caused. Body organization. In this way, 316 stainless steel will have a weak magnetic.

In addition, 316 stainless steel after cold processing, the organization structure will also be transformed to martensite, the greater the cold deformation degree, the more martensite transformation, the greater the magnetic steel. Like the round rod of the same batch, the production of Φ76, no significant sense of magnetic, production Φ9. 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 folded part, the deformation is more intense magnetic more obvious.

In order to completely eliminate the magnetic properties of 316 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 magnetic properties of 316 stainless steel caused by the above reasons are totally different from the magnetic properties of other materials such as 430 and carbon steel, that is, the magnetic properties of 316 or 304 steel always show weak magnetic properties .

This tells us that if stainless steel is weakly magnetic or completely magnetic, it should be judged to be 316; if it is magnetic like carbon steel, it shows strong magnetism, because it is not 316 material.

(TERADA HARDWARE/www.teradahardware.com)

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