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Jun 15, 2017

These people think that no magnetism is stainless steel, in fact, there is no magnetic can not judge the pros and cons of stainless steel (304 steel will also have magnetic)

People often think that magnets to absorb stainless steel, verify its merits and demerits, do not absorb non-magnetic, think is good, genuine, the suction is magnetic, it is considered counterfeit fake. In fact, this is an extremely one-sided, not practical wrong way to identify. Stainless steel variety, at room temperature according to organizational structure can be divided into several categories:


1. Austenitic body size: such as 304, 321, 316, 310, etc.

2. Martensite or ferrite body size: such as 430, 420, 410, etc.;

The austenitic body is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic. Usually used as decorative tube plate of stainless steel is mostly austenitic body 304 material, generally speaking is non-magnetic or weak magnetism, but because smelting caused chemical composition fluctuations or processing state different may also appear magnetic, but this can not be considered false or unqualified, what is the reason? The above mentioned austenite is non-magnetic or weak magnetism, and martensite or ferrite is magnetic, due to the segregation of components in smelting or improper thermal treatment, will cause austenitic 304 stainless Steel in a small number of martensite or ferrite tissue. In this way, 304 stainless steel will have a weak magnetic. In addition, 304 stainless steel after cold processing, the structure will also be converted to martensite, the greater the deformation of cold machining, martensite transformation More, the greater the magnetic steel. As a number of steel belt, the production of Siami 76 tube, no obvious magnetic sense, production Shong. 5 tubes. Due to the deformation of the cold bending of a larger magnetic sense is obvious, the production square rectangular tube due to deformation than the round tube, especially the angle of the part, more intense deformation more obvious. To completely eliminate the above-mentioned causes of the magnetic 304 steel, through high temperature solution to restore the stability of the austenite structure, thereby eliminating magnetism. In particular, because of the above reasons for the 304 stainless steel magnetic, and other materials of stainless steel, such as 430, carbon steel magnetic is not the same level, that is, 304 steel magnetic always show is weak magnetic. This tells us that if the stainless steel with weak magnetic or completely non-magnetic, should be judged as 304 or 316 material, if the same as carbon steel magnetic, showing strong magnetism, because the discriminant is not 304 material. The purchase of stainless steel products should be selected reputable manufacturers of products, do not cheap, beware of fooled.