Magnetic stainless steel is fake - Knowledge

Magnetic stainless steel is fake?

When it comes to say stainless steel, we have an inherent impression: it is not magnetic.

So the following scene often happens: you go to buy stainless steel products, the salesman took out a magnet, and tell you the way to identify stainless steel. If you ask him why it can identify stainless steel, he will say that stainless steel is not magnetic.

In fact this test method is not correct. We often take with magnetic inspection of stainless steel, If it has magnetism is false corn or unqualified products.

Actually it is not true, some of stainless steel product has magnetic, its magnetism basically is by stainless steel alloy composition, crystal structure and cold processing process decision. Next, we will understand the magnetism of stainless steel from the following two points.

What kind of stainless steel has magnetic properties?

1. Non-magnetic stainless steel austenitic stainless steel, matrix with face-centered cubic crystal structure of austenite structure (CY phase). Non-magnetic. The American iron and steel institute uses 200 and 300 series numbers, such as 304, 316,321, 310, etc.

2. magnetic stainless steel ferritic stainless steel, the matrix to the body - centered cubic crystal structure of ferritic structure (a phase, magnetic. The American Iron and Steel Institute is 430 and 446. Martensitic stainless steel, matrix martensitic structure (body centered cubic or cubic), magnetic, designated 410,420 and 440 by the American iron and steel institute.

On the basis of these two basic metallographic structures, for specific needs and purposes, derived dual-phase steel, precipitation hardening stainless steel, matrix with both austenite and ferrite two-phase structure, also with magnetic. Many kinds of stainless steel are with magnetic, but because of the non-magnetic austenitic stainless steel is the most widely used, it caused the wrong impression that stainless steel is not magnetic.

Why are some austenitic stainless-steel products magnetic?After reading the above question, when your country found that what you bought was obviously austenitic non-stitched steel but still had magnetic properties, and the third-party spectral detection showed that there was no problem with the material, please be calm. In theory, austenitic stainless pot should not have magnetic, but the production of the product is magnetic, because the internal structure of the product has changed in the process of cooling molding. Part of the austenite is converted to martensite, and the martensitic stainless steel with a core structure is magnetic. In the production of stainless-steel products, the stability of the austenitic stainless steel, the processing deformation, and processing methods are likely to affect the transformation of martensite stainless steel, cold work, the greater the deformation martensite transformation, the more so the deformation of the more intense magnetic is stronger so the presence of magnetic cannot serve as the basis for judging whether the material is stainless steel.

Vichnet’s stainless steel is fit for food, tobacco and other industries with a certain weak breaking, but the magnetic reaction has no negative impact on the performance of the product,99% of customers do not need non-magnetic stainless steel, only a few customers will specifically specify not magnetic stainless steel.

At this time need to do degaussing treatment or use the specified degaussing stainless steel brand. Vichnet Technology was established in 2006, specializing in the research and development, manufacturing and sales of bridge frames for 16 years, focusing on product innovation and improvement, the grid bridge products to be professional, become the market segment champion.