Magnetic stainless steel is fake?

Release time: 2021-11-12

For stainless steel, everyone will also have an inherent impression that it is not magnetic. People often use stainless steel with or without magnetism to test the true and false stainless steel, and the magnetic ones are fake or substandard products. In fact, some stainless steel products are magnetic, and their magnetic properties are mainly determined by the stainless steel alloy composition, crystal structure and cold working process.

Next, we will understand the magnetic properties of stainless steel from the following two points. 1. Which stainless steel is magnetic?

(1) Non-magnetic stainless steel: austenitic stainless steel, the matrix is mainly austenite structure (CY phase) with face-centered cubic crystal structure, and is non-magnetic. The American Iron and Steel Institute is designated by numbers in the 200 and 300 series, such as 304, 316, 321, 310, etc.
(2) Magnetic stainless steel: ferritic stainless steel, the matrix is dominated by the ferrite structure (a phase) of the body-centered cubic crystal structure, and is magnetic. The American Iron and Steel Institute designates 430 and 446. Martensitic stainless steel has a martensitic matrix (body-centered cubic or cubic) and is magnetic. The American Iron and Steel Institute is designated by the numbers 410, 420 and 440. On the basis of these three basic metallographic structures, for specific needs and purposes, dual-phase steel and precipitation-hardening stainless steel are derived.
Now, everyone already knows. Many types of stainless steel are magnetic, but because non-magnetic austenitic stainless steel is the most widely used, it also gives everyone the wrong impression that stainless steel is not magnetic.

2. Why are some austenitic stainless steel products magnetic?
Students who left after reading the above question, pay attention. When you go home and find that the austenitic stainless steel you bought is still magnetic, and the third-party spectral test shows that there is no problem with the material, please Must be calm.
Fortunately, you have already bookmarked this article, and now you will open it again and you will see the answer to your question.
In theory, austenitic stainless steel should not be magnetic, but the products produced are magnetic. This is because the internal structure of the product changes during the cooling and forming process, and part of the austenite is transformed into martensite, while the martensitic stainless steel with body-centered structure is magnetic.
In the production of stainless steel products, the stability, processing deformation and processing methods of austenitic stainless steel may affect its transformation into martensitic stainless steel. The greater the cold working deformation, the more martensitic transformation, so the deformation is more Intense magnetism is stronger, so the presence or absence of magnetism cannot be used as the basis for judging whether the material is stainless steel.

Weicheng Technology's SS304 stainless steel for food, tobacco and other industries has certain weak magnetic properties. However, 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 designate non-magnetic stainless steel. At this time, degaussing treatment is required or the designated degaussing stainless steel grade is used.
Weicheng Technology was established in 2006, specializing in the research and development, manufacturing and sales of bridges for 15 years, focusing on product innovation and improvement, making the grid bridge product professional and becoming the champion of the market segment.

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