Under the condition of ordinary plate or rolling plate, if it is not processed deeply, it will not be attracted by the magnet. However, if it is stretched deeply, there is a local martensitic structure in 304, showing tiny magnetism, it may be attracted by the magnet at this time. Therefore, if the board Zhidao can be absorbed by magnet, it must not be 304. If the product can be absorbed by magnet, it must not have been demagnetized. If a stainless steel product can be absorbed, the content of iron and nickel is very high. Such stainless steel products are not specially good in general corrosion resistance, because the stainless steel mainly comes from chromium metal. But it's cheaper and more durable. However, the quality of stainless steel can not only be identified by the magnet. Some inferior stainless steel products are mixed with a large number of manganese metals. Manganese can't be absorbed by magnet, but the corrosion resistance of the product decreases a lot after taking part in manganese. Such products can't be absorbed by the absorbers, but the quality is very poor. There are two kinds of solid structure of iron, one is face centered cubic, called austenite, the other is body centered cubic, called ferrite. Ordinary steel is ferritic at room temperature and can be absorbed by magnets. There are many kinds of stainless steel, the most common one is austenitic stainless steel containing chromium and nickel, such as 0Cr18Ni9, which contains 18% chromium and 9% nickel. The magnetism of this stainless steel is very weak. However, chromium containing stainless steel without nickel or low nickel is usually a martensitic stainless steel, such as Cr12. They are magnetic and their corrosion resistance is not as good as austenitic stainless steel. In recent years, the price of nickel has skyrocketed, so we ask some bad manufacturers to replace austenitic stainless steel with martensitic stainless steel. Therefore, we can take a neodymium iron boron magnetic iron to check the stainless steel, and the stainless steel that can be absorbed is certainly not good.
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