Stainless steel experts analyze stainless steel in

2022-07-22
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Stainless steel experts analyze stainless steel in all aspects

several misunderstandings in the identification of stainless steel materials

1. Stainless steel must not be on the magnet technetium

this is the biggest misunderstanding in the hearts of Chinese people! It can be said that if you go to any hardware store, the boss will tell you so. If you believe it, you are wrong. Stainless steel is not necessarily the magnet that can attract. (note that there are three words in this sentence.) stainless steel can be divided into many categories, of which the commonly used classification includes austenite, ferrite, duplex, martensite, precipitation hardening and other five categories (don't ask me what these terms mean, just remember, these are all terms of metalology). Among them, only austenitic stainless steel is non-magnetic, but this kind of stainless steel accounts for the vast majority of the stainless steel market (more than 70% in the past, only estimated 60% now, and less than 50% in the future), and is the most widely used. Other steel materials are magnetic, which is the origin of using magnetism to distinguish stainless steel in China's domestic market. But other kinds of stainless steel are magnetic. For example, many times you go to high-end restaurants to try those shiny stainless steel knives and forks with magnets. They are often magnetic. In fact, it is likely to be martensitic stainless steel, and the stainless steel of automobile exhaust pipe is also magnetic, which is ferritic

austenitic stainless steel often needs to add Ni. At present, the price of Ni in the world is very high, so a main development trend of stainless steel is how to save nickel. One of the good ways is to develop excellent ferritic stainless steel and duplex. So in the future, there will be more stainless steel that can be absorbed by magnets

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