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Stainless steel according to the structure can be divided into austenitic stainless steel, martensitic stainless steel, ferritic stainless steel. Among them, austenitic stainless steel is a kind of stainless steel with a usage of * * * * *. Stainless steel with austenitic structure is theoretically non-magnetic, but austenitic stainless steel will produce magnetism after cold working. According to some studies at home and abroad, the reason for the magnetism of austenitic stainless steel castings is that when the stainless steel is heated above the austenitic transformation temperature and kept for a period of time during the processing, the stainless steel will transform into austenite, however, stainless steel castings need to be cooled and formed. During the rapid cooling process, when the austenite is cooled to the martensite transformation temperature, its organization begins to transform into martensite, and the transformation will not be stopped until the temperature drops below the transformation temperature of the martensite structure. In the production of stainless steel castings, the stability of austenitic stainless steel, processing deformation, processing methods, etc. may affect its transformation into martensitic stainless steel.

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