Typically, 410 stainless steel plate stainless steel (represented in 304) is non-magnetic, but may have weak magnetism, and ferrite (mainly 430,409 L, 439, and 445NF etc.) and martensite (in 410 as the representative) are generally with magnetic.
magnetic stainless steel there are some kinds of Precision stainless steel(such as 304, etc.) are classified as "non-magnetic stainless steel" refers to its magnetic indicator just below a certain value, that is, more or less generally stainless steel with a certain magnetism.
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