According to the content of nickel, stainless steel pellets can be divided into nickel-containing pellets and nickel-free pellets. Among them, stainless steel pellets containing no Ni are SUS430 and sus4 10 (commonly known as stainless steel iron). The internal structure of these stainless steel particles is ferrite and magnetic. When Ni is greater than or equal to 8, stainless steel pellet SUS304 is strictly nonmagnetic. (Can't be held by a magnet), but in the production process of stainless steel pellets, the stainless steel wire is cut into sections, which is commonly known as stainless steel wire cutting balls, and then rounded in a rounding machine. In this process, part of austenite is transformed into ferrite, so it can still be adsorbed by magnets, and the pollution degree of stainless steel wire particles is less than that of stainless steel particles.

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