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Stainless steel is a kind of high alloy steel, and its main characteristics and definitions include corrosion resistance, stainless property, and the ability to resist corrosion in the air or in chemical corrosive media. The classification of stainless steel is diverse. It can be classified according to its metallographic structure into austenitic type, ferritic type, martensitic type, etc., and it can also be classified according to different compositions into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni (200 series), etc. Among them, the 300 series (such as 304) is one of the most common types.
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