Stainless steel can be roughly divided into three categories: 200 series, 300 series, and 400 series. The 300 series is the most commonly used, while the 200 series and 400 series are substitutes for the 300 series to a certain extent. It should be noted that the 400 series is often called stainless iron because it does not contain nickel, so it can be attracted by magnets. However, the 200 series and 300 series contain nickel, so they are not magnetic and cannot be attracted by magnets.

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