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The grade of stainless steel usually refers to the classification standards of its chemical composition and physical properties. Common classification methods include ASTM standards in the United States, European standards, and Japanese standards. In the field of kitchen sinks, the most widely used is austenitic stainless steel, mainly including grades 304 and 316.

An important feature of 304 stainless steel is that it is austenitic stainless steel and is usually not magnetic. Although the surface of 304 stainless steel may be slightly magnetic, its magnetism is much lower than that of iron materials. Therefore, testing by magnet method is a simple way to identify whether a 304 stainless steel sink is truly 304.

304 stainless steel sinks have good ductility during processing and can be processed into sinks of different shapes without being easily deformed. In contrast, 301 stainless steel may face greater difficulties during processing due to its higher strength.