Because stainless steel will produce black powder when polished, a dense black protective film will be formed on its surface through chemical oxidation reaction. After blackening, the brightness of the surface depends on the brightness of the stainless steel surface, which is a normal phenomenon and can be cleaned with detergent.

The density of 304 stainless steel is 7.93 g/cm? , also known as 18/8 stainless steel in the industry. High temperature resistance of 800℃, good processability and high toughness, widely used in industry, furniture decoration industry and food and medical industry.

Extended data:

Common marking methods in the market are 06Cr 19Ni 10 and SUS304, in which 06Cr 19Ni 10 generally represents national standard production, 304 generally represents ASTM standard production and SUS 304 represents Japanese standard production. 304 is a general-purpose stainless steel, which is widely used to manufacture equipment and parts that require good comprehensive performance (corrosion resistance and formability).

In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a stainless steel brand produced according to American ASTM standard.