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The chrome coating has a high hardness, usually between 600-800HV (Vickers hardness), while the hardness of stainless steel itself is low, about 150-250HV. Therefore, hardness testing can effectively determine whether the stainless steel roller is chrome-plated.

The main components of stainless steel are alloy elements such as iron, chromium and nickel. The proportion and distribution of these elements determine the corrosiveness and mechanical properties of stainless steel. Chromium, as a key component of stainless steel, has good corrosion resistance. Therefore, the chemical compatibility between stainless steel and chrome plating is good.