"Micro Cooling Fan" grille stainless steel under certain conditions will be rusty. Stainless steel has the ability to resist the atmospheric oxidation of stainless steel --- namely, while also having the acid, alkali, salt corrosion medium is the ability --- namely corrosion resistance. But its size is corrosion resistance of steel itself with its chemical composition, plus mutual status, "Micro Cooling Fan" grille conditions of use and environmental media type change. Such as 304 steel, in a clean dry atmosphere, there is absolutely excellent anti-corrosion ability, but to move it to the waterfront area, contains a lot of salt in the sea mist, and will soon be rusty; and "Micro Cooling Fan"grille is performing well. Therefore, not any kind of stainless steel, in any environment corrosion resistant, not rust.