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Stainless steel during hot working, machining or place after a certain period of time the surface will form a layer of black or gray scale,

the main ingredients for Cr2O3, NiO and very refractory FeO, Cr2O3, affect the appearance quality,

their presence on the one hand, on the other hand also influence on the performance of the product use,

so to take appropriate measures to remove them.  

There have been many reports on the surface treatment of stainless steel, such as scale removal and finishing.  

As a mature surface treatment method, stainless steel polishing has been widely used, which can further improve the corrosion resistance and bright effect of stainless steel.