The stainless steel inoxidizability is decided by the chromium, but because the chromium is one of steel constituents, therefore the protection method is different.

In the chromium recruitment achieved when 10.5%, the steel bears the atmospheric corrosion performance remarkable increase, when the chromium content is higher, although still might enhance the inoxidizability, but was not obvious.The reason is with the chromium when carries on alloy processing to the steel, the superficial oxide compound type changes has been similar the superficial oxide compound which forms on the pure chromium metal.
 
This kind of close adherency rich chromium oxide compound protective coating, prevented further oxidizes.This kind of oxide layer is extremely thin, penetrates it to be possible to see steel surface natural gloss, enable the stainless steel to have the unique surface.Moreover, if has damaged the surface layer, exposes the steel surface can with the atmosphere respond carries on the self-repair, forms this oxide compound " deactivated membrane ", continues the protective function.Therefore, all stainless steel element all has one common characteristic, namely chromium content above 10.5%.

Besides the chromium, the commonly used alloying element also has the nickel, the molybdenum, the titanium, the niobium, the copper, the nitrogen and so on, satisfies each use to the stainless steel organization and the performance request.




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