What is stainless steel?

Stainless steel is a type of steel, the amount of carbon (C) less than 2% is called steel, more than 2% is iron. During steel smelting process, add chromium (Cr), nickel (Ni), manganese (Mn), silicon (Si), titanium (Ti), molybdenum (Mo) and other alloying elements, then improve the performance of steel so that the steel has a corrosion resistance (do not rust) is that we often say stainless steel.