Difference between stainless steel photovoltaic bolts and iron bolts

Stainless steel is more and more popular with people because of its corrosion resistance and not easy damage. So what is the difference between stainless steel photovoltaic bolts and iron bolts?
The steel and iron refining processes are carried out using redox reactions, but there is a big difference between the two in the reaction object. Ironmaking is to reduce iron, while steelmaking is to remove excess carbon in pig iron and other Removal of impurities. So iron and steel are distinguished by their carbon content. Iron-carbon alloys with carbon content below 2% are steel, and those with carbon content above 2% are called iron. So from a metallurgical point of view, there is no such thing as stainless iron.
Yangang is widely used because of its toughness, elasticity and rigidity. The common reason for most consumers to buy is that stainless steel does not rust, and the measure is whether it will be attracted by magnets. As far as rust is concerned, rust is not resistant to corrosion. The main element that determines the corrosion resistance of stainless steel is chromium. Steels with chromium content above 10.5% will not rust. At this time, the oxidation of chromium with the corrosive medium will form an oxide film on the surface, which can prevent basic further corrosion.