The internal elements of stainless steel complex, there are five main, the five elements plays a decisive influence on the performance of the stainless steel pipe fittings, good or bad depends on how you take hold of the content.In addition to these main elements, and other trace elements, such as Cr, Ni, etc., but these trace elements can have certain influence on the performance of the stainless steel pipe fittings, so also should control strictly.(1) carbon steel depends mainly on the performance of carbon content.Carbon content in steel increases, the strength and hardness of the steel value increased and the plasticity and toughness decreases.(2) silicon in the casting of the carbon steel, silicon mass fraction is 0.2% - 0.2%, the content of the effects of a range of mechanical properties.Requirements have certain content of silicon is to ensure that the steel deoxidized, therefore, silicon is a beneficial element in steel.