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Today, let's continue to popularize the role 
and function of various chemical components in steel.
13. Cu: The prominent role in steel is to improve 

the atmospheric corrosion resistance of ordinary low-alloy steel, especially 

when used in combination with phosphorus, 

adding copper can also improve the strength and yield ratio of steel, 
and it has no adverse effect on welding performance. .
14. B: Adding a small amount of boron to the steel 
can improve the compactness and hot rolling properties of 
the steel and increase the strength.
15. Re: Rare earth elements can improve the oxidation resistance 
and corrosion resistance of steel.
 The effect of oxidation resistance exceeds 
that of elements such as silicon, aluminum, and titanium.
16. N: Nitrogen can be partially used in iron, 
which has the effect of solid solution strengthening 
and hardenability improvement. 
Due to the precipitation of nitrides on grain boundaries, 
it can improve the high temperature strength of grain boundaries 
and increase the creep strength of steel.
17. S: Increasing the content of sulfur and manganese 
can improve the cutting performance of steel.
18. P: Phosphorus is added as an alloying element to
 low-alloy structural steel, 
which can improve its strength and atmospheric corrosion resistance of steel, 
but reduce its cold stamping performance.
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