What is steel? What is iron? How do welders recognize them during operation?

 

Commonly used chemical elementary symbols of pure metal materials: Fe,Mn,Cr,Ni,W,Mo,Ti,V,Al,Cu,Mg,Co.

 

Steel is an iron-carbon alloy in which the mass fraction of carbon (carbon content) is less than 2.11% and contains a small amount of Si, Mn, S, P and other elements. C, Si, Mn, S, and P are often called the five elements of steel. In addition to Si.. Mn, alloy steel also contains a certain amount of other alloying elements, such as Mo, W, V. Cr, etc., depending on different varieties. Steel has the necessary mechanical properties and excellent forgeability, and can be rolled into various profiles.

 

Iron is an iron-carbon alloy with a mass fraction of carbon of approximately 2.11% (the mass fraction of carbon is generally 2.5%-4.5%). In addition to containing Fe and C elements, iron also contains more Si, Mn, S, and more than steel. P and other elements. Iron is brittle, has no toughness, and cannot be forged and rolled. However, it has good casting properties and can be used to cast various parts with complex shapes. The iron used for casting into castings is also called cast iron.

 

Welders can use the arc test method to distinguish steel and cast iron during operation: use normal welding current to start arc combustion. If the arc is stable, the penetration is normal, and there is little smoke, it is steel; if the molten pool melts fast, the melting point is large, and the smoke particularly large. There are 11 slag-like pores in the molten pool, which are cast iron.

 

 

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