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What is steel
Apr 23, 2018

The definition of iron and steel

Iron and steel is an alloy composed of iron and C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulfur) and a small amount of other elements. In addition to Fe (iron), the content of C plays a major role in the mechanical properties of steel, so it is commonly referred to as iron carbon alloy. It is the most important and most used metal material in engineering technology.


The definition of steel

Steel is an iron - carbon alloy with a carbon content of 0.03% - 2%. Carbon steel is the most commonly used common steel. It is easy to smelt and easy to process. According to carbon content, carbon steel is divided into low carbon steel, medium carbon steel and high carbon steel, and alloy steel is also called special steel. On the basis of carbon steel, one or more alloy elements are added to change the structure and properties of the steel. The alloy elements often added to the steel are Si, W, Mn, Cr, Ni, Mo, V, Ti and so on.


The definition of pig iron

Iron carbon alloy with a carbon content of 2% ~ 4.3% is called pig iron. The pig iron is hard and crisp, but it is resistant to pressure and wear-resisting. It is divided into white iron, gray iron and spheroidal graphite cast iron. White iron is silver white, hard and brittle, and can not be machined. It is a raw material for steelmaking. It is also called steelmaking pig iron. Gray iron, the fracture is silver gray, easy to cut, easy to cast, wear resistant. Spheroidal graphite cast iron, its properties are close to steel. Special cast iron can be obtained by adding special alloy elements in cast iron.








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