To understand the plain carbon steels, you need to understand the term of ‘steel’ which is explained in Mechanical Base. In this article we will explain the plain carbon steels, designation of plain carbon steels and the classification of plain carbon steels with the applications they are used in.
Plain carbon steel is the steel that includes only carbon elements as alloying elements inside it. But there can be other elements inside the plain carbon steels such as 0.4% of manganese and lesser amounts of other elements.
According to the iron-carbon phase diagram, plain carbon steels are include cementite+ferrite microstructure in it. These cementite particles are distributed along the ferrite microstructure that they act as obstacles to dislocation motions in material. This is a very important phenomenon to obtain strength in steels. So if we add much more carbon alloying element, the strength of steel will be much more higher because of these obstacles are created in the microstructure of steel.
If we take a look at the designation of plain carbon steels, it is very easy. According to the AISI and SAE, the designation of plain carbon steels are in the form of 10XX. 10 means, this element is plain carbon steel and the XX is the carbon content inside material. For example 1030 means, plain carbon steel that includes 0.3% of carbon as alloying element.
How Is The Classification Of Plain Carbon Steels?
As you understand above, if the carbon content in steels increase, hardness and strength increases. But the ductiliy decreases.
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