Mild Steel VS Low Carbon Steel?

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Steel is an alloy of iron and carbon. all steel is carbon steel. Carbon steel is used to denote steel with carbon as the main alloying element.

In carbon steel, the properties are mainly defined by the amount of carbon it has. For this alloy, the amounts of other alloying elements like chromium, manganese, cobalt, tungsten are not defined.

There are four types of carbon steel based on carbon content.

Low Carbon Steel(0.05–0.25% carbon)

Medium Carbon Steel(0.30–0.59% carbon)

High Carbon Steel (0.6-0.99% carbon)

Very High Carbon Steel (1.0-2.0% carbon)

The hardness increasing as the carbon content increases. They can undergo heat treatment successfully. Therefore, normally these are very strong and hard, but ductility can below.


Mild steel has small amounts of carbon between 0.16 and 0.3%. It is therefore a type of low carbon steel where it contains very low amounts of carbon. It is difficult to distinguish the steel is mild or not with the naked eye, so it belongs to the microgeometry errors.

Mild steel is "soft and formable", they are cheap material with good weldability, formability, low ductile-brittle transition temperature. They are used in cars, trucks, ship hulls, bridges and other structures that are designed to handle large amounts of Stress or anything that requires a huge amount of steel. It is usually used rebar or for I beams and is also called "structural steel" sometimes.

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