Low carbon steel is carbon steel with a carbon content of less than 0.25%. It is also called soft steel because of its low strength, hardness, and softness. It includes most ordinary carbon structural steels and some high-quality carbon structural steels. Most of them are used for engineering structural parts without heat treatment, and some are used for mechanical parts requiring wear resistance after carburizing and other heat treatments.
The annealed structure of low carbon steel is ferrite and a small amount of pearlite. Its strength and hardness are low, and its plasticity and toughness are good. Therefore, it has good cold formability and can be cold-formed by curling bending stamping, and other methods. This steel also has good weldability. Low carbon steel with a carbon content ranging from 0.10% to 0.30% is easy to accept in various processing such as forging, welding, and cutting, and is often used to make chains, rivets, bolts, shafts, etc.

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