Introduction of low carbon steel
Mild steel is a carbon steel with a carbon content of less than 0.25%. It is also called mild steel because of its low strength, low hardness and softness. It includes most of the ordinary carbon structural steel and a part of high-quality carbon structural steel, most of which are not heat treated for engineering structural parts, and some are carburized and other heat treatments for mechanical parts requiring wear resistance.
The low carbon steel annealed structure is ferrite and a small amount of pearlite, which has low strength and hardness, and good plasticity and toughness. Therefore, the cold formability is good, and cold forming can be performed by a method such as crimping, bending, or press. This steel also has good weldability. Low carbon steels with a carbon content ranging from 0.10% to 0.30% are easily accepted for various processes such as forging, welding and cutting, and are commonly used in the manufacture of chains, rivets, bolts, shafts, etc.