Mild steel (iron containing a small percentage of carbon, strong and tough but not readily tempered), also known as plain-carbon steel and low-carbon steel, is the most common form of steel because its price is relatively low while it provides material properties that are acceptable for many applications.
Mild steel contains approximately 0.05–0.26% carbon making it malleable and ductile. Mild steel has a relatively low tensile strength, but it is cheap and easy to form. Surface hardness can be increased through carburizing.
There are several characteristics of mild carbon steel that make it a good choice for a number of applications: