Carbon steel is an iron-carbon alloy containing carbon, also called carbon steel. The higher the carbon content, the greater the hardness and strength, but the lower the plasticity.

Low carbon steel has low carbon content (WC ≤0.25%), low strength, and low hardness. It is also called mild steel. It has good plasticity and toughness and good cold formability. It can be cold formed by curling, bending, stamping, etc. Forming and good weldability.

Medium carbon steel has moderate carbon content (WC 0.25%-0.6%). Medium carbon steel has certain plasticity, good toughness and strength, second only to low carbon steel. The welding performance is not high, but the thermal processing and cutting performance are good.

High carbon steel with carbon content (WC ≥0.6%), also known as tool steel, has high strength, high hardness, high elastic limit and fatigue limit, poor welding ability, poor cold plasticizing ability, and good wear resistance , good machinability.