High carbon steel: approximately 0.55%-0.95% carbon content and 0.30-0.90% manganese content. Very strong, used for springs and high-strength wires.

As carbon content rises the metal becomes harder and stronger but less ductile and more difficult to weld. Higher carbon content lowers steel's melting point and its temperature resistance in general.

High carbon steels which can successfully undergo heat-treatment have a carbon content in the range of 0.30% to 1.70% by weight. Trace impurities of various other elements can have a significant effect on the quality of the resulting steel. Trace amounts of sulfur in particular make the steel red-short.

Advantages:
1. High hardness and better wear resistance after heat treatment (HRC60 65).
2. Moderate hardness under annealed condition, good cutting property.
3. Simply available raw material, low production cost.