Carbon steel with a carbon content typically between 0.1% and 0.25%, characterized by relatively low strength and good plasticity; commonly used in construction.

Carbon steel with a carbon content between 0.6% and 2% characterized by high hardness but lower ductility; used primarily for making tools and wear-resistant parts

Carbon steel with a carbon content between 0.25% and 0.6%, primarily used for manufacturing steel rails and machine parts