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High-carbon steel (High Carbon Steel) often called tool steel, carbon content from 0.60 to 1.70%, can hardened and tempered. Hammers, crowbars, etc. by the carbon content of steel 0.75%; cutting tools such as drills, wire-tapping, reamers by the carbon content of steel from 0.90 to 1.00% of.

High-carbon steel in cold drawn after suitable heat treatment or hardening, high strength and hardness, high elastic limit and fatigue limit (especially notch fatigue limit), cutting is acceptable but the plastic deformation and cold welding performance poor. Due to the high carbon content, water quenching easy to crack, so the use of double quenching (water quenching + oil cooling), small cross-section parts to use more oil quenching. Such steel is generally quenched or quenched at the surface by tempering or normalizing. Mainly for the manufacture of springs and wear parts. Carbon tool steel is basically not adding alloying elements of high-carbon steel, tool steel is low cost and good hot and cold workability, using a wider range of steel grades. 0.65 a carbon content of 1.35%, is devoted to steel production tools. High carbon density of 7.81g / cm³.