High carbon steels have carbon percentage in the range of:

Steel is an alloy of iron and carbon, and the amount of carbon present significantly affects its properties. Carbon improves the hardness and strength of iron, but too much can reduce the metal's ductility and toughness. The amount of carbon in steel is categorized in four types:

Low Carbon Steel (Mild Steel): Contains 0.05% to 0.3% carbon. This is the most common type of steel due to its affordability and physical properties, which are ideal for many structural and body applications. It's relatively soft and hence easier to cut and shape. It's also highly ductile, meaning it can be stretched or otherwise deformed without breaking.

Medium Carbon Steel: Contains 0.3% to 0.6% carbon. This type of steel is strong and hard but still relatively easy to shape and cut, making it suitable for many automotive and construction applications.

High Carbon Steel: Contains 0.6% to 2.0% carbon. This type of steel is very hard and strong, but it's more brittle and less ductile than lower carbon steels. It's typically used for making high strength wires, springs, knives, and other tools that need to hold a sharp edge.

So, in summary, high carbon steels typically have a carbon percentage in the range of 0.6 - 2%. They are very hard, very strong steels that are primarily used in applications where extreme strength and hardness are needed.