High carbon steel is typically hard rather than soft. The high carbon content in the steel contributes to its hardness and strength. Carbon is a key element that affects the properties of steel, and a higher carbon content generally results in increased hardness.

When heat-treated properly, high carbon steel can achieve a high level of hardness, making it suitable for applications that require sharpness, durability, and resistance to wear. The hard nature of high carbon steel allows it to maintain a sharp edge and withstand heavy use without easily deforming or dulling.

It's important to note that the hardness of high carbon steel can vary depending on factors such as the specific steel grade, heat treatment process, and the desired application. Different heat treatment techniques, such as quenching and tempering, can be used to control the hardness of the steel within a desired range.

However, it's worth mentioning that high carbon steel can also be brittle if it is not properly heat-treated or if it undergoes excessive stress. Finding the right balance between hardness and toughness is crucial to prevent the steel from becoming too brittle and prone to chipping or breaking.

Overall, high carbon steel is known for its hardness and strength, making it a suitable choice for applications such as knives, swords, tools, and other cutting or impact-resistant tools.