Which is a major alloy in tool steel?

The major alloying element in tool steel is chromium. Chromium is widely used in the formulation of various tool steels because it enhances hardness, toughness, and wear resistance. The presence of chromium helps to form stable carbide structures within the steel, which significantly improves its cutting performance and provides resistance to deformation under high stresses.

Tool steels are designed specifically for machining and cutting applications, where the ability to withstand high temperatures and maintain sharp cutting edges is essential. The addition of chromium not only increases hardness but also improves the steel’s resistance to corrosion, allowing for better performance in demanding environments.

In contrast, while elements like cobalt, manganese, and elements in compounds such as FeN may enhance certain properties of steel, they are not as critical to the fundamental characteristics and performance of tool steel as chromium is. This distinction positions chromium as a key player in the alloy compositions that define the effectiveness and reliability of tool steels in industrial applications.