Tempered steel is a type of steel that has undergone a heat treatment process to improve its strength and toughness. This process involves heating the steel to a specific temperature and then cooling it rapidly, which alters its microstructure. The result is a material that is less brittle and more resistant to wear and deformation. This treatment is commonly used in various applications, including tools, knives, and automotive parts. By enhancing the properties of the steel, tempered steel can withstand higher stress and impact, making it a preferred choice in industries that require durable and reliable materials, such as construction and manufacturing.