High-strength low-alloy (HSLA) steels are a group of carbon steels that contain small amounts of alloying elements, such as manganese, chromium, and nickel. These additions enhance the strength and toughness of the steel while maintaining good weldability and formability. HSLA steels are commonly used in structural applications, such as bridges and buildings, due to their ability to withstand heavy loads. The primary advantage of HSLA steels is their improved mechanical properties compared to conventional carbon steels. They offer higher yield and tensile strength, which allows for thinner sections in construction, reducing weight and material costs. This makes HSLA steels a popular choice in industries like automotive and construction.