Structural steel is a type of steel that is used in construction to provide support and stability to buildings and other structures. It is a strong and durable material that is known for its high strength-to-weight ratio, which means it can support a significant load while being relatively lightweight. Structural steel is made of carbon steel, which is a type of steel that is composed primarily of iron and carbon, and is commonly used in construction because of its strength, ductility, and ease of fabrication.

Structural steel is used in a wide range of construction projects, including bridges, buildings, and industrial facilities. It is used for both load bearing and frame structures. The most common shapes for steel beams are I-beam and H-beam and are used for a variety of purposes such as for load bearing and for steel frame structures.

Structural steel is versatile, strong and durable, and it can be fabricated and erected quickly, which can make it a cost-effective choice for construction projects. It is also a sustainable material, as steel can be recycled, and its scrap can be used in the production of new steel.