1) For buildings
a) Structural sections: these provide a strong, stiff frame for the building and make up 25% of the steel use in buildings.
b) Reinforcing bars: these add tensile strength and stiffness to concrete and make up 44% of steel use in buildings. Steel is used because it binds well to concrete, has a similar thermal expansion coefficient and is strong and relatively cost-effective. Reinforced concrete is also used to provide deep foundations and basements and is currently the world’s primary building material.
c) Sheet products: 31% is in sheet products such as roofing, purlins, internal walls, ceilings, cladding, and insulating panels for exterior walls.
Internal fixtures and fittings such as rails, shelving and stairs are also made of steel.
c) Heavy Gauge Trussing System: Not only is steel affordable, readily available and safer, its intrinsic properties, such as strength, versatility, durability and 100% recyclability allow for improved environmental performance across the entire life cycle of buildings. Hence the choice for use as a trussing system in both residential, commercial & institutional buildings.